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1789-2.JPG (124495 bytes)


1787-2.JPG (84489 bytes)


Gibberula agapeta  (Watson, 1886)

Diagnosis: Shell  medium in size, opaque white; spire medium height, not immersed; outer lip thickened internally, strongly lirate within along the whole length with weaker lirae extending deep into the aperture; external varix absent; siphonal notch present ; posterior notch present but weak; columella multiplicate with total of 3-5 plaits/lirae.

Size: Up to 8 mm in length.

Distribution: Australian Museum collection: off Lady Musgrave Is, Queensland , to Bass Strait , in 38-296 metres.  Uncommon.

Comparison: This is the largest species in the family in NSW, and readily identified by its large size and lirate outer lip.  G. subbulbosa is smaller, and common as a beach shell and in shallower water. 

Synonymy: Laseron named a specimen with five columellar plaits, rather than the  three as in the holotype of G. agapeta, as M. quinqueplicata Laseron 1948.  That name was  preoccupied, and he later provided a replacement name of Kogomea royana Laseron, 1957.  He also named Marginella punicea Laseron, 1948, based on less strongly shouldered specimens of G. agapeta (Hewish in Wilson, 1994).

Fig. 1: Twofold Bay, NSW, in 5 fathoms; syntype of  Kogomea royana Laseron, 1957 (C.103382)

Fig. 2:  Jervis Bay, NSW, in 15 fathoms; syntype of Marginella punicea Laseron, 1948 (C.103367)


Copyright Des Beechey 2004