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

Rohea trigonalis (Marwick, 1927)

(Pl. 23i): GS10365, D45/f8598, Long Beach Shellbed, Clifden, Southland, Altonian (GNS)

(Pl. 23j): GS10365, D45/f8598, Long Beach Shellbed, Clifden, Southland, Altonian (GNS)

Beu & Maxwell (1990): Chapter 11; p. 219; pl. 23 i,j.

Synonymy: Paradione (Notocallista) trigonalis Marwick 1927, p. 593-594

Type species of Rohea Marwick, 1938

Classification: Veneridae: Pitarinae

Description: Rather small for subfamily (length 20-30 mm), subtrigonal, relatively robust, moderately inflated. Lunule well-defined; escutcheon barely differentiated. Sculpture of fine, closely spaced commarginal ridges and grooves anteriorly and posteriorly, remainder smooth, somewhat polished. Hinge plate broad, flat; left valve with a tubercular anterior lateral tooth, bounded above and below by a socket; a narrow anterior cardinal tooth; a triangular median cardinal; and a short, narrow posterior cardinal. Right valve with 2 tubercular anterior laterals; 2 narrow, sharp anterior cardinal teeth; and a short, weakly bifid posterior cardinal. Ligament deeply impressed. Adductor muscle scars somewhat raised above interior. Pallial sinus moderately deep, rounded, ascending. Margins smooth.

Comparison: Rohea trigonalis, the only known species of the genus, superficially resembles species of Notocallista, but has a flat rather than an excavated hinge plate, has relatively long right anterior lateral teeth, and has lateral teeth more widely separated from the cardinals than in Notocallista.

Distribution: Altonian-Lillburnian; Long Beach Shellbed, Clifden, Southland, Altonian (type) (uncommon); Lill Sand, Clifden (rare).

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)

References

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