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Klassificering / Namn Populärnamn | synonymer | Catalog of Fishes(Släkte, Arter) | ITIS | CoL | WoRMS | Cloffa
> Cyprinodontiformes (Rivulines, killifishes and live bearers) > Rivulidae (Rivulines) > Rivulinae
Etymology: Rivulus:Latin, rivus = stream (Ref. 45335); tomasi:Named for the German aquarist, adventurer and fish collector Joachim Tomas, co-collector of the species during a survey in 2010. Eponymy: Joachim ‘Charly’ Tomas (1963–2012) was a German killifish hobbyist, aquarist, conservationist, adventurer and fish collector. [...] (Ref. 128868), visit book page.
Könsmognad: Lm? range ? - ? cm Max length : 3.7 cm SL hane/ej könsbestämd; (Ref. 94444); 3.2 cm SL (female)
Kort beskrivning Bestämningsnycklar | Morfologi | Morfometri
Mjukstrålar i ryggfenan (totalt) : 8 - 9; Mjukstrålar i analfenan: 13 - 14. This species is distinguished by the following characters: males with red longitudinal stripes between the rays of the caudal fin, yellow stripe near dorsal and ventral fin margin; females possess brown spots between caudal fin rays; pelvic fins in males moderately long, reaching between 4th and 5th anal fin ray; fin rays, dorsal 8-9, anal 13-14; caudal 30-32; lateral scale rows 39-42 (Ref. 94444). Body shape (shape guide): elongated; Cross section: oval.
Collected alongside a fast running part of a creek that flows down a boulder-strewn area, with a fall of approximately one in every five meters, a place where people find leisure and can slide down the rocky face. This rocky open area is surrounded by a primary forest. This species lives between tree roots and fallen leaves attached to boulders at the edges of the stream, and between boulders. It was also collected a in places where the water ran slower, but was not found in still water surrounding the rocky waterslide. At the time of collection (September 2006), the water at the collecting site was clear, pH 7, 27.6°C, conductivity was <1 μS/cm. (Ref. 94444).
Vermeulen, F.B.M., S. Valdesalici and J.R. Garcia-Gil, 2013. Rivulus tomasi (Teleostei: Cyprinodontiformes: Rivulidae), a new killifish from Tobogán de la Selva, middle Orinoco river drainage in the Amazonas Territory, southwest Venezuela. aqua, Int. J. Ichthyol. 19(4):187-192. (Ref. 94444)
Status på IUCN:s rödlista (Ref. 130435: Version 2025-2 (Global))
