Homodiaetus

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Homodiaetus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Siluriformes
Family: Trichomycteridae
Subfamily: Stegophilinae
Genus: Homodiaetus
Eigenmann & Ward, 1907
Type species
Homodiaetus anisitsi
Eigenmann & Ward, 1907
Binomial name

Homodiaetus anisitsi
Eigenmann & Ward, 1907
Homodiaetus banguela
Koch, 2002
Homodiaetus graciosa
Koch, 2002
Homodiaetus passarellii
(Miranda Ribeiro, 1944)

Homodiaetus is a genus of catfishes (order Siluriformes) of the family Trichomycteridae. It includes four species, H. anisitsi, H. banguela, H. graciosa, and H. passarellii.[1][2]

Contents

[edit] Distribution

The distribution of Homodiaetus is restricted you southeastern South America, from Urugay to Paraguay Rivers in the west to the coastal drainages of the Rio de Janeiro State, Brazil. H. anisitsi originates from the Paraná-Paraguay River basin. H. banguela inhabits the São João River and H. passarellii is known from coastal basins in the State of Rio de Janeiro. H. graciosa is distributed in coastal basins of southeastern Brazil in states of Paraná and São Paulo.[1]

[edit] Description

Homodiaetus is currently distinguished from other genera of Stegophilinae by the combination of the origin of the pelvic fin midlength between the tip of the snout and the caudal-fin origin, the opercle with three or more odontodes, and the gill membranes confluent with the isthmus.[1] Homodiaetus species are small and grow up to 42 millimetres (1.7 in) SL. They are transparent with the except of the head and abdomen.[1] Homodiaetus species have a thin body and depressed head that is almost as wide as the head is long. The dorsal and ventral profiles are straight except for a convex head. The mouth is inferior.[1]

H. anisitsi has three dark bands on its caudal fin, while dark lines are irregular or absent in the other three species. Among the other three species, H. graciosa has 5–6 rows of teeth in the dentary (vs. 6–7 in the other two species). H. graciosa has 7–9 (usually 8) opercular odontodes, H. passarellii has 6–7, and H. banguella has 9.[1]

[edit] Ecology

Homodiaetus species are found in lagoons and arenaceous rivers of little depth. These fish are known to be lepidophagous, meaning they feed upon scales.[1]

[edit] References

  1. ^ a b c d e f g Koch, Walter Rudolf (30 September 2002). "Revisão Taxonômica do Gênero Homodiaetus (Teleostei, Siluriformes, Trichomycteridae) (Portuguese)" (PDF). Iheringia, Sér. Zool., Porto Alegre 92 (3): 33–46. 
  2. ^ Ferraris, Carl J., Jr. (2007). "Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types" (PDF). Zootaxa 1418: 1–628.