The Experts below are selected from a list of 156 Experts worldwide ranked by ideXlab platform
Huanyu Liao - One of the best experts on this subject based on the ideXlab platform.
-
discovery of pemphilimnadiopsis cheni branchiopoda Diplostraca spinicaudata from the benxi formation in taiyuan north china and its stratigraphic significance
Performance Evaluation, 2020Co-Authors: Huanyu Liao, Jian Gao, Xinneng Lian, Chenyang Cai, Zhuo Feng, Diying HuangAbstract:Clam shrimp (Spinicaudata) are worldwide distributed branchiopod crustaceans specialised in ephemeral freshwater habitats. The Carboniferous is an important period for the early evolution and diversification of clam shrimp. Compared with the rare and geographically confined fossil record of the Devonian, clam shrimp in the Carboniferous have a much wider geographical distribution and higher biodiversity. Over 20 genera of clam shrimp have been recorded in the Carboniferous all over the world, but they are sparse in China. To date, five records of Carboniferous clam shrimp have been reported from China (Pruvost, 1927; Zhang et al., 1976; Wang, 1987; Zheng et al., 1988; Liu & Fan, 1995; Liao et al., 2019). Among them, four species Lioestheria? mathieui Pruvost, 1927, Protomonocarina huixianensis Wang, 1987, Retrofractus lingyuanensis Liu & Fan, 1995, and Pemphilimnadiopsis cheni Liao, Shen & Huang, 2019, are found in the Pennsylvanian Benxi Formation in North China (Pruvost, 1927; Zhang et al., 1976; Wang, 1987; Liu & Fan, 1995; Liao et al., 2019).
-
clam shrimp fauna Diplostraca spinicaudata and estheriellina from the lower cretaceous of las hoyas cuenca spain
Cretaceous Research, 2020Co-Authors: Oscar Florencio Gallego, Huanyu Liao, Mateo D Monferran, Iracema Zacarias, Victoria C Jimenez, Angela D BuscalioniAbstract:Abstract New invertebrate records from the Lower Cretaceous Las Hoyas site (La Huerguina Formation, Iberian Range, Spain) are here described, among them, the first record of clam shrimps from this unit. This fauna includes a new afrograptid, Lahuerguinagrapta multicostata gen. et sp. nov., the eosestherioid-polygraptid Skyestheria sp., and the anthronestheriid Pseudestherites sp. This fauna is characterized by large individuals with wide growth bands, suggesting favorable paleoenvironmental conditions. Regarding preservation, according to the analysis of energy dispersive X-ray spectrometry, carapaces are preserved mainly in calcium phosphate. These new clam shrimp records represent the third report of a European afrograptid, the second finding of the genus Skyestheria in Europe and the first European record of the genus Pseudestherites and its fourth report outside China. In addition, these findings, given their restricted stratigraphic and geographical record, support the Early Cretaceous (Barremian) age of the La Huerguina Formation and confirm the importance of the Iberian region as a bridge for the dispersion of Jurassic–Cretaceous forms from the Southern Hemisphere.
-
Pemphilimnadiopsis cheni sp. nov. (Branchiopoda: Diplostraca: Spinicaudata) from the Upper Carboniferous of East Hebei, China and its biostratigraphic significance
Palaeoentomology, 2019Co-Authors: Huanyu Liao, Yanbin Shen, Jian Gao, Diying HuangAbstract:A new conchostracan species Pemphilimnadiopsis cheni sp. nov. is found in the upper section of the Pennsylvanian Benxi Formation in Kaiping, Tangshan City, Hebei Province, China and is closely related to the type species of the genus, P. ortoni. This finding is the fifth record of the Carboniferous conchostracans in China. Its finding gives evidence that the Benxi Formation in Kaiping, Tangshan City can be restricted into middle-late Moscovian to early Kasimovian and the present conchostracan layers more likely correspond to the early Kasimovian. Moreover, the first described Palaeozoic insects come from the same layers in the Kaiping Basin. This study indicates the age of these fossil insects would be close to the boundary of Moscovian and Kasimovian and more likely the early Kasimovian.
