Biology:Pseudochondrostoma
Pseudochondrostoma is a genus of freshwater ray-finned fish belonging to the family Leuciscidae, which includes the daces, Eurasian minnows and related species. The fishes in this genus occur in the Iberian Peninsula. They are commonly known as the straight-mouth nases.
Taxonomy
Pseudochondrostoma was first proposed as a genus in 2007 by Joana Isabel Robalo, Vítor Carvalho Almada, André Levy Coelho and Ignacio Doadrio Villarejo with Chondrostoma polylepis designated as the type species.[1] C. polylepis was first formally described in 1864 by the Austrian ichthyologist Franz Steindachner with its type locality given as Crato, Portugal.[2] Robalo et al proposed the genus Pseudochondrostoma when they reviewed the genus Chondrostoma and found that in the north and central Mediterranean the taxa previoulsy included in Chondrostoma should be placed in new genera. The authors proposed that these taxa be transferred into the genera Achondrostoma, Iberochondrostoma, Pseudochondrostoma, Protochondrostoma and Parachondrostoma.[3] The genus Pseudochondrostoma is classified within the subfamily Leuciscinae of the family Leuciscidae.[1]
Species
Pseudochondrostoma contains the following species:[2]
- Pseudochondrostoma duriense (M. M. Coelho, 1985) (Northern straight-mouth nase)
- Pseudochondrostoma polylepis (Steindachner, 1864) (Iberian nase)
- Pseudochondrostoma willkommii (Steindachner, 1866) (Southern straight-mouth nase)
Etymology
Pseudchondrostoma prefixes Chondrostoma with pseudo- which means "false", applied because although the fishes in this genus are similar in appearance to the nases in the genus Chondrostoma such similarities are due to convergent evolution rather than common ancestry, and are therefore "false".[4]
Characteristics
Pseudchondrostoma nases have a straight, rather than arched mouth, which has a horny layer in the lower lip. They have between 59 and 78 pored scales in the lateral line, there are between 10 and 12 scales above the lateral line with 4 to 6 scales below it. The anal fin has between 8 and 10 branched rays with 8 or 9 branched rays in the dorsal fin.[3] These fishes all have maximum standard length of 40 cm (16 in).[5]
Distribution
Pseudchondrostoma nases are endemic to the rivers on the Atlantic coastal slope if the Iberian Peninsula.[3]
References
- ↑ 1.0 1.1 Cite error: Invalid
<ref>tag; no text was provided for refs namedCof family - ↑ 2.0 2.1 Eschmeyer, William N.; Fricke, Ron; van der Laan, Richard, eds. "Species in the genus Pseudochondrostoma". California Academy of Sciences. http://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatget.asp?tbl=species&genus=Pseudochondrostoma.
- ↑ 3.0 3.1 3.2 Robalo, J. I. (2007). "Re-examination and phylogeny of the genus Chondrostoma based on mitochondrial and nuclear data and the definition of 5 new genera". Molecular Phylogenetics and Evolution 42 (2): 362–372. doi:10.1016/j.ympev.2006.07.003. PMID 16949308. Bibcode: 2007MolPE..42..362R. http://uiee.ispa.pt/ficheiros/artigos/robalo2007a.pdf.
- ↑ Christopher Scharpf (8 April 2024). "Family LEUCISCIDAE: Subfamily LEUCISCINAE Bonaparte 1835 (European Minnows)". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf. https://etyfish.org/leuciscinae/.
- ↑ Froese, Rainer and Pauly, Daniel, eds. (2025). Species of Pseudochondrostoma in FishBase. February 2025 version.
Wikidata ☰ Q3815346 entry
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