Holothuria (Holothuria) stellati Delle Chiaje, 1824

Figure 4C, Table 4

Material examined. UF5468, Sidi-Fredj, Algeria, 36°45.000’N, 2°50.000’E, 0.5–10 m, Summer 2006, 1 spec. UF5495, Stidia, Algeria, 35°49.922’N, 0°1.174’O, 3 m, Summer 2006, 1 spec. LPVCMRMS2020.208, Ouillis, Algeria, 36°7.436’N, 0°15.219’E, 5 m, June 2020, 1 spec.

Description. Body dark brown dorsally (Figure 4 Ca), light brown ventrally (Figure 4 Cb); sometimes reaching a length of 30 cm and width of 5–6 cm. Dorsal surface arched, ventral surface flattened, the latter with fairly dense, scattered pedicels. Integument thick (0.70 µm) and smooth. A row of 5–6 very large, straight pointed protuberances separated at equal intervals on both sides of body. Cuvierian tubules absent. Collar around mouth thick (about 3.50 mm).

Ossicles. Body wall tables with circular disc (Figure 4 Cc) with wavy outline and 4 large central and 4 small peripheral perforations. Buttons (Figure 4 Ce) of several types: (i) oval with irregular, rough, smooth and thick surfaces; (ii) larger ones slightly rectangular in shape, with smooth but sometimes with wavy outline; (iii) enlarged, rounded ones and (iv) those that are slightly warped in the middle. Perforated plates of the pedicels of two types: enlarged and elongated (Figure 4 Cd). Tentacles with straight (Figure 4 Cf) or slightly arched rods.