| Species: | Austrolebias periodicus |
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| Description: | Costa, 1999 | |
| Etymology: | The name periodicus refers to the annual life cycle. | |
| References: | Costa, W.J.E.M. (1999) Cynolebias periodicus, a new annual fish from the rio Ibicuí drainage, southern Brazil (Cyprinodontiformes, Rivulidae). Ichthyol. Explor. Freshwaters, 1999, 10 (4) : 297-302 THE Austrolebias alexandri SPECIES GROUP: A TAXONOMICAL REVISION OF AN ANNUAL FISH CLADE (CYPRINODONTIFORMES: RIVULIDAE). Wilson J. E. M. Costa; Volume 15 - 2002, Comunicações do MCT. |
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| Abstract: | Cynolebias periodicus, new species is described from the temporary floodplains of the rio Santa Maria, a tributary of the rio Ibicuí, rio Uruguai basin, Estado do Rio Grande do Sul, Brazil. It is considered to be closely related to C. nigripinnis, C. affinis, C. gymnoventris and C. cyaneus, with which it shares dorsal-fin origin anterior to anal-fin origin and a predominantly dark gray to black clororation in male. It is distinguished by the combination of characters involving head shape, recuced contact organs in scales, scaled venter and opercular region, and color pattern of body and fins of male. Member of the clade Austrolebias alexandri species group (Costa). |
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| Type Locality: | Location along road BR-293, 4km west of Dom Pedrito, rio Uruguai basin, rio Ibicuí drainage, remporary floodplains of the rio Santa Maria, Estado do rio Grande do Sul, Brazil. |
| Distribution: | Drainage of the Rio Ibicui basin, Rio Uruguay basin, S. Brazil. |
| Biotope: | Collected in a vast, seasonally flooded area close to rio Santa Maria. It was the only fish found, particularly abundant in shallow areas about 50 cm deep. The water was somewhat turbid and the aquatic vegetation was dense. |
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| Breeding: | Bottom spawner. |
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