Comprehensive Description

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Simpsonichthys bokermanni (Carvalho & Cruz, 1987)

(Fig. 7)

Cynolebias bokermanni ZBK Carvalho & Cruz, 1987:12 ( type locality: swamp in CEPLAC ( Comissao Executiva do Piano da Lavoura Cacaueira), Municipio de Ilheus , Estado da Bahia , Brazil [about 14°50’S39°15’W ; altitude about 40 m]; holotype : MNRJ 11167 ).

Material examined

Brazil : Estado da Bahia : Municipio de Ilheus , rio Cachoeira basin : MNRJ 11167 , holotype , male, 40.5 mm SL; MNRJ 11168 , 16 paratypes ; MZUSP 28476 , 1 paratype ; MZUSP 28477 , 1 paratype ; MZUSP 28478 , 1 paratype ; MZUSP 28479 , 1 paratype ; swamp in CEPLAC; W. C. A. Bokermann , Dec. 1971 . MNRJ 19503 , 22; same locality ; W. C. A. Bokermann , 30 Apr. 1972 . MNRJ 11721 , 9; MZUSP 38432 , 2 (c&s); same locality as holotype ; U. Caramaschi, H. R. Silva & L. Carcerelli , 10 Mar. 1986 . UFRJ 1836 , 13; UFRJ 2124 , 4 (c&s); UFRJ 3162 , 1 (c&s); UFRJ 5863 , 1 (c&s); same locality ; W. J. E. M. Costa & C. P. Bove , 17 Jun. 1993 . MNRJ 19462 , 6; Itabuna ; no additional data.

Diagnosis

Distinguished from all other species of Ophthalmolebias by the unique asymmetrical distribution of greenish white dots in males, which are concentrated on the dorsal half of the caudal fin and usually are absent, sometimes minute, on ventral half of fin (vs. bright dots homogeneously distributed on caudal fin of S. constanciae and S. suzarti ZBK ; absent in all other species of Ophthalmolebias ), and the presence of white dots on dorsal fin in males (vs. white dots absent).

Description

Morphometric data appear in Table 1. Largest specimen examined 47.5 mm SL. Dorsal profile gently concave on head, convex from nape to end of dorsal-fin base, nearly straight on caudal peduncle. Ventral profile convex from lower jaw to end of anal-fin base, approximately straight on caudal peduncle. Body moderately deep, compressed, greatest body depth at level of pelvic-fin base. Eye positioned on lateral portion of side of head. Snout blunt to slightly pointed. Urogenital papilla cylindrical and short in males, pocket-shaped in females.

FIGURE 7. Simpsonichthys bokermanni , male, UFRJ 1836, topotype, about 35 mm SL mm SL; Brazil: Bahia: Ilhéus .

Tip of dorsal and anal fins pointed in males, rounded in females. Tip of dorsal and anal fins with filamentous rays in males, tip of dorsal-fin filaments reaching vertical just anterior to posterior margin of caudal fin, tip of anal-fin filaments reaching vertical through middle of caudal fin. Dorsal-fin rays unbranched. Caudal fin rounded. Pectoral fins elliptical. Posterior margins of pectoral fins reaching vertical through base of 7th anal-fin ray in males, and through base of 4th anal-fin ray in females. Tip of each pelvic fin reaching base of 3 rd anal-fin ray in males and base of 1st anal-fin ray in females. Pelvic-fin bases medially in contact. Dorsalfin origin on vertical through base of 8th anal-fin ray in both sexes; dorsal-fin origin between neural spines of vertebrae 12 and 13 in males, and vertebrae 11 and 12 in females. Anal-fin origin between pleural ribs of vertebrae8 and 9. Dorsal-fin rays 16-17 in males, 14-16 in females; anal-fin rays 23-26 in males, 22-23 in females; caudal-fin rays 24-27; pectoral-fin rays 12-13; pelvic-fin rays 6.

Frontal squamation E-patterned; E-scales overlapping medially; no scale anterior to H-scale. Supraorbital scales 2-3. Longitudinal series of scales 27; transverse series of scales 9-10; scale rows around caudal peduncle16. Contact organ on each scale of ventral portion of lateral surface of body in males. Small papillate contact organs on inner surface of dorsalmost ray of pectoral fin in males.

Cephalic neuromasts: supraorbital 6-8 + 4-5, parietal 2, anterior rostral 1, sometimes absent, posterior rostral 1, infraorbital 2 + 18-22, preorbital 2, otic 2, post-otic 4, supratemporal 1, median opercular 1, ventral opercular2, preopercular 16-17, mandibular 10-12, lateral mandibular 2-3, paramandibular 1. One or two neuromasts on center of each scale of lateral line. Two neuromasts on caudal-fin base.

Basihyal subtriangular, width about 65% of length; basihyal cartilage about 30% of total length of basihyal. Six branchiostegal rays. Second pharyngobranchial teeth 2-3. Gill-rakers on first branchial arch 3 + 11. Vomerine teeth absent. Dermosphenotic present. Ventral process of posttemporal long. Total vertebrae 28-29.

Coloration

Males. Sides of body pale orangish brown, with four to six longitudinal rows of greenish blue dots on dorsal portion; pale golden narrow bars on anterior portion of flank. Dorsal portion of head pale orangish brown, side pale greenish golden. Iris yellow, with dark brown bar through center of eye. Dorsal fin pale brownish red with white dots. Anal fin pale brownish red, sometimes with faint light blue dots on posterior portion. Caudal fin pale brownish red, with greenish white dots on dorsal half of fin; ventral half usually without dots, sometimes with minute white dots; posterior margin light blue. Pectoral fin hyaline. Pelvic fins pale brownish red.

Females. Side of body light purplish brown, with narrow and short pale greenish blue bars on anterior portion; usually one, rarely two rounded black spots on anterocentral region. Dorsum pale brown. Sides of head pale brown, opercular region greenish blue. Iris yellow, with dark gray bar through center of eye. Dorsal fin hyaline, with faint brown spots and pale blue dots. Anal fin pink, with blue dots on posterobasal region. Caudal fin hyaline, with faint blue dots on basal region. Pectoral and pelvic fins hyaline.

Distribution

Floodplains of rio Cachoeira, Estado da Bahia, northeastern Brazil (Fig. 4).

Habitat

Temporary pools within the Atlantic forest.

Trusted

Public Domain

MagnoliaPress via Plazi

Source: Plazi.org

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