Common Name

"Bruun’s Cone "

Status

Regarded as a valid species.

Type Locality

Off Raoul Island, Kermadecs, (off New Zealand)

Distribution

Kermadec Is., Chesterfield Is. and N. New Caledonia

Maximum Reported Size

44 mm

Description

Medium-sized, moderately solid. Last whorl conical; outline convex at adapical half to three-fourths and straight (right side) or concave (left side) below. Shoulder angulate. Spire of low to moderate height, outline straight to slightly concave. Larval shell of about 3 whorls, maximum diameter about 1.2 mm. First 2.5-3 postnuclear whorls tuberculate. Teleoconch sutural ramps flat to slightly concave, with 3 increasing to 8-11 spiral grooves; latest ramps with additional spiral striae. Last whorl with variably spaced, smooth spiral ribs on basal fourth; juveniles with granulose ribs from base to shoulder.Colour changes from pale yellow to light violet during growth. Last whorl with pale orange to dark reddish brown clouds forming 2-3 spiral bands, well below and just above centre and often below shoulder. Base and siphonal fasciole may be lighter in colour. Larval shell pinkish grey. Early teleoconch sutural ramps white; later ramps violet, with brown axial blotches producing tessellated white and brown outer margins. Aperture matches exterior background in colour.

Periostracum yellowish to light brown in subadult specimens, with finely tufted ridges following ribs of the last whorl.

Shell Morphometry

L	35-61 mm
RW	0.12-0.32 g/mm
RD	0.55-0.66
PMD	0.84-0.91
RSH	0.10-0.18

Habitat & Habits

In 60-400 m; in 60-85 m at Raoul Id.; in 200- 400 m at Chesterfield Is. and north of New Caledonia.

Discussion

C. bruuni is similar to form calliginosus of C. kinoshitaiwhich can be separated by its larger size, usually narrower last whorl and more numerous tuberculate postnuclear whorls. In addition, C. bruuni has a wider larval shell and lacks the speckled appearance of C. kinoshitai. The last whorl of subadult specimens of C. kinoshitai is smooth, while that of C. bruuni is granulose.

References

• Rec. Auckland Inst. Mus. 5 (1/2): p. 84, pl. 10, fig 3.