New species of Stephanodiscus (Bacillariophyta) from the Pleistocene sediments of Lake Baikal

2003 ◽  
Vol 5 (4) ◽  
pp. 77-89
Author(s):  
G. K. Khursevich ◽  
S. A. Fedenya ◽  
M. I. Kuzmin ◽  
E. B. Karabanov ◽  
D. F. Williams ◽  
...  
Keyword(s):  
New Species ◽  
Lake Baikal

Two new species of dorylaimids (Nematoda and Dorylaimida) from Lake Baikal

2011 ◽  
Vol 4 (1) ◽  
pp. 28-33 ◽  
Author(s):  
V. G. Gagarin ◽  
T. V. Naumova
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Two New Species

Two New Species of Eutobrilus Tsalolikhin, 1981 (Nematoda: Triplonchida) from Lake Baikal, Russia

2018 ◽  
Vol 68 (4) ◽  
pp. 741-748
Author(s):  
Vladimir G. Gagarin ◽  
Tatyana V. Naumova
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Two New Species

To the origin of Lake Baikal endemic gammarid radiations, with description of two new Eulimnogammarus spp.

Zootaxa ◽  
2020 ◽  
Vol 4766 (3) ◽  
pp. 457-471
Author(s):  
VICTORIA N. MOSKALENKO ◽  
TATIANA V. NERETINA ◽  
LEV Y. YAMPOLSKY
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Middle Eocene ◽  
Nuclear Genes ◽  
Ancestral State ◽  
Fresh Waters ◽  
Two New Species ◽  
Basal Position ◽  
Molecular Characters

Extraordinarily diverse morphologically and ecologically, Lake Baikal’s two endemic gammaroidean amphipod clades are both firmly placed within the paraphyletic genus Gammarus, based both on morphological and molecular characters. However, the exact placement of the two Baikal clades remains elusive, making reconstruction of the ancestral state of Baikal endemic radiation difficult. We sequenced 2 mitochondrial and 3 nuclear genes from several species of each of the two clades aiming to represent early branches of the radiation. We also describe two new species of Baikal gammarids, Eulimnogammarus etingovae sp. nov. and Eulimnogammarus tchernykhi sp. nov., with some morphology suggestive of basal position within the radiation. We confirm the two previously demonstrated Baikal clades, but cannot unequivocally support any of the previous hypotheses about affinities of the two Baikal clades within palearctic Gammarus species. Rather, it appears that the two Baikal endemic radiations separated from the rest of freshwater Palearctic forms early and rapidly, probably as part of gammarid diversification during colonization of fresh waters in Middle Eocene. 

Endemic Lake Baikal sponges from deep water. 2: Taxonomy and Bathymetric Distribution

Zootaxa ◽  
2017 ◽  
Vol 4236 (2) ◽  
pp. 335 ◽  
Author(s):  
VALERIA B. ITSKOVICH ◽  
OXANA V. KALUZHNAYA ◽  
ELENA VEYNBERG ◽  
DIRK ERPENBECK
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Deep Water ◽  
Great Depth ◽  
Limiting Factor ◽  
Bathymetric Distribution ◽  
Morphological Studies ◽  
Lubomirskia Baicalensis ◽  
The Family ◽  
Baikalospongia Intermedia

Unique samples of deep-water sponges of Lake Baikal were collected between 120 and 1450 m depth and their taxonomy and bathymetric distribution were studied. Based on morphological studies with scanning electron microscopy (SEM) and molecular analyses (CO1, ITS) we describe a new species, Baikalospongia abyssalis sp. nov. Spicule morphology of this new species is similar to Palaeoephydatia sp., a species previously known only from fossils in Late Pliocene (3.2−2.8 mya) sediments. Other sponge samples collected were identified as Baikalospongia intermedia intermedia, B. intermedia profundalis, B. bacillifera, B. fungiformis, B. martinsoni and Swartschewskia papyracea, all from the family Lubomirskiidae. Sponge specimens with giant spicules, identified as B. fungiformis, were found at great depths. B.i. intermedia and B. i. profundalis are dominating species at great depth. Light is a limiting factor for distribution of Lubomirskia baicalensis, possibly due to its symbiosis with photosynthetic protists. The current study extends our knowledge on the distribution boundaries of Lubomirskiidae at great depths. 

