Sabellidae

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Adriana Giangrande - One of the best experts on this subject based on the ideXlab platform.

  • Addition to the knowledge on Acromegalomma messapicum (Giangrande & Licciano, 2008) (Annelida: Sabellidae)
    The European Zoological Journal, 2018
    Co-Authors: Adriana Giangrande, E. Mancini, F. Tiralongo, Margherita Licciano
    Abstract:

    AbstractThe genus Acromegalomma has been recently introduced as nomen novum for the polychaete genus Megalomma. Recently specimens of A. messapicum were collected from the coastal area of Civitavec...

  • heavy metals in five Sabellidae species annelida polychaeta ecological implications
    Environmental Science and Pollution Research, 2017
    Co-Authors: Adriana Giangrande, Margherita Licciano, Michela Del Pasqua, Francesco P Fanizzi, Danilo Migoni, Loredana Stabili
    Abstract:

    The present work analyzed three hard-bottom and two soft-bottom species of sabellid polychaetes to determine the content of several heavy metals in their branchial crown and body. The highest concentrations of heavy metals were recorded in the hard-bottom species Branchiomma bairdi, a recent Mediterranean introduction. Differences in the metal concentrations were most notable in the high trace metal levels of the branchial crown for all the studied species. Statistical analysis showed that the Mediterranean hard-bottom species were similar each other in their heavy metal content in the body as well as in the branchial crown and appeared separated from all the other species. Arsenic and vanadium hyperaccumulation in the branchial crowns of the considered sabellid species probably acts as a deterrent for predation. The observed differences among the examined species were discussed not only at the light of habitat colonization but also in terms of the phylogeny.

  • Variability among Mediterranean populations of Sabella pavonina (Annelida: Sabellidae)
    Italian Journal of Zoology, 2014
    Co-Authors: Adriana Giangrande, L. P. G. Caruso, Luigi Musco, Margherita Licciano
    Abstract:

    AbstractSabella pavonina Savigny, 1920 is a species common to sheltered areas of northwest Europe and reported also in several Mediterranean sites. However, most Mediterranean records refer to faunistic lists with only few papers reporting morphological descriptions supported by drawings or photographs, most of which are short and out-dated. Moreover, no analysis of intraspecific variations among Mediterranean populations is available. In the present paper we provide the descriptions of individuals identified as S. pavonina belonging to four different Mediterranean populations and deposited at the Laboratory of Zoology of the Salento University. We analyzed the species morphological variation within the Mediterranean area compared to the deposited neotype and some other specimens collected from the type locality (Plymouth) and from Portsmouth (English Channel). The examined specimens from the four Mediterranean localities all differ from the English Channel Plymouth specimens with respect to a higher crow...

  • Sabellidae and Fabriciidae (Polychaeta) of the Adriatic Sea with particular retrospect to the Northern Adriatic and the description of two new species
    Journal of the Marine Biological Association of the United Kingdom, 2013
    Co-Authors: Barbara Mikac, Adriana Giangrande, Margherita Licciano
    Abstract:

    Sabellidae is the second most diverse polychaete family in the Adriatic Sea, after Syllidae. Herein we report the updated list of the Sabellidae and Fabriciidae families in the Adriatic Sea deriving both from literature data and presently conducted researches in the northern Adriatic. During these researches polychaetes were sampled from three offshore soft-bottom and three coastal rocky shore stations. Among the analysed material three Sabellidae species are new records for the Adriatic fauna, while four Sabellidae and one Fabriciidae species were recorded for the first time in the northern part. Two new species were found and described: Amphicorina rovignensis spec. nov. and Megalomma pseudogesae spec. nov. These findings increase the number of Sabellidae taxa recorded in the northern Adriatic from 29 to 38. Our results point out the lack of the recent taxonomic studies in the area, but might also indicate the widening of the species areal. Taking into consideration that studies on only six stations raised the number of known sabellid taxa from the area by 31%, our results support the need for the regular taxonomic updating of the polychaete fauna in the northern Adriatic.