-
Serrated microstructures on carapaces of Eosestheria (Branchiopoda: Diplostraca) in the Early Cretaceous Jehol Biota and discussion on the taxonomic value of these structures
Cretaceous Research, 2019Co-Authors: Huanyu Liao, Yanbin Shen, Diying HuangAbstract:Abstract Serrated microstructures on the growth lines of some fossil conchostracans have been previously regarded as a key characteristic for judging the family Afrograptidae. Consequently, more than 20 relatively diverse genera were assigned into Afrograptidae based on the presence of serrated structures. This has created a series of taxonomic disputes in regard to fossil conchostracans. In this study, serrated microstructures on the growth lines of two species, namely, Eosestheria ovata and E. middendorfii, in the Early Cretaceous Jehol Biota are reported and described in detail. Our microstructural study shows that these structures are pit-shaped and are actually insertion remains of setae. Such microstructures commonly exist on the growth lines of some extant spinicaudatans. The setae probably served a sensory function. The presence or absence of these setae in extant species of the same genus can be variable and size of the setae of the same species can also be variable. Thus they are not appropriate to be considered as possessing important taxonomic value. Based on this conclusion, the species of the family Afrograptidae are listed in conjunction with the results of our previous study.
-
a new afrograptid Diplostraca estheriellina from the lower cretaceous of southern england
Cretaceous Research, 2017Co-Authors: Huanyu Liao, Yanbin Shen, Oscar Florencio Gallego, Edmund A Jarzembowski, Diying HuangAbstract:The Family Afrograptidae is a ‘conchostracan’ group with multiple radial costae reaching to the umbo on their carapaces. It comprises four described genera: Afrograpta, Camerunograpta, Congestheriella and Graptoestheriella with a total of thirteen described species which are occasionally reported from the Jurassic and the Cretaceous in Africa, Europe and South America (i.e. Afrograpta from the Upper Cretaceous of Cameroon; Camerunograpta from the Jurassic to Cretaceous of Cameroon; Congestheriella from the Jurassic to Upper Cretaceous of the Congo Basin, Brazil, Bulgaria, Venezuela and Argentina; and Graptoestheriella from the Upper Jurassic to Lower Cretaceous of Brazil). A new genus and a new species, Surreyestheria ockleyensis gen. et sp. nov., belonging to the Family Afrograptidae from the Lower Cretaceous (lower Barremian) Upper Weald Clay Formation of Ockley Village, Surrey County, southern England is described in this paper. The new genus mainly differs from the other four genera by the special reticulate ornamentation on its carapace. It indicates that the Family Afrograptidae was more diverse and more widely distributed in the late Mesozoic than previously supposed. Afrograptidae is a special branch of Estheriellina the latter originating in the late Palaeozoic and the former in the early Mesozoic. Afrograptids, as a whole had been widespread across Pangea in the Early Jurassic.
Jørgen Olesen - One of the best experts on this subject based on the ideXlab platform.
