Czerniavsky, 1881
Description:
Slender, thread-like, cylindrical body with numerous similar segments. External segmentation poorly or not at all indicated. Neither parapodia nor chaetae occur. Surface extremely smooth and somewhat iridescent; without external ciliation, except for the nuchal slits on the head, sometimes stiff sensory cilia on tentacles, and, exceptionally, scattered ciliary tufts. Prostomium with two short, stiff tentacles that lack internal canals. Two pigmented eyes may or may not be present. Bulb-shaped pygidium with or without appendages, mostly pre-terminally encircled by groups of adhesive gland openings; anus terminal. Muscular pharyngeal bulb absent (Polygordiidae).
For identification to species level, jump to the Picture key: Page 305: Polygordiidae
The following taxa of this family occur in the region:
Genus Polygordius
Polygordius appendiculatus
Polygordius lacteus