Parminolia Iredale, 1929

Herbert, David G., 2024, The Umboniinae (Mollusca: Gastropoda: Trochidae) of New Caledonia, with descriptions of two new genera and eight new species, plus an additional new species from the Bismarck Sea, European Journal of Taxonomy 973, pp. 1-143 : 35-36

Genus Parminolia Iredale, 1929

Parminolia Iredale, 1929a: 271 , 294.

Type species

Minolia agapeta Melvill & Standen, 1896 (original designation), Miocene to Recent, New Caledonia.

Diagnosis

Shell small and stout, lacking gloss or iridescence; trochoid turbiniform, umbilicate; sculpture of spiral cords, two of which are stronger and frequently undulant, one at shoulder and one just below this; axial sculpture of close-set, microscopic threads; umbilicus with a thickened cord just inside its rim, set off from remainder of base by a distinct furrow; interior of umbilicus with a low, broad funicle (sometimes indistinct); columella thickened and somewhat reflected, with distinct swellings at ends of umbilical cords; outer lip thick, smooth internally.

Operculum: surface lacking spiral microsculpture.

Radula: marginals 3–10 with largest cusps; cusps with an acuminate central denticle bearing 1–2 long slender basal denticles on both sides.

External anatomy: eyestalks well developed, their tips expanded and containing large black eyes; details of ctenidial structure not evident, but its tip appearing unattached.

Remarks

Iredale’s discussion of this taxon on page 271 is ambiguous in that it is unclear whether he proposed to designate Monilea apicina Gould, 1861 or Minolia agapeta Melvill & Standen, 1896 , which he considered a junior synonym of the former, to be the type species of Parminolia . The issue was clarified on page 294, where he explicitly cited Minolia agapeta as the type species of Parminolia . This matter is of significance since Minolia agapeta is not in fact a junior synonym of Monilea apicina (see Remarks under Talopena apicina below).

Resembles Kanakina gen. nov. but shell smaller, thicker, more conical and with stronger spiral sculpture. The umbilical cord lies within the umbilicus rather than at its rim and is separated from the base by a furrow. The umbilical funicle is low and broad, and a deep sulcus between it and the parietal suture is lacking.