-
JOURNAL OF CRUSTACEAN BIOLOGY, 27(2): 165–183, 2007 MONOPHYLY AND PHYLOGENY OF BRANCHIOPODA, WITH FOCUS ON MORPHOLOGY AND HOMOLOGIES OF BRANCHIOPOD PHYLLOPODOUS LIMBS
2015Co-Authors: Jørgen OlesenAbstract:Aspects of the evolution of the branchiopod crustaceans are reviewed and discussed. Despite views to the contrary presented in recent textbooks, the monophyly of Branchiopoda is defended based on morphological characters. The crown group Branchiopoda is supported/ diagnosed by a set of synapomorphies relating to limb morphology of both larvae and adults, including, among others, a similar naupliar swimming/feeding apparatus, a similar development of trunk limbs, and a similar morphology of adult trunk limbs with six endites (number reduced later) and an unsegmented endopod. Phyllopodous limbs are among the most well-known features of Branchiopoda, but it is uncertain whether the phyllopodous nature of the limbs in itself can be considered a synapomorphy for this group, because the limbs of other crustaceans, both recent and fossil, also can be characterised as at least partly phyllopodous. Homologies of branchiopod trunk limbs to those of other crustaceans are discussed; based on similarities to trunk limbs of certain ‘Orsten ’ fossils, it is concluded that the large, undifferentiated ‘corm ’ of the limb most likely is an enlarged basis. Within Branchiopoda, strong evidence for a monophyletic Phyllopoda sensu Preuss (all branchiopods except anostracans) is presented. A monophyletic Diplostraca is also preferred based on morphological information, and the supporting characters for this group are listed. A remarkable branchiopod crustacean from the Devonian has recently been described with morphological features combining those of Notostraca and ‘Conchostraca’; it has major significance for the understanding of early branchiopod evolution. The question of a marine versus freshwater origin of Branchiopoda is discussed
-
AN UPDATED PHYLOGENYOF THE CONCHOSTRACA — CLADOCERA CLADE (BRANCHIOPODA,Diplostraca) BY
2015Co-Authors: Jørgen OlesenAbstract:An updated phylogenetic analysis of the Conchostraca and Cladocera (Branchiopoda, Diplo-straca) is presented in response to a recently published critique of Olesen (1998). Some errors are corrected and some scorings are modi ed. Practically all earlier conclusions are supported. Among these are (1) monophyletic Diplostraca and Cladocera; (2) an uncertain status of the Conchostraca and Spinicaudata, probably they are both paraphyletic with respect to the Cladocera; (3) uncertain relationships between the four distinct taxa within the Cladocera, though some support was found for the Gymnomera (Haplopoda and Onychopoda). ZUSAMMENFASSUNG Als Antwort auf eine jüngst publizierte Kritik an Olesen (1998) wird eine aktualisierte phylo-genetischeAnalyse der Conchostracaund Cladocera (Branchiopoda,Diplostraca) präsentiert. Einige Fehler der früheren Analyse werden korrigiert, einige Merkmals-Kodierungen modi ziert. Prak-tisch alle Schlußfolgerungen werden erneut unterstützt, so 1. die Monophylie der Diplostraca und der Cladocera, 2. der unsichere Status der Conchostraca und der Spinicaudata, beide Taxa sind wahrscheinlichparaphyletisch,und 3. die unsicherenVerwandtschaftsbeziehungender vier höhere
-
Male claspers in clam shrimps (Crustacea, Branchiopoda) in the light of evolution: a case study on homology versus analogy.
Journal of Experimental Zoology, 2014Co-Authors: Tomonari Kaji, Martin Schwentner, Martin Fritsch, Jørgen Olesen, Stefan RichterAbstract:Male “clam shrimps” possess highly modified first (and second) trunk limbs for clasping the carapace of females during copulation. Claspers are present in all three clam shrimp taxa (Laevicaudata, Spinicaudata, and Cyclestherida) but despite striking similarities in their morphology and function, the matter of their homology is controversial. In this study, we address the question of the homology and evolution of these structures by comparing the developmental transformation of an unspecialized trunk limb into a clasper. In addition, we study the musculature and the nervous system in trunk limbs and claspers using confocal laser scanning microscopy. We establish that most (but not all) of the various parts of the claspers are homologous between clam shrimp taxa. We suggest that a single pair of claspers was already present in the ground pattern of Diplostraca, probably most comparable to those in Cyclestherida. The claspers, therefore, do not represent a case of analogy. J. Exp. Zool. (Mol. Dev. Evol.) 322B: 269–280, 2014. © 2014 Wiley Periodicals, Inc.
