Cooper, G. A. (1972). Homeomorphy in recent deep-sea brachiopods. Smithsonian Contributions to Paleobiology. 11:1–25, fig. 1–5, pl. 1–4.

222425

Cooper, G. A.

1972

11:1–25, fig. 1–5, pl. 1–4

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A collection of brachiopods from the Baja California Abyssal Plain forms a deep-sea assemblage unusual in that it contains three genera that are unrelated but externally almost identical; i.e., they .are homeomorphs. One is Neorhynchia, an impunctate rhynchonellid; the second, a punctate terebratulid with short loop, is called Abyssothyris; and the third is referred to a new genus, Notorygmia, related to Macandrevia. A discussion of homeomorphy is followed by the systematics of the genera and species involved.

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