Gobiosoma sp. b

 

IDENTIFICATION - Key: general ranges followed by maximum range in [ ]

Head Pores - Cephalic system with pores B',C,D,E,F,H'; preopercle canal with 2 pores M',N'.

Scales - Lateral series 27[25-30]; transverse scales 5[3-6]; posterior of body completely scaled, scaled extend forward in a wedge shape with the apex reaching the pectoral fin base, dorsal naked area starting around the seventh ray of the second dorsal-fin, ventral naked area starting around the seventh ray of anal-fin. Basicaudal scales present with elingate ctenii generally 5, sometimes 4 or 6.

Fins - D1-7[6-7], not filamentous; D2-11[10-11]; pectoral-16-17[14-17]; anal-10[9-11]; caudal rounded, segmented rays-17[16-18]; pelvic-rounded disk with well developed frenum, I,5 all rays branched

Head - Head rounded; mouth oblique; maxillae reaching to middle of pupil in females, posterior of pupils in larger males, anterior of pupil in juveniles; interorbital narrow, less than 1/2 eye diameter; tongue tip truncate; no barbels present.

Papillae - A transverse pattern with three vertical rows anterior to row b; rows extending from the orbit to row d; row 5s connected to the anterior of row b and continuous with row 5i/6i; rows 1-3 not extending below row d; row 5i/6i extending well below the level of row d; row n long reaching close to midline.

Color - Young (around 10 mm) mostly with small evenly spaced spots covering head and body. In larger specimens the head and body is covered with transverse dark brown bands. Body with 7 or 8 transverse bands each with a light center; bands more prominent in females; in males over 22mm bands usually discernable on upper half of body only, and posterior 4 or 5 bands often obscure. Light center of bands often sharply contrasting with dark edges, resulting in formation of 7 or 8 pairs of narrow transverse bands on body. Fins dusky, except the caudal of females, which have very faint wavy cross bands. Breast densely covered with melanophores in each sex. Urogenital papilla of males covered with melanophores, except at tip; in females papilla with melanophores at base and along lateral edges only. (Hoese 1971)

Distribution - Known from the Pacific drainage of the Panama Canal. Collected at the Miraflores Locks spillway and the Ancon boat landing, Panama Canal.

Habitat - Found under rocks and small rock ledges.

Notes - Hoese (1971) notes many abnomalities present in the type material - such as two anal or second dorsal spines, first dorsal spines irregularly spaced or rudimentary, eight pterygiophores instead of seven in D1; fin rays bent or with knobs; about 80% of the specimens have one or more of these or other conditions.