Triphora fuscoapicata G.B. Sowerby III, 1907

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

Triphora fuscoapicata G.B. Sowerby III, 1907

Figure 93

Triphora fuscoapicata G.B. Sowerby III 1907: 301, pl. 25, fig. 9.

Type locality.

Cebu Island, Philippines.

Type material.

Syntypes: NHMUK 1907.8.28.38-40: 3 specimens, Cebu Island, Philippines .

Original description.

Testa sinistrorsa, elongato-acuminata, ad apicem acutissima, albida, hic illic fusco minute punctata, ad apicem brunnea; anfractus circa 18, embryonales 5-6 planato-declives, leaves, sequentes cingulis spiralibus gemmates 2 (interdum lira minuta interveniente) ornate, sutura impressa discreti; ultimus quadriseriatim gemmatus, infra angulatus, prope aperturam tubulatim forato munitus, ad basin depressus; rostrum crassiusculum, oblique recurvum; aperture parva, subcircularis; labrum tenue. Long. 5.5, diam. 1.12 mm.

Hab.- Island of Cebú, Philippines.

The principal feature distinguishing this species is that the embryonic whorls, numbering 5 or 6, are dark brown, showing conspicuously against the whiteness of the subsequent whorls.

Translation of the Latin text.

Elongate slender sinistral shell with a very sharp apex, whitish with sparse small brown dots, and with a brown apex; about 18 whorls, 5-6 flat-sloping away embryonic, subsequent with two beaded spiral rows (sometimes with a fine lira in between), impressed suture; last whorl with four rows, angulated at the base, with a tubular aperture near the peristome, with a depressed base; rather obtuse, recurved siphonal canal; small subcircular aperture, thin external lip. Length 5.5, diameter 1.12 mm.

Locality: Insland of Cebú, Philippines.

Diagnosis.

Syntypes ranging between 4.6 and 5.9 mm high and show considerable variation in adult shell size. Shell cyrtoconoid with flat whorls. Teleoconch of 10-13 whorls, with three spiral cords bearing tubercles at the intersections with prosocline axial ribs. The second cord appears on the fifth whorl as a narrow thread and always remains smaller than the other cords. A fourth smooth suprasutural cord is visible throughout the shell. Between the main cords run numerous fine finely tubercled spiral ribs. The peristome is well developed with additional spiral cords between the main ones. Posterior sinus well developed and protruding as a very short canal. Anterior canal quite long. Base almost flat, with a sharp angle at the periphery marked by a faint smooth spiral cord. Multispiral protoconch of six whorls; the first almost smooth, the second with numerous pustules abapically and short axial riblets apically, and the third with numerous riblets and a single spiral keel which become two in the remaining whorls. Teleoconch whitish to very light brown, first two or three whorls pure white; protoconch brown.

Figures

Figure 93. Triphora fuscoapicata G. B. Sowerby III, 1907. Cebu Island, Philippines. A-E, G, H, L Syntype NHMUK 1907.8.28.38: front (A, B), side (C, D), back (E), peristome (G), aperture (H), protoconch (L). I, J Syntype NHMUK 1907.8.28.39: front. K, M, N Syntype NHMUK 1907.8.28.40: front (K), protoconch (M, N). F Original figures. Scale bars: A-E, I-K: 1 mm; G, H: 0.5 mm; L, M: 0.2 mm; N: 0.1 mm.