Two new Diastylis (Cumacea: Diastylidae) from Antarctic waters: Diastylis andeepae and D. catalinae

Zootaxa ◽  
2010 ◽  
Vol 2440 (1) ◽  
pp. 33 ◽  
Author(s):  
NATALIA ALBERICO ◽  
UTE MÜHLENHARDT-SIEGEL
Keyword(s):  
Related Species ◽  
Deep Sea ◽  
Short Distance ◽  
Anterior Part ◽  
Weddell Sea ◽  
Bay Of Biscay ◽  
Closely Related Species ◽  
Inferior Margin ◽  
Antarctic Waters ◽  
Simple Seta

Two new deep-sea cumaceans, Diastylis andeepae and D. catalinae are described from the Weddell Sea. Diastylis andeepae n. sp. can be distinguished from other members of the genus by a combination of characters including: carapace with small tubercles all over and anterior part with an arched row of teeth extending from each side of the pseudorostrum and disappearing a short distance before reaching the inferior margin of the carapace, ischium of the pereopod 2 with four strong teeth, endopod uropod of two articles. Diastylis catalinae n. sp. is a closely related species to D. richardi Fage 1929 recorded from the Bay of Biscay, however D. catalinae can be easily separated from D. richardi by having: (1) on each side of the anterior part of the carapace several teeth arranged in two non-uniform rows (randomly distributed and with two antero−lateral horns in D. richardi); (2) clearly visible pereonites 1 and 2 in dorsal view (hardly visible in D. richardi); (3) one tooth on each postero−lateral angle of the pereonite 5 (without teeth in D.richardi); and (4) one minute simple seta on article 4 of the antenna 2 (a long setulate seta in D. richardi).

scholarly journals Deep sea without limits—four new closely related species of Emertonia Wilson, 1932 (Copepoda: Harpacticoida: Paramesochridae) show characters with a world-wide distribution

Zootaxa ◽  
2021 ◽  
Vol 5051 (1) ◽  
pp. 443-486
Author(s):  
ANNABEL MATHISKE ◽  
DAVID THISTLE ◽  
HENDRIK GHEERARDYN ◽  
GRITTA VEIT-KÖHLER
Keyword(s):  
Related Species ◽  
Deep Sea ◽  
Large Scale ◽  
Wide Distribution ◽  
Weddell Sea ◽  
Closely Related Species ◽  
The Pacific ◽  
Harpacticoid Copepods ◽  
The Family ◽  
Biogeographical Pattern

The large-scale dispersal of deep-sea harpacticoid copepods is an increasing focus for ecological studies. A fundamental prerequisite for monitoring and explaining their geographical distribution is precise descriptions of their morphology. Four new, closely related species of the family Paramesochridae (Copepoda, Harpacticoida) were found in the deep sea of the Pacific (San Diego Trough and off Chile), the Atlantic Ocean (Porcupine Abyssal Plain and Angola Basin), and the Atlantic and Indian Ocean sectors of the Southern Ocean (Weddell Sea and off Crozet Island). The discovery of Emertonia berndi sp. nov., E. hessleri sp. nov., E. ilse sp. nov., and E. serrata sp. nov. increases the number of known deep-sea species in this genus to ten. The new species are placed in Emertonia Wilson, 1932 because of their one-segmented endopods on the second and third swimming legs. The presence of a two-segmented endopod on the fourth swimming leg allocates them to the “andeep-group” within this genus. The four species can be distinguished from their congeners by the strongly serrated spines on the exopods of their swimming legs and an outwardly directed flexible seta on the exopod of the fifth leg. It is conveivable that these two specific characters evolved only once in the genus Emertonia. Their apparently cosmopolitan distribution covers thousands of kilometres and spans all major oceans. This biogeographical pattern may be explained by resuspension events followed by passive transport by benthic currents. Discrepancies in their dispersal ranges may be a result of changing geological and oceanographic boundaries.  

