Taxonomic revision of Phoxinus minnows (Leuciscidae) from Caucasus, with description of a new narrow-ranged endemic species
Taxonomic revision of Phoxinus from the Caucasus revealed two distinct species. One species, P. colchicus , was known from eastern drainage of Black Sea, but was recorded also in the middle reach of the Kuban (Sea of Azov basin), for the first time. The Kuban population represents a genetically uniq...
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Veröffentlicht in: | Zoosystematics and Evolution 2024-03, Vol.100 (1), p.291-308 |
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Sprache: | eng |
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Zusammenfassung: | Taxonomic revision of
Phoxinus
from the Caucasus revealed two distinct species. One species,
P. colchicus
, was known from eastern drainage of Black Sea, but was recorded also in the middle reach of the Kuban (Sea of Azov basin), for the first time. The Kuban population represents a genetically unique sub-lineage of
P. colchicus
. Its ancestors might have colonized the Kuban system through the event of ancient river capture. Another species inhabits only the Adagum River basin in the lower Kuban and represents a new narrow-ranged endemic species –
Phoxinus adagumicus
sp. nov. According to mtDNA phylogeny (COI and cyt
b
),
P. adagumicus
sp. nov. represents deeply divergent and one of the two early branched lineages of the genus
Phoxinus
being distant to other species (min.
p
-distance = 0.074) including geographical neighbors –
P. chrysoprasius
from Crimean Peninsula and
P. colchicus
from the Caucasus. The new species differs from most
Phoxinus
species by frequently occurring single-row pharyngeal teeth (modal formula 5–4). The narrow geographic range (ca. 55 km in length and 15–20 km in width) and high anthropogenic load on local water systems suggests the new species is under threat and needs protection. |
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ISSN: | 1435-1935 1860-0743 |
DOI: | 10.3897/zse.100.115696 |