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Amalda festiva Ninomiya, 1991

Description: Shell broad, aperture length about two-thirds of total shell length.  Spire calloused, callus terminating in front of the aperture; suture covered by callus.  Spire whorls smooth or microscopically spirally ribbed, ribs ending at aperture.  Body whorl with calloused subsutural band, edged by a weak groove below.  Non-calloused part of body whorl with microscopic axial and spiral striae.  Columella smooth, without plaits; fasciolar band with weak central ridge, upper and lower halves flat and smooth; ancillid band defined by ancillid groove or by colouration, ancillid groove weak or absent.  Non-calloused areas of body whorl salmon with axial zigzag brown lines, and a spiral band of brown flames above the ancillid band; subsutural band with brown streaks or rectangular patches; fasciolar band fawn, pillar area white. Operculum unknown.

Size: Up to 25 mm in length.

Distribution: Known from Fraser Island , Queensland , to Port Kembla, NSW.

Habitat: Taken in 27-210 metres.  Uncommon.

Comparison: This species is distinguished by having no plaits on the columella.  It is very similar to large specimens of A. oblonga, but that always has ribs on the columella, even if weak.

Remarks: This species may be a deep water form of A. oblonga; it is very similar in colour pattern, and differs from large specimens of A. oblonga only by the smooth columella.  However, there is overlap in latitudinal range and depth range of the two. Pending further research, it is retained as a separate species.

Figs. 1,2: Off Danger Point, NSW (C.424096)


Copyright Des Beechey 2004