Thalassocyon
bonus Barnard, 1960
Description:
Whorls strongly shouldered; shoulder keel drawn out into a flange or
triangular plates. Growth lines prominent, sometimes extending into
axial lamellae. Whole shell sculptured with fine raised spiral cords,
about 20 above the keel of the body whorl and about 80 below. Outer lip
simple, columella calloused. External coloration fawn, interior polished
reddish brown.
Size:
Adult shells 38 to 77 mm in length.
Distribution:
Known from abyssal depths off South Africa, Amsterdam Is. (in the
southern Indian Ocean), eastern Australia and northern New Zealand. In
Australia, from Queensland southwards to eastern Tasmania, in 1000-2000
m.
Synonym:
Waren & Bouchet (1990) showed that a single species occurs from
South Africa eastwards to New Zealand. Therefore, the name for the New
Zealand population, Thalassocyon tui, Dell, 1967, is a synonym.
Remarks:
The anatomy of this species is described by Warén & Bouchet (1990).
Figs.
1,2: Off Ulladulla, NSW, in 560-590 m (C.163614)
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