-
Onychocaudata (Branchiopoda: Diplostraca), a new high-level taxon in branchiopod systematics
Journal of Crustacean Biology, 2013Co-Authors: Jørgen Olesen, Stefan RichterAbstract:The systematics of Branchiopoda has received much attention in recent years, and a full understanding of the higher-level classification seems close. Based on a number of phylogenetic analyses involving both morphological and molecular data, some higher-level taxon names have been resurrected in the last decades (Phyllopoda, Diplostraca, Cladocera, Gymnomera) and new names for new hypotheses have been suggested (Cladoceromorpha). Herein we suggest Onychocaudata n. tax. as a name for a clade consisting of Spinicaudata and Cladoceromorpha. This clade has in various previous publications received much morphological support (telsonal region and compound eye characters) as well as strong molecular support. We also argue that the name Diplostraca is best retained with its original content (‘bivalved branchiopods’) since there is still much evidence (especially morphological) for its monophyly and competing hypotheses, e.g., Notostraca and Laevicaudata as sister taxa, are less well supported.
-
Department of Invertebrates, Natural History Museum of Denmark,
2012Co-Authors: Jørgen OlesenAbstract:Phylogeny of Branchiopoda (Crustacea) has received intensive attention the last decade and a widely accepted full resolution of the relationships between the major branchiopod taxa is close. Various well-preserved fossil branchiopods (e.g., Castracollis, Lepidocaris, Kazacharthra, Leptodorosida) combine characters from major recent taxa and are therefore necessary for a full understanding of branchiopod phylogeny and evolution. Here is presented a morphology-based phylogenetic analysis of Branchiopoda, which combines recent taxa with the most well-preserved and informative fossils. The analysis results in support of the following clades: Branchiopoda, Sarsostraca ( = Anostraca + Lepidocaris), Phyllopoda, Calmanostraca ( = Kazacharthra + Notostraca), an unnamed clade consisting of Castracollis and Calmanostraca, Diplostraca, an unnamed clade consisting of Spinicaudata and Cladoceromorpha, Spinicaudata, Cladoceromorpha, Cladocera, and Gymnomera. The character support for all clades is presented, which provides a basis for a discussion of aspects of branchiopod evolution.> Key word
Diying Huang - One of the best experts on this subject based on the ideXlab platform.
-
discovery of pemphilimnadiopsis cheni branchiopoda Diplostraca spinicaudata from the benxi formation in taiyuan north china and its stratigraphic significance
Performance Evaluation, 2020Co-Authors: Huanyu Liao, Jian Gao, Xinneng Lian, Chenyang Cai, Zhuo Feng, Diying HuangAbstract:Clam shrimp (Spinicaudata) are worldwide distributed branchiopod crustaceans specialised in ephemeral freshwater habitats. The Carboniferous is an important period for the early evolution and diversification of clam shrimp. Compared with the rare and geographically confined fossil record of the Devonian, clam shrimp in the Carboniferous have a much wider geographical distribution and higher biodiversity. Over 20 genera of clam shrimp have been recorded in the Carboniferous all over the world, but they are sparse in China. To date, five records of Carboniferous clam shrimp have been reported from China (Pruvost, 1927; Zhang et al., 1976; Wang, 1987; Zheng et al., 1988; Liu & Fan, 1995; Liao et al., 2019). Among them, four species Lioestheria? mathieui Pruvost, 1927, Protomonocarina huixianensis Wang, 1987, Retrofractus lingyuanensis Liu & Fan, 1995, and Pemphilimnadiopsis cheni Liao, Shen & Huang, 2019, are found in the Pennsylvanian Benxi Formation in North China (Pruvost, 1927; Zhang et al., 1976; Wang, 1987; Liu & Fan, 1995; Liao et al., 2019).
-
Pemphilimnadiopsis cheni sp. nov. (Branchiopoda: Diplostraca: Spinicaudata) from the Upper Carboniferous of East Hebei, China and its biostratigraphic significance
Palaeoentomology, 2019Co-Authors: Huanyu Liao, Yanbin Shen, Jian Gao, Diying HuangAbstract:A new conchostracan species Pemphilimnadiopsis cheni sp. nov. is found in the upper section of the Pennsylvanian Benxi Formation in Kaiping, Tangshan City, Hebei Province, China and is closely related to the type species of the genus, P. ortoni. This finding is the fifth record of the Carboniferous conchostracans in China. Its finding gives evidence that the Benxi Formation in Kaiping, Tangshan City can be restricted into middle-late Moscovian to early Kasimovian and the present conchostracan layers more likely correspond to the early Kasimovian. Moreover, the first described Palaeozoic insects come from the same layers in the Kaiping Basin. This study indicates the age of these fossil insects would be close to the boundary of Moscovian and Kasimovian and more likely the early Kasimovian.
