Triphoris incisa Pease, 1861

Albano, Paolo G., Bakker, Piet A. J. & Sabelli, Bruno, 2019, Annotated catalogue of the types of Triphoridae (Mollusca, Gastropoda) in the Natural History Museum of the United Kingdom, London, Zoosystematics and Evolution 95 (1), pp. 161-308 : 161

Triphoris incisa Pease, 1861

Figure 78

Triphoris incisa Pease 1861: 434, not illustrated.

Type locality.

"Sandwich Islands" (Hawaiian Islands).

Type material.

Lectotype: NHMUK 1961151, designated by Kay (1965) (coll. H. Cuming). Paralectotypes: NHMUK 1961152, 5 specimens, Hawaiian Islands (coll. H. Cuming), MCZ 73738, 12 specimens, Hawaiian Islands .

Original description.

Shell subulate; whorls encircled by three prominent smooth and regular ribs, interstices deep and very finely striated longitudinally, irregularly spotted and marbled with yellowish-white, brown, and purple of various shades.

Diagnosis.

Lectotype 15.7 mm high. Shell slightly cyrtoconoid with flat whorls. Apical part broken off but the visible teleoconch (likely almost complete) has 15 whorls with three smooth spiral cords. The second develops later in the first whorls. The very first whorls have distinct tubercles on the cords. A smooth suprasutural cord is also clearly visible as well as growth lines between the cords. The peristome has additional spiral cords and a rather deep posterior sinus. The siphonal canal is long. The base has a fourth, fifth, sixth (narrow) and seventh spiral cord of which the fourth and the fifth are slightly tubercled, the others are smooth. Protoconch missing. Teleoconch brown, with the exception of the very first three whorls which are whitish to yellowish. The third spiral cord is usually lighter in colour. Small white blotches are randomly present on cords.

Figures

Figure 78. Triphoris incisa Pease, 1861, Hawaiian Islands, coll. H. Cuming. A-C, E-G Lectotype NHMUK 1961151: front (A), side (B), back (C), aperture (E), peristome (F, G). D Original labels. Scale bars: A-C: 2 mm; E-G: 1 mm.