Miniseraphs eratoides ( Cossmann, 1889 )

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 : 422

Miniseraphs eratoides ( Cossmann, 1889)

Figure 6B

1889 Terebellum (Seraphs) eratoides Cossmann , p. 94, pl. 3, figs. 7, 8. Jung 1974, p. 30. Caze et al. 2010, p. 448. = Seraphs (Miniseraphs) eratoides Cossmann — Jung 1974. p. 30, pl. 9, figs. 10–12, tfs. 19, 20. Caze et al. 2010, p. 448. = Diameza (Miniseraphs) eratoides Cossmann — Caze et al. 2010, p. 448, figs. 20F–J, 22. = Terebellum eratoides Cossmann — Pacaud 2008, p. 722.

Type material. Neotype — MNHN A28933, was designated by Caze et al (2010) to replace Cossmann’s original type, which is missing, as well as the lost lectotype of Jung (1974). The dimensions provided by Jung (1974) of specimens from the type locality indicate a shell of 6.9 mm in height and 3.9 mm in width.

Type locality. Chaussy , France [Lutetian]

Diagnosis. The shell possesses a large apical angle. The greatest diameter of the shell is located on the upper part of the shell. The shell is smooth with a few faint basal spiral grooves. The labial callus is thin and weakly developed. The labrum is adapically thickened, sinuous and reaches to nearly the base of the columella. It forms a small protuberance near the apex of the shell, and possesses a siphonal notch that is moderately developed. The columella is nearly straight.

Distribution. EOCENE—Lutetian— France Fontenay-en-Vexin, Eure ( Caze et al. 2010); Chaussy, Val d’Oise, ( Jung 1974; Caze et al. 2010); Hervelon, Marne ( Caze et al. 2010).

Remarks. Miniseraphs eratoides is more basally constricted, giving an overall stouter appearance than M. isabella . There is a small protruberance on the apex of Miniseraphs eratoides that is often lost in fossils, and it is absent in Miniseraphs isabella .

Figures

FIGURE 6. Dimeza Deshayes, 1865, Miniseraphs Jung 1974 and Mauryna de Gregorio 1880. A. Diameza fragilis (Defrance, 1825), MNHN A28784, Collection de Paleontologie, Paris, length 6.9 mm (Caze et al. 2010, figs. 20A, C & E). B. Miniseraphs eratoides (Cossmann, 1889), MNHN A28785, Collection de Paleontologie, Paris, length 8.3 mm (Caze et al. 2010, figs. 20F–H). C. Miniseraphs isabella (Deshayes, 1865), MNHN A28783, Collection de Paleontologie, Paris, length 7.5 mm (Caze et al. 2010, figs. 20M–O). D. Mauryna plicata (d’Archiac & Haime, 1853), NMB H15324, length 51 mm.