Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
| | Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990) |
|
  (Pl. 55k): Etremopsis haroldi Powell, 1942, GS11174, J41/f8237, shellbed behind Fallon's homestead, Ardgowan, North Otago (Altonian) |
  (Pl. 55l): Etremopsis haroldi Powell, 1942, GS11174, J41/f8237, shellbed behind Fallon's homestead, Ardgowan, North Otago (Altonian) (apex showing elaborately sculptured protoconch, and granular microsculpture on teleoconch). |
Beu & Maxwell (1990): Chapter 17; p. 384; pl. 55 k,l.
Classification: Conidae: Clathurellinae?, clade 12 (Etrema; Puillandre et al. 2008).
Description: Height 4-8 mm, fusiform, spire moderately elevated. Protoconch conical, of 5-6 whorls, first whorl globular, remainder sharply keeled, a few opisthocyrt costellae on last whorl. Microsculpture of short, discontinuous axial threads, and fine granules. Teleoconch whorls convex or angled last whorl with short neck; sculpture of prominent axial costae and spiral cords and threads; microsculpture of ubiquitous fine granules. Aperture constricted posteriorly by parietal tubercle, no other denticles on inner lip; anterior siphonal canal short; outer lip with well developed varix, lirate within; anal sinus moderately deep and narrow, on sutural ramp.
Comparison: Etremopsis is distinguished from other "clathurellines" (e.g. Clathurella Carpenter, 1857; Etrema Hedley, 1918; Glyphostoma Gabb, 1972) primarily by having a much less strongly armoured aperture, and particularly in lacking inner lip denticles or tubercles other than the parietal one.
Distribution: Duntroonian-Waiauan, New Zealand; Neogene, south-eastern Australia; Recent, Persian Gulf (Powell 1966, p. 112). Most New Zealand records of Etremopsis are from middle to outer shelf or upper bathyal assemblages.
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)