Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
(Pl. 1d): holotype, Boulder Hill, Wangaloan (Auckland Museum)
(Pl. 1g): holotype, Boulder Hill, Wangaloan (Auckland Museum)
Beu & Maxwell (1990): Chapter 5; p. 80; pl. 1 d, g.
Synonymy: Finlaya parthiana Marwick 1927, p. 596
Type species of Finlaya Marwick, 1927 (not of Theobald, 1903) = Marwickia Finlay, 1930
Classification: Veneridae: Pitarinae
Description: Size moderate for family (length 35-45 mm), well inflated. Lunule large, concave, not bounded by groove; escutcheon narrow, not sunken. Exterior smooth except for commarginal grooves which are absent from middle of shell. Left hinge with a lamellar anterior cardinal, a very broad triangular median cardinal, a narrow posterior cardinal which is joined to nymph, and a strong anterior lateral tooth separated from dorsal margin by a groove. Right hinge with a small anterior cardinal, a narrowly triangular median cardinal and a curved, grooved posterior cardinal tooth; anterior lateral pit well separated from cardinals, posterior lateral tooth prominent, separated from margin by deep groove. Nymphs somewhat rugose. Pallial sinus moderately deep, truncate, slightly ascending. Internal margin smooth.
Comparison: Marwickia parthiana is readily distinguished from other New Zealand venerids by the presence of a posterior lateral tooth in the right valve. Marwickia is monotypic, but may be closely related to the Northern Hemisphere genus Dosiniopsis Conrad, 1864 (Paleocene-Eocene) which also has a right posterior lateral tooth and a rugose nymph.
Distribution: Wangaloan, Boulder Hill (type) (uncommon); Wangaloa (common).
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
(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)