Terebellum obtusum Sowerby

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 : 437-438

Terebellum obtusum Sowerby in Grant, 1840

Figure 8E

1840 Terebellum obtusum Sowerby in Grant, p. 329, pl. 26, fig. 31. = Terebellum obtusum Sowerby — d’Orbigny 1852, p. 52, no. 880. Eames 1952, p. 73. Jung 1974, p. 43, pl. 13, figs. 12–18. = Terebellum subulatum obtusum Sowerby — Jung 1974, p. 43. Kulkarni et al. 2010, p. 325.

1840 Terebellum obtusum Sowerby — Harzhauser 2009, p. 137, pl. 3, figs. 11–13. Kulkarni et al. 2010, p. 325.

2010 Terebellum (Terebellum) terebellum — Kulkarni et al. 2010, p. 325, fig. 2q.

Type material. Holotype —BMNH GG21000. The type measures 42.2 mm in length with a width of 13.5 mm ( Jung 1974).

Type locality. Soomrow , Cutch, India [Langhian] .

Diagnosis. The shell is moderately slender, with a short teleoconch of 2 ½ whorls. The labral callus is well-developed. The columella is recurved posteriorly. Sutures are not well defined.

Distribution. MIOCENE—Langhian — India Kachchh, Gurjarat ( Kulkarni et al. 2010); Kutch, Gaj Beds ( Jung 1974). Kutch, Soomrow ( d’Orbigny 1852). Aquitanian— Tanzania Ras Tipuli, Lindi Bay ( Harzhauser 2009).

Remarks. The taxon T. obtusum Sowerby, 1840 is considered synonymous with T. terebellum by some workers ( Kulkarni et al. 2010); however, the lack of defined sutures distinguishes it from the phenotypically stable T. terebellum . Dey’s (1961) references to Terebellum terebellum are not considered as T. obtusum due to the geological time scale, with Terebellum obtusum restricted to the Miocene.

Figures

FIGURE 8. Pseudoterebellum new genus and Terebellum Röding, 1798. A. Pseudoterebellum diversiornatum (Eames, 1952), holotype, NHMUK GG68239, length 10.1 mm (Jung 1974, pl. 14, figs. 12–14). B. Pseudoterebellum oympiae (Rolando, 2001), holotype, MGPD 28168, length 20.9 mm (Rolando 2001, fig. 2). C. Pseudoterebellum saudiensis (Abbass, 1972), holotype, ASU S53, length 25 mm (Abbass 1972, pl. V, figs. 1, 2). D. Terebellum cinctum Martin, 1916, holotype, RGM St10337, length 34.7 mm (Jung 1974, pl. 13, figs. 4, 6). E. Terebellum obtusum Sowerby, 1840, holotype, NHMUK GG21000, length 42.2 mm (Jung 1974, pl. 13, figs. 17, 18). F. Terebellum papilliferum Martin, 1916, lectotype, RGM St10339, length 28 mm (Jung 1974, pl. 13, figs. 9, 11).