Hypostomus annectens ( Regan 1904 )

Provenzano, Francisco & Barriga, Ramiro, 2017, The species of Hemiancistrus (Siluriformes: Loricariidae) from Ecuador, Zootaxa 4272 (2), pp. 221-235 : 228-229

Hypostomus annectens ( Regan 1904)

Figure 3

Ancistrus annectens Regan, 1904: 225 , pl. 11 (fig. 2). Type locality: St. Javier and the Rio Durango, N. W. Ecuador. Hemiancistrus annectens ( Regan 1904) , Eigenmann , 1910; Isbrücker 1980; Fisch-Muller 2003; Ferraris , 2007. Hemiancistrus fugleri Ovchynnyk 1971:108 , Figs. 12–15 . Type locality: Río Bogota, Parroquia Cadondelet , 1°06'N, 78°45'W,

Province Esmeraldas, Ecuador.

Hypostomus annectens ( Regan 1904) , Armbruster et al. 2015

Material examined. All from Ecuador, Esmeraldas Province, Santiago River Basin. MEPN-3423, 3 ex., 43.0– 75.2 mm SL, Puerto Libre, río San Miguel , Manuel Olalla, February 1969 . MEPN-4080, 1 ex., 69.6 mm SL, Río Toachi , cerca de Santo Domingo de los Colorados, km 6 de la vía a Esmeraldas, J. Ayala et al., 14 September 1967 . MEPN- 4262, 1 ex., 40.7 mm SL, Estero Chapiro, a 1 km de la desembocadura del río San Miguel en el río Cayapas , R. Barriga et al., 24 September 1984 . MEPN-4263, 1 ex., 37.01 mm SL, Estero Chapiro, a 1 km de la desembocadura del río San Miguel en el río Cayapas , R. Barriga et al., 24 September 1984 . MEPN-4265 1 ex., 152.8 mm SL, Río Cayapas , a 2 km aguas abajo de la casa del MAG, R. Barriga et al., 22 September 1984 . MEPN-4489, 2 ex., 89.4- 95.5 mm SL, Estero La Comunidad, a 20 minutos aguas arriba de la boca del río Onzole , approx. 00°57'54"N 79°00'48"W, R. Barriga & R. León, 19 August 1985 . MEPN-12779, 1 ex., 214.1 mm SL, Estero La Comunidad, a 20 min aguas arriba de la boca del Onzole, approx. 00°57'54"N 79°00'48"W, R. Barriga , 20 August 1985 . MEPN- 17951, 3 ex., 163.8–175.2 mm SL, Muelle campamento forestal, approx. 01°04'39"N 78°59'38"W, R. Barriga , 10 August 1995 .

Hypostomus annectens has fourteen branched rays on caudal fin, and seven branched rays on dorsal fin. The caudal fin is furcate or markedly emarginate. The dorsal fin depressed reaches the origin of the adipose fin, in juveniles; in adults it does not reach, but is very close. The adipose fin is always present. The abdomen is almost completely covered, in adults; there are naked areas in front and in the inner side of the pelvic fins. Juveniles, have small plates on the ventral region of the head, at the level of the pectoral girdle, and sides of the abdomen, but the central region of the abdomen until behind the anus is complete naked. The species has few cheek odontodes (4–8), somewhat developed (straight, and thick compared with normal odontodes). The cheek odontodes are associated with a bony plate with reduced mobility or immobile. The color of the body and fins is brown with rounded dark or black spots. The spots on the caudal fin are smaller than in the rest of the body and fins. The abdomen has dark rounded spots. The species inhabits the Pacific slope, in NW Ecuador, exclusively in aquatic systems draining the river Santiago, Province of Esmeraldas.

Figures

FIGURE 3. Lateral and ventral view of Hypostomus annectens, MEPN 17951, 163.8 mm SL.