Hyalopomatus langerhansi Ehlers 1887

Hyalopomatus langerhansi Ehlers 1887

Hyalopomatus langerhansi Ehlers, 1887, pp. 304–307, pl. 60: figs. 14–15.—Hartman, 1938, p. 20; 1959, p. 577—Knox, 1959, p. 111.

Hyalopomatopsis langerhansi.—Saint-Joseph, 1894, pp. 261, 264.

DESCRIPTION (taken from literature only).—Tube white, somewhat flattened, with slight lateral keels in the part attached to the substratum, but quite smooth and of circular cross section in the erect distal part. Total length of the animal about 11.5 mm, including 3 mm for the gill tuft. About 40 abdominal segments. Collar divided into 3 lobes; short thoracic membranes ending at the limit of segments 2 and 3. Gill tuft composed of about 12 filaments on each side. Operculum borne by the first dorsal filament on the left side which is non-pinnate and longer than the other filaments. Operculum a transparent vesicle, pear-shaped, without a differentiated distal plate. Special setae of the first thoracic segment with a group of teeth at the base of the limbate zone; these setae less numerous than the setae of the following segments. Abdominal setae capillary. Uncini of the thoracic region rasp-shaped with numerous teeth (about 20 when seen in profile) and an anterior bifurcate process. Abdominal uncini of smaller size but similar.

DISTRIBUTION.—The two original finds of Hyalopomatus langerhansi were collected by the “Blake” Expedition (1868), northwest of Cuba (near Havana in 535 m, and 23°42′N, 83°19′W, in 1573 m). There seems to be no other record of thus species in the Gulf of Mexico.