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Troca sprial polished
Recently T. A. Garrard (1963, Journ. Mall Soc. Australia 7:45, pl. 7, fig. 5-6) described Neosimnia tinctura n. sp. from
Moreton Bay. The dentate outer lip excludes it from Neosimnia or Pellasimnia (which genus replaces Neosimnia in the
Indo-Pacific) and from the subfamily Volvinae altogether; it really belongs to the other subfamily, Ovulinae, of the family
Ovulidae (which name must replace Amphiperatidae since the author of Amphiperas, (Gronow), has been declared invalid by
opinion 261 of the International Commission of Zoological Nomenclature).
The general characters of tinctura agree with Primovuia striatula Sowerby and its Eastern subspecies renovata Iredale, which
have been figured in my monograph of Amphiperatinae in 1932 (Proc. Malac. Soc. London 20:58, figs. 17 and 16 respectively),
and differ quite from Pellasimnia formicaria Sowerby and P. subreflexa Adams & Reeve with which Gerrard compared his "new
species." Primovula striatula striatula lives in the Arabian Sea, its subspecies renovata spreads from Malaysia through
Queensland to Sydney, and a third subspecies, verconis Cotton & Godfrey, has been found in South Australia and Albany (see
Schilder 1941, Archiv. Mollusk. 73:107).
The renovata from Mackay and Yeppoon as well as those from Port Jackson are purplish pink with a whitish dorsal zone, a paler
pink outer lip, and orange extremities, the tinctura from Moreton Bay, however, are fawn with the base almost fulvous, but
otherwise identical in general features (as dorsal striation and keel, dentition of the outer lip, funiculum, fossula, orange
extremities, etc.) except in size and shape: Chart by Maria Schilder
The species was established by Duclos in 1833 (Mag. de Zool., Mollusqu., Paris), and illustrated on page 26. Monographers of
the genus Cypraea, such as Reeve, Sowerby, Roberts, and Hidalgo, erroneously recorded the species from various Indo-Pacific
localities, with the "Philippine Islands" being the favourite locality quoted; Hidalgo even reported it from the "Sandwich
Islands". Most authors treated C. esontropia as a valid species, and the Schilders, in all their papers, restricted the
distribution of the species to Mauritius.
Doubt about the species taxonomic status and distributional range, was raised by Dr. Verdcourt in his monograph on East
African Cowries (Journ. E. Afr. Nat. Hist. Soc., 23(7):282), who suggested that C. esontropia may be no more than a variety
of C. cribraria Linnaeus. A specimen of C. cribraria, with small, pale wine-coloured spots on the labial margin, collected by
Penn at Shanzu, Kenya, was thought to be C. esontropia by Mr. W. Old, Jr. (in Verdcourt).
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