  • notes on the species of perkinsiana polychaeta Sabellidae from antarctica with the description of p brigittae sp nov
    Zootaxa, 2012
    Co-Authors: Maria Ana Tovarhernandez, Adriana Giangrande, Beatriz Yanezrivera, Maria Cristina Gambi
    Abstract:

    Nine nominal species are known from Antarctica and adjacent waters that have been assigned to the genus Perkinsiana (Polychaeta: Sabellidae). Taxonomic notes for these species are provided. Currently, only six species are considered valid: Perkinsiana antarctica (Kinberg), P. decorata (Rullier), P. borsibrunoi Giangrande and Gambi, P. magalhaensis (Kinberg), P. milae Giangrande and Gambi and P. pusilla (Johansson); P. antarctica (Gravier) is incertae sedis; P. littoralis (Hartman) is a suggested synonym of P. magalhaensis (Kinberg) and P. antarctica (Gravier), while Potamilla antarctica christenseni Augener probably belongs to the genus Notaulax. Perkinsiana is amended based on the presence of a palmate membrane and radiolar flanges, and three types of abdominal chaetae. The new species Perkinsiana brigittae sp. nov. is here described from collections taken by the U. S. Antarctic Research Program (USARP) at Wilkes Station. A taxonomic key for species of Perkinsiana from Antarctica is provided.

Greg W. Rouse - One of the best experts on this subject based on the ideXlab platform.

  • two new species of terebrasabella annelida Sabellidae sabellinae from australia
    Zootaxa, 2007
    Co-Authors: Anna Murray, Greg W. Rouse
    Abstract:

    Two new species of Terebrasabella Fitzhugh & Rouse, 1999 are described from eastern Australia. Terebrasabella hutchingsae sp. nov. , was found from preserved coral rock debris collected in 1977 on the outer Barrier Reef near Lizard Island, Queensland. Terebrasabella fitzhughi sp. nov. , was found alive in burrows in and among spirorbin serpulid tubes on intertidal rocks in Tasmania in 1996. Both species were found in mucoid tubes, and brood their young in a manner similar to the only other described species of Terebrasabella , T. heterouncinata Fitzhugh & Rouse, 1999. Terebrasabella hutchingsae sp. nov. , is exceptional as it possesses a type of thoracic neurochaetal uncinus different from the other two species, and which is similar to the notochaetal acicular “palmate hook” seen in Caobangia . Descriptions of both species are given, and the diagnosis for Terebrasabella is emended. Larval and chaetal morphology and relationships among of the three known Terebrasabella spp. are discussed.

  • Ultrastructure of spermiogenesis, sperm, and the spermatheca in Terebrasabella heterouncinata (Polychaeta: Sabellidae: Sabellinae)
    Invertebrate Biology, 2005
    Co-Authors: Carol A. Simon, Greg W. Rouse
    Abstract:

    . The sabellid polychaete, Terebrasabella heterouncinata, forms burrows in gastropod shells. It is a small, intratubular brooder that breeds semi-continuously. It has been shown to self-fertilize, but its reproductive biology suggests that some form of sperm transfer must occur between individuals. To gain an understanding of its fertilization biology, the ultrastructure of spermiogenesis and the sperm in T. heterouncinata was described, and the animal examined for sperm storage structures. Spermiogenesis occurs in clusters of eight spermatids. The mature sperm has an elongate nucleus and a bilaterally symmetrical acrosome with twisted subacrosomal spaces. The midpiece is short, with three crescent-shaped mitochondria, and forms a tight sheath around the axoneme. A single spermatheca, which opens on the inner ventral part of the crown near the buccal region, is present. It is a simple blind-ending duct that runs below the ventral nerve cord and is longer than 100 μm. This is the first record of a single spermatheca in Sabellidae. The shape of the sperm and the presence of a spermatheca confirm that individuals of T. heterouncinata produce ent-aquasperm and would normally cross-fertilize.

