scholarly journals A finding of a frozen mummy of a lemming (Rodentia, Cricetidae, Lemmus) in the upper pleistocene of Yakutia

2019 ◽  
Vol 489 (1) ◽  
pp. 108-112
Author(s):  
A. V. Lopatin ◽  
N. G. Solomonov ◽  
N. V. Serdyuk ◽  
E. N. Maschenko ◽  
D. V. Mukha ◽  
...  
Keyword(s):  
Dna Sequences ◽  
Coat Color ◽  
Coi Gene ◽  
Lower Incisor ◽  
Upper Pleistocene ◽  
X Ray ◽  
Radiocarbon Age ◽  
Mitochondrial Coi ◽  
Mitochondrial Coi Gene ◽  
Maximum Similarity

External morphological, X‑ray and tomographic study of the rodent frozen mummy from the Upper Pleistocene Yedoma deposits on the Tirekhtyakh River (tributary of the Semyulyakh River, Abyi District, Republic of Sakha (Yakutia)) showed its belonging to Lemmus sp. The radiocarbon age of the find is 41 305-41 885 cal BP. This is the first Pleistocene discovery of a frozen mummy of the representative of the genus Lemmus. In terms of body and skull size, coat color, length of the lower incisor and the structure of the molars, the specimen studied is closed to the Recent Lemmus sibiricus (Kerr, 1792). Comparison of the mitochondrial COI gene sequence with the DNA sequences presented in the GenBank database demonstrates maximum similarity with the Recent Siberian brown lemming too.

Population connectivity of hydrothermal-vent limpets along the northern Mid-Atlantic Ridge (Gastropoda: Neritimorpha: Phenacolepadidae)

2017 ◽  
Vol 99 (1) ◽  
pp. 179-185 ◽  
Author(s):  
Takuya Yahagi ◽  
Hiroaki Fukumori ◽  
Anders Warén ◽  
Yasunori Kano
Keyword(s):  
Dna Sequences ◽  
Hydrothermal Vents ◽  
Population Connectivity ◽  
Coi Gene ◽  
Planktotrophic Larva ◽  
Mitochondrial Coi ◽  
Mitochondrial Coi Gene ◽  
Mid Atlantic Ridge ◽  
Eye Pigmentation ◽  
Menez Gwen

The red-blooded limpet ‘Shinkailepas’briandi(Neritimorpha: Phenacolepadidae) is one of the commonest gastropod species at deep-sea hydrothermal vents on the Mid-Atlantic Ridge (MAR). We investigated its population connectivity along MAR as the first such study for gastropods and explored the importance of larval migration for the distribution of vent-endemic animals. Our analyses, based on 1.3-kbp DNA sequences from the mitochondrial COI gene, showed a panmictic population throughout its geographic and bathymetric ranges that span from the northernmost and shallowest Menez Gwen vent field (38°N; 814–831 m depth) to the southernmost and deepest Ashadze field (13°N; 4090 m). Early development of this species is presumed to have a long pelagic duration as a planktotrophic larva; the hatchling with a shell diameter of 170–180 μm attains a constant settlement size of 706 ± 8 μm (mean ± SD). Retention of eye pigmentation in newly settled juveniles, along with the genetic panmixia, suggests that the hatched larva of ‘S.’briandimigrates vertically to the surface water, presumably to take advantage of richer food supplies and stronger currents for dispersal, as has been shown for confamilial species at hydrothermal vents and cold methane seeps.

scholarly journals A new subterranean Crematogaster with one ommatidium from Cambodia, based on morphology and DNA (Hymenoptera: Formicidae)

2019 ◽  
Vol 59 (2) ◽  
pp. 507-511
Author(s):  
Shingo Hosoishi
Keyword(s):  
New Species ◽  
Dna Sequences ◽  
Related Species ◽  
Coi Gene ◽  
Closely Related Species ◽  
Mitochondrial Coi ◽  
Mitochondrial Coi Gene

Abstract A subterranean myrmicine ant Crematogaster monocula sp. nov. is described based on two worker specimens from Cambodia. This species belongs to the C. biroi group of the subgenus Orthocrema Santschi, 1918, which is characterized by developed subpetiolar process, developed subpostpetiolar process and sculptured mesosoma. The new species is easily distinguished from other species of Crematogaster Lund, 1831 by having only one ommatidium. DNA sequences comprising a 761 bp fragment of the 3’ region of the mitochondrial COI gene were amplified and analyzed for C. monocula sp. nov. and other closely related species from the same group. The interspecific COI divergence is 17.8% for C. monocula sp. nov. and C. reticulata Hosoishi, 2009. This species is unique in having the smallest eye in the genus Crematogaster.

