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> Cyprinodontiformes (Rivulines, killifishes and live bearers) > Rivulidae (Rivulines) > Cynolebiinae
Eponymy: Dr George Sprague Myers (1905–1985), an American ichthyologist, bio-geographer and herpetologist, was Professor Emeritus of Biological Sciences at Stanford, California. [...] (Ref. 128868), visit book page.
Ambiente: milieu / zona climatica / distribuzione batimetrica / gamma di distribuzione Ecologia
South America: Atlantic coastal river basins in Brazil.
Dimensione / Peso / Età
Maturità: Lm? range ? - ? cm Max length : 6.0 cm TL maschio/sesso non determinato; (Ref. 36579)
Breve descrizione Chiavi di identificazione | Morfologia | Morfometria
Raggi dorsali molli (totale) : 12 - 18; Raggi anali molli: 19 - 23; Vertebre: 28 - 29. Xenurolebias myersi differs from all other congeners by having the caudal fin sub-lanceolate, never forming a distinctive tip posteriorly in larger individuals (vs. lanceolate, with a pronounced posterior tip) and distinctive light yellow spots on the distal portion of the anal fin in males (vs. light yellow narrow bars). It is also distinguished from X. cricarensis and X. izecksohni in having fewer dark brown bars on the caudal fin in males (4-6, vs. 7-10 in X. cricarensis and 9-12 in X. izecksohni); from X. izecksohni by having fewer dark grey bars on the flank in females (9-11 vs. 12-13), the dorsal fin, in males, with short light bars on the basal portion and small round light spots on the distal portion (vs. branching bars), absence of oblique short bars on the ventral portion of the caudal fin in males (vs. presence), deeper body (29.0-31.4% SL in males and 30.1-33.9% in females, vs. 27.1-28.5% and 28.5-30.6%, respectively), and longer lower jaw (22.4-24.5% of head length in males and 19.6-21.4% iin females, vs. 18.6-20.9% and 17.7-19.7%, respectively); and from X. pataxo in having wider head (71.5-74.6% SL in males and 74.5-81.1% in females, vs. 65.7-71.1% and 65.8-70.3%, respectively), shorter filaments on the dorsall fin in males (reaching between base and middle of the caudal fin, vs. reaching posterior portion of the caudal fin), and the presence of black spots on the posterior part of the caudal peduncle in females (vs. absence) (Ref. 96072).
Body shape (shape guide): fusiform / normal.
Found in seasonal pools as well as river floodplains (Ref. 96072). Bottom spawner, 4 months incubation. Is difficult to maintain in aquarium (Ref. 27139).
Ciclo vitale e comportamento di accoppiamento Maturità | Riproduzione | Deposizione | Uova | Fecondità | Larve
Costa, W.J.E.M. and P.F. Amorim, 2014. Integrative taxonomy and conservation of seasonal killifishes, Xenurolebias (Teleostei: Rivulidae), and the Brazilian Atlantic forest. Systematic and Biodiversity (Ref. 96072)
Stato della Lista Rossa IUCN (Ref. 130435: Version 2025-2 (Global))
Endangered (EN) (B1ab(iii,iv,v)+2ab(iii,iv,v)); Date assessed: 07 November 2018
Dinamica della popolazione Parametri di crescita Età massima / dimensioni massime Rapporto lunghezza-peso. Lunghezza-lunghezza rel. Lunghezza-frequenze Conversione di massa Reclutamento Abbondanza
Ciclo di vita Riproduzione Maturità Maturità/Gli occhielli sono relativi. Fecondità Deposizione Aggregazioni riproduttive Uova Sviluppo delle uova Larve Dinamica popolazioni larvali
Fisiologia Composizione corporea Nutrienti Consumo di ossigeno Tipo di nuoto Velocità di nuoto Pigmenti visivi Suono del pesce Malattie e parassiti Tossicità (LC50)
