Pseudoterebellum diversiornatum ( Eames, 1952 ) (Eames, 1952)

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 : 432-433

Pseudoterebellum diversiornatum ( Eames, 1952)

Figure 8A

1952 Terebellum diversiornatum Eames , p. 74, pl. 3, fig. 77.

Type material. Holotype — NHMUK GG68239 . The type measures 10.1 mm in length with a width of 4.5 mm ( Jung 1974).

Type locality. Zinda Pir , Ghazij Shales, Western Punjab, Pakistan [Ypresian] .

Diagnosis. The shell is sub-elliptical. It has a short conoidal spire that comprises one-seventh of the length of the shell. The teleoconch whorls are flat with linear sutures. The height of the whorls is proportionally slightly less than the width of the whorl. The teleoconch has fine straight axial costae, numbering ten per mm, that are slightly wider than the interval. They fade on the penultimate whorl, with the only ornamentation being ten spiral bands. The body whorl is oliviform and smooth, with the greatest width above the middle and sides slightly convex. The base of the aperture is narrow with no columnar folds.

Distribution. EOCENE—Ypresian— Pakistan Ghazij Shales, Western Punjab ( Eames 1952).

Remarks. Jung (1974) described the holotype of P. diversiornatum as an incomplete juvenile internal cast with problematic affinities.Additional weight to the generation of the new clade is provided by Eames (1952), who noted that P. diversiornatum belonged to an as yet undefined subgenus of Terebellum . A defining feature of Pseudoterebellum is the shell being widest posteriorly.

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).