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Characiformes (Characins) >
Stevardiidae (Stevardiids) > Diapominae
Etymology: Monotocheirodon: Greek, monos = one + Greek, cheir = hand + Greek, odous = teeth (Ref. 45335); duda: Named after its type locality, collected mostly tributaries to the Duda River or captured in the Duda River itself (type locality). In Spanish, the epithet specific 'duda' means doubt, which also refers to its presumed placement into the genus Monotocheirodon, an assumption that needs further
evaluation.
Meio ambiente: milieu / Zona climática / intervalo de profundidade / faixa de distribuição
Ecologia
; Água doce bentopelágico; intervalo de profundidade 0 - 1 m (Ref. 132484). Tropical
South America: Colombia.
Tamanho / Peso / Idade
Maturidade: Lm ?  range ? - ? cm
Max length : 3.1 cm SL macho/indeterminado; (Ref. 132484); 2.5 cm SL (female)
Descrição suscinta
Chaves de identificação | Morfologia | Morfometria
Raios dorsais (total) : 7; Raios anais : 11 - 13; Vértebras: 36 - 37. The species is distinguished from all Stevardiinae species by the following set of characters: adult males with enlarged urogenital papilla (length about one-third to half of the first unbranched ray), which is in contact with the first anal-fin unbranched ray and a highly modified anal fin, with enlarged (anteroposteriorly) and distally elongated first and second branched anal-fin rays, forming a gonopodium-like structure; differs from its congenerspresence of an adipose fin (vs. absent); lateral line incomplete, pored scales not reaching the caudal fin (vs. lateral line complete); ascending process of the premaxilla dorsally directed (vs. strongly bent posteroventrally); snout longe, about a fourth of the head length (HL), between 23.1%- 30.0% of HL (vs. short snout, <20% of the HL) (Ref. 132484).
Cross section: compressed.
Occurs in shallow waters (< 1 m) of large-to-medium-size streams (< 70 m width) of clear-to-chalky silt colored waters of moderate flow running over sand, pebbles, and rock substrates. Stomach contents include mainly periphytic algae (Bacillariophyceae—Diatoms, Cyanophyceae, Zygnematophyceae, and Rhodophyceae) and rarely some macroinvertebrates (Diptera: Chironomidae larvae); sand grains were also abundant. Associated fish collected which are restricted to the Guaviare River basin include: Creagrutus maculosus, Chrysobrycon guahibo, Tyttocharax metae, Trichomycterus migrans and Schultzichthys gracilis; while other widely distributed species (in the Orinoco basin) were Astyanax metae, Hemibrycon metae, Hemigrammus barrigonae, Knodus cismontanus, Knodus deuterodonoides, Apteronotus galvisi, Cetopsorhamdia orinoco, Chaetostoma chimu, Characidium cf. boavistae, Characidium chupa, Parodon apolinari, Prochilodus mariae, Salminus iquitensis (Ref. 132484).
Ciclo de vida ou comportamento de acasalamento
Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas
Carvalho, T.P., A.T. Thomaz, A. Urbano-Bonilla and S. Prada-Pedreros, 2024. A new characid species with remarkable sexual dimorphism (Characiformes: Characidae: Stevardiinae) from the upper Guayabero River, Orinocobasin, Colombia. J. Fish Biol. 104(6):1947-1959. (Ref. 132484)
Status na Lista Vermelha da UICN (Ref. 130435: Version 2025-2 (Global))
Ameaça para os humanos
Harmless
Uso pelos humanos
Pescarias: sem interesse
Ferramentas
Relatórios especiais
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Fontes da internet
Estimativas baseadas em modelos
Índice de diversidade filogenética (Ref. 82804) |
PD50 = 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.01259 (0.00551 - 0.02875), b=3.01 (2.82 - 3.20), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
Nível Trófico (Ref. 69278) |
2.9 ±0.3 se; based on size and trophs of closest relatives |
Vulnerabilidade da pesca (Ref. 59153) |
Low vulnerability (10 of 100). 🛈 |