Terebellum simoni Dekkers, Maxwell & Congdon, 2019

Maxwell, Stephen J., Rymer, Tasmin L. & Congdon, Bradley C., 2021, Resolving phylogenetic and classical nomenclature: A revision of Seraphsidae Jung, 1974 (Gastropoda: Neostromboidae), Zootaxa 4990 (3), pp. 401-453 : 438

Terebellum simoni Dekkers, Maxwell & Congdon, 2019

Figure 9C

2019 Terebellum simoni Dekkers, Maxwell, & Congdon , p. 16, pl. 1, figs. 1–3.

Type material. Holotype — MNHN IM-2000-33613. The type measures 44.6 mm in length with a width of 13 mm ( Jung 1974).

Type locality. Bohol Island , Philippines [Recent] .

Diagnosis. Shell slender, solid, and porcelainous in texture. The size is average relative to the three other recent species in the genus. The adult shell measures 33 to 50 mm in length. The protoconch is indistinct, and the apex of the shell always white. A distinct curved incised sutural band runs from the apex. The teleoconch has three whorls, the body whorl being the predominant feature of the shell that comprises about 90 % of the total shell length. The channel at the suture is deep and clearly visible. Above the channel is a thickened yellowish band of 1 mm maximum width. The anterior sinus is deeply incised. The body whorl is smooth, with the exception of rather coarse growth lines. The aperture is large, triangular, and bordered by a slightly thickened labrum. The columella has a well-marked callus, golden-yellow at the posterior end, becoming white at the anterior end. All shells have a goldenyellow ground colour with four evenly spaced slightly darker bands about 2 to 3 mm wide ( Dekkers et al. 2019).

Distribution. HOLOCENE— Philippines, Bohol ( Dekkers et al. 2019).

Remarks. Terebellum simoni is a morphologically stable species in colour and shape, and is rarely encountered.

Figures

FIGURE 9. Terebellum Röding, 1798. A. Terebellum delicatum Kuroda & Kawamoto in Kawamoto & Tanabe, 1956, Khánh Hòa, Nha Trang, Vietnam, length 27 mm (NMR 54693). B. Terebellum hubrechti Poppe & Tagaro, 2016, Caubian Deep, Bohol, Philippine, length 33.2 mm (image Conchology Inc.). C. Terebellum simoni Dekkers et al., 2019, Bohol Island, Philippines, length 50.6 mm (Paratype 1, AMD STR2269). D. Terebellum terebellum. D1. Vanuatu, length 63.4 mm (Coll. Guido and Philippe Poppe, 464722). D2. Solomon Islands, size unknown (NMR 44172). D3. Solomon Islands, size unknown (NMR 54964). D4. Leyte, Philippines, length 41.3 mm (Coll. Guido and Philippe Poppe, 378696).