Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
(Pl. 29b): holotype, GS1037, S28/f6446, Hurupi Stream, Palliser Bay, southern Wairarapa, early Tongaporutuan (TM4517, GNS)
(Pl. 29c): holotype, GS1037, S28/f6446, Hurupi Stream, Palliser Bay, southern Wairarapa, early Tongaporutuan (TM4517, GNS)
Beu & Maxwell (1990): Chapter 13; p. 256; pl. 29 b,c.
Synonymy: Marama (Marama) hurupiensis Marwick 1927, p. 604
Classification: Veneridae: Venerinae
Description: Moderately large for family (52-60 mm long), length 1.2 x height, i.e. markedly more elongate than M. murdochi; umbones low, strongly curved forwards; dorsal and ventral margins weakly convex, posterior margin slightly quadrate, anterior margin narrowly rounded. Lunule wide, very long, strongly pouting, bounded by deep groove. Sculpture of prominent, high, moderately thick, widely spaced, commarginal lamellae, 1.5-2 mm apart over central area of disc of large shells, but eroded off much of surface of many specimens. Hinge hot seen (all specimens closed, articulated shells) but presumably as in M. murdochi.
Comparison: Marama hurupiensis differs from M. murdochi (Kapitean- Nukumaruan; Pl. 41c, d) in its longer, much less inflated shape, its longer, narrower lunule, and its much coarser sculpture, but appears likely to have been immediately (if abruptly) ancestral to M. murdochi. Earlier species of Marama (Marama) are all smaller, more inflated, and more finely sculptured, and the origin of M. hurupiensis is obscure, but shells resembling the Altonian M. ovata are common at some Lillburnian-Waiauan localities in sparsely fossiliferous sandstone and siltstone in Southland, and seem likely to be part of a lineage that led to M. hurupiensis.
Distribution: Tongaporutuan; Hurupi Stream (type) and nearby localities in Palliser Bay, southern Wairarapa, common in shallow-water "Hurupi facies" with diverse Mollusca; also in North Taranaki, Gisborne district, Marlborough, and North Canterbury.
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)