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

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

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. 

Two new species of Theristus Bastian, 1865 (Nematoda: Xyalidae) from the interstitial zone of Lake Baikal, Siberia, Russia

Nematology ◽  
2012 ◽  
Vol 14 (4) ◽  
pp. 499-508 ◽  
Author(s):  
Vladimir G. Gagarin ◽  
Tatyana V. Naumova
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Anterior Position ◽  
Two New Species ◽  
Amphidial Fovea

Theristus tsalolikhini sp. n. and T. psammophilus sp. n. from the interstitial zone of Lake Baikal, Russia, are described from numerous females and males. Theristus tsalolikhini sp. n. is similar to T. ruffoi, but differs from it by the presence of elongate spermatheca, narrower labial region, shorter outer labial setae, larger amphidial fovea, more anterior position of amphidial fovea and shorter spicules and gubernaculum. Theristus psammophilus sp. n. is similar to T. athesinus, but differs from it by the presence of an elongate spermatheca, shorter outer labial setae, more anterior position of the amphidial fovea and longer spicules and gubernaculum. A pictorial key is provided for males of freshwater and groundwater species of Theristus.

A Synopsis of Dicliptera (Acanthaceae) in Brazil, with the Description of Two New Species

2020 ◽  
Vol 45 (2) ◽  
pp. 340-348
Author(s):  
James Lucas da Costa-Lima ◽  
Earl Celestino de Oliveira Chagas
Keyword(s):  
New Species ◽  
South America ◽  
The State ◽  
Northeastern Brazil ◽  
Mato Grosso ◽  
The North ◽  
New Synonyms ◽  
Two New Species ◽  
Mato Grosso Do Sul ◽  
A New Species

Abstract—A synopsis of Dicliptera (Acanthaceae) for Brazil is presented. Six species are recognized: Dicliptera ciliaris, D. sexangularis, and D. squarrosa, widely distributed in South America; D. purpurascens, which ranges from the North Region of Brazil (in the state of Acre) to eastern Bolivia; D. gracilirama, a new species from the Atlantic Forest of northeastern Brazil; and D. granchaquenha, a new species recorded in dry and semideciduous forests in Bolivia and western Brazil, in the state of Mato Grosso do Sul. Furthermore, we propose new synonyms and designate lectotypes for eleven names. An identification key to the six accepted Dicliptera species in Brazil is provided.

Two New Species of Aira (Poaceae) from the Iberian Peninsula and the Balearic Islands

2020 ◽  
Vol 45 (1) ◽  
pp. 75-84
Author(s):  
Llorenç Sáez ◽  
Javier López-Alvarado ◽  
Pere Fraga ◽  
Regina Berjano ◽  
M. Ángeles Ortiz ◽  
...  
Keyword(s):  
Risk Assessment ◽  
New Species ◽  
Iberian Peninsula ◽  
Diploid Species ◽  
Balearic Islands ◽  
Similar Species ◽  
Chromosome Counts ◽  
Two New Species

Abstract—Two new diploid species, Aira minoricensis and Aira hercynica, are described and illustrated, along with chromosome counts, risk assessment, distribution and habitat, phenology, and comparisons with morphologically similar species. A comparative table and a key for the species of Aira for the Iberian Peninsula and the Balearic Islands are provided to assist in the identification of these overlooked species, and their relationships to other taxa are discussed.

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

Palaeontology, taxonomic revision and variability of some species of the genus Gassendiceras Bert et al., 2006 (Ammonitina, Upper Barremian) from southeastern Franc

2013 ◽  
Vol 63 (3) ◽  
pp. 355-429 ◽  
Author(s):  
Didier Bert ◽  
Stéphane Bersac ◽  
Gérard Delanoy ◽  
Léon Canut
Keyword(s):  
New Species ◽  
Intraspecific Variability ◽  
Taxonomic Revision ◽  
Two New Species

Abstract Bed-by-bed sampling of twelve Barremian sections in southeastern France from pelagic basin (Vocontian Basin) to neritic platforms (Arc of Castellane, Arc of Nice and Provencal Domain) has enabled the collection of isochronous samples of the ammonite genus Gassendiceras. Three poorly known species of the Toxancyloceras vandenheckei Zone (Upper Barremian) are revised: G. alpinum, G. multicostatum and G. hoheneggeri; two new species are described (G. rebouleti nov. sp. and G. bosellii nov. sp.). The intraspecific variability of particular species was recognised. This variability is between slender peramorphic and robust paedomorphic extreme morphologies, with the presence of all intermediates.

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