Homodiaetus

Homodiaetus is a genus of pencil catfishes native to South America.

Homodiaetus
Homodiaetus anisitsi Eigenmann and Ward (Type)
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

Species

There are currently four recognized species in this genus:[1]

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

Distribution

The distribution of Homodiaetus is restricted you southeastern South America, from Uruguay 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.[2]

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.[2] 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.[2] 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.[2]

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.[2]

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.[2]

References
  1. Froese, Rainer and Pauly, Daniel, eds. (2012). Species of Homodiaetus in FishBase. February 2012 version.
  2. 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. doi:10.1590/s0073-47212002000300004.
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