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)
Copyright Des Beechey 2000