| Characidae (Characins; tetras), subfamily: Cheirodontinae |
| 3.98 cm SL (male/unsexed) |
|
benthopelagic; freshwater |
| South America: Rio Tocantins-Araguaia basin in Brazil. |
|
Dorsal spines (total): 10-11. Serrapinnus tocantinensis is distinguisged from its congeners by the elongation of the unbranched dorsal and pelvic-fin rays into filaments in mature males. It differs further from S. sterbai by the absence of a continuous mid-lateral black stripe extending from the opercular region to the caudal-peduncle spot. It can be separated from other congeners by having the following characters: 9 to 11 cusps in the premaxillary teeth (vs. 5 in S. microdon and S. potiguar, 7 in S. aster, 7 to 9 in S. calliurus, S. heterodon, S. kriegi, S. micropterus, S. notomelas and S. piaba and 10 to 12 in S. gracilis and S. littoris); dentary teeth without expanded cusps forming a sharp cutting edge (vs. dentary teeth with expanded cusps forming a sharp cutting edge in S. heterodon); hyaline dorsal fin (vs. with a proximal black blotch in S. notomela; and black spot absent on the posteroventral region of the abdomen (vs. present in S. kriegi) (Ref. 96959).
Description: Dorsal-fin rays ii,8-9; anal-fin rays iii-iv,15- 21; pectoral-fin rays i,9-11; pelvic-fin rays i,6-7; scale rows between lateral line and pelvic-fin origin 4 or 5 (Ref. 96959). |
|
|
Least Concern (LC); Date assessed: 07 November 2018 Ref. (130435)
|
| harmless |
Source and more info: www.fishbase.org. For personal, classroom, and other internal use only. Not for publication.
