A systematic revision of the genus Archocentrus (Perciformes: Cichlidae), with the description of two new genera and six new species. Author Juan J. Schmitter-Soto text Zootaxa 2007 1603 1 78 http://www.zoobank.org/urn:lsid:zoobank.org:pub:AFFCB590-1FC7-4CD0-950C-D1D1A6E59F6C journal article z01603p001 Key to Archocentrus and allied genera 1a Maxilla very protractile; ascending process of premaxilla extending beyond orbit, contained ininterorbital groove; caudal fin profile strongly rounded .............................................................. Caquetaia 1b Maxilla and premaxilla not as above; caudal fin profile, if rounded, not as strongly as above ......... 2 2a(1b) Caudal fin emarginate ................................................................................................... Hypsophrys (8) 2b Caudal fin rounded or (sub)truncate ................................................................................................. ..3 3a(2b) Genital papilla long, contours mostly parallel, as seen from rostral face, terminal notch rounded; upper symphysial teeth abruptly larger than adjacent teeth; lower symphysial teeth smaller than adjacent teeth, which are enlarged; frenum on lower lip absent ....................................... Parachromis 3b Genital papilla not as above; outer teeth on upper jaw gradually increasing in size anteriorly (symphysial teeth abruptly larger in Rocio , Amatitlania , and some Cryptoheros ); frenum on lower lip present or absent ............................................................................................................................. 4 4a(3b) Frenum on lower lip absent; total gill-rakers on first arch 14-20; pharyngeal plate longer than wide. ......................................................................................................................................... Amphilophus 4b Frenum present in lower lip or absent; total gill-rakers on first arch 7-15; pharyngeal plate about as wide as long, or wider.........................................................................................................................5 5a(4b) Lateral stripe extending from snout to a blotch on mid-body; eight bars on sides; ocellated spot on caudal fin, dorsal to lateral line; lower jaw usually extending beyond upper jaw.................. Rocio (9) 5b Lateral stripe absent; usually 6-7 bars on side of body; caudal blotch, if present, not ocellated, not entirely dorsal to lateral line, or not entirely on fin; mouth usually terminal......................................6 6a(5b) First bar on side of body Y-shaped, caudal arm discontinuous; caudal blotch on fin (sometimes obsolete) .......................................................................................................................... Amatitlania (11) 6b First bar on side of body I- or V-shaped (may be Y-shaped in some Cryptoheros , but caudal arm continuous); caudal blotch usually on peduncle (may lie on fin in some Cryptoheros )......................7 7a(6b) A. IX-XII; genital papilla oval, in females opening strongly crenulated; two interorbital bands......... .................................................................................................................................. Archocentrus (14) 7b A. VI-IX; genital papilla not as above; no interorbital bands................................... Cryptoheros (16)