Diameza fragilis ( Defrance, 1825 )

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 : 420-421

Diameza fragilis ( Defrance, 1825)

Figure 6A

1803 Rostellaria macroptera Lamarck , p. 220, pl. 4, figs. 5a–c.

1825 Ovula fragilis Defrance , p. 132. Pacaud 2008, p. 722. = Seraphs (Diameza) fragilis Le Renard — Caze et al. 2010, p. 446. = Diameza (Diameza) fragilis Defrance — Caze et al. 2010, p. 446, figs. 20A–E, 21.

1837 Ovula intermedia Deshayes , p. 718, pl. 95, figs. 34—36. Jung 1974, p. 32. Pacaud 2008, p. 722. = Seraphs (Diameza) intermedius Deshayes — Jung 1974, p. 32, tfs. 20, 22–25. Caze et al. 2010, p. 446. = Seraphs intermedius Deshayes — Bandel 2007, p. 137.

1865 Ovula media Deshayes , p. 572. de Gregorio 1880, p. 27. Jung 1974, p. 32. Bandel 2007, p. 138. Caze et al. 2010, p. 446. = Diameza media Deshayes, 1865, p. 572 . Cossmann 1889, p. 95. = Terebellum (Diameza) medium Wenz — Caze et al. 2010, p. 446. = Terebellum (Diameza) media Deshayes — Cossmann 1904, pp. 47, 48, pl. 3, figs. 9–12. Jung 1974, p. 32. Caze et al. 2010, p. 446. = Seraphs medium Deshayes — Bandel 2007, p. 137.

1880 Diameza deshayesi de Gregorio , p. 25, pl. VI, fig. 8. Jung 1974, p. 33. Quaggioto & Mellini 2008, p. 48, pl. VI, fig. 8.

Type material. Neotype — MNHN A28939 was designated by Caze et al. (2010) to replace the the original lost syntype, as well as a lost lectotype designated by Jung (1974). The lost type of Jung measured 6.9 mm in length and 3.8 mm in width ( Jung 1974).

Type locality. Villiers-Saint-Frédéric, France [Lutetian] .

Diagnosis. The shell is inflated and involute. The greatest diameter of the shell is adapical to the middle of the shell. The shell is smooth with only a few oblique grooves near the base of the columella. The parietal callus is weakly developed. The labrum is thickened and sinuous, being protocyrt on the lower half, and opisthocyrt above. The labrum extends past, and covers, the apex. The columella bends backward at the base.

Distribution. EOCENE—Lutetian/Bartonian— Italy San Giovanni Ilarione ( de Gregorio 1880; Jung 1974; Quaggioto & Mellini 2008). Lutetian— France Ferme de l’Orme, Yvelines ( Caze et al. 2010); Grignon, Yvelines ( Caze et al. 2010); Villiers-St-Frédéric, Yvelines ( Caze et al. 2010).

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.