Holothuria (Roweothuria) poli Delle Chiaje, 1824

Figure 4A, Table 4

Material examined. UF3857, Tamentefoust, Algeria, 36°48.000’N, 3°13.000’E, 0.5–10 m, Summer 2006, 1 spec. LPVCMRMS2020.205, Ouillis, Algeria, 36°7.436’N, 0°15.219’E, 5 m, June 2020, 1 spec.

Description. Soft cylindrical body, light brown to dark brown in color, sometimes exceeding 20 cm in length and 3–5 cm in width. Trivium (Figure 4 Ab) clearly separated from bivium (Figure 4 Aa) by a groove. Pedicels whitish (giving the body a white-spotted appearance), spots numerous, dense ventrally, often also dorsally but not obvious. Dorsal papillae thin, whitish, reduced, situated on reduced conical warts/tubercles. Mouth ventral; anus terminal. Tentacles 20, yellowish. Cuvierian tubules absent. Collar around mouth thin (about 0.50 mm). Calcareous ring with broad radial plates with deep, slit-like anterior notch with slightly bifurcate anterior portions and a convex posterior margin (Table 4).

Ossicles. Ossicles of body wall tables and buttons. Tables (Figure 4 Ac) with an irregular, marginally serrated disc pierced by 4 central holes and a variable number of peripheral holes. Buttons (Figure 4 Ad) of 3 types: (i) smooth with regular outline; (ii) smooth with irregular outline and (iii) with large perforations. Perforated plates of the pedicels of two types: (i) enlarged (Figure 4 Af) and (ii) elongated (Figure 4 Ae). Terminal plates on the pedicels (Figure 4 Ai). Tentacle rods straight (Figure 4 Ag) or arched (Figure 4 Ah).