Classificação / Nomes
Nomes comuns | Sinónimos | Catalog of Fishes(Género, Espécies) | ITIS | CoL | WoRMS | Cloffa
>
Characiformes (Characins) >
Acestrorhamphidae (American tetras) > Tyttobryconinae
Etymology: marajoara: Name refers to the type locality, Marajó Island, Brazil. An adjective.
Ambiente: milieu / zona climática / intervalo de profundidade / gama de distribuição
Ecologia
; Água doce bentopelágico. Tropical
South America: Marajó Island, Brazil.
Tamanho / Peso / Idade
Maturidade: Lm ?  range ? - ? cm
Max length : 2.1 cm SL macho/indeterminado; (Ref. 94718)
Descrição breve
Chaves de identificação | Morfologia | Morfometria
Raios dorsais moles (total) : 10 - 11; Vértebras: 31 - 33. This species differs from all members of the genus Tyttobrycon by the possession of tricuspid premaxillary teeth, tri- or pentacuspid maxillary teeth and four broad tricuspid anterior dentary teeth (vs. all teeth conical in the jaws). It can be further diagnosed from all congeners, except T. dorsimaculatus, by having 5-7 premaxillary teeth (vs. 8-9), and from T. dorsimaculatus by having only scattered melanophores on the dorsal fin (vs. dorsal fin with a conspicuous black spot). The presence of adipose fin separates this species from T. hamatus and T. spinosus (vs. adipose fin absent) (Ref. 94718).
Body shape (shape guide): fusiform / normal.
Collected from temporary streams, drying completely during the dry season (September to February) and flowing on the rainy season (March to August). Small groups of adults were found on the bottom and marginal portions of the streams in April. Juveniles in large schools were collected along the bottom of the stream in August (Ref. 94718).
Ciclo de vida e comportamento de acasalamento
Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas
Marinho, M.M.F., D.A. Bastos and N.A. Menezes, 2013. New species of miniature fish from Marajó Island, Pará, Brazil, with comments on its relationships (Characiformes: Characidae). Neotrop. Ichthyol. 11(4):739-746. (Ref. 94718)
Categoria na Lista Vermelha da IUCN (Ref. 130435: Version 2025-2 (Global))
Ameaça para o homem
Harmless
Utilização humana
Ferramentas
Relatórios especiais
Descarregue XML
Fontes da internet
Estimativas baseadas em modelos
Índice de diversidade filogenética (Ref. 82804) |
PD50 = 0.5312 [Uniqueness, from 0.5 = low to 2.0 = high]. |
|
Bayesian length-weight
|
a=0.01122 (0.00514 - 0.02450), b=3.04 (2.87 - 3.21), in cm total length, based on all LWR estimates for this body shape (Ref. 93245). |
Nível Trófico (Ref. 69278) |
3.0 ±0.4 se; based on size and trophs of closest relatives |
Resiliência (Ref. 120179) |
Elevada, tempo mínimo de duplicação da população menor que 15 meses (Preliminary K or Fecundity.). |
Vulnerabilidade da pesca (Ref. 59153) |
Low vulnerability (10 of 100). 🛈 |