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. 2018 May 30;(762):1-12.
doi: 10.3897/zookeys.762.23661. eCollection 2018.

Description of a New Species Gyraulus (Pulmonata: Planorbidae) From the Land Thermal Spring Khakusy of Lake Baikal

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Free PMC article

Description of a New Species Gyraulus (Pulmonata: Planorbidae) From the Land Thermal Spring Khakusy of Lake Baikal

Tatiana Sitnikova et al. Zookeys. .
Free PMC article

Abstract

A new species of the family Planorbidae is described from the land thermal spring Khakusy, on the north-eastern shore of Lake Baikal. The description of Gyraulus takhteevisp. n. includes morphological characters and gene sequences (COI of mtDNA) for the species separation from sister taxon Gyraulus acronicus (A. Férussac, 1807) collected from the small Krestovka River in-flowing into the south-western part of the Lake. The new species differs from G. acronicus in small shell size of adults, having smaller number of prostate folds (maximal up to 26 in G. takhteevi n. sp. vs. 40 in G. acronicus), a short preputium (approximately twice shorter than the phallotheca), and an elongated bursa copulatrix. The population of Gyraulus takhteevisp. n. consists of two co-existent morphs: one of them has a narrow shell spire and the second is characterized by wide spire similar to the shell of G. acronicus. One of the two revealed haplotypes of the new species includes both morphs, while the second consists of snails with wide spired shells.

Keywords: COI mtDNA; morphology; planorbid gastropods.

Figures

Figure 1.
Figure 1.
Shells of type specimens of Gyraulus takhteevi sp. n. and G. acronicus Férussac, 1807). A Holotype G. takhteevi sp. n. B–E Paratypes G. takhteevi sp .n. A–C morph 1 with narrow spire D, E morph 2 with wide spire F–G G. acronicus from Krestovka River: F young individual F mature individual after 5 months of a cultivation. Abbreviations: a – aperture view; b – right side with umbilicus, c – left side with spire. Scale bar 1 mm.
Figure 2.
Figure 2.
Radular teeth of Gyraulus takhteevi sp. n. A Central and lateral teeth (arrow shows a central tooth) B Marginal teeth. Scale bar 10 mμ.
Figure 3.
Figure 3.
Drawing pictures of the reproductive organs of Gyraulus takhteevi sp. n. Abbreviations: ag albumen gland bc bursa copulatrix hd hermaphrodite duct ot ovotestis pht phallotheca pr prostate prp preputium sv seminal vesicles vd vas deferens u uterus. Scale bar 1 mm.
Figure 4.
Figure 4.
Copulatory organs (A–D), bursa copulatrix (E) and egg mass (F). A–B, E–F Gyraulus takhteevi sp. n.: A morph 1 B morph 2 C–D G. acronicus from Krestovka River: young (shell Fig. 1F), male stage of mature (shell Fig. 1G).
Figure 5.
Figure 5.
Stylets of Gyraulus takhteevi sp. n. (A) and G. acronicus from Krestovka River (B). Scale bar 200 mμ.
Figure 6.
Figure 6.
Phylogram derived from Bayesian analysis of CO1 mtDNA gene sequences. Values at nodes represent posterior probabilities. The scale bar represents the branch length as a measure of substitution per site.

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