Scrupocellaria scrupea Busk, 1852

Moissette, Pierre, Antonarakou, Assimina, Kontakiotis, George, Cornée, Jean-Jacques & Karakitsios, Vasileios, 2021, Bryozoan faunas at the Tortonian-Messinian transition. A palaeoenvironmental case study from Crete Island, eastern Mediterranean, Geodiversitas 43 (26), pp. 1365-1400 : 1383

Scrupocellaria scrupea Busk, 1852

( Fig. 10 D-E)

Scrupocellaria scrupea Busk, 1852: 83 , pl. 9, figs 11-12. — Hincks 1880: 50, pl. 7, figs 11-14. — Prenant & Bobin 1966: 432, text-fig. 143. — Ryland & Hayward 1977: 138, text-fig. 66. — Zabala & Maluquer 1988: 99, text-figs 167-168. — Moissette & Spjeldnaes 1995: 788, pl. 3, figs 2-4. — Hayward & McKinney 2002: 27, fig. 11A-E.

OCCURRENCE. — Pliocene: Calabria ( Neviani 1900). Pleistocene: Calabria ( Di Geronimo et al. 1997), Rhodes ( Moissette & Spjeldnaes 1995). Recent: eastern Atlantic and Mediterranean from the surface to 150 m (and down to 500 m in the Gulf of Gascony: Jullien & Calvet 1903).

DESCRIPTION

Cellariiform colony.Internodes comprising two alternating series of zooids. Gymnocyst smooth. Oval opesia occupying slightly more than half of the zooecial length with two large septula in the distal part of the opesial margin Five spine bases on the distal rim (three on the outer edge and two on the inner part), accompanied by one slightly larger scutal basis on the internal edge. The scutum itself, rarely preserved, is rather large and its proximal lobe is more developed. Prominent triangular lateral avicularia. When present, the frontal avicularia are small and always located near the internal distal part of the ovicells, which are rounded, smooth and exhibit a small proximal fenestra. Dorsal surface with small triangular vibracularia.

REMARKS

The number of spine bases is relatively constant, but one of them, on the distal rim, is occasionally lacking. Only two spines are observable on ovicellate zooids.

Figures

FIG. 10. — A-C, Scrupocellaria cf. elliptica (Reuss, 1847);A, view of some zooids showing opesia with 4 spine bases on the outer distal part and 3 spine bases + 1 scutal spine on the inner distal rim, FAN36:AMPG(IV) 3587; B, zooids with 7 spine bases and the scutum, FAN35:AMPG(IV) 3586a; C, dorsal surface of a colony fragment with small vibracularia and radicular pores, FAN35: AMPG(IV) 3586b; D, E, Scrupocellaria scrupea Busk, 1852; D, ovicellate colony fragment, FAN35: AMPG(IV) 3590a; E, detail frontal view showing opesia with five spine bases, FAN35: AMPG(IV) 3590b; F-H, Cellaria salicornioides Lamouroux, 1816; F, part of a slender internode, FAN18: AMPG(IV) 3513a; G, detail view showing denticles and endotoichal ovicells, POTB13: AMPG(IV) 2821a; H, avicularia in frontal and lateral view (arrow), POTB13:AMPG(IV) 2821b; I, Gemellipora eburnea Smitt, 1873, broken internode showing two zooids with two oval scars separated by a thin interzooidal groove, CAP032: AMPG(IV) 3426. Scale bars: A-E, G, I, 100 µm; F, H, 200 µm.