scholarly journals Speciation in Thrips tabaci Lindeman, 1889 (Thysanoptera): the current state of knowledge and its consequences

2016 ◽  
Vol 85 (1) ◽  
pp. 93-104 ◽  
Author(s):  
József Fail
Keyword(s):  
Dna Sequences ◽  
Host Plants ◽  
Thrips Tabaci ◽  
Coi Gene ◽  
Mitochondrial Coi ◽  
The Third ◽  
Current State ◽  
Mitochondrial Coi Gene

AbstractBased on DNA sequences of the mitochondrial COI gene,Thrips tabacihas been divided into three lineages: a tobacco-associated (T) and two leek-associated types (L1, L2). It is believed that the arrhenotokous leek-associated type (L1) is the ancient form ofT. tabaciand that the T type diverged from it and adapted to solanaceous host plants. The third lineage ofT. tabaci, the so-called thelytokous leek-associated type (L2) and the L1 form share many host plants. According to a recent study, the L2 form ofT. tabacicould outcompete the L1 type on cabbage plants; it might therefore be more accurate to identify it as the thelytokous cabbage-associated type.

A review of the genus Forficuloecus Conci (Phthiraptera: Philopteridae) from parrots (Psittaciformes: Psittacidae), with descriptions of four new species

Zootaxa ◽  
2008 ◽  
Vol 1859 (1) ◽  
pp. 49 ◽  
Author(s):  
ROGER D. PRICE ◽  
KEVIN P. JOHNSON ◽  
RICARDO L. PALMA
Keyword(s):  
New Species ◽  
Coi Gene ◽  
Chewing Louse ◽  
Mitochondrial Coi ◽  
Mitochondrial Coi Gene ◽  
Genetic Distinctiveness

Ten species, including four new species, of the chewing louse genus Forficuloecus Conci, 1941, are recognized from Australasian parrots, and a key is given for their identification. The new species and their type hosts are: F. cameroni ex the Red-winged Parrot, Aprosmictus erythropterus (J.F. Gmelin, 1788); F. banksi ex the Mulga Parrot, Psephotus varius Clark, 1910; F. wilsoni ex the Northern Rosella, Platycercus venustus (Kuhl, 1820); and F. josephi ex the Bourke's Parrot, Neopsephotus bourkii (Gould, 1841). Partial sequences of the mitochondrial COI gene support the genetic distinctiveness of these new species.

Are Tetranychus macfarlanei Baker & Pritchard and Tetranychus malaysiensis Ehara (Acari: Tetranychidae) one species? Morphological and molecular evidences for synonymy between these two spider mite species and a note on invasiveness of T. macfarlanei on okra and eggplant in India

2017 ◽  
Vol 22 (4) ◽  
pp. 467
Author(s):  
Mahran Zeity ◽  
Nagappa Srinivas ◽  
Chinnamade Channegowde Gowda
Keyword(s):  
Spider Mite ◽  
Morphological Characters ◽  
Molecular Data ◽  
Mite Species ◽  
Coi Gene ◽  
High Similarity ◽  
Mitochondrial Coi ◽  
Mitochondrial Coi Gene ◽  
High Degree ◽  
Degree Of Similarity

Study of morphological characters of Tetranychus macfarlanei Baker & Pritchard and Tetranychus malaysiensis Ehara revealed high similarity by comparing all the important characters in addition to the characters pointed out by Ehara to separate those two species. Molecular phylogeny of seven Indian populations of T. macfarlanei and one population of T. malaysiensis from Philippines along with few distantly related species of Tetranychus was attempted. High degree of similarity between these two species at mitochondrial COI gene (96%) as well as ITS2 (rDNA) (96–99%) region was evident. Based on both morphological features and molecular data, T. malaysiensis is proposed as a junior synonym of T. macfarlanei based on ICZN’s law of priority. Also more female characters are prompted in this study to distinctly discriminate T. macfarlanei from its most resembling species, Tetranychus ludeni Zacher. Tetranychus macfarlanei has emerged as a pest of several cultivated crop plants in India. 

Sign in / Sign up

Export Citation Format

Share Document