-
Serrated microstructures on carapaces of Eosestheria (Branchiopoda: Diplostraca) in the Early Cretaceous Jehol Biota and discussion on the taxonomic value of these structures
Cretaceous Research, 2019Co-Authors: Huanyu Liao, Yanbin Shen, Diying HuangAbstract:Abstract Serrated microstructures on the growth lines of some fossil conchostracans have been previously regarded as a key characteristic for judging the family Afrograptidae. Consequently, more than 20 relatively diverse genera were assigned into Afrograptidae based on the presence of serrated structures. This has created a series of taxonomic disputes in regard to fossil conchostracans. In this study, serrated microstructures on the growth lines of two species, namely, Eosestheria ovata and E. middendorfii, in the Early Cretaceous Jehol Biota are reported and described in detail. Our microstructural study shows that these structures are pit-shaped and are actually insertion remains of setae. Such microstructures commonly exist on the growth lines of some extant spinicaudatans. The setae probably served a sensory function. The presence or absence of these setae in extant species of the same genus can be variable and size of the setae of the same species can also be variable. Thus they are not appropriate to be considered as possessing important taxonomic value. Based on this conclusion, the species of the family Afrograptidae are listed in conjunction with the results of our previous study.
-
a new afrograptid Diplostraca estheriellina from the lower cretaceous of southern england
Cretaceous Research, 2017Co-Authors: Huanyu Liao, Yanbin Shen, Oscar Florencio Gallego, Edmund A Jarzembowski, Diying HuangAbstract:The Family Afrograptidae is a ‘conchostracan’ group with multiple radial costae reaching to the umbo on their carapaces. It comprises four described genera: Afrograpta, Camerunograpta, Congestheriella and Graptoestheriella with a total of thirteen described species which are occasionally reported from the Jurassic and the Cretaceous in Africa, Europe and South America (i.e. Afrograpta from the Upper Cretaceous of Cameroon; Camerunograpta from the Jurassic to Cretaceous of Cameroon; Congestheriella from the Jurassic to Upper Cretaceous of the Congo Basin, Brazil, Bulgaria, Venezuela and Argentina; and Graptoestheriella from the Upper Jurassic to Lower Cretaceous of Brazil). A new genus and a new species, Surreyestheria ockleyensis gen. et sp. nov., belonging to the Family Afrograptidae from the Lower Cretaceous (lower Barremian) Upper Weald Clay Formation of Ockley Village, Surrey County, southern England is described in this paper. The new genus mainly differs from the other four genera by the special reticulate ornamentation on its carapace. It indicates that the Family Afrograptidae was more diverse and more widely distributed in the late Mesozoic than previously supposed. Afrograptidae is a special branch of Estheriellina the latter originating in the late Palaeozoic and the former in the early Mesozoic. Afrograptids, as a whole had been widespread across Pangea in the Early Jurassic.
Oscar Florencio Gallego - One of the best experts on this subject based on the ideXlab platform.
