Kanakina
A genus of marine snails in the family Trochidae.
Kanakina is a genus of marine gastropod mollusks, specifically sea snails, classified within the family Trochidae—commonly known as top snails. Its shell is turbiniform to somewhat flattened and depressed, with the widest part lying below the middle of each whorl. The base is slightly flattened and has an umbilicus. Fine spiral cords and even finer spiral lirae cover the surface, and the spaces between them are filled with very tiny, closely packed axial threads. The shell lacks shine and iridescence, resulting in a matte finish.
The edge of the umbilicus has a thickened, crenulated cord, and inside the umbilicus there is another thickened cord called the funicle. Above this funicle is a narrow, deep groove that lies beneath where the inner lip attaches. The columella is thickened and slightly turned outward, with distinct swellings at the ends of the umbilical cords. The inside of the outer lip is smooth and, in mature specimens, becomes slightly thickened just before the lip’s edge.
The operculum lacks spiral microsculpture on its surface. In the radula, the marginal teeth from the third to the tenth have the largest cusps. Each cusp features a large, bluntly lanceolate central denticle, which has a robust, pointed denticle on its outer base and a tiny denticle on its inner base. The eyestalks are short, and the eyes are small.
The only known species in this genus is *Kanakina glaphyrella*.
Quick Facts
- Taxon
- Kanakina
- Type Species
- Minolia glaphyrella / Melvill & Standen, 1895
Facts from the source article.
Lore & Background
The shell of Kanakina is turbiniform to depressed‑turbiniform, with the periphery positioned below mid‑whorl. The base is somewhat flattened and umbilicate. The surface is sculptured with fine spiral cords and even finer spiral lirae, while the intervals are filled with close‑set microscopic axial threads. The shell lacks gloss and iridescence, giving it a matte appearance. The umbilical margin bears a thickened cord that is crenulated by radiating pliculae. Within the umbilicus there is another thickened cord (the funicle), above which lies a narrow, deep sulcus that underlies the insertion of the inner lip. The columella is thickened and somewhat reflected, and it shows distinct swellings at the ends of the umbilical cords. The interior of the outer lip is smooth and becomes slightly thickened subterminally at maturity. In the operculum, the surface is notable for lacking spiral microsculpture. In the radula, marginal teeth 3–10 carry the largest cusps; each cusp has a large, bluntly lanceolate central denticle that bears a robust pointed denticle at its outer base and a minute denticle at its inner base. Externally, the eyestalks are short and the eyes are small.
Reader's Guide
Kanakina is a genus within the Trochidae, distinguished by its matte, non‑iridescent shell with fine spiral sculpture and microscopic axial threads. The umbilicus features a thickened, crenulated cord and an internal funicle, with a sulcus underlying the inner lip insertion. The columella is thickened and reflected, with swellings at the umbilical cord ends. The operculum lacks spiral microsculpture, and the radula has marginal teeth 3–10 with large cusps, each bearing a lanceolate central denticle flanked by a robust outer denticle and a minute inner denticle. The eyestalks are short and eyes small. The only species listed is Kanakina glaphyrella (Melvill & Standen, 1895). These details provide a comprehensive morphological description for identification and classification within the family.
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