Osteogaster

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Genus of fishes

title: "Osteogaster" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["osteogaster", "corydoradinae", "catfish-genera"] description: "Genus of fishes" topic_path: "general/osteogaster" source: "https://en.wikipedia.org/wiki/Osteogaster" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Genus of fishes ::

| name = Osteogaster | image = Ost_clipped.png | image_caption = Osteogaster eques | taxon = Osteogaster | authority= Cope, 1894 | type_species = Corydoras eques | type_species_authority = Steindachner, 1876 | subdivision_ranks = Species | subdivision = See text

Osteogaster is a genus of catfish in the subfamily Corydoradinae, family Callichthyidae of the order Siluriformes. Before the recent resurrection of the genus, these species had been grouped in the genus Corydoras.

Taxonomy

Osteogaster was erected by Edward Drinker Cope in 1894. Before 2024, it was considered defunct by most scientific authorities, being considered as a junior synonym or subgenus of Corydoras. It was formally resurrected and revalidated in a phylogenomic analysis carried out in 2024.

Etymology

The generic name, Osteogaster, is derived from the Greek ὀστέον, ostéon, meaning "bone:, and γαστήρ, gastḗr, meaning "belly", referring to the coracoid bones of O. eques which completely enclose the ventral region.

Morphology

::figure[src="https://upload.wikimedia.org/wikipedia/commons/4/47/Corydoras_aeneus_2.jpg" caption="''Osteogaster aenea''"] ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/2/28/Corydoras_rabauti.jpg" caption="''Osteogaster rabauti''"] ::

The basic color of species of the genus Osteogaster is yellowish-orange to reddish-orange, and there is a single large dark spot on the sides of the body. The fins are usually unspotted. Osteogaster species differ from all other armoured catfishes in the following characteristics, among others:

  • The mesethmoid, a skull bone, is small to medium-sized. In Gastrodermus, the mesethmoid is noticeably short. In Corydoras, it is large, and in Brochis, it is very large.
  • The posterior edge of the pectoral fin spine is usually provided with serrations, which are perpendicular or arranged at right angles to the spine. In Brochis, Corydoras, Gastrodermus, and Scleromystax, these serrations are directed toward the base of the pectoral fin spine.

Species

, there are currently eight extant species in this genus (as recognized by Eschmeyer's Catalog of Fishes):

References

References

  1. Marcelo Ribeiro de Britto. (January 2009). "Phylogeny of the subfamily Corydoradinae Hoedeman, 1952 (Siluriformes: Callichthyidae), with a definition of its genera". Proceedings of the Academy of Natural Sciences of Philadelphia.
  2. Angelica C Dias. (March 2025). "Phylogenomic analyses in the complex Neotropical subfamily Corydoradinae (Siluriformes: Callichthyidae) with a new classification based on morphological and molecular data". Zoological Journal of the Linnean Society.
  3. (12 September 2025). "Family CALLICHTHYIDAE Bonaparte 1835 (Armored Catfishes)". Christopher Scharpf and Kenneth J. Lazara.
  4. {{Cof genus
  5. (September 2016). "Wrapped in flames: ''Corydoras hephaestus'', a new remarkably colored species from the Rio Madeira basin (Teleostei: Callichthyidae)". [[Zootaxa]].

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

osteogastercorydoradinaecatfish-genera