-
clam shrimp fauna Diplostraca spinicaudata and estheriellina from the lower cretaceous of las hoyas cuenca spain
Cretaceous Research, 2020Co-Authors: Oscar Florencio Gallego, Huanyu Liao, Mateo D Monferran, Iracema Zacarias, Victoria C Jimenez, Angela D BuscalioniAbstract:Abstract New invertebrate records from the Lower Cretaceous Las Hoyas site (La Huerguina Formation, Iberian Range, Spain) are here described, among them, the first record of clam shrimps from this unit. This fauna includes a new afrograptid, Lahuerguinagrapta multicostata gen. et sp. nov., the eosestherioid-polygraptid Skyestheria sp., and the anthronestheriid Pseudestherites sp. This fauna is characterized by large individuals with wide growth bands, suggesting favorable paleoenvironmental conditions. Regarding preservation, according to the analysis of energy dispersive X-ray spectrometry, carapaces are preserved mainly in calcium phosphate. These new clam shrimp records represent the third report of a European afrograptid, the second finding of the genus Skyestheria in Europe and the first European record of the genus Pseudestherites and its fourth report outside China. In addition, these findings, given their restricted stratigraphic and geographical record, support the Early Cretaceous (Barremian) age of the La Huerguina Formation and confirm the importance of the Iberian region as a bridge for the dispersion of Jurassic–Cretaceous forms from the Southern Hemisphere.
-
a new afrograptid Diplostraca estheriellina from the lower cretaceous of southern england
Cretaceous Research, 2017Co-Authors: Huanyu Liao, Yanbin Shen, Oscar Florencio Gallego, Edmund A Jarzembowski, Diying HuangAbstract:The Family Afrograptidae is a ‘conchostracan’ group with multiple radial costae reaching to the umbo on their carapaces. It comprises four described genera: Afrograpta, Camerunograpta, Congestheriella and Graptoestheriella with a total of thirteen described species which are occasionally reported from the Jurassic and the Cretaceous in Africa, Europe and South America (i.e. Afrograpta from the Upper Cretaceous of Cameroon; Camerunograpta from the Jurassic to Cretaceous of Cameroon; Congestheriella from the Jurassic to Upper Cretaceous of the Congo Basin, Brazil, Bulgaria, Venezuela and Argentina; and Graptoestheriella from the Upper Jurassic to Lower Cretaceous of Brazil). A new genus and a new species, Surreyestheria ockleyensis gen. et sp. nov., belonging to the Family Afrograptidae from the Lower Cretaceous (lower Barremian) Upper Weald Clay Formation of Ockley Village, Surrey County, southern England is described in this paper. The new genus mainly differs from the other four genera by the special reticulate ornamentation on its carapace. It indicates that the Family Afrograptidae was more diverse and more widely distributed in the late Mesozoic than previously supposed. Afrograptidae is a special branch of Estheriellina the latter originating in the late Palaeozoic and the former in the early Mesozoic. Afrograptids, as a whole had been widespread across Pangea in the Early Jurassic.
-
palaeontological collections of lille university sciences and technologies ii Diplostraca types and figured specimens
Annales de la Société Géologique du Nord, 2015Co-Authors: Jessie Cuvelier, Marie Hennion, Oscar Florencio Gallego, Daniel VachardAbstract:An exceptional collection of Diplostraca (Spinicaudata, Leaiina) from various geographic localities all around the world and from Devonian to Jurassic beds, is re-described in this catalogue. Despite some imperfections due to the geopolitical climate of the epoch (the Cold War), the great value of the Defretin's and Novozhilov's work is confirmed. New interpretations are provided about discussed taxa: Estheriina, Pseudoasmussia, Taimyrites, Fernandoalmeidium, Pseudestheria, and Teixeirium. Used as a reference work, this catalogue might permit these taxa to be reviewed in light of new methodologies and taxonomic schemes currently employed. Some species remain enigmatic, "Estheria" destombesi, "Lioestheria" toricata, "Lioestheria" propinqua and "Pseudoasmussia" striata, but offer a great possibility of revision by means of the data of this catalogue. The early record of Devonian-Carboniferous spinicaudatans in our collection is noteworthy, and provides important information on the early diversification of this group
-
the first spinicaudatan crustacea Diplostraca from permo triassic continental sequences of south america and its palaeoecological context
Alcheringa, 2013Co-Authors: Lara Vaz Tassi, Oscar Florencio Gallego, Mariana Monti, Ana Maria Zavattieri, Maria Belen LaraAbstract:Tassi, L.V., Monti, M., Gallego, O.F., Zavattieri, A.M. & Lara, M.B., 2013. The first spinicaudatan (Crustacea:Diplostraca) from Permo-Triassic continental sequences in South America and its palaeoecological context. Alcheringa 37, 187–199. ISSN 0311-5518. Cornia martinsnetoi sp. nov., the first spinicaudatan from Permian–Triassic continental sequences of southern South America, is described. The new species has characters diagnostic of the typical late Palaeozoic–Early Triassic subfamily Vertexiinae from Gondwana. This new taxon was found in tuffaceous siltstones in the upper part of the Quebrada de los Fosiles Formation (Puesto Viejo Group), which may span the Permo-Triassic boundary in Argentina. The lower and coarser-grained interval of the Quebrada de los Fosiles Formation was deposited in distal alluvial fans and low- to high-sinuosity rivers. The upper fine-grained interval of this formation, which hosts the spinicaudatans and associated fossils (ostracods, megaspores, fish scales), was deposited i...
