Anguisia verrucosa Jullien, 1882

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 : 1376-1378

Anguisia verrucosa Jullien, 1882

( Fig. 7A, B )

Anguisia verrucosa Jullien, 1882: 497, pl. 13, figs 1-2. — Harmelin 1977: 1058, figs 1-2; pl. I, figs 1, 3. — Harmelin 1979b: 414, pl. 2, fig. 3. — Harmelin & d’Hondt 1982: 7, pl. I, figs 3-4. — Moissette & Spjeldnaes 1995: 783, pl. 2, figs 1-2.

Anguisia jullieni Neviani, 1895: 129 , pl. 6, figs 39-40.

OCCURRENCE. — Pleistocene: Sicily, Calabria ( Rosso 2005), Rhodes ( Moissette & Spjeldnaes 1995). Recent: Eastern Atlantic (200- 2018 m), Mediterranean (500-1525 m).

DESCRIPTION

Erect, tubular fragile colony, arising from an encrusting uniserial basis. Zooids forming slender bifurcating cylindrical branches, ornamented by thin growth lines and scattered slightly prominent verrucae (pseudopores).

REMARKS

The gonozooid, characteristic of the genus, consisting of a simple elongated chamber with a terminal tubular ooeciostome (J.-G. Harmelin, personal communication), was not observed. The encrusting basis is visible in some of the studied specimens ( Fig. 6B ). The species created by Neviani (1895) from the Pliocene/Pleistocene of northern Italy, A. jullieni most probably corresponds to the encrusting basis of A. verrucosa. However, the homonymous A. jullieni described byOstrovsky (1998) from the present-day Antarctic is a different species. Peristome diameter and length are smaller in A. verrucosa and the prominent verrucae associated with the pseudopores are absent in A. jullieni .

Figures

FIG. 7. — A, B, Anguisia verrucosa Jullien, 1882; A, bifurcating branch, FAN36: AMPG(IV) 3471; B, encrusting base (left) and erect peristome of the encrusting proximal zooid of a running branch (right), FAN35: AMPG(IV) 3470; C, D, Exidmonea atlantica (Forbes in Johnston, 1847); C, fragment of a branch, frontal view (with a gonozooid on the left upper part), POTB13: AMPG(IV) 2853a; D, fragment of a branch, dorsal view, POTB13: AMPG(IV) 2853b; E-G, Ybselosoecia typica (Manzoni, 1878); E, fragment of a branch (with a large gonozooid), frontal view, POTB13: AMPG(IV) 2881a; F, detail of the ooeciostome of another gonozooid, POTB13: AMPG(IV) 2881b; G, fragment of a branch, dorsal view, POTB13: AMPG(IV) 2881c. Scale bars: A, D, 200 µm; B, G, 100 µm; C-E, 500 µm.

FIG. 6. — Theoretical zonation in a transect from coastal to upper bathyal palaeoenvironments following Pérès & Picard (1964). This bionomic depth zonation illustrates the situation on flat muddy bottoms in areas with very clear waters, like in the oligotrophic (eastern) Mediterranean Sea. The distribution of bryozoan growth-form assemblages (in average number of fragments per sample) and the average number of species in each assemblage is indicated in a grey circle (partly inspired from Moissette 2000).