Stathmonotus sinuscalifornici (Chabanaud 1942)

Inhabits weedy areas along rocky shores. Feeds on zooplankton.

Inhabits weedy areas along rocky shores. Feeds on zooplankton.

Stathmonotus sinuscalifornici (Chabanaud)

Parastathmonotus sinuscalifornici Chabanaud, 1942:115 [Bahia San Gabriel, Isla Espirítu Santo, Golfo de California; holotype MNHN 1942–28].

DIAGNOSIS.—The largest of the species of Stathmonotus, with both sexes reaching at least 55 mm SL (SIO 62–124). Dorsal-fin spines 40–46; segmented anal-fin rays 22–26 (lower value from Böhlke, 1953); pectoral-fin rays 6–10; segmented caudal-fin rays 11–14; total vertebrae 47–52; precaudal vertebrae 18–21; caudal vertebrae 29–32 (Tables 3, 5); pleural ribs 18–20; epineurals 33–38. Body naked; supraorbital cirrus rounded and flap-like; other cirri absent. Head more swollen and maxillary longer in males than in females.

COLORATION.—Sexually dimorphic and variable. Some males (in preservative) lack evident melanophores. Others have only a small, dark spot posterior to the orbit at the dorsalmost posterior infraorbital (PIO) sensory pore and a dark line above the jaw, or they have these markings plus a dark spot on the cheek (at the dorsalmost preopercular sensory pore), a series of dark spots, one at each lateral-line placode, a dark margin on the supraorbital cirrus, and a dark spot on the middle of the pelvic fin. Still others have larger and more numerous spots on the head and body, a row of spots on the distal margin of the anal fin, and spots along the ventral margin of the pectoral fin (e.g., USNM 201162, Figure 18a,b). In the dark morph, the head, body, and fins may be completely dark, being covered with uniform, fully expanded melanophores, except for the distal margin of the caudal fin, the distal tips of the dorsal fin and anal fin posteriorly, the distal half of the pelvic fin, the supraorbital cirri, the interorbit, and the nostril tubes, all of which are pale (e.g., UAZ 82–2). Some dark morphs have pale Vs or pale spots along the dorsal fin and inverted pale Vs or pale spots on the anal fin (e.g., UAZ 77–50; Figure 18c). Dark morphs, like the pale morphs, often have the lateral-line placodes recognizably darker than the background. Some specimens (e.g., UAZ 75–33–11) are intermediate between the pale and dark morphs. The head and body may be mottled with both dark and pale spots; V-shape pale areas, which may be continuous with one another, may be present along the distal margin of the dorsal fin posteriorly, and inverted Vs may be present along the anal fin posteriorly.

Table 5.—Frequency distributions for certain characters in Stathmonotus sinuscalifornici from the coasts of three Mexican states bordering the Gulf of California and the Bahia Magadalena area on the Pacific coast of Baja California (SAFR =segmented anal-fin rays; SCFR = segmented caudal-fin rays).

Females often lack pigment on the body but have a network of about six dark lines extending from the eye ventrally across the jaws, cheek, and branchiostegals, and dark spots on the middle of the pelvic fin. Some females also have rows of small spots along the body, usually at the lateral-line placodes (e.g., UAZ 75–33–11). Females also may have dark morphs (e.g., SIO 65–352), in which the body and fins are dark except for V-shape pale areas along the dorsal fin, small inverted V-shape pale areas along the anal fin, a narrow pale margin on the anal fin, and, unlike dark males, pale bands on the lower jaw.

COMMENTS.—This species exhibits considerable geographic variation in meristics (Table 5). Specimens from the southern Gulf of California (Baja California Sur) generally exhibit the lowest mean numbers of dorsal-fin spines, anal-fin rays, and total, precaudal, and caudal vertebrae.

DISTRIBUTION.—Eastern Pacific: Gulf of California, from Puerto Lobos southward to Cabo San Lucas, and the adjacent outer coast of Baja to Bahia Magdelena (Figure 14). Reports of this species from Mazatlán, Sinaloa, Mexico (van der Heiden and Findley, 1988), are doubtful. All specimens that we have examined from Mazatlán and southward along the coast of Mexico are S. lugubris.

MATERIAL EXAMINED.—Mexico, Sonora: Puerto Lobos, UAZ 69–8–6 (2), 69–16–9 (1), 77–50 (4); Isla Tiburón, UAZ 70–8–13 (2); Isla San Pedro Nolasco, UAZ 75–37–23 (19, 2 cleared and stained), 75–38–23 (4), 76–37–23 (15), USNM 323272 (1); Caleta Venecia, UAZ 82–2 (1); Bahia San Carlos, UAZ 69–65–8 (7), 73–54–5 (2), USNM 181252 (6); Isla Venado, UAZ 75–33–11 (15); Bahia Bacochibampo, SIO 68–176 (1, from the oscule of a sponge), UAZ 71–36 (23, 2 cleared and stained); Guaymas, UAZ 73–53 (2). Mexico, Baja California Norte: Isla Ángel de la Guarda, USNM 167589 (3), 167593 (1); Isla San Pedro Mártir, USNM 323273 (2), 323274 (8). Mexico, Baja California Sur: Isla San Marcos, SIO 76-273 (2); Punta Concepción, SIO 65–314 (2); Isla Coronado, UAZ 74–34 (1); Isla Carmen, SIO 65–328 (1), UAZ 74–35–6 (2); Isla Ildefonso, USNM 201162 (6, 2 cleared and stained), 323275 (1); Puerto Chileno, USMN 323271 (2); Bahia Agua Verde, USNM 200390 (3); Isla San Jose, SIO 65–265 (1), UAZ 77-42 (6); Isla Espíritu Santo, UAZ 74–37–15 (3); Pichilingue, USNM 323269 (2), 323270 (1); La Paz, SIO 65–352 (5); Cabo Pulmo, SIO 76–284 (2); Bahia Los Frailes, SIO 61–243 (1), UAZ 74–46–8 (1); Cabo San Lucas, UAZ uncataloged (1 cleared and stained); Bahia Almejas, SIO 62–121 (1), 62–124 (2 cleared and stained), 65–180 (6); Bahia Magdalena, SIO 62–713 (2), 64–54 (1).

Stathmonotus sinuscalifornici, the California worm blenny or the Gulf worm blenny, is a species of chaenopsid blenny known from the Gulf of California, in the eastern central Pacific ocean. It can reach a maximum length of 6.5 centimetres (2.6 in) TL. This species feeds primarily on zooplankton.

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Stathmonotus sinuscalifornici Stathmonotus generoko animalia da. Arrainen barruko Chaenopsidae familian sailkatzen da.