Hisonotus francirochai ( Ihering, 1928 )

Reia, Lais, S. da Costa e Silva, Gabriel, Garcia-Ayala, James R., P. F. Vicensotto, Ana Maria & Benine, Ricardo C., 2020, Ichthyofauna of the ribeirão Sucuri, a tributary of the rio Tietê, upper rio Paraná basin, southeastern Brazil, Check List 16 (3), pp. 711-728 : 722

Hisonotus francirochai ( Ihering, 1928)

Figure 3 AB

Original description. Otocinclus francirochai Ihering 1928: 2 .

Material examined. BRAZIL • 52, 19.4−29.3 mm SL; São Paulo state, Pongaí, Córrego Santa Rosa ; 21°46′29″S, 049°23′34″W; 12 May 2018; leg. Silva G.S.C. and Reia L. (LBP 26471) • 1, 31.5 mm SL; São Paulo state, Pon- gaí, Córrego Zanata ; 21°47′02″S, 049°22′44″W; 12 May 2018; leg. Silva G.S.C. and Reia L. (LBP 26483) .

Identification. Body elongated; mouth ventral; maxil- lary barbel short, slender and free distally; teeth slender and bicuspid, central cusp larger than lateral; premax- illa with 17 to 21 teeth; dentary with 16 to 22 teeth. Body covered by odontodes; odontodes of snout larger in size than remaining in head; tuft of enlarged odontodes on posterior tip of parieto-supraoccipital; odontodes on head and trunk well defined, randomly arranged; body completely covered by bone plates, median series 24 or 25 perforated plates by lateral line; cleithrum and cora- coid completely exposed; abdomen partially covered by plates; lateral abdomen plates larger and forming regu- lar rows of three or four elongated plate on each sides; median abdominal plate absent; small anal plates pres- ent. Overall body coloration darkened; dorsal, anal, pec- toral, and pelvic fins hyaline; caudal fin black with two rounded hyaline areas, large on dorsal and small on ventral lobes.