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A new species of the Jurassic (Callovian) brachiopod Septirhynchia from northern Sinai

Published online by Cambridge University Press:  14 July 2015

Howard R. Feldman
Howard R. Feldman*
Affiliation:
Department of Invertebrates, The American Museum of Natural History, 79th Street at Central Park West, New York, New York 10024
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Abstract

Septirhynchia hirschi n. sp. is described from the Callovian (Jurassic) strata of Gebel El-Maghara, northern Sinai, Egypt. Significant ontogenetic changes from juvenile to adult include: 1) increase in height of the ventral median septum; 2) change from hypothyridid to mesothyridid pedicle foramen; 3) change from a pyriform to a gibbous outline; 4) change from a weakly defined to a strongly defined pedicle sulcus; and 5) change from a relatively straight to a strongly arched lateral commissure. All ontogenetic stages, except for neanic, possessed a pedicle tube. Muscle scars (diductor) were observed for the first time in the genus on several pedicle valve interiors; none were noted on any brachial valve interiors. Juveniles lived epifaunally, attached to the substrate by a small but functional pedicle, while adults lived semi-infaunally with the umbos buried in the mud.

Type
Research Article
Information
Journal of Paleontology , Volume 61 , Issue 6 , November 1987 , pp. 1156 - 1172
Copyright
Copyright © The Paleontological Society 

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