Charax, Scopoli, 1777

Menezes, Naércio A. & de Lucena, Carlos Alberto S., 2014, A taxonomic review of the species of Charax Scopoli, 1777 (Teleostei: Characidae: Characinae) with description of a new species from the rio Negro bearing superficial neuromasts on body scales, Amazon basin, Brazil, Neotropical Ichthyology 12 (2), pp. 193-228: 195-197

publication ID

http://doi.org/ 10.1590/1982-0224-20130175

publication LSID

lsid:zoobank.org:pub:2CFAB1CE-D283-483B-8C2B-87D95AEADE70

DOI

http://doi.org/10.5281/zenodo.4638999

persistent identifier

http://treatment.plazi.org/id/03C4D938-3478-3F46-FC11-FED8FCC164EA

treatment provided by

Carolina

scientific name

Charax
status

 

Key to species of Charax 

1a. Lateral line incomplete, represented by anterior short segment; dorsal region of body anterior to dorsal fin origin lacking scales ........................................................................ 2

1b. Lateral line complete, perforated scales extending to base of caudal fin; dorsal region of body anterior to dorsal fin origin entirely covered with scales, except for small predorsal naked area ............................................................ 3

2a. Scale rows from pelvic-fin origin to lateral line 6-9 ......... 4

2b. Scale rows from pelvic-fin origin to lateral line 11-12 ............................................................. Charax hemigrammus 

3a. Perforated scales on lateral line 42-44; 12 scale rows around caudal peduncle ...................................... Charax rupununi 

3b. Perforated scales on lateral line 50-65; 15-22 scale rows around caudal peduncle ...................................................... 5

4a. Ectopterygoid teeth present; 30-41 teeth on posterior dentary row .................................................. Charax condei 

4b. Ectopterygoid teeth absent; 18-28 teeth on posterior dentary row ......................................... Charax stenopterus 

5a. Anal-fin origin along or slightly posterior to,vertical through origin of dorsal fin; ectopterygoid teeth always present ................................................................................... 6

5b. Anal-fin origin always anterior to vertical through origin of dorsal fin; ectopterygoid teeth absent (except in some specimens of Charax gibbosus  ) ........................................ 8

6a. Superficial neuromasts absent on body; 9-10 gill rakers on lower branch of first gill arch ..................... Charax tectifer 

6b. Superficial neuromasts present, especially visible on trunk scales ( Figs. 1View Fig and 2); 7-9 (rarely 9) gill rakers on lower branch of first gill arch ......................................................... 7

7a. Total number of ectopterygoid teeth 20-50; humeral spot distance 41.6-47% of SL ( Fig. 3View Fig); 7-9 transverse scale rows between humeral spot and supracleithrum ......................................................................... Charax metae 

7b. Total number of ectopterygoid teeth 3-15; humeral spot distance 48-51% of SL ( Fig. 3View Fig); 10-12 transverse scale rows between humeral spot and supracleithrum ...................................................................... Charax delimai 

8a. Orbital diameter 25-28.5% of head length ( Fig. 4) ……… 9

8b. Orbital diameter 30.1-38.4% of head length ( Fig. 4) …… 10

9a. Snout length 20.3-22.8% of head length ( Fig. 5View Fig); 16-17 scale rows from dorsal-fin origin to lateral line; 9-13 scale rows from anal-fin origin to lateral line ....................................................... Charax caudimaculatus 

9b. Snout length 24.3-26.3% of head length ( Fig. 5View Fig); 18-19 scale rows from dorsal-fin origin to lateral line; 14-17 scale rows from anal-fin origin to lateral line .................................................................... Charax notulatus 

10a. Scale rows around caudal peduncle 20-22 .................... 11

10b. Scale rows around caudal peduncle 16-19 ................... 12

11a. Perforated scales on lateral line 54-62 ....................................................................... Charax apurensis 

11b. Perforated scales on lateral line 63-65 .................................................................. Charax macrolepis 

12a. Humeral spot distance 34.7-37.8% of standard length ( Fig. 3View Fig); 4-6 transverse scale rows between humeral spot and supracleithrum ............................................................. 13

12b. Humeral spot distance 38-44% of standard length ( Fig. 3View Fig); 8-10 transverse scale rows between humeral spot and supracleithrum ....................................................................... 14

13a. Scale rows from dorsal-fin origin to lateral line 18-20 ..................................................................... Charax michaeli 

13b. Scale rows from dorsal-fin origin to lateral line 15-16 ... 15

14a. Scale rows from dorsal-fin origin to lateral line 3-14 ............................................................ Charax pauciradiatus 

14b. Scale rows from dorsal-fin origin to lateral line 16-18 ....................................................................... Charax leticiae 

15a. Predorsal scales 38-45; ectopterygoid teeth present in most specimens examined ....................... Charax gibbosus 

15b. Predorsal scales; ectopterygoid teeth absent in all specimens examined 52-68 ............................. Charax niger