-
the genus congestheriella kobayashi 1954 conchostraca Diplostraca afrograptioidea redescription and new combination to isaura olsoni bock from venezuela and a new species from argentina upper jurassic
Alavesia, 2011Co-Authors: Oscar Florencio Gallego, Shen Yanbin, Nora Graciela Cabaleri, Mauricio HernandezAbstract:Fil: Gallego, Oscar Florencio. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Nordeste. Centro de Ecologia Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecologia Aplicada del Litoral; Argentina
Yanbin Shen - One of the best experts on this subject based on the ideXlab platform.
-
Pemphilimnadiopsis cheni sp. nov. (Branchiopoda: Diplostraca: Spinicaudata) from the Upper Carboniferous of East Hebei, China and its biostratigraphic significance
Palaeoentomology, 2019Co-Authors: Huanyu Liao, Yanbin Shen, Jian Gao, Diying HuangAbstract:A new conchostracan species Pemphilimnadiopsis cheni sp. nov. is found in the upper section of the Pennsylvanian Benxi Formation in Kaiping, Tangshan City, Hebei Province, China and is closely related to the type species of the genus, P. ortoni. This finding is the fifth record of the Carboniferous conchostracans in China. Its finding gives evidence that the Benxi Formation in Kaiping, Tangshan City can be restricted into middle-late Moscovian to early Kasimovian and the present conchostracan layers more likely correspond to the early Kasimovian. Moreover, the first described Palaeozoic insects come from the same layers in the Kaiping Basin. This study indicates the age of these fossil insects would be close to the boundary of Moscovian and Kasimovian and more likely the early Kasimovian.
-
Serrated microstructures on carapaces of Eosestheria (Branchiopoda: Diplostraca) in the Early Cretaceous Jehol Biota and discussion on the taxonomic value of these structures
Cretaceous Research, 2019Co-Authors: Huanyu Liao, Yanbin Shen, Diying HuangAbstract:Abstract Serrated microstructures on the growth lines of some fossil conchostracans have been previously regarded as a key characteristic for judging the family Afrograptidae. Consequently, more than 20 relatively diverse genera were assigned into Afrograptidae based on the presence of serrated structures. This has created a series of taxonomic disputes in regard to fossil conchostracans. In this study, serrated microstructures on the growth lines of two species, namely, Eosestheria ovata and E. middendorfii, in the Early Cretaceous Jehol Biota are reported and described in detail. Our microstructural study shows that these structures are pit-shaped and are actually insertion remains of setae. Such microstructures commonly exist on the growth lines of some extant spinicaudatans. The setae probably served a sensory function. The presence or absence of these setae in extant species of the same genus can be variable and size of the setae of the same species can also be variable. Thus they are not appropriate to be considered as possessing important taxonomic value. Based on this conclusion, the species of the family Afrograptidae are listed in conjunction with the results of our previous study.
