2S9 



Ageniosus dentatus: Giinther 1864:192, 432 (partial synonymy; brief description). 



Ageneiosus porphyreus Cope 1867:404 (original description [type locality: Surinam]; 

 allied to A. dentatus). Eigenmann and Eigenmann 1888:150 (citation); 

 1890:301, 309 (in key; citation); 1891:35 (citation). Eigenmann 1909:322 

 (listed in table; Surinam). Fowler 1915:224 (holotype listed; suggested to be 

 synonymous vnth A. guianensis). Gosline 1945:24 (citation). Britsld 

 1972:99,109 (citation). Ferraris 1988:124 (citation; misspelled po/p/ivmj). 

 Burgess 1989:286 (citation). 



Ageneiosus pamaguensis Steindachner 1910:399-401 (original description [type 



locality: Rio Parnagua, Piauf, Brazil]). Gosline 1945:25 (citation). Fowler 

 1951:453 (partial synonymy; distribution). Britski 1972:99, 109 (citation). 

 Ferraris 1988:125 (citation). Burgess 1989:286 (citation). 



Ageneiosus guianensis Eigenmann 1912:204-205, pi. 21, fig. 2 (original description 

 [type locality: Wismar, British Guiana { = Guyana}]). Henn 1928:74 

 (holotype listed). Goshne 1945:24 (citation). Britski 1972:99, 107 (citation). 

 Ibarra and Stewart 1987:6, 86 (holotype listed). Ferraris 1988:125, 127, 151, 

 figs. 33, 36 (citation; swimbladder encapsulation; gill arch elements; hyoid 

 apparatus). Burgess 1989:286 (citation). 



Ageneiosus caucanus: Burgess 1989:628 (photograph [misidentified]). 



Diagnosis 



Readily distinguished from other species of the genus by a combination of 

 the deeply forked tail, a very elongate, compressed body, a greatly flattened head 

 with a distinctly inferior mouth, and a very long anal fin. Pigmentation variable, the 

 typical pattern, consisting of dark stripes along the cranial fontanelle, an hourglass- 

 shaped patch on the nuchal plate, and a thin middorsal stripe along the back fi-om - 

 behind the rayed dorsal fin and extending onto the base of the upper caudal lobe, 

 further serves to distinguish this species from congeners. The high number of anal 

 fin rays (41-50), and numerous (18-25), long, crenulated gill rakers on the first arch 

 separatesy4.Mcayafe/ty£y from all other species. , - ■ j r 