  • evolution of reproductive features and larval development in the genus amphiglena polychaeta Sabellidae
    Marine Biology, 1998
    Co-Authors: Greg W. Rouse, Maria Cristina Gambi
    Abstract:

    Larval development in Amphiglena mediterranea is direct in the parental tube, and larvae crawl away as young juveniles with a radiolar crown capable of feeding. The non-feeding larvae of A. nathae are initially brooded in the parental tube, and then have a swimming phase before settling and developing a radiolar crown. Developmental data and reproductive features such as sperm structure are combined with other morphological data for an assessment of the cladistic relationships of the species in the genus Amphiglena. Two species of Laonome are included as part of the ingroup. Six genera, representing a sister group to the Laonome/Amphiglena clade, are used as an outgroup. Two most-parsimonious cladograms were found, and the evolution of reproductive features are discussed. The monophyly of Amphiglena is indicated by features previously identified, as well as two features based on sperm morphology. At present a plesiomorphic larval form cannot be identified for the genus Amphiglena.

  • sperm ultrastructure and spermathecal structure in amphiglena spp polychaeta Sabellidae
    Invertebrate Biology, 1998
    Co-Authors: Greg W. Rouse, Cristina M Gambi
    Abstract:

    The ultrastructure of spermiogenesis and sperm in four species of Amphiglena is described: A. lindae, A. mediterranea, A. nathae, and A. pacifica. All are simultaneous hermaphrodites with oocytes and developing sperm present in abdominal chaetigers. Spermiogenesis occurs in large, synchronously developing masses connected to a cytophore in all four species, and is similar to that previously described for A. terebro. Sperm have an elongate nucleus and long midpiece. The acrosome and nucleus spiral around each other at the tip of the sperm. There are clear differences between the species in the structure of the mature sperm. The spermathecae of A. terebro are sac-like structures, with a simpler morphology than those found in other Amphiglena spp. The spermathecae of A. pacifica are like those of A. lindae, A. mediterranea, and A. nathae in being narrow, convoluted ducts. Based on previously published analyses, the elongate sperm heads and presence of spermathecae found in Amphiglena appear to have evolved independently from the similar condition seen in plesiomorphic sabellins such as Amphicorina. Further information on other apomorphic sabellins that brood larvae, such as Potamilla, is required to determine if the unusual sperm morphology and spermathecae in Amphiglena represent synapomorphies for members of the genus. Additional key words: reproduction, brooding, fertilization There are currently five accepted species of Amphiglena: A. lindae ROUSE & GAMBI 1997, A. mediterranea (LEYDIG 1851), A. nathae ROUSE 1994, A. pacifica ANNENKOVA 1934, and A. terebro ROUSE 1993. Amphiglena marita CHLEBOVITSCH 1959 was recently made a synonym of A. pacifica by Rzhavsky (1995). All of these species are known to be intratubular brooders of larvae, except A. lindae, whose larvae have yet to be described. The presence of spermathecae in A. lindae does suggest that its reproductive mechanism is similar to that of other Amphiglena species (Rouse & Gambi 1997). A cladistic analysis of the Sabellidae by Rouse & Fitzhugh (1994) found the genus Amphiglena to be a derived member of the subfamily Sabellinae. This result suggested that Amphiglena is the most derived member of the Sabellidae to brood larvae and that this phenomenon has evolved from ancestors with broadcast-spawning. Elucidating the evolution of this brooding mechanism, which is apparently independent of the plesiomorphic brooding condition in the Sabellidae (Rouse & Fitzhugh 1994), a Author for correspondence. E-mail: gregr@bio.usyd.edu.au requires knowledge of reproduction in as many species of Amphiglena as possible. In this study, spermiogenesis and sperm ultrastructure is described in four species of Amphiglena: A. lindae, A. mediterranea, A. nathae, and A. pacifica. The spermathecae of A. pacifica and A. terebro are also described for the first time. This information will be used to provide additional characters for further analysis of the evolution of reproduction in Amphiglena (Rouse & Gambi, in press).

  • Variability of sperm storage by females in the Sabellidae and Serpulidae (Polychaeta, Sabellida)
    Zoomorphology, 1996
    Co-Authors: Greg W. Rouse
    Abstract:

    The Sabellidae is comprised of the Sabellinae and Fabriciinae. Reproduction in the Sabellinae varies considerably, while the Fabriciinae show a uniform sexual reproductive mode. Adult females of all Fabriciinae studied to date brood directly developing larvae within their tubes and the presence of spermathecae has previously been noted in several species. Interestingly, spermathecae have not been found in a number of other Fabriciinae. In this paper, the sperm-storage mechanisms of species in the genera (all Fabriciinae) Augeneriella, Fabricinuda, Novafabricia, Pseudofabriciola, Fabriciola and an, as yet, undescribed genus are detailed. Novafabricia tenuiseta has complex prostomial spermathecae, similar to those previously described for Fabricia stellaris and Parafabricia ventricingulata. Augeneriella alata has simple sac-like spermathecae in the peristomium. Females in the remaining species were found to have no specialised organs for sperm storage. Instead, they store spermatozoa in epidermal cells below the dorsal lips of the radiolar crown or in cells lining the buccal cavity. The paired spermathecae in Salmacina sp. (Serpulidae) are also described. This represents the first description of spermathecae in a serpulid, apart from those described in members of the Spirorbinae. This is done in part to facilitate polarity decisions for characters based on the reproductive system used in a forthcoming cladistic analysis of the Fabriciinae. The use of characters based on the reproductive system may help resolve some problems with the systematics of this clade. At present, the uncertainty of relationships amongst various clades of the Fabriciinae prevents any understanding of the evolution of reproductive methods in the group

Maria Cristina Gambi - One of the best experts on this subject based on the ideXlab platform.

  • arsenic speciation and susceptibility to oxidative stress in the fanworm sabella spallanzanii gmelin annelida Sabellidae under naturally acidified conditions an in situ transplant experiment in a mediterranean co2 vent system
    Science of The Total Environment, 2016
    Co-Authors: Elena Ricevuto, Ilaria Lanzoni, Daniele Fattorini, Francesco Regoli, Maria Cristina Gambi
    Abstract:

    Abstract The fanworm Sabella spallanzanii (Gmelin, 1791) (Annelida, Sabellidae) is considered tolerant to several types of stressors but is generally absent from the CO 2 vents. A peculiar characteristic of this species is the elevated content of arsenic in the gills, particularly dimethylarsinic acid (DMA), stored as an anti-predatory compound. In this study, modulation of trace metal levels, chemical speciation of arsenic and oxidative stress biomarkers were quantified in S. spallanzanii after a 30 days transplant experiment into naturally acidified conditions in a Mediterranean vent system. No significant bioaccumulation of metals was observed in the thoracic tissues and branchial crowns after the translocation period, whereas variations occurred in the relative abundance of different arsenic compounds with the appearance of inorganic forms. The antioxidant system of translocated polychaetes exhibited a significant decrease of enzymatic activities of both catalase and glutathione peroxidases, and the impairment of the overall capability to neutralize hydroxyl radicals ( OH). This highlighted an oxidative challenge primarily on the detoxification pathway of hydrogen peroxide. Overall low pH-elevated p CO 2 may have detrimental effects on arsenic metabolism and oxidative status of S. spallanzanii , supporting the hypothesis of species-specific differences in vulnerability to ocean acidification.

  • notes on the species of perkinsiana polychaeta Sabellidae from antarctica with the description of p brigittae sp nov
    Zootaxa, 2012
    Co-Authors: Maria Ana Tovarhernandez, Adriana Giangrande, Beatriz Yanezrivera, Maria Cristina Gambi
    Abstract:

    Nine nominal species are known from Antarctica and adjacent waters that have been assigned to the genus Perkinsiana (Polychaeta: Sabellidae). Taxonomic notes for these species are provided. Currently, only six species are considered valid: Perkinsiana antarctica (Kinberg), P. decorata (Rullier), P. borsibrunoi Giangrande and Gambi, P. magalhaensis (Kinberg), P. milae Giangrande and Gambi and P. pusilla (Johansson); P. antarctica (Gravier) is incertae sedis; P. littoralis (Hartman) is a suggested synonym of P. magalhaensis (Kinberg) and P. antarctica (Gravier), while Potamilla antarctica christenseni Augener probably belongs to the genus Notaulax. Perkinsiana is amended based on the presence of a palmate membrane and radiolar flanges, and three types of abdominal chaetae. The new species Perkinsiana brigittae sp. nov. is here described from collections taken by the U. S. Antarctic Research Program (USARP) at Wilkes Station. A taxonomic key for species of Perkinsiana from Antarctica is provided.

  • a new genus of Sabellidae annelida polychaeta from antarctica with discussion of relationships among plesiomorphic genera within sabellinae
    Zootaxa, 2009
    Co-Authors: Margherita Licciano, Adriana Giangrande, Maria Cristina Gambi
    Abstract:

    A new genus of Sabellidae (Annelida, Polychaeta), collected in the soft bottoms off the Antarctic Peninsula (Antarctica) in January 2006 is described. The new genus Euchoneira is included in the most plesiomorphic area in the sub-family Sabellinae. Similar to the genus Euchone, this new taxon presents a well developed anal depression with lateral wings, but the shape of abdominal uncini resembles that of Jasmineira. The new species Euchoneira knoxi gen. sp. nov., very abundant in the investigated area, is a gonochoric form (sex-ratio close 1:1). Females contained eggs ranging from 100 to 250 µm in diameter (modal class 175 µm) either in the abdomen or thorax. Males with mature sperm had spermatozoa with a characteristic cylindrical shape of the nucleus with a pointed, “nip-like” acrosome, a morphology similar to that already observed in Euchone pallida Ehlers, 1908, a second species collected together with the new taxon and already known for the Antarctic area. Additions to the description of E. pallida concerning internal structure of the crown, is also given. To define the relationships between the newly described genus and the genera present in the plesiomorphic area of the Sabellinae subfamily, a cladistic analysis was performed utilizing a previous data set after adding the new taxon. The consensus tree confirmed Amphicorina armandi (Claparede, 1868) as the most plesiomorphic taxon separated from all the others. The new genus is located in an intermediate position between Jasmineira - Claviramus and the clade containing Chone and Euchone species, close to Fabrisabella vasculosa.

  • a collection of Sabellidae polychaeta from carrie bow cay belize western caribbean sea with the description of two new species
    Zootaxa, 2007
    Co-Authors: Adriana Giangrande, Margherita Licciano, Maria Cristina Gambi
    Abstract:

    In the framework of a research on taxonomy and ecology of selected families of polychaetes conducted at the field station of the Smithsonian Institution (Washington DC, USA) at Carrie Bow Cay (Belize, Western Caribbean Sea) on November 2005, several qualitative benthic samples from different habitats and substrate types (Thalassia testudinum shoots, fragments of dead hard corals, sponges) have been analyzed. In some of these samples, specimens of Sabellidae were found, revealing, together with some taxa already known for the area, the presence of two new species, Megalomma fauchaldi sp. nov., and Pseudoaugeneriella spongicola sp. nov., this latter representing a genus newly reported from the Caribbean. Sabellidae biodiversity and systematics between Caribbean and Mediterranean regions is also compared.

  • reproduction and simultaneous hermaphroditism in branchiomma luctuosum polychaeta Sabellidae from the mediterranean sea
    Invertebrate Biology, 2005
    Co-Authors: Margherita Licciano, Adriana Giangrande, Maria Cristina Gambi
    Abstract:

    Abstract. Previous observations on the reproductive biology and gametogenesis of Branchiomma luctuosum (Polychaeta: Sabellidae) were extended in this study, with a description of larval development and of reproduction at the population level, comparing populations from the Tyrrhenian Sea (Ischia, Naples) and Ionian Sea (Gulf of Taranto). Although B. luctuosum is a simultaneous hermaphrodite, producing both male and female gametes in each fertile segment, present observations seem to preclude self-fertilization. Both gametes were spawned under laboratory conditions, and broadcasting was confirmed by sperm structure, which appears adapted for external fertilization. Larval development revealed the shortest pelagic period known for sabellids of similar size and life history. Oogenesis was prolonged and extraovarian. The Ionian population seemed to have a resting period during which eggs, having already begun vitello-genesis, remained at a diameter of about 30 μm. After this period, rapid growth was observed: the oocytes reached maximum diameter (140 μm) in about 2 months. The spawning period began earlier and lasted longer in the Ionian population, compared to the Tyrrhenian population. This pattern seems to be due to asynchronous vitellogenesis within individuals. Documenting the reproductive features of this species will help us to understand its role as a primary colonizer, since hermaphroditism and a short pelagic phase may produce high population densities starting from only a few individuals.

Margherita Licciano - One of the best experts on this subject based on the ideXlab platform.

  • Addition to the knowledge on Acromegalomma messapicum (Giangrande & Licciano, 2008) (Annelida: Sabellidae)
    The European Zoological Journal, 2018
    Co-Authors: Adriana Giangrande, E. Mancini, F. Tiralongo, Margherita Licciano
    Abstract:

    AbstractThe genus Acromegalomma has been recently introduced as nomen novum for the polychaete genus Megalomma. Recently specimens of A. messapicum were collected from the coastal area of Civitavec...

  • heavy metals in five Sabellidae species annelida polychaeta ecological implications
    Environmental Science and Pollution Research, 2017
    Co-Authors: Adriana Giangrande, Margherita Licciano, Michela Del Pasqua, Francesco P Fanizzi, Danilo Migoni, Loredana Stabili
    Abstract:

    The present work analyzed three hard-bottom and two soft-bottom species of sabellid polychaetes to determine the content of several heavy metals in their branchial crown and body. The highest concentrations of heavy metals were recorded in the hard-bottom species Branchiomma bairdi, a recent Mediterranean introduction. Differences in the metal concentrations were most notable in the high trace metal levels of the branchial crown for all the studied species. Statistical analysis showed that the Mediterranean hard-bottom species were similar each other in their heavy metal content in the body as well as in the branchial crown and appeared separated from all the other species. Arsenic and vanadium hyperaccumulation in the branchial crowns of the considered sabellid species probably acts as a deterrent for predation. The observed differences among the examined species were discussed not only at the light of habitat colonization but also in terms of the phylogeny.

  • Variability among Mediterranean populations of Sabella pavonina (Annelida: Sabellidae)
    Italian Journal of Zoology, 2014
    Co-Authors: Adriana Giangrande, L. P. G. Caruso, Luigi Musco, Margherita Licciano
    Abstract:

    AbstractSabella pavonina Savigny, 1920 is a species common to sheltered areas of northwest Europe and reported also in several Mediterranean sites. However, most Mediterranean records refer to faunistic lists with only few papers reporting morphological descriptions supported by drawings or photographs, most of which are short and out-dated. Moreover, no analysis of intraspecific variations among Mediterranean populations is available. In the present paper we provide the descriptions of individuals identified as S. pavonina belonging to four different Mediterranean populations and deposited at the Laboratory of Zoology of the Salento University. We analyzed the species morphological variation within the Mediterranean area compared to the deposited neotype and some other specimens collected from the type locality (Plymouth) and from Portsmouth (English Channel). The examined specimens from the four Mediterranean localities all differ from the English Channel Plymouth specimens with respect to a higher crow...

