Austrolebias adloffi (Ahl)

M Costa, Wilson J. E. & Cheffe, Morevy M., 2001, THREE NEW ANNUAL FISHES OF THE GENUS Austrolebias FROM THE LAGUNA DOS PATOS SYSTEM, SOUTHERN BRAZIL, AND A REDESCRIPTION OF A. adloffi (AHL) (CYPRINODONTIFORMES: RIVULIDAE), Comun. Mus. Ciênc. Tecnol. PUCRS, Sér. Zool. 14 (2), pp. 179-200 : 190-191

Austrolebias adloffi (Ahl)

( Figs. 8-9 )

Cynolebias adloffi Ahl, 1922: 224 (original description, Porto Alegre [Estado do Rio Grande do Sul, Brazil).

Material examined. Brazil. Rio Grande do Sul. MZUSP 38376 , 9 ex., São Leopoldo, bairro Santos Dumont , rio dos Sinos basin; T. P. Lacerda, 20 Dec. 1979 . - MZUSP 38411 , 8 ex.; Porto Alegre; unknown collector, Jun. 1986 . — MCP 10288 , 8 of 12 ex.; Canoas, distrito de Mato Grande, rio dos Sinos basin; C. A. Lucena, J. J. Bertoletti and L. R. Malabarba, 17 Oct. 1984 . - MCP 10933 , 22 of 30 ex. (3 c&s); Gravataí, flooded area in distrito de Alvorada , rio Gravataí basin; L. R. Malabarba, R. Reis, P. Azevedo and L. Bergmann, 9 Jul. 1986 . - MNRJ 11393 , 2 ex; São Leopoldo, road BR- 116; T. Lacerda, 18 Oct. 1967 .

Diagnosis. Similar to A. charrua , A. minuano and A. nigrofasciatus , and distinguished from all other species of the genus by possessing two apomorphic color patterns: body side of male bright gray with dark gray to black stripes (vs. light gray or no stripes) and a vertically paired black blotch on the end of the caudal peduncle of female (vs. small spots irregularly arranged, or a single round dorsally positioned spot, or no spots on caudal peduncle). lt differs from A. minuano , A. charrua and A. nigrofasciatus by female having the dorsal-fin origin posterior to the anal-fin origin (vs. anterior to anal-fin origin), a modal number of anal-fin rays in female, 24 (vs. 22 in A. charrua and A. minuano , and 21 in A. nigrofasciatus ; Table 5), and dark vertical stripes narrower than interspace on body sides of male (vs. usually equal or wider than interspaces). It is also distinguished from A. charrua by having fewer supraorbital neuromasts (16- 19 vs. 19-24), fewer caudal-fin rays (21 -22 vs. 23 -26). and fewer scales on the longitudinal series (26-28 vs. 28 -30), and from A. minuano by fewer second pharyngobranchial teeth (2- 5 vs. 6-7).

Description. Morphometric data are given in Table 3. Male larger than female, reaching at least 45.9 mm SL. Dorsal profile convex between snout and end of dorsal-fin base, approximately straight on caudal peduncle. Protuberance on interorbital region of adult specimens of both sexes, more prominent in male. Ventral profile convex from lower jaw to end of anal-fin base, nearly straight on caudal pcduncle. Body rather deep, compressed, body width approximately 2.2 in body depth in larger males. Longest body depth at vertical through anal-fin origin. Snout blunt, jaws short.

Tip of dorsal and anal fins rounded. Border of membrane of anterior portion of dorsal fin of male not distinctively indented. Anteromedian rays of anal fin of female lengthened, resulting in approximately triangular fin shape. Urogenital papilla of male not attached to anal fin. Caudal fin rounded. Pectoral fin elliptical. Posterior margin of the pectoral fin reaching vertical between base of fifth and sixth anal-fin ray in male, and urogenital papilla and base of second anal-fm ray in female. Tip of pelvic fin reaching base of third anal-fin ray. Pelvic fins medially united along proximal half. Dorsal-fin origin at vertical through base of second anal-fin ray in male, and through base of first or second anal-fin ray in female. Dorsal-fm rays: 21 -24 in male, 18 -22 in female. Anal-fm rays: 26 -30 in male, 23 - 26 in female. Caudal-fin rays: 21 -22. Pectoral-fin rays: ll-12. Pelvic-fin rays 5 -6.

Figures

Figure 8. Austrolebias adloffi (Ahl), male, 33.7 mm SL, MCP 10933.

Figure 9. Austrolebias adloffi (Ahl), female, 31.9 mm SL, MCP 10933.