8) Several different terms have been used in the literature to describe these cysts ranging from tailgut cyst to retrorectal hamartoma, cyst of the postanal
intestine, mucus-secreting cyst, retrorectal cyst and enterogenous cyst.
For individuals <30 mm in SVL, we were unable to positively distinguish the enlarged postanal
scales Judd (1973) reported for hatchling males.
tuft of a few simple cilia was dorsal to the anus.
papillae are positioned accordingly: one pair proximal (nearly perianal), one pair mesal, and one pair distal.
Ventral setae smooth and needle-like, V1, V3 and setae around anal opening short (ca 13-17 [micro]m), other setae on ventral idiosoma long, postanal
(ca 41 [micro]m) and two posterior setae (ca 50-55 [micro]m) longer than other ventral setae (ca 35-40 [micro]m).
A row of postanal
ventral melanophores (PVMs) extends from the anus to the band at 75% BL.
Sex of male neonates, juveniles, and adults was determined by presence of two enlarged postanal
scales, and animals were considered reproductively active (i.
Diagnosis: The new species is distinguished by the following combination of character states: body size 531-564 x 348-381; body surface granulate; lamellae and dorsal parts of tutoria with longitudinal lines; lamellae and translamella broad; rostral and lamellar setae shorter than interlamellar setae; sensilli short, with oval, slightly barbed head; tutorium with broad cusp distally, bearing two small teeth; areae porosae Al present, slightly visible; notogastral setae setiform, barbed; four pairs of round areae porosae present; oval postanal
area porosa (PA) present; leg setae l" on tarsi I, tibiae I, II and IV, genua I thick, with strongly conical teeth.
Larvae of northern sculpin have 35-36 myomeres, pelvic fins with one spine and two rays, a bony preopercular shelf, four preopercular spines, 3-14 irregular postanal
ventral melanophores, few, if any, melanophores ventrally on the gut, and in larger specimens, two rows of ctenoid scales directly beneath the dorsal fins extending onto the caudal peduncle.
ventral melanophores (pvm) became visible late during the embryonic development (day 51) along the ventral midline at 80% BL.
3, A and B) showed a distinct pattern of 12 to 23 small postanal
melanophores serially arranged, about one per myomere, along the ventral midline.
The number of melanophores increased along the hypural region, the postanal
ventral midline, and at the anal-fin articulations.