Triphora latilirata Verco, 1909

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 latilirata Verco, 1909

Figure 108

Triphora latilirata Verco 1909: 283, pl. XXVI, fig. 1.

Type locality.

"Gulf St. Vincent" (South Australia).

Type material.

Lectotype: SAM D. 13447 (fide Marshall 1983; not seen, see Remarks). Paralectotype: NHMUK 1910.3.29.45: 1 specimen, Gulf St Vincent, South Australia .

Original description.

Shell sinistral, solid, elongate-conic. Protoconch of 5 whorls, smooth and round. Spire-whorls 13, flat, sloping; suture rather wider than the spaces between the spiral ribs. Spirals 3, flat, wide, nearly smooth on the surface; interstices narrow, pimctated by close-set axial incisions, which also cut the sides of the lirae. Body-whorl rhomboidal, with three spiral ribs, towards the aperture the interspaces are occupied each by a short, rapidly-widening spiral; the axial incisions are more distinct towards the aperture. Base convex with a peripheral spiral, rounded, smooth keel, and a second more anterior, punctated between. Aperture roundly quadrate: outer lip sloping, straight, ascending at the suture and pinched into a tiny sinus, anteriorly circular and effuse; in profile straight, minutely retrocurrent at the suture, obliquely very slightly antecurrent anteriorly. Canal well marked, nearly closed, especially at the junction with the aperture, markedly recurved. Inner lip distinct, slightly erect. Colour, white.

Dim.- Length, 10.5 mm; breadth, 2.5 mm.

Locality. - Type, Gulf St. Vincent, (?) depth, with 23 others moderate: in 15 to 20 fathoms off St. Francis Island, 1 moderate; in 24 fathoms off Newland Head, 1 moderate; in 55 fathoms off Cape Borda, 1 good.

Variations.- In the shell from 55 fathoms, in the antepenultimate whorl an interstitial thread arises between the middle and anterior spirals, and becomes a definite though small lira. In some large shells a thin sutural lamina is seen between the later whorls. A large broken specimen would measure 15 mm if complete. In one individual the posterior spiral lira throughout the shell is tinged brown.

Remarks.

Verco referred to a type series consisting of multiple specimens in his original description. Marshall (1983) reported the “holotype” in SAM but this should be considered a lectotype designation according to Article 74.6 of the Code ( ICZN 1999). The label accompanying this lot reports the type locality and the wording “Co-types”, which suggests that the specimens indeed belong to the type series. Because of Marshall’s lectotype designation, these and all other syntypes are now paralectotypes.

Figures

Figure 108. Triphora latilirata Verco, 1909, Gulf St. Vincent, South Australia. A Original figure. B-K Paralectotype, NHMUK 1910.3.29.45: front (B, C), side (D, E), back (F), peristome (G, I), aperture (H), original labels (J, K). Scale bars: B-F, H: 1 mm; G, I: 0.5 mm.