-
The Crustacea of the Insect Bed (latest Eocene) of the Isle of Wight, England, including the first spinicaudatan (clam shrimp) from the British Cenozoic
'Cambridge University Press (CUP)', 2019Co-Authors: Gallego, Oscar Florencio, Yanbin Shen, Ed Jarzembowski, Slipper, Ian J., Self Angela, Monferran, Mateo DanielAbstract:The crustacean fauna of the Insect Bed (late Eocene), Isle of Wight is reviewed. The fauna comprises the branchiopod Branchipodites vectensis Woodward, 1879, ostracod Potamocypris brodiei Jones and Sherborn, 1889, and isopod Eosphaeroma margarum (Desmarest, 1822). In addition a new clam shrimp (Crustacea: Diplostraca: Spinicaudata) is described and named Paraleptestheria mitchelli sp. nov. This is the first record of the genus outside China and the first 'conchostracan' to be described from the European Cenozoic.Fil: Gallego, Oscar Florencio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; ArgentinaFil: Yan Bin, Shen. Chinese Academy of Sciences; ChinaFil: Jarzembowski, Ed. Natural History Museum; Reino Unido. Chinese Academy of Sciences; ChinaFil: Slipper, Ian J.. University of Greenwich; Reino UnidoFil: Self, Angela. Natural History Museum; Reino UnidoFil: Monferran, Mateo Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentin
-
a new afrograptid Diplostraca estheriellina from the lower cretaceous of southern england
Cretaceous Research, 2017Co-Authors: Huanyu Liao, Yanbin Shen, Oscar Florencio Gallego, Edmund A Jarzembowski, Diying HuangAbstract:The Family Afrograptidae is a ‘conchostracan’ group with multiple radial costae reaching to the umbo on their carapaces. It comprises four described genera: Afrograpta, Camerunograpta, Congestheriella and Graptoestheriella with a total of thirteen described species which are occasionally reported from the Jurassic and the Cretaceous in Africa, Europe and South America (i.e. Afrograpta from the Upper Cretaceous of Cameroon; Camerunograpta from the Jurassic to Cretaceous of Cameroon; Congestheriella from the Jurassic to Upper Cretaceous of the Congo Basin, Brazil, Bulgaria, Venezuela and Argentina; and Graptoestheriella from the Upper Jurassic to Lower Cretaceous of Brazil). A new genus and a new species, Surreyestheria ockleyensis gen. et sp. nov., belonging to the Family Afrograptidae from the Lower Cretaceous (lower Barremian) Upper Weald Clay Formation of Ockley Village, Surrey County, southern England is described in this paper. The new genus mainly differs from the other four genera by the special reticulate ornamentation on its carapace. It indicates that the Family Afrograptidae was more diverse and more widely distributed in the late Mesozoic than previously supposed. Afrograptidae is a special branch of Estheriellina the latter originating in the late Palaeozoic and the former in the early Mesozoic. Afrograptids, as a whole had been widespread across Pangea in the Early Jurassic.
-
soft body preservation in the leaiid clam shrimp branchiopoda Diplostraca and its palaeoecological implications
Crustaceana, 2014Co-Authors: Yanbin Shen, Frederick R SchramAbstract:Leaia is a special genus of extinct “conchostracan” branchiopods; its soft parts have not been known until now. The leaiid specimens with soft bodies reported in the present paper came from two localities: the Upper Carboniferous Canso Group of New Brunswick, Canada, and the Permian Mount Glossopteris Formation of the Ohio Range, Holick Mountains, Antarctica. They include head, biramous antennae, mandible, shell gland, male claspers, and digestive tube. These parts together fully demonstrate that the leaiid clam shrimp indeed should be attributed to the crustaceans, instead of Mollusca. Based on the ribbed valves and structure of soft parts it should be placed in the branchiopodan Diplostraca. We believe that this group, which went extinct at the end of the Permian, is quite different from those of Laevicaudata, Spinicaudata, and Cyclestheriida. Hence, it should have its own higher taxon, Leaiina. The well-developed and sharply pointed head, delicate and short biramous antennae, in concert with the radial ribs on the valves probably indicate a burrowing in-faunal habit.