337 



Ageneiosus marmoratus Eigemnann 



Fig. 57 

 "'^ -., Table 26 : 



Ageneiosus marmoratus Eigenmann 1912:206, pi. 22, fig. 1 (original description [type 

 locality: creek below Potaro Landing, British Guiana { = Guyana}]). Henn 

 1928:74 (holotype listed). Shelden 1937:26, 30-32, 50-54, 71, 77-89 (osteology 

 and myology of pelvic girdle; evolutionary relationships with other famiUes). 

 Gosline 1945:25 (citation). Britski 1972:99, 108 (citation). Ibarra and 

 Stewart 1987:6, 86 (holotype listed). Ferraris 1988:64, 69, 71, 125, 127, 151 

 (citation; presence of cleithral spine in juvenile; ontogenetic change of tripus 

 and elastic spring apparatus). Burgess 1989:286 (citation). 



Ageneiosus dawala: Puyo 1949:93-94, fig. 51 (synonymy [based at least in part on A. 

 brevifilis]; description; color in life; habitat). 



Ageneiosus barranquerensis Risso and Risso 1964:10-12, 27 (original description 

 [type locality: Rio Negro, Riacho Barranqueras, Argentina]). Ferraris 

 1988:127 (citation). „ . . . 



Diagnosis " - ■ f \ 



A handsome catfish distinguished from all other species by its striking 

 coloration pattern, consisting of large, irregular, and sharply contrasting black 

 blotches on the head, body, and fins. Further characterized by a combination of its 

 large, robust head; a broad, parabolic snout and wide gape; an emarginate tail with 

 8+10 principal caudal rays; the first dorsal and pectoral lepidotrichia flexible, 

 segmented, and unserrated; short, conical gill rakers; and high numbers of pectoral 

 rays, branchiostegals, and ribs. y ' ^ 



Description 



Size comparatively small, all known specimens less than 185 mm SL. 

 Proportional measurements of the species are summarized in Table 26. 



