Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
(Pl. 42g): GS10849, V20/f8572, Devil's Elbow mudstone, top of north face of Devil's Elbow hill, Napier-Wairoa Highway, central Hawke's Bay, Nukumaruan (GNS)
Beu & Maxwell (1990): Chapter 15; p. 324; pl. 42 g.
Synonymy: Clathurella hamiltoni Hutton 1885b, p. 316; Cominella huttoni "Kobelt" of Suter 1915, p. 25 (not of Kobelt); Cominula attenuata Fleming 1943, p. 203; Cominula hamiltoni
Description: Small for subgenus (15-18 mm high), tall and narrow, with tall spire, but short last whorl with short, widely open, strongly twisted canal forming a prominent short, wide fasciole. Sculpture of narrow, clearly defined, prominent, relatively widely spaced axial costae, 12-14 per whorl, crossed by many fine, low, closely spaced spiral cords, 8 on penultimate whorl, lowest 5 or 6 on base more prominent than others; without subsutural cord, obvious shoulder, or nodules. A few low, short lirae inside outer lip. Protoconch relatively large, dome-shaped, of 2.5 whorls, smooth except for axial costae on last whorl.
Comparison: Cominella hamiltoni appears to be closely related to the small, relatively simply sculptured, offshore, modern species of C. (Eucominia) and particularly the northern North Island form C. mirabilis (Powell), but differs in its smaller size and slightly coarser spiral sculpture. Relatively tall-spired specimens, named C. attenuata by Fleming (1943), appear to be tall individuals in the C. hamiltoni population.
Distribution: Nukumaruan; "Petane", i.e., Tangoio limestone outcrops on hillside north of Petane Pa, north side of Esk River near mouth, central Hawke's Bay, Nukumaruan (type of Clathurella hamiltoni); east bank of Manawatu River three km northeast of Kumeroa, southern Hawke's Bay, early Nukumaruan (type of Cominula attenuata). Common in near-shore to mid-shelf mudstone facies in central and southern Hawke's Bay, less common in Wanganui basin and southern Wairarapa.
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)