Columbarium
spinicinctum (von
Martens, 1881)
Description:
Whorls with a spined or beaded keel at periphery. Spire whorls smooth
above and below periphery, or with a single rib exposed just above
suture. Body whorl with one or two, or rarely three, spiral ribs below
periphery. Base of body whorl beside aperture usually finely spirally
ribbed. Anterior canal with about six rows of thin, fine, widely spaced
spicules on upper half, lower half smooth. Aperture tear-drop shaped,
inner lip produced beyond columella in mature shells. Colour fawn, with
irregular brown axial lines in good specimens. Operculum corneous,
tear-drop shaped.
Size:
Up to 92 mm in length.
Distribution:
Endemic to Australia; Capricorn Channel, Qld, to Smoky Cape, NSW.
Habitat:
Known from 110-365 m. Moderately common.
Comparison:
This species resembles C. hedleyi in sculpture, but has a
protoconch of about half the diameter. It is more slender; for specimens
of equal length, C. spinicinctum is about two-thirds the width of
C. hedleyi.
Synonym:
Columbarium caragarang Garrard, 1966
Remarks:
The spine development is quite variable in this species. Some specimens
have only nodules on the keel and the anterior canal is almost smooth,
while at the other extreme the keel is strongly spined and the anterior
canal has numerous spicules. The smooth form was described as Columbarium
caragarang Garrard, 1966.
Fig.
1: Capricorn Channel, NE of Lady Musgrave Island, Queensland, in 210 m
(C.153754)
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