Serripecten tiorioriensis Marwick, 1928
MARWICK, J. 1928. The Tertiary Mollusca of the Chatham Islands including a generic revision of the New Zealand Pectinidae. Transactions and Proceedings of the New Zealand Institute, 58 (4): 432-506 [p. 458, fig. 14]
1928 Serripecten tiorioriensis Marwick, 1928
J. Marwick, 1928, figures 14-21.
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«Shell rather small, fragile, subcircular, compressed, apical angle obtuse, inflation moderate, right probably more inflated than left; ears unequal; right valve with about 38 narrow, smooth, rounded ribs with smooth interstices of equal or slightly greater width. About 30 mm. from apex, ribs become sharp and scaly and a scaly riblet appears in cach of the interstices, anterior ear with 5, posterior with 6 strong radials.
Height 41 mm.; length 42 mm.; thickness (right valve) 6 mm. Locality: Tioriori. Five good specimens were collected but all are right valves, consequently the left valve is unknown. The species is closely related to Serripecten hutchinsoni, but is much more primitive as the characters showing most resemblance appear at a late stage. It is at about the same stage as S. enfieldensis Marwick from the Waiarekan tuffs but has more primary ribs.» JOHN MARWICK, 1928
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