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Cystiscus minutissimus (Tenison-Woods, 1876) Diagnosis: Shell small, colourless transparent to opaque white; spire concealed by lip callus; outer lip thickened internally, smooth; external varix absent; siphonal notch absent; posterior notch absent; lacking collabral parietal callus ridge; columella with two or three strong plaits, sometimes with several weaker lirae above. Size: About 3 mm in length. Distribution:
Comparison: This species is oval in outline, with the outer lip rising above the spire. Synonymy: Marginella pumilio Tate & May; Marginella nielseni Laseron, 1948 (Hewish in Wilson, 1994) Remarks: The illustrated specimen (Fig. 1) is one of the three syntypes of M. nielseni Laseron, 1948 from off Batemans Bay in 25-60 fathoms (46-110 m). Laseron described his species as having three plaits, which is so for two of the syntypes, but the third specimen (figured here) has two strong plaits and several weaker lirae above. The figured shell is colourless transparent - the brown colour is the dried animal inside.
Cystiscus
minutissimus of one of the few Australian cystiscids that has been
studied in detail.
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Copyright Des Beechey 2004 |