Serripecten enfieldensis (Marwick, 1926)
MARWICK, J. 1926. Molluscan fauna of the Waiarekan Stage of the Oamaru Series. Transactions and Proceedings of the New Zealand Institute, 56: 307-316, pl. 72. [p. 311, pl. 72, fig. 11]
1926 Chlamys enfieldensis Marwick, 1926
J. Marwick, 1926, plate 72.
|
«Shell of moderate size, inequilateral. Ears unequal. Sculpture: right valve with about 26 or 28 strong flattened radial ribs with wider interstices, finer on anterior part of disc, at about 20 mm. from apex a fine secondary rib appears in each interspace, concentric growth-lines cause scales on ribs, generally more apparent on interstitial riblet; posterior ear with 6 narrow radial ribs of different strengths; anterior with 3; left valve with about 40 rounded scaly ribs alternating in strength and appearing at successive stages in development of shell.
Height, 50 mm.; length, 50 mm.; thickness of one valve, 9 mm. Belongs to the C. hutchinsoni group, but differs from that species in smaller size and fewer ribs. The only fairly complete left valve is as strongly inflated as the right, but this may be exceptional.» JOHN MARWICK, 1926
|
«The origin and affinities of "S." venosus and its allies are uncertain. A few specimens of "S." venosus show sculpture of numerous fine, serrated rib1ets essentially similar to those of small forms of Serripecten including S. enfieldensis (Marwick). The riblets are grouped into fewer, larger ribs with minor interstitial riblets on "S." venosus but are not grouped on S. enfieldensis, except on a few specimens of S. aff. enfieldensis from Teschemakers Quarry, near Oamaru (GS 966, Runangan), which show an incipient tendency towards formation of compound ribs.»
BOREHAM, A. U. E. 1965. A revision of F. W. Hutton's pelecypod species described in the Catalogue of Tertiary Mollusca and Echinodermata. New Zealand Geological Survey Paleontological Bulletin, 37: 1-125, pls. 1-20. [p. 33]
|