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Paucicrura
Taxonomy
Paucicrura was named by Cooper (1956). It is not extant.
It was assigned to Paurorthidae by Mitchell (1977); to Dalmanellidae by Howe (1988); to Dalmanellinae by Hints (1975) and Williams et al. (2000); and to Orthida by Sepkoski (2002).
It was assigned to Paurorthidae by Mitchell (1977); to Dalmanellidae by Howe (1988); to Dalmanellinae by Hints (1975) and Williams et al. (2000); and to Orthida by Sepkoski (2002).
Synonyms
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Synonymy list
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Paucicrura Cooper 1956
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†Onniella quadrata variata Howe 1965
†Paucicrura corpulenta Sardeson 1892
†Paucicrura cristata Cooper 1956
†Paucicrura cristifera Cooper 1956
†Paucicrura eximia Williams 1962
†Paucicrura fistulosa Jin and Zhan 2008
†Paucicrura navis Opik 1930
†Paucicrura plana Hints 1975
†Paucicrura quadrata Wang 1949
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Invalid names: Paucicrura oklahomensis Alberstadt 1973 [synonym]
†Paucicrura robusta Hints 1975
†Paucicrura rogata Sardeson 1892
†Paucicrura sila Williams 1962
†Paucicrura subplana Cooper 1956
†Paucicrura tuloinensis Rozman and Severgina 1983
Invalid names: Cristiferina Cooper 1956 [synonym], Sigopallus [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 (Cristiferina) | Shell small, less than t inch in width, subelliptical to subcircular in outline; valves unequally convex, the brachial valve having less depth than the pedicle valve; anterior commissure gently sulcate; surface multicostellate, narrowly rounded, and strongly elevated, costellae increasing in number by intercalation. Pedicle valve with stout teeth having large fossettes; dental plates short and stout; delthyrial cavity deep; muscle area heart shaped; diductor scars protruding anterior to the ends of the dental plates and forming 2 lobes at the front of the muscle field. Traces of somewhat divergent vascula media separated by a low median ridge appear in some specimens. Brachial interior with moderately long bladelike brachiophores having short, sharp crura protruding from their inner end; brachiophores supported by strong swelling of the notothyrial platform; sockets deep; no fulcral plates; cardinal process with short, grooved shaft, expanded myophore; surface of myophore with large, recurved median plate; median ridge strongly elevated. Adductor field small. |