Odhneripisidium сaucasus Bespalaya, Vinarski, Aksenova, Kondakov & Palatov, sp. nov.
Creators: name: Bespalaya, Yulia V.
name: Vinarski, Maxim V.
name: Aksenova, Olga V.
name: Babushkin, Evgeniy S.
name: Gofarov, Mikhail Yu.
name: Kondakov, Alexander V.
name: Konopleva, Ekaterina S.
name: Kropotin, Alexander V.
name: Mabrouki, Youness
name: Ovchankova, Nadezda B.
name: Palatov, Dmitry M.
name: Sokolova, Svetlana E.
name: Shevchenko, Alexander R.
name: Travina, Oksana V.
name: Taybi, Abdelkhaleq F.
name: Soboleva, Alena A.
name: Zubrii, Natalia A.
name: Bolotov, Ivan N.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Bivalvia
Sphaeriida
Sphaeriidae
Odhneripisidium

description: Odhneripisidium сaucasus Bespalaya, Vinarski, Aksenova, Kondakov & Palatov sp. nov.
(Fig. 11D)
Zoobank number: urn:lsid:zoobank.org:act: 7F5E99C9-C0DB-4D05-8DE6-9F80CE7AAA99.
Type series: The type series includes the holotype and 42 paratypes deposited in RMBH (accession numbers: RMBH MSph-296, MSph-327).
Type locality: Russia, Krasnodar Region, Dolgaya Сave (43°36 ʹ 35.9″N 39°56 ʹ 54.5″E).
Etymology: This species is named after the Caucasus Range.
Material examined: Abkhazia, Gudautsky District, spring near Psyrkha station II.2018, Palatov leg., 42 specimens (lot no. RMBH MSph-327), Russia, Krasnodar Region, Dolgaya Сave, IV.2015, Palatov leg., one specimen (lot no. RMBH MSph-296).
Description: The shell is small (length 2.24 mm), round-oval in shape (Fig. 11D). The beaks are not prominent, located in the middle of the valves (Fig. 11D, E). The cardinal tooth of the right valve is slightly curved, its posterior end is branched. The inner cardinal tooth of the left valve is thickened, curved (Fig. 12E). The outer cardinal tooth of the left valve is short, thickened at the anterior end, slightly curved, and inclined towards the inner tooth (Fig. 12E).
Distribution: Caucasus.
Differential diagnosis: Odhneripisidium caucasus can be distinguished from its sister species, Odhneripisidium moitessierianum (Paladilhe, 1866), Odhneripisidium tenuilineatum (Stelfox, 1918), and Odhneripisidium stewarti (Preston, 1909), by its shell morphology (Fig. 11D). In contrast with O. caucasus, the species O. moitessierianum and O. tenuilineatum have prominent beaks. The shell of O. stewarti is rather inflated with prominent beaks unlike that of O. caucasus.
Molecular diagnosis: The new species differs from its congeners by three fixed nucleotide substitutions in the 16S rRNA gene fragment (65 C, 66 G, and 71 G) and one fixed nucleotide substitution in the 28S rRNA gene fragment (691 C). The uncorrected 16S p-distance of the new species from other congeners is 4.8–10.6% and that based on 28S rRNA is 0.8–4.8%. The nearest congener is O. moitessierianum with the mean uncorrected 16S p-distance 6.5 ± 1.1%. The mean uncorrected 16S p-distance of the new species from O. stewarti and O. tenuilineatum is 7.8 ± 1.2% (± SD).
description: Published as part of Bespalaya, Yulia V., Vinarski, Maxim V., Aksenova, Olga V., Babushkin, Evgeniy S., Gofarov, Mikhail Yu., Kondakov, Alexander V., Konopleva, Ekaterina S., Kropotin, Alexander V., Mabrouki, Youness, Ovchankova, Nadezda B., Palatov, Dmitry M., Sokolova, Svetlana E., Shevchenko, Alexander R., Travina, Oksana V., Taybi, Abdelkhaleq F., Soboleva, Alena A., Zubrii, Natalia A. & Bolotov, Ivan N., 2024, Phylogeny, taxonomy, and biogeography of the Sphaeriinae (Bivalvia: Sphaeriidae), pp. 305-338 in Zoological Journal of the Linnean Society 201 (2) on page 330, DOI: 10.1093/zoolinnean/zlad139, http://zenodo.org/record/13220074