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. 25a): GS11185, D45/f8822, Slip Point, Clifden, Clifdenian (GNS) |
Beu & Maxwell (1990): Chapter 11; p. 226; pl. 25 a.
Synonymy: A. (Nassicola) magnificus Finlay 1926b, pp. 236-237; Austrofusus (Austrofusus) magnificus, Beu & Maxwell 1990, p. 226, pl. 25a.
Classification: Buccinulidae
Description: Moderately large to large for genus (height 45-60 mm), broadly bucciniform, spire 0.4-0.6 total height. Protoconch as in A. spiniferus (Pl. 21 k). Teleoconch of 7-8 whorls, first 2 or 3 convex, later whorls sharply shouldered near middle on spire; sutural ramp broad, slightly concave, whorl sides sloping inwards; last whorl with peribasal keel almost as prominent as shoulder angle, both keels becoming less prominent on later half of last whorl. Axial sculpture on early whorls of narrow, rounded costae reaching from lower suture to about 0.67 whorl height; later whorls with sharp, vertically compressed tubercles on keels — those on shoulder keel more prominent than others—joined by low, rounded costae. Spines (particularly on lower keel) becoming less prominent on later part of last whorl of some shells, and connecting costae becoming obsolete; 8-10 spines or costae per whorl. Spiral sculpture variable, of low, narrow, rounded cords and fine threads, considerably coarser on base than elsewhere. Aperture ovate, columella slightly concave above, strongly twisted to left below, forming a short, deeply notched siphonal canal; fasciole very prominent, margined above by a sharp ridge. Inner lip moderately to thickly callused; outer lip thin, finely lirate within.
Comparison: Aethocola magnifica is probably most closely related to A. spinifera (Pl. 21k) but has fewer axial costae, and has more sharply compressed spines on the spiral keels.
Distribution: Altonian-Lillburnian; Slip Point Siltstone, Slip Point, Clifden, Southland, Clifdenian (type) and from most units from Fouraye Siltstone to Lill Sand in the Clifden section, moderately common; ?Bell Bird Stream, Karamea district.
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
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Zealand)