Cnesterodon decemmaculatus ( Jenyns, 1842 )

Lucinda, Paulo H. F., 2005, Systematics of the genus Cnesterodon Garman, 1895 (Cyprinodontiformes: Poeciliidae: Poeciliinae), Neotropical Ichthyology 3 (2), pp. 259-270 : 262-263

publication ID

https://doi.org/ 10.1590/s1679-62252005000200003

publication LSID

lsid:zoobank.org:pub:F943EF65-FFB0-47E9-B9E6-F6DFB1F2C61C

DOI

https://doi.org/10.5281/zenodo.10064085

persistent identifier

https://treatment.plazi.org/id/3A295067-FFB4-6651-C5B7-E6883447FB5D

treatment provided by

Carolina

scientific name

Cnesterodon decemmaculatus ( Jenyns, 1842 )
status

 

Cnesterodon decemmaculatus ( Jenyns, 1842) View in CoL

( Fig. 3 View Fig )

Poecilia decem-maculata Jenyns, 1842: 115 View in CoL , Plate 22. fig. 1, 1a.

Type -locality: Maldonado [ Uruguay]. BMNH 1917.7.14 : 25, lectotype [by present designation]; BMNH 1917.7.14 : 26, paralectotype. Maldonado. C. Darwin .

Poecilia gracilis Valenciennes View in CoL in Cuvier & Valenciennes, 1846: 133.

Type -locality: environs de Montevidéo [ Uruguay]. MNHN B-0939 .

Diagnosis. Cnesterodon decemmaculatus is diagnosed by the following autapomorphies: (1) bony style at gonopodium tip of large adult males relatively long, slightly arched, and covered by a wide membrane progressively narrowing towards tip forming a distal filament ( Rosa & Costa, 1993; fig. 10); (2) membranous tip anterior to R4 and R5 absent [111-0]; and (3) membranous tip anterior to R4 and R5 absent [112-0].

Furthermore, C. decemmaculatus is readily distinguished from C. omorgmatos and C. raddai by dark brown blotches along body sides (forming bars vs. circular or irregular, respectively). Cnesterodon decemmaculatus is distinguished from C. carnegiei , C. hypselurus , and C. septentrionalis by dark bars on sides of body, mostly confined to midline, covering less than three scales in a transverse row, never extending to dorsal and ventral profiles (vs. dark bars of body very elongate reaching dorsal and ventral profiles, covering more than four scales in a transverse row). The absence of small scales covering lateral and ventral region of body below pectoral fin in adult females and the pointed snout distinguishes C. decemmaculatus from C. brevirostratus . Cnesterodon decemmaculatus is readily distinguished from C. iguape by the smaller post -gonopodium blotch on the ventral profile in adult males.

Distribution. Lower rio Uruguay, laguna dos Patos system, Río Negro, Río Salado, western drainages of Argentina and small coastal drainages of Uruguay and Argentina ( Fig. 1 View Fig ).

Remarks. See Lucinda (2003) for discussion of type-locality.

Kingdom

Animalia

Phylum

Chordata

Order

Cyprinodontiformes

Family

Poeciliidae

Genus

Cnesterodon

Loc

Cnesterodon decemmaculatus ( Jenyns, 1842 )

Lucinda, Paulo H. F. 2005
2005
Loc

Poecilia gracilis

Valenciennes 1846
1846
Loc

Poecilia decem-maculata

Jenyns 1842: 115
1842
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