Misidentification and notes on Plesionika semilaevis, Spence Bate, 1888 (Crustacean: Decapoda: Caridea) from the southern coast of India

Zootaxa ◽  
2020 ◽  
Vol 4861 (2) ◽  
pp. 297-300
Author(s):  
G. KUBERAN ◽  
REKHA DEVI CHAKRABORTY ◽  
G. MAHESWARUDU
Keyword(s):  
16S Rdna ◽  
Related Species ◽  
Deep Sea ◽  
Genetic Divergence ◽  
Morphological Characters ◽  
Southern Coast ◽  
Caridean Shrimp ◽  
Closely Related Species ◽  
Important Species ◽  
Indian Waters

The commercial deep-sea caridean shrimp Plesionika martia (Milne-Edwards 1883) has long been recorded from India and constitutes an important species of deep-sea shrimp catches in the southern coast of India. However, the present study revealed that all the previous records of “Plesionika martia” is actually a misidentification of the closely related species P. semilaevis, which was recently obtained from Indian waters. The specimens were collected from three fish landing harbours (Sakthikulangara, Kalamuku, and Tuticorin) fished from the depth of about 150–250 m along the southern coast of India during 2014 to 2017. The level of interspecies genetic divergence between 16S rDNA (16.8–18.6%) and COI (26.1%) sequences of the Indian P. semilaevis and P. martia sequence retrieved from NCBI were found to be comparatively high. The current work illustrates the detailed morphological characters with color photographs of the species, P. semilaevis off the Indian Exclusive Economic Zone (EEZ). 

New Mysida (Crustacea) in the genera Amblyops and Pseudomma from the Iceland Basin

Zootaxa ◽  
2007 ◽  
Vol 1628 (1) ◽  
pp. 43-58 ◽  
Author(s):  
KENNETH MELAND ◽  
TORLEIV BRATTEGARD
Keyword(s):  
New Species ◽  
Deep Sea ◽  
Species Range ◽  
Full Description ◽  
Bay Of Biscay ◽  
Close Resemblance ◽  
Iceland Basin ◽  
Antarctic Waters ◽  
Dispersal Barriers ◽  
Mid Atlantic Ridge

Five species of Erythropinae are described from the Iceland Basin. Amblyops trisetosa and A. spinifera are shown to have extended their species range from the Bay of Biscay to Iceland. Pseudomma maasaki and P. islandicum are described as new species. A full description of P. antarcticum, previously reported only from Antarctic waters, is presented, including a first description of the male pleopods. The extended northward distribution of the previously described species coupled with P. islandicum bearing close resemblance to Antarctic Pseudomma species indicates the absence of dispersal barriers for bottom-living mysids in the Atlantic deep sea east of the mid-Atlantic Ridge.

Rhabdias mcguirei sp. nov. (Nematoda, Rhabdiasidae) from the flying lizard, Draco spilopterus (Squamata, Agamidae) of the northern Philippines

2011 ◽  
Vol 56 (4) ◽  
Author(s):  
Vasyl Tkach ◽  
Yuriy Kuzmin ◽  
Rafe Brown
Keyword(s):  
New Species ◽  
Related Species ◽  
Anterior Part ◽  
Buccal Capsule ◽  
The Body ◽  
Closely Related Species ◽  
Oral Opening

AbstractRhabdias mcguirei sp. nov., is described on the basis of specimens found in the lungs of northern Philippine flying lizards, Draco spilopterus (Reptilia, Agamidae) collected in Aurora province, Luzon Island, Philippines. It is characterized by a rounded oral opening, a buccal capsule consisting of anterior and posterior parts, and the shape of the cuticular inflation in the anterior part of the body: the cuticle is less inflated in the anterior-most part, with the inflation gradually thickening up to the level of the oesophageal-intestinal junction. The new species is differentiated from the 11 most closely related species of Rhabdias previously known from lizards.

Microsatellite Marker: Importance and Implications of Cross-genome Analysis for Finger Millet (Eleusine coracana (L.) Gaertn)

2020 ◽  
Vol 9 (3) ◽  
pp. 160-170
Author(s):  
Thumadath P.A. Krishna ◽  
Maharajan Theivanayagam ◽  
Gurusunathan V. Roch ◽  
Veeramuthu Duraipandiyan ◽  
Savarimuthu Ignacimuthu
Keyword(s):  
Molecular Marker ◽  
Microsatellite Markers ◽  
Ssr Markers ◽  
Genome Analysis ◽  
Related Species ◽  
Finger Millet ◽  
Crop Improvement ◽  
Human Beings ◽  
Closely Related Species ◽  
Genome Amplification

Finger millet is a superior staple food for human beings. Microsatellite or Simple Sequence Repeat (SSR) marker is a powerful tool for genetic mapping, diversity analysis and plant breeding. In finger millet, microsatellites show a higher level of polymorphism than other molecular marker systems. The identification and development of microsatellite markers are extremely expensive and time-consuming. Only less than 50% of SSR markers have been developed from microsatellite sequences for finger millet. Therefore, it is important to transfer SSR markers developed for related species/genus to finger millet. Cross-genome transferability is the easiest and cheapest method to develop SSR markers. Many comparