Scaphopod

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Forner Valls Enric - One of the best experts on this subject based on the ideXlab platform.

  • Biodiversity of marine molluscs in the Millars river mouth
    Ateneu de Natura, 2014
    Co-Authors: Forner Valls Enric
    Abstract:

    S’analitza la biodiversitat de mol·luscs marins del litoral davant la desembocadura del riu Millars(Almassora i Borriana, Mediterrània occidental) obtinguda pel recompte d’espècies mitjançant mostresa la tanatocenosi de la platja de les Goles. S’han recollit 8 mostres amb un temps de 60 minuts derecol·lecció cadascuna. Les mostres es van recollir en el període que va del 22.oct.2012 al 08.oct.2013. Lariquesa d’espècies observada ha estat de 121 (77 Gastropoda; 40 Bivalvia; 2 Scaphopoda; 1 Cephalopodai 1 Polyplacophora). És el primer estudi similar fet a la Plana. Es postula una metodologia per censar lariquesa específica de mol·lusc marins mitjançant mostres a les tanatocenosis de platja.We Analyse the marine molluscs biodiversity of the coast of the Millars river mouth (Almassoraand Burriana, Spain, Western Mediterranean) obtained by counting species through sampling of thetanatocenosis from les Goles del Millars beach. 8 samples were made, each spanning 60 minutes. Thesamples were collected in the period from 22.oct.2012 to 08.oct.2013. Species richness reached 121 (77Gastropoda, 40 Bivalvia, 2 Scaphopoda, 1 Polyplacophora and 1 Cephalopoda). This is the first study ofthis kind in la Plana area. We propose a methodology to census the specific marine molluscs richnessthrough sampling of the tanatocenosis

  • Biodiversitat de mol·luscs marins a la desembocadura del riu Millars
    Ateneu de Natura (Castellò de la Plana), 2014
    Co-Authors: Forner Valls Enric
    Abstract:

    S'analitza la biodiversitat de mol·luscs marins del litoral davant la desembocadura del riu Millars (Almassora i Borriana, Mediterrània occidental) obtinguda pel recompte d'espècies mitjançant mostres a la tanatocenosi de la platja de les Goles. S'han recollit 8 mostres amb un lempo de 60 minuts de recol·lecció cadascuna. Le mostres es van recollir en el període qu va del 22.oct.2012 al 08.oct.2013. La riquesa d'espècies observada he estat de 121 (77 Gastropoda; 40 Bivalvia; 2 Scaphopoda; 1 Cephalopoda i 1 Polyplacophara). És el primer esludi similar fet a la Plana. Es postula una metodologia per censar la riquesa específica de mol·lusc marins mitjançant mostres a la tanatocenosis de platja.We Analyse the marine molluscs biodiversity of the coast of the Millars, river mouth (Almassora and Burriana, Spain, Western Mediterranean) obtained by counting specie through sampling of the tanatocenosis from les Goles del Millars beach. 8 samples were made, each spanning 60 minutes. The samples were collected in the period from 22.oct.2012 lo 08.oct.2013. Species richnees reached 121 (77 Gastropoda, 40 Bivalvia, 2 Scaphopoda, 1 Polyplacophora and 1 Cephalopoda). This is the first study of this kind in la Plana area. We propose a methodology to census the speclfic marine molIuscs richness through sampling of the tanatocenosis

  • Biodiversitat de mol·luscs marins a la desembocadura del riu Millars
    Ateneu de Natura, 2014
    Co-Authors: Forner Valls Enric
    Abstract:

    S’analitza la biodiversitat de mol·luscs marins del litoral davant la desembocadura del riu Millars(Almassora i Borriana, Mediterrània occidental) obtinguda pel recompte d’espècies mitjançant mostresa la tanatocenosi de la platja de les Goles. S’han recollit 8 mostres amb un temps de 60 minuts derecol·lecció cadascuna. Les mostres es van recollir en el període que va del 22.oct.2012 al 08.oct.2013. Lariquesa d’espècies observada ha estat de 121 (77 Gastropoda; 40 Bivalvia; 2 Scaphopoda; 1 Cephalopodai 1 Polyplacophora). És el primer estudi similar fet a la Plana. Es postula una metodologia per censar lariquesa específica de mol·lusc marins mitjançant mostres a les tanatocenosis de platja.Biodiversity of marine molluscs in the Millars river mouth.We Analyse the marine molluscs biodiversity of the coast of the Millars river mouth (Almassoraand Burriana, Spain, Western Mediterranean) obtained by counting species through sampling of thetanatocenosis from les Goles del Millars beach. 8 samples were made, each spanning 60 minutes. Thesamples were collected in the period from 22.oct.2012 to 08.oct.2013. Species richness reached 121 (77Gastropoda, 40 Bivalvia, 2 Scaphopoda, 1 Polyplacophora and 1 Cephalopoda). This is the first study ofthis kind in la Plana area. We propose a methodology to census the specific marine molluscs richnessthrough sampling of the tanatocenosis

Gerhard Steiner - One of the best experts on this subject based on the ideXlab platform.

  • complete mitochondrial genomes of two Scaphopod molluscs
    Mitochondrial DNA Part B, 2019
    Co-Authors: Kevin M Kocot, Gerhard Steiner, Tim Wollesen, Rebecca M Varney, Megan L Schwartz, Andreas Wanninger
    Abstract:

    Complete mitochondrial genomes were determined for two Scaphopod molluscs: the dentaliid Antalis entalis and an unidentified Antarctic gadilid. Both genomes are complete except, in Gadilida sp. ind...

  • the complete sequence and gene organization of the mitochondrial genome of the gadilid Scaphopod siphonondentalium lobatum mollusca
    Molecular Phylogenetics and Evolution, 2004
    Co-Authors: Hermann Dreyer, Gerhard Steiner
    Abstract:

    Comparisons of mitochondrial gene sequences and gene arrangements can be informative for reconstructing high-level phylogenetic relationships. We determined the complete sequence of the mitochondrial genome of Siphonodentalium lobatum, (Mollusca, Scaphopoda). With only 13,932 bases, it is the shortest molluscan mitochondrial genome reported so far. The genome contains the usual 13 protein-coding genes, two rRNA and 22 tRNA genes. The ATPase subunit 8 gene is exceptionally short. Several transfer RNAs show truncated TψC arms or DHU arms. The gene arrangement of S. lobatum is markedly different from all other known molluscan mitochondrial genomes and shows low similarity even to an unpublished gene order of a dentaliid Scaphopod. Phylogenetic analyses of all available complete molluscan mitochondrial genomes based on amino acid sequences of 11 protein-coding genes yield trees with low support for the basal branches. None of the traditionally accepted molluscan taxa and phylogenies are recovered in all analyses, except for the euthyneuran Gastropoda. S. lobatum appears as the sister taxon to two of the three bivalve species. We conclude that the deep molluscan phylogeny is probably beyond the resolution of mitochondrial protein sequences. Moreover, assessing the phylogenetic signal in gene order data requires a much larger taxon sample than is currently available, given the exceptional diversity of this character set in the Mollusca.

  • catalog of species group names of recent and fossil Scaphopoda mollusca
    Zoosystema, 2004
    Co-Authors: Gerhard Steiner, Alan R. Kabat
    Abstract:

    Ce catalogue contient les noms des taxons recents et fossiles du groupe-espece des mollusques de la classe des Scaphopoda. Sur un total de 1965 entrees, 517 concernent des taxons valides recents, 816 des taxons valides fossiles, 543 sont des noms invalides et 89 ont ete subsequemment exclus des Scaphopoda. L'autorite et les references bibliographiques completes sont indiquees pour chaque nom. L'allocation generique originale et actuelle, la localite type et le lieu de depot du materiel type sont indiques autant que possible. Pour les taxons recents, les synonymes, distributions geographique et bathymetrique sont indiques. Les references croisees avec les synonymes plus recents sont basees sur les opinions publiees. Huit especes sont nouvellement synonymisees dans ce travail : Dentalium tessellatum synonyme plus recent de Entalinopsis habutae ; Dentalium caudani synonyme plus recent de Fissidentalium candidum ; F. ergasticum, F. milneedwardsi et F. scamnatum synonymes plus recents de F. capillosum ; F. exuberans synonyme plus recent de F. paucicostatum ; et Cadulus halius synonyme plus recent de C. podagrinus. Trois taxons subspecifiques sont mis en synonymie avec les especes nominales correspondantes : Antalis cerata tenax, Polyschides rushii arne et Gadila agassizii hatterasensis. De plus, huit nouvelles combinaisons generiques sont proposees : Paradentalium americanum n. comb., Coccodentalium cancellatum n. comb., Fissidentalium peruvianum n. comb., Pulsellum teres n. comb., Polyschides poculum n. comb., Polyschides foweyensis n. comb., Polyschides portoricensis n. comb. et Polyschides nitidus n. comb. Treize homonymes plus recents sont renommes et listes en annexe 1.

