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Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)

New Zealand Cenozoic Mollusca

Notocallista (Fossacallista) watti Marwick, 1938


(Pl. 13h): holotype, Trig Z, Otiake, Waitakian (TM4578, GNS)


(Pl. 13k): holotype, Trig Z, Otiake, Waitakian (TM4578, GNS)

Beu & Maxwell (1990): Chapter 10; p. 149; pl. 13 h, k.

Synonymy: Notocallista (Fossacallista) watti Marwick 1938, p. 75

Classification: Veneridae: Pitarinae

Description: Size moderate for genus (length 20-32 mm) suboval, moderately inflated. Lunule scarcely impressed, bounded by narrow groove; escutcheon not differentiated. Sculpture of numerous closely spaced very fine commarginal grooves, surface shining. Left hinge with a prominent, high anterior lateral tooth, a lamellar anterior cardinal, a short, triangular median cardinal and a very thin posterior cardinal. Right valve with a deep anterior lateral socket bounded above and below by a short, think tooth; anterior and median cardinals short, narrow, closely spaced, subparallel; posterior cardinal narrow, grooved. Ligament deeply sunken. Pedal retractor muscle scar confluent with anterior adductor scar. Pallial sinus rather short, rounded, ascending. Internal margins smooth.

Comparison: Notocallista (Fossacallista) parki (Otaian-Lillburnian) — the type species of Fossacallista Marwick, 1938 — is very similar, but is considerably smaller (length 18-23 mm) and somewhat more coarsely sculptured than N. watti. Fossacallista differs from Notocallista (sensu stricto) and from N. (Striacallista) in having a rounded rather than a truncate pallial sinus, a deeply sunken ligament, and the pedal retractor scar muscle scar confluent with the anterior adductor scar rather than separate.

N. (Fossacallista) ranges from Duntroonian to Lillburnian in New Zealand, and is also recorded from the Late Eocene to Middle Miocene of southern Australia and Tasmania (Marwick 1938, p. 74-78).

Distribution: Waitakian; Otekaike Limestone, Trig Z, Otiake, Waitaki Valley (type); Campbell Park School, Otekaike, Waitaki Valley; Sister's Creek, Hakataramea Valley; Brother's Stream, Hakataramea Valley. Moderately to very common at these localities.

Cite this publication as: "A.G. Beu and J.I. Raine (2009). Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990). GNS Science miscellaneous series no. 27."
© GNS Science, 2009
ISBN 978-0-478-19705-1
ISSN 1177-2441
(Included with a PDF facsimile file copy of New Zealand Geological Survey Paleontological Bulletin 58 in CD version from: Publications Officer, GNS Science, P.O. Box 30368 Lower Hutt, New Zealand)


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