Phylogenetic relationships between living and fossil spinicaudatan taxa (Branchiopoda Spinicaudata): reconsidering the evidence

Astrop, Timothy I.; Hegna, Thomas A.

doi:10.1163/1937240x-00002317

Cited by 45 publications

(54 citation statements)

References 42 publications

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“…The classificaiton schemes of fossil clam shrimps of Zhang et al (1976) and Chen and Shen (1985) are followed here, which include a phylogenetic hypothesis of relationships between fossil and living groups based on stratigraphic occurrence and morphological features of the carapaces. The scientific value and validity of the Chinese classification schemes have recently been reviewed by Astrop and Hegna (2015 Dimensions. In order: specimen no., number of growth lines, length of carapace (mm), heigh of carapace (mm), ratio of heigh/length: NIGPCAS 161744, 19, 3.1, 2.5, 0.81;NIGPCAS 161745, >11, 3.2, 2.1, 0.66;NIGPCAS 161746, 14, 2.7, 1.9, 0.70;NIGPCAS 161747, 15, 2.5, 1.6, 0.64;NIGPCAS 161748, 14, 2.7, 1.8, 0.67;NIGPCAS 161749, 16, 2.3, 1.6, 0.70;NIGPCAS 161750, 18, 2.4, 1.7, 0.71;NIGPCAS 161751, >10, 2.5, 1.8, 0.75;NIGPCAS 161752a, >11, 3.4, >1.7, >0.5; NIGPCAS 161752b, >11, 3.1, ?, ?…”

Section: Systematic Palaeontologymentioning

confidence: 99%

Early Cretaceous spinicaudatans (“conchostracans”) from lacustrine strata of the Sidi Aïch Formation in the northern Chotts range, southern Tunisia: Taxonomy, biostratigraphy and stratigraphic implication

Boukhalfa

Ali

et al. 2015

Cretaceous Research

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Section: Systematic Palaeontologymentioning

confidence: 99%

Early Cretaceous spinicaudatans (“conchostracans”) from lacustrine strata of the Sidi Aïch Formation in the northern Chotts range, southern Tunisia: Taxonomy, biostratigraphy and stratigraphic implication

Boukhalfa

Ali

et al. 2015

Cretaceous Research

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“…The various classification schemes in use (e.g. Astrop & Hegna ) are a result of the weight workers place on different diagnostic features. The shape of the carapace is subject to natural variability, ontogenetic shape variation and deformation, more so than ornamentation, which is unfortunately often not preserved.…”

Section: Methodsmentioning

confidence: 99%

“…(), Martin & Davis (), Braband et al . (), Olesen (), Olesen & Richter (), Astrop & Hegna () and Scholze et al . ().…”

Section: Systematic Palaeontologyunclassified

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Analysis of morphological variability in the clam shrimp Eosestheria middendorfii (Crustacea, Spinicaudata) from the Lower Cretaceous of China, and its implications for spinicaudatan taxonomy

Hethke

Fürsich

Morton

et al. 2017

Papers in Palaeontology

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Unresolved taxonomic issues regarding spinicaudatans, clam shrimps that formed the most abundant faunal element in the lacustrine Barremian to Aptian Yixian Formation, have hampered palaeoecological and evolutionary interpretations of this key fossil group. Here, we analyse morphological variability in East Asian clam‐shrimp taxa by quantifying: (1) size and shape; and (2) ornamental features (radial lirae distances). Intergeneric variability was examined using 51 specimens of various East Asian Mesozoic taxa, 16 of which were chosen for a taxonomic revision of the 10 species described from the Yixian Formation of western Liaoning. Geometric morphometrics proved to be effective for the separation of genera, while the quantification of ornamental features was species‐diagnostic. Various authors have previously indicated the possibility that East Asian clam‐shrimp species have been split excessively, a criticism that has been confirmed by our analyses. According to our results, four of the ten species described from the Yixian Formation are valid, of which one might represent a junior synonym of Diestheria jeholensis; five taxon names represent junior synonyms of Eosestheria middendorfii (Jones), and one a nomen dubium. According to lirae distances and analysis of shape, Eosestheria fuxinensis, the original type species of Eosestheria, is synonymous with the type of Diestheria. Therefore, a new type species for Eosestheria is warranted and here fixed as E. middendorfii. This taxonomic revision questions the high level of clam‐shrimp diversity recognized within the Yixian Formation, and indicates that many of the species described in fact represent various ontogenetic stages of E. middendorfii.

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“…However, the monophyly of the Spinicaudata, which includes the vast majority of "clam shrimp," is firmly established (e.g., Olesen, 2000Olesen, , 2009Stenderup et al, 2006;Richter et al, 2007;Schwentner et al, 2009). A recent review by Astrop and Hegna (2015) examined the relationships among living and fossil spinicaudatans, and their recommendations are followed herein. The systematic terminology used herein follows that of Olesen (2000) and Martin and Davis (2001) for higher-level classification and follows Chen and Shen (1985) for superfamilial and lower levels.…”

Section: Systematic Paleontologymentioning

confidence: 99%

The first Cenozoic spinicaudatans from North America

2017

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Abstract.-A new spinicaudatan species, Estherites? jocelynae new species, is described from more than fifty specimens collected from the Medicine Lodge Formation (early Oligocene) of the Beaverhead Basin in southwestern Montana, USA. This is the first spinicaudatan species reported from Cenozoic strata of North America and is the second-youngest fossil clam shrimp described globally. The new species extends the range of the superfamily Estheriteoidea into the Paleogene. Carapaces of E.? jocelynae n. sp. are preserved as a calcium carbonate replacement of the original chitin-calcium-phosphate structure, which is an uncommon style of preservation for spinicaudatans. The unique preservation coupled with the range extension suggests that the sparse Cenozoic fossil record of spinicaudatans may be partly attributable to preservation bias related to geochemical conditions rather than exclusively to diversity decline following the end-Cretaceous mass extinction. The presence of E.? jocelynae n. sp. in the Medicine Lodge Formation indicates that lakes in the Beaverhead Basin experienced seasonality and fluctuating lake levels with at least some drying at the lake margins. The ecological inferences support previous paleoenvironmental interpretations based on paleobotanical and other faunal evidence.

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Phylogenetic relationships between living and fossil spinicaudatan taxa (Branchiopoda Spinicaudata): reconsidering the evidence

Cited by 45 publications

References 42 publications

Early Cretaceous spinicaudatans (“conchostracans”) from lacustrine strata of the Sidi Aïch Formation in the northern Chotts range, southern Tunisia: Taxonomy, biostratigraphy and stratigraphic implication

Early Cretaceous spinicaudatans (“conchostracans”) from lacustrine strata of the Sidi Aïch Formation in the northern Chotts range, southern Tunisia: Taxonomy, biostratigraphy and stratigraphic implication

Analysis of morphological variability in the clam shrimp Eosestheria middendorfii (Crustacea, Spinicaudata) from the Lower Cretaceous of China, and its implications for spinicaudatan taxonomy

The first Cenozoic spinicaudatans from North America

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