  • Sabellidae and Fabriciidae (Polychaeta) of the Adriatic Sea with particular retrospect to the Northern Adriatic and the description of two new species
    Journal of the Marine Biological Association of the United Kingdom, 2013
    Co-Authors: Barbara Mikac, Adriana Giangrande, Margherita Licciano
    Abstract:

    Sabellidae is the second most diverse polychaete family in the Adriatic Sea, after Syllidae. Herein we report the updated list of the Sabellidae and Fabriciidae families in the Adriatic Sea deriving both from literature data and presently conducted researches in the northern Adriatic. During these researches polychaetes were sampled from three offshore soft-bottom and three coastal rocky shore stations. Among the analysed material three Sabellidae species are new records for the Adriatic fauna, while four Sabellidae and one Fabriciidae species were recorded for the first time in the northern part. Two new species were found and described: Amphicorina rovignensis spec. nov. and Megalomma pseudogesae spec. nov. These findings increase the number of Sabellidae taxa recorded in the northern Adriatic from 29 to 38. Our results point out the lack of the recent taxonomic studies in the area, but might also indicate the widening of the species areal. Taking into consideration that studies on only six stations raised the number of known sabellid taxa from the area by 31%, our results support the need for the regular taxonomic updating of the polychaete fauna in the northern Adriatic.

  • a new genus of Sabellidae annelida polychaeta from antarctica with discussion of relationships among plesiomorphic genera within sabellinae
    Zootaxa, 2009
    Co-Authors: Margherita Licciano, Adriana Giangrande, Maria Cristina Gambi
    Abstract:

    A new genus of Sabellidae (Annelida, Polychaeta), collected in the soft bottoms off the Antarctic Peninsula (Antarctica) in January 2006 is described. The new genus Euchoneira is included in the most plesiomorphic area in the sub-family Sabellinae. Similar to the genus Euchone, this new taxon presents a well developed anal depression with lateral wings, but the shape of abdominal uncini resembles that of Jasmineira. The new species Euchoneira knoxi gen. sp. nov., very abundant in the investigated area, is a gonochoric form (sex-ratio close 1:1). Females contained eggs ranging from 100 to 250 µm in diameter (modal class 175 µm) either in the abdomen or thorax. Males with mature sperm had spermatozoa with a characteristic cylindrical shape of the nucleus with a pointed, “nip-like” acrosome, a morphology similar to that already observed in Euchone pallida Ehlers, 1908, a second species collected together with the new taxon and already known for the Antarctic area. Additions to the description of E. pallida concerning internal structure of the crown, is also given. To define the relationships between the newly described genus and the genera present in the plesiomorphic area of the Sabellinae subfamily, a cladistic analysis was performed utilizing a previous data set after adding the new taxon. The consensus tree confirmed Amphicorina armandi (Claparede, 1868) as the most plesiomorphic taxon separated from all the others. The new genus is located in an intermediate position between Jasmineira - Claviramus and the clade containing Chone and Euchone species, close to Fabrisabella vasculosa.

Maria Ana Tovarhernandez - One of the best experts on this subject based on the ideXlab platform.

  • the social feather duster worm bispira brunnea polychaeta Sabellidae aggregations morphology and reproduction
    Marine Biology Research, 2017
    Co-Authors: Yasmin Davilajimenez, Maria Ana Tovarhernandez, Nuno Simōes
    Abstract:

    ABSTRACTThe fan worm Bispira brunnea is one of the most attractive sabellid polychaetes from Caribbean coral reef areas and it is exploited for ornamental purposes. An understanding of the structure of its aggregations, morphology and reproductive biology will provide information required to facilitate artificial propagation of this species. Ten aggregations were collected in October 2013, February and March 2014 in the Majahual reef lagoon, Mexican Caribbean. Whole aggregations were examined under light microscopy and scanning electron microscopy and the histology of oogenesis was determined. Aggregations were composed of 24–56 individuals and included juveniles and adults. The adults (5–20 mm) did not display any noticeable form of sexual dimorphism. In B. brunnea both sexual (hermaphroditism or gonochorism) and asexual reproduction occurred at the same time within the population: 92.71% reproduced sexually and 52% by architomy. The buds produced by architomy were inside the parental tube, at three rege...

