The diversity of the Baikal lineage of Hydra oligactis Pallas, 1766: molecular and morphological evidence

By

Peretolchina, Tatiana
Khanaev, Igor
Enushchenko, Ilya
Sherbakov, Dmitry
Kravtsova, Lyubov S

Type

Article

Date of Publication

2020

Original Publication

ZooKeys

Volume

912

Pages

1--12

Subjects

Baikal hydras , holotrichous isorhizas , Phylogeny , taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.912.46898

 

Abstract

In this paper, molecular analyses of Baikal hydras from the ‘oligactis group’, based on COI and ITS1–5.8S–ITS2, and morphological analysis of their holotrichous isorhizas, were performed. Low genetic diversity and shared haplotypes were found between Hydra oligactis Pallas, 1766 and Hydra baikalensis Swarczewsky, 1923 specimens, which is evidence of the mixing of these lineages. Genetic distances among all Baikal hydras (0.006) were less than the interspecific distances of other hydras. The size of hydras and proportions of their holotrichous isorhizas varied depending on microhabitat and environmental conditions. Our combined molecular and morphological approach proves that H. baikalensis is synonymous with H. oligactis