  • molecular phylogeny of Scaphopoda mollusca inferred from 18s rdna sequences support for a Scaphopoda cephalopoda clade
    Zoologica Scripta, 2003
    Co-Authors: Gerhard Steiner, Hermann Dreyer
    Abstract:

    The phylogenetic relationships of the Scaphopoda, one of the ‘lesser’ molluscan classes, with the other conchiferan taxa are far from clear. They appear either as the sister-group to the Bivalvia (Diasoma concept) or to a Gastropoda–Cephalopoda clade or to the Cephalopoda alone (helcionellid concept). We compiled a 18S rDNA sequence dataset of 48 molluscan species containing 17 Scaphopods to test these hypotheses and to address questions regarding high-level relationships with the Scaphopoda. Both parsimony and maximum likelihood trees show low branch support at the base of the Conchifera, except for the robust clade uniting Scaphopoda and Cephalopoda. This result is corroborated by spectral analysis and likelihood mapping. We also tested alternative topologies which scored significantly worse both in tree length and in likelihood. The 18S rDNA data thus reject the Diasoma in favour of a Scaphopoda–Cephalopoda clade as proposed in the helcionellid concept. When plotted on the molecular tree, the pivotal morphological characters associated with the burrowing life style of the Bivalvia and Scaphopoda, i.e. mantle/shell enclosure of the body and the burrowing foot with true pedal ganglia, appear convergent in these groups. In contrast, the prominent and tilted dorsoventral body axes, multiple cephalic tentacles and a ring-shaped muscle attachment on the shell are potential synapomorphies of Scaphopoda and Cephalopoda. Most of the higher taxa within the Scaphopoda are supported by the molecular data. However, there is no support for the families Dentaliidae and Gadilidae. The basal position of the Fustiariidae within the Dentaliida is confirmed.

Francesca Griggio - One of the best experts on this subject based on the ideXlab platform.

  • Hypervariability of Ascidian Mitochondrial Gene Order: Exposing the Myth of Deuterostome Organelle Genome Stability
    Molecular biology and evolution, 2009
    Co-Authors: Carmela Gissi, Graziano Pesole, Fabio Iannelli, Francesco Mastrototaro, Vanessa Guida, Francesca Griggio
    Abstract:

    The few sequenced mitochondrial (mt) genomes of the class Ascidiacea (Chordata, Tunicata), mostly belonging to congeneric species of the Phlebobranchia order, show extraordinary gene order rearrangements. In order to assess if this hypervariability in gene order is a general feature of Ascidiacea, we report here the gene arrangement of five ascidians belonging to the Aplousobranchia and Stolidobranchia orders. Our data show that Ascidiacea are characterized by: 1) extensive gene order rearrangements both within and between the three major lineages; 2) lack of significant similarities to the gene order of other deuterostomes; and 3) an extent of rearrangements comparable with that of Mollusca (especially the Gastropoda, Bivalvia, and Scaphopoda classes), a phylum with highly rearranged mtDNAs. The only conserved feature is the location of all genes on the same strand, which suggests that selective constraints are related to the mt transcription. Finally, a higher mobility of the tRNA genes is undetectable because of saturation effect, and only the partially conserved cox2-cob gene block seems to retain some phylogenetic signals.

Oscar Galvez - One of the best experts on this subject based on the ideXlab platform.

Cecilia Osorio - One of the best experts on this subject based on the ideXlab platform.

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