  • notes on the species of perkinsiana polychaeta Sabellidae from antarctica with the description of p brigittae sp nov
    Zootaxa, 2012
    Co-Authors: Maria Ana Tovarhernandez, Adriana Giangrande, Beatriz Yanezrivera, Maria Cristina Gambi
    Abstract:

    Nine nominal species are known from Antarctica and adjacent waters that have been assigned to the genus Perkinsiana (Polychaeta: Sabellidae). Taxonomic notes for these species are provided. Currently, only six species are considered valid: Perkinsiana antarctica (Kinberg), P. decorata (Rullier), P. borsibrunoi Giangrande and Gambi, P. magalhaensis (Kinberg), P. milae Giangrande and Gambi and P. pusilla (Johansson); P. antarctica (Gravier) is incertae sedis; P. littoralis (Hartman) is a suggested synonym of P. magalhaensis (Kinberg) and P. antarctica (Gravier), while Potamilla antarctica christenseni Augener probably belongs to the genus Notaulax. Perkinsiana is amended based on the presence of a palmate membrane and radiolar flanges, and three types of abdominal chaetae. The new species Perkinsiana brigittae sp. nov. is here described from collections taken by the U. S. Antarctic Research Program (USARP) at Wilkes Station. A taxonomic key for species of Perkinsiana from Antarctica is provided.

  • reproduction of the invasive fan worm branchiomma bairdi polychaeta Sabellidae
    Marine Biology Research, 2011
    Co-Authors: Maria Ana Tovarhernandez, Beatriz Yanezrivera, Jose Luis Bortolinirosales
    Abstract:

    Abstract The fan worm Branchiomma bairdi has been introduced to the Gulf of California from its original distribution in the Caribbean Sea, and is now a conspicuous component of most benthic communities. Study of reproductive features is essential to understand the dispersion capability of B. bairdi and its invasive potential. Sampling was carried out monthly in the port of Mazatlan during 2009 (23°12′13′′N, 106°24′31.4′′W). Abundance and biomass were measured. Sex and maturity were determined. Gametogenesis and observations on the spawning, fertilization, larval development and brooding are presented. The highest values of abundance (>2500 worms m−2) and biomass (175 g m−2) occurred during August and September. Mature simultaneous hermaphrodite worms were found continuously throughout the annual cycle as well as asexual forms. In B. bairdi gametogenesis is extra-ovarian. Three posterior thoracic segments and all abdominal segments are involved in the production of gametes. Sperm are ect-aquasperm type (f...

  • four new species of fan worms polychaeta Sabellidae from worldwide localities
    Scientia Marina, 2010
    Co-Authors: Maria Ana Tovarhernandez, Harlan K Dean
    Abstract:

    Four new species of soft-bottom sabellid polychaetes are described and illustrated. Branchiomma costaricensis n. sp. is described from 31 m depth off Isla del Coco, Costa Rica; Dialychone arabica n. sp. from 105 m depth in the Arabian Sea; Dialychone blakei n. sp. from 487 m depth off Louisiana in the Gulf of Mexico and Paradialychone harrisae n. sp. from 30 m depth in southern California. Branchiomma costaricensis n. sp. is characterized by having microstylodes with the median pair 1.5 times longer than neighbouring pairs, thoracic uncini with two rows of teeth above the main fang, an unspotted body and large interramal eyespots. Dialychone arabica n. sp. has the anterior peristomial ring lobe exposed beyond the collar and a pre-pygidial depression occupying eight segments. In D. blakei n. sp., the anterior peristomial ring lobe is not exposed beyond the collar, the pre-pygidial depression occupies the last four segments and the posterior segments possess thin elongate, narrowly hooded chaetae. Paradialychone harrisae n. sp. differs from the other species of the genus in having the anterior peristomial ring lobe bilobed and exposed beyond the collar, a rectangular ventral collar shield and paleate chaetae with a long mucro.

  • parasabella bush 1905 replacement name for the polychaete genus demonax kinberg 1867 annelida polychaeta Sabellidae
    ZooKeys, 2010
    Co-Authors: Maria Ana Tovarhernandez, Leslie H Harris
    Abstract:

    : Parasabella Bush, 1905 is reintroduced as a replacement name for Demonax Kinberg, 1867 (Annelida: Polychaeta: Sabellidae) which is a junior homonym of Demonax Thomson, 1860 (Insecta: Coleoptera: Cerambycidae).