A new species of Pseudorhynchelmis Hrabě, 1982 (Clitellata: Lumbriculidae) from Lake Baikal, with re-descriptions of P. parva and P. olchonensis

Zootaxa ◽  
2008 ◽  
Vol 1938 (1) ◽  
pp. 23-39
Author(s):  
PATRICK MARTIN ◽  
IRINA KAYGORODOVA
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Original Description ◽  
Type Specimens ◽  
The Family ◽  
Long Time ◽  
Taxonomical Status ◽  
Established Genus ◽  
A New Species

The recent rediscovery of specimens of the Baikalian lumbriculid Pseudorhynchelmis olchonensis (Burow et Koshow, 1932) led to the re-examination of (1) Michaelsen’s hundred-year-old type specimens of Lycodrilus parvus, assumed, for a long time, to have been wrongly attributed to the Tubificidae instead of the Lumbriculidae, and of (2) type specimens used by Hrabě (1982) for his redescription of Lycodrilus parvus and its combination with the newly, subsequently created genus Pseudolycodrilus Hrabě, 1982. Surprisingly enough, the original description of Pseudolycodrilus parvus (Michaelsen, 1905) proved to be based on a mixing of two different species, P. parva and Pseudorhynchelmis semernoyi sp. nov., both of which are herein assigned to the recently re-established genus Pseudorhynchelmis Hrabě, 1982. As a result, the genus Pseudolycodrilus is invalidated and must be considered as a synonym of Pseudorhynchelmis. P. parva and P. olchonensis are re-described on the basis of neotypes and lectotypes, respectively. P. semernoyi sp. nov. is distinguished from other Pseudorhynchelmis by having a conical prostomium, a well-marked clitellum with a honeycomb-like structure, and genital, sucker-like papillae, associated with penial setae. The description of the new species P. semernoyi, plus a re-evaluation of P. olchonensis, called into question the taxonomical status of Pseudorhynchelmis dissimilis (Semernoy, 2004). This study provides new examples of genital setae in the Lumbriculidae although this character remains exceptional within the family.

scholarly journals Description of a new species Gyraulus (Pulmonata: Planorbidae) from the land thermal spring Khakusy of Lake Baikal

ZooKeys ◽  
2018 ◽  
Vol 762 ◽  
pp. 1-12 ◽  
Author(s):  
Tatiana Sitnikova ◽  
Tatiana Peretolchina
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Thermal Spring ◽  
Morphological Characters ◽  
Shell Size ◽  
The North ◽  
The Family ◽  
North Eastern ◽  
Small Shell ◽  
A New Species

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 Gyraulustakhteevi sp. n. includes morphological characters and gene sequences (COI of mtDNA) for the species separation from sister taxon Gyraulusacronicus (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 Gyraulustakhteevi sp. 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.

scholarly journals Additions to the bryoflora of the Baikal-Lensky Nature Reserve (Irkutsk Region)

2021 ◽  
Vol 20 (1) ◽  
pp. 362-366
Author(s):  
E. S. Prelovskaya ◽  
S. G. Kazanovsky ◽  
N. V. Stepantsova
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Large Scale ◽  
Nature Reserve ◽  
Natural Conditions ◽  
Adjacent Section ◽  
The North ◽  
Natural Reserve ◽  
Irkutsk Region ◽  
North Western

The Baikal-Lensky State Natural Reserve was established in 1986. It covers a part of the north-western coastof Lake Baikal from Cape Onholoy to Cape Elokhin and the adjacent section of the Baikal ridge. The article describes thecharacteristics of the natural conditions of the reserve. Large-scale studies of the bryophyte flora in the reserve have not beencarried out. Currently, 195 species of bryophytes are known here (37 species of liverworts and 158 species of mosses). The listof bryophytes of the Baikal-Lensky Nature Reserve contains 33 species of liverworts and 135 leafy mosses. Platydictya acuminata (Lindb. et Arnel) Ignatov and Hamatocaulis vernicosus (Mitt.) Hedenäs are included in the Red Book of Irkutsk Oblast.Bryological material on the Baikal-Lensky nature reserve, collected by N. V. Stepantsova, has been analyzed. New species ofliverworts (4 species) and leafy mosses (19 species) were revealed. The territory of the Baikal-Lensky Nature Reserve requiresspecial bryological studies. Taking into account the peculiarities of the natural conditions of the reserve, we assume a significant replenishment of the list of bryoflora. We believe that the bryoflora of the Baikal-Lensky Reserve has been studied by lessthan 50 %. The detection of liverworts is approximately 25–30 %, leaf-stem mosses – 40–45 %.

New Stylodrilus species (Annelida; Clitellata; Lumbriculidae) from Lake Baikal, East Siberia

2008 ◽  
Vol 17 (1) ◽  
pp. 145-149
Author(s):  
I. Kaygorodova ◽  
P. Martin
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Species Flock ◽  
East Siberia ◽  
Unique Character

A new oligochaete worm, Stylodrilus aclotudi, has been reported from the southern part of Lake Baikal in East Siberia, Russia. The new species differs in extremely long tubular atria extending as far as segment XV, that is a unique character of the genus. This new fi nding increases the number of Stylodrilus species which are endemic to the lake up to 11, confi rming the existence of Baikal species flock.

Prodorylaimus filamentus sp. n. and Eutobrilus longicaudatoides sp. n. (Nematoda) from Lake Baikal, Russia

Zootaxa ◽  
2011 ◽  
Vol 3103 (1) ◽  
pp. 57 ◽  
Author(s):  
VLADIMIR G. GAGARIN ◽  
TATYANA V. NAUMOVA
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Tail Length ◽  
Nematode Species ◽  
Length Ratio

Two nematode species found in Lake Baikal, Russia are described. Prodorylaimus filamentus sp. n. is morphologically close to P. longicaudatoides Altherr, 1968 and P. kralli Tsalolikhin, 1975. The new species can be separated from P. longicaudatoides by the longer body (L = 4.89–6.06 mm versus L = 2.0–3.5 mm), relatively longer tail (c′ = 18.4–25.0 versus c′ = 14–18), longer odontostyle (60–65 µm long versus 32–37 µm long), presence of double and wide guiding ring and longer spicules (89–90 µm long versus 70–78 µm long). It can also be separated from P. kralli by the longer tail (c = 4.3– 6.0, c’ = 18.4–25.0 versus c = 7.0–8.0, c′ = 11–16), lower “vulva-anus to tail length” ratio (1.6–2.2 versus 2.5–3.0), shorter odontostyle (60–65 µm long versus 75–80 µm long). Eutobrilus longicaudatoides sp. n. is closely related to E. anguiculus Tsalolikhin, 1977, but is clearly distinct in the shorter outer labial setae (9–10 µm long or 45–52% of the labial region diameter versus 15–20 µm long or 50–60 % of the labial region diameter), longer tail (males, c = 5.3–5.5, c’ = 11.4–11.8, females, c = 4.5–6.3, c′ = 15.1–16.7, versus males, c = 7.4–10.4, c′ = 8–9, females, c = 5.0–7.7, c′ = 10–12), smaller number of supplements (5 versus 6) and shorter spicules (47–53 µm long versus 66–68 µm long).

A Putative Species Flock in the Diatom GenusGomphonemaEhrenberg (Bacillariophyta: Gomphonemataceae) from Lake Baikal, Russia: Description of Six New Species Similar toG. ventricosumW. Gregory

2018 ◽  
Vol 39 (3) ◽  
pp. 365-388 ◽  
Author(s):  
John P. Kociolek ◽  
Maxim S. Kulikovskiy ◽  
Irina V. Kuznetsova ◽  
Anton M. Glushchenko ◽  
Cüneyt N. Solak
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Species Flock ◽  
Putative Species
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