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Characiformes (Characins) >
Stevardiidae (Stevardiids) > Xenurobryconinae
Etymology: Ptychocharax: Greek, ptyx, -ychos = fold + Greek, charax = a marine fish without identification (Ref. 45335).
More on authors: Weitzman, Fink, Machado-Allison & RoyeroL..
Issue
Weitzman et al. (1994). See Weitzman & Menezes (1998) for relationships. See Burns et al. (1995) for evidence of insemination.
Environment: milieu / Klimaatzone / Diepte / distribution range
Ecologie
; zoet water pelagisch. Tropical
South America: Upper Siapa River in Casiquiare River drainage in Venezuela.
Grootte / Gewicht / Leeftijd
Maturiteit: Lm ?  range ? - ? cm
Max length : 6.2 cm SL mannelijk / geslacht onbekend; (Ref. 26734)
Inhabits clear streams with sand and granitic rocks bottoms covered by dense mats of the plant Apinaga multibranchiata (Podostemaceae) in areas of fast water. Feeds on larvae of aquatic insects such as simuliids and trichopterans that were found among the podostemacean plants. A few ants and spiders were also found in the stomachs.
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
Weitzman, S.H., S.V. Fink, A. Machado-Allison and R. Royero L., 1994. A new genus and species of Glandulocaudinae (Teleostei: Characidae) from southern Venezuela. Ichthyol. Explor. Freshwat. 5(1):45-64. (Ref. 26734)
Status op de Rode Lijst van het IUCN (Ref. 130435: Version 2025-1)
Gevaar voor de mens
Harmless
Gebruik door de mens
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Estimates based on models
Fylogenetische diversiteitsindex (Ref.
82804): PD
50 = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00955 (0.00443 - 0.02057), b=3.06 (2.88 - 3.24), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trofisch niveau (Ref.
69278): 3.3 ±0.42 se; based on food items.
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
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