Campellolebias intermedius, Wilson J. E. M. Costa, 2006

Wilson J. E. M. Costa, 2006, Taxonomy and phylogenetic relationships among species of the seasonal, internally inseminating, South American killifish genus Campellolebias (Teleostei: Cyprinodontiformes: Rivulidae), with the description of a new species., Zootaxa 1227, pp. 31-55 : 41-43

Campellolebias intermedius Costa & De Luca, new species

(Figs. 5-6)

Holotype. UFRJ 6312 , male, 23.9 mm SL; Brazil: Estado de São Paulo: temporary pool in road about 6 km W of Juquia , rio Juquia drainage, rio Ribeira de Iguape basin , about 24°20’S 47º35’W; A. C. De Luca et al., 27 Oct. 2002 .

Paratypes. Brazil: Estado de São Paulo: rio Ribeira de Iguape basin, rio Juquiá drainage: UFRJ 6313 , female, 20.7 mm SL; collected with holotype . UFRJ 6314 , 1 male, 20.8 mm SL; 1 female, 17.0 mm SL; UFRJ 6315 , 2 males, 19.1-22.9 mm SL; 2 females, 15.4-16.8 mm SL; temporary pool along road, about 3 km W of Juquia ; A. C. De Luca & C. G. C. Wenceslau, 25 Jan. 2003 .

Additional material (non types). UFRJ 6316 , 12 males, 16.6-20.6 mm SL, 21 females, 14.0-17.6 mm SL (in poor state of conservation, equivocally first fixed in 40 % ethyl alcohol just after collection); road about 3 km W of Juquia ; A. C. De Luca et al., 27 Oct. 2002 .

Diagnosis

Distinguished from C. dorsimaculatus in having: pelvic-fin bases medially separated by interspace (vs. in contact), iridescent marks arranged in horizontal rows on flanks in males (vs. iridescent dots arranged in vertical rows), dark chromatophores arranged in horizontal lines on flank in females (vs. arranged in vertically elongated spots), no dark brown bars on flanks in males (vs. 9-10 dark brown bars on flanks), no pale purple stripe on flanks of males (vs. two pale purple stripes), and no distinctive black spot on posterior portion of dorsal fin on posterior portion of dorsal fin (vs. black spot present). Distinguished from C. chrysolineatus and C. brucei by having dorsal and anal fins moderately long in males, tip reaching basal portion of caudal fin (vs. dorsal and anal fins long, reaching tip posterior half of caudal fin) and pelvic-fin tip reaching anterior base of pseudogonopodium in males (vs. reaching base of 4th anal-fin ray). Also distinguished from C. chrysolineatus by the absence of black spots on the flanks in females (vs. presence), and flank light reddish brown in males (vs. purplish pink). Also distinguished from C. brucei by having fewer supraorbital neuromasts (2 + 12 vs. 3 + 13-16), fewer anal-fin rays (14-16 vs. 16-18), and vertical golden lines on flanks in males (vs. vertical rows of metallic green spots).

Description

Morphometric data given in Table 1. Males larger than females, largest male 23.9 mm SL, largest female 20.7 mm SL. Dorsal profile convex from snout to end of dorsal-fin base, approximately straight on caudal peduncle. Ventral profile gently convex from lower jaw to end of anal-fin base, nearly straight on caudal peduncle. Body moderately slender, slightly compressed. Greatest body depth at level of pelvic-fin base.

Dorsal and anal fins pointed, slightly elongated, tip reaching vertical through basal portion of caudal fin in males, rounded and short in females. Caudal fin rounded. Pectoral fins elliptical. Posterior margin of pectoral fins reaching vertical between pelvic-fin base and anus in males, through vertical just in front pelvic-fin base in females. Tip of pelvic fins reaching anterior base of pseudogonopodial rays in males, reaching urogenital papilla in females. Pelvic-fin bases medially separated by interspace, with length equal to half pelvic-fin base width. Dorsal-fin origin anterior to anal-fin origin, anal-fin origin on vertical between base of 3rd dorsal-fin ray. Dorsal-fin origin between neural spines of vertebrae 11 and 12 in males, 9 and 10 in females. Anal-fin origin between pleural ribs of vertebrae 11 and 12 in males, between pleural ribs of vertebrae 11 and 12 in females. Dorsal-fin rays 15-17; anal-fin rays 2 + 13-14 in males, 14-16 in females; caudal-fin rays 25-27; pectoral-fin rays 14; pelvic-fin rays 6.

Scales large, cycloid. Body and head entirely scaled, except on anteroventral surface of head. Dorsal and anal-fin bases without scales. Scales covering anterior 10 % of caudal fin. Frontal squamation E-patterned, E-scales not overlapping. Longitudinal series of scales 26-27; transverse series of scales 7; scale rows around caudal peduncle 12. Three to five minute contact organ on exposed margin of each scale of ventral portion of flank in males. Minute papillate contact organs on internal surface of distal portion of four uppermost pectoral-fin rays in males.

Cephalic neuromasts: supraorbital 2 + 12, parietal 1, anterior rostral 1, posterior rostral 1, infraorbital 1 + 22-23, preorbital 2, otic 2, post-otic 2, supratemporal 1, median opercular 1, ventral opercular 1, preopercular 17-18, mandibular 8-9, lateral mandibular 3-4, paramandibular 1. Two to four neuromasts on each scale of lateral series. Transverse row of five neuromasts on caudal-fin base.

Basihyal triangular, longest width about 40 % of length; basihyal cartilage about 30 % of total length of basihyal. Six branchiostegal rays. Second pharyngobranchial absent. Gill-rakers on first branchial arch 2 + 8. Vomerine teeth absent. Dermosphenotic absent. Ventral process of posttemporal absent. Total vertebrae 26-28.

Coloration

Males: Sides of body light reddish brown, with 7 horizontal golden lines. Sides of head dark reddish brown, central portion of opercular region metallic green. Iris bright yellowish green, with dark reddish brown bar through center of eye. Dorsum brown. Venter white; dark brown stripe along ventrolateral region of head; dark brown midventral stripe from lower jaw to pseudogonopodium. Dorsal and anal fins light green, with small dark brown spots on basal and posterior portions, light blue with dark brown bars on distal and anterior portions; narrow submarginal black line and narrow bluish white marginal line along anterior edge of fins. Caudal fin light green, with small reddish brown spots. Pelvic fins dark bluish gray. Pectoral fins hyaline.

Females: Sides of body light yellowish brown, with 5-7 dark gray horizontal lines; small black spots on posterior portion of caudal peduncle. Venter white to pale golden. Opercular region greenish golden. Iris light yellow, with brown bar through center of eye. Unpaired fins hyaline, with small black spots on basal region, larger on caudal-fin base. Pectoral fins hyaline. Pelvic fins dark gray.

Distribution

Temporary pools in rio Juquiá drainage, rio Ribeira de Iguape basin, São Paulo, Brazil (Fig. 4).

Etymology

From the Latin intermedius (intermediate), referring to its phylogenetic position among congeners.