SOUTH AMERICAN CHARACID FISHES — WEITZMAN 149 



present or absent. (20) Anal fin short-based, with 8 to 14 rays. 

 Males often with specialized anal fin rays; these expanded in anterior- 

 posterior plane and often thickened laterally. (21) Dorsal fin always 

 in advance of anal fin, placed over pelvic fins. (22) Caudal fin 

 rounded or forked. (23) Scales large, 6 to 7 horizontal rows between 

 dorsal and pelvic fines, 18 to 30 scales in longitudinal series. 

 The tribes of subfamily Lebiasininae are: 



Lebiasinini Eigenmann, 1910 

 Pyrrhulinini Eigenmann, 1910 



TRIBE lEBIASININI EIGENMANN, 1910 



Noraenclatural note: Eigenmann (1910) was the first to base a 

 family group name, Lebiasininae, on the genus Lebiasina. Hoedeman 

 (1950b) was the first to propose the use of this family group name as 

 a tribe. 



Definition: (1) Four branchiostegal rays. (2) Premaxillary divided 

 into well-developed upper and lower rami. (3) Premaxillary teeth 

 tricuspid, in one row. (4) Dentary with teeth in two rows, outer row 

 teeth tricuspid, inner with simple, conic teeth. (5) Dentary without 

 inferior deep notch or groove, ventral surface smooth. (6) Parietal 

 branch of supraorbital sensory canal moderately well developed, 

 reaching almost to parietal bone. (7) Supratemporal laterosensory 

 canals present. (8) Dermopterotic laterosensory canals present. 

 (9) Extrascapular laterosensory canals and bones present. (10) 

 Supracleithrum with laterosensory canal. (11) Frontalpterotic joint 

 present on surface of skull. 



The genera of tribe Lebiasinini are: 



Lebiasina Valenciennes (1846), with two species. 

 Piabucina Valenciennes (1849), with six or seven species. 



Remarks: Lebiasina has been separated from Piabucina by the 

 absence of an adipose fin in the former and its presence in the latter. 

 This is apparently a poor character in these fishes, for, as Eigenmann 

 (1923, p. 123) noted, some specimens of Lebiasina bimaculata and 

 Lebiasina multimaculata occasionally have an adipose fin. In the 

 specimens I have been able to examine, the anterior wall of the 

 posterior division of the swimbladder in Lebiasina bimaculata and 

 Piabucina festae is "cellular" while in Piabucina erythrinoides and Pia- 

 bucina panamensis it is not. The tribe Lebiasinini needs revision at 

 the specific and generic level. 



TRIBE PYRRHULININI EIGENMANN, 1910 



Nomenclatural note: Eigenmann (1910) was the first to base a 

 family group name, Pyrrhulininae, on the genus Pyrrlndina. Hoede- 

 man (1954a) was the first to propose the use of this family group 

 name as a tribe Pyrrhulinini. 



