Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
(Pl. 55b): Brooksena duplicincta Laws, 1939; topotype, GS9730, Q8/f9828, Holland's Point, Pakaurangi, Kaipara Harbour (Otaian)
Beu & Maxwell (1990): Chapter 17; p. 386; pl. 55 b.
Description: Height 1.0-3.3 mm, tall-spired; protoconch paucispiral, of about 1.5 whorls with strong spiral keels, initial whorl slightly immersed. Teleoconch whorls with 2 primary keels, additional cords appearing on later whorls on some species, and other narrow spirals on base of last whorl; axial sculpture of fine costellae. Aperture ovate, anterior end slightly effuse.
Comparison: Brooksena was long included in the Rissoidae, but Ponder (1967, p. 220) advocated its assignment to the Aclididae. More recently (Ponder 1985, p. 108) he has referred it (and Veterator Laws, 1941) to the Mathildidae, following Wenz (1940, p. 662). It resembles Mathilda Semper, 1865 in teleoconch sculpture, but differs in its small size, and in having a protoconch that is spirally keeled rather than smooth, and is not obviously heterostrophic. Veterator differs from Brooksena in having a smooth rather than a lirate protoconch.
Distribution: Waitakian-Recent, New Zealand; Miocene, Victoria.
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)