Ficopomatus uschakovi (Pillai 1960)

Complete specimen: Irregularly curved calcareous tubes, forming agregations. Thorax colour, brown; tori colour dark brown; abdomen colour beige; dark brown medial line along the dorsum. Length, 5.0 mm; width, 0.6 mm, with 7 thoracic chaetigers and 33 abdominal chaetigers. Branchial crown colour beige, divided into two groups of radioles: six radioles on right side, and seven radioles on left side; each radiole with six transverse bands in a ring-like arrangement with wide dark brown color pattern; most basal ring wider and darker than the rest; ventral base of branchial crown black. Inter-radiolar membrane absent. Operculum spherical with radial symmetry (Fig. 2B, C, E, F), and with a sub-convex distal plate; four rows of transparent spines directed outward, with spines of the interior row approximately one-half the length of spines in the other rows; peduncle colour, beige with dark brown groove. Eyes absent. Collar with entire margin; thoracic membranes fused along the dorsum; six thoracic neuropodial tori. Chaetae from collar serrated, with one longitudinal line of teeth from the base to the apex (Fig. 2I, J), thorax with capillary chaetae (Fig. 2H), and abdomen with geniculate chaetae, proximal half serrated (Fig. 2G), and distal half smooth. Thoracic uncini saw-shaped with 6–7 teeth (Fig. 2K). Rounded pygidium with a midline incision.

Indian Ocean from the Eastern coast of Africa to Australia; Eastern Pacific in Southern Mexico; Western Atlantic, in the Colombian, Venezuelan and Brazilian Caribbean coasts. Eastern Atlantic, in the Gulf of Guinea.