The muscle scar in cavellinids and its importance for the phylogeny of platycope ostracodes |
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Authors: | MENDEL N GRAMM |
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Institution: | Institute of Biology and Pedology, Far East Science Center, USSR Academy of Sciences, 690022 Vladivostok, USSR |
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Abstract: | The adductor muscle scars of cavellinids from the Visean (in one case from the Upper Devonian) of the European part of the RSFSR have revealed a significant diversity in their morphology. Aggregate, multiserial with up to five series, bi- to triserial and nearly biserial muscle scars existed simultaneously. The verticaliserial muscle scars were initiated by a biserial larval group which in the course of evolution may have passed, due to neoteny, into the adult stage. Together with Cytherella sp. from Syria, the new data show that the genus Cytherella appeared not in Triassic nor Jurassic time, hut originated among cavellinids possibly in the Early Carboniferous. A new genus is Borovitchella , with the type species B. egorovi n. sp. |
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Keywords: | Ostracoda Cavellinidae Cytherella Borovitchella evolution neoteny Lower Carboniferous the RSFSR |
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