Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
| | Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990) |
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  (Pl. 57c): Chemnitzia pliocenica Laws, 1937; topotype, GS14430, Y14/f7505I, road cutting, Te Piki, near East Cape (Haweran) |
  (Pl. 57h): Chemnitzia pliocenica Laws, 1937; topotype, GS14430, Y14/f7505I, road cutting, Te Piki, near East Cape (Haweran) (last whorl showing characteristic cessation of intercostal grooves on upper part of base). |
Beu & Maxwell (1990): Chapter 17; p. 390; pl. 57 c,h.
Classification: Pyramidellidae: Turbonillinae
Description: Height 2.2-5.8 mm, turriculate, spire elevated. Protoconch planorboid or helicoid, of 1-2 whorls, initial whorl noticeably projecting in helicoid type. Teleoconch whorls gently to moderately convex; axial sculpture of well developed costae of varying width, spacing and inclination, reaching from upper suture to, or almost to lower suture on spire, intercostal spaces stopping abruptly at edge of base on last whorl; no definite spiral sculpture. Aperture ovate, columella concave, typically smooth but some species with a weak posterior swelling; outer lip thin, smooth within.
Comparison: Chemnitzia differs from Turbonilla primarily in having the intercostal spaces stopping abruptly at the edge of the base rather than dying out gradually on the base itself. Other turbonilline taxa in which the intercostal spaces stop in this way (i.e. Pyrgiscilla Laws, 1937, Striarcana Laws, 1937 and Gispyrella Laws, 1937) differ from Chemnitzia in having definite spiral sculpture.
Distribution: Waitakian-Recent, New Zealand; widespread, probably cosmopolitan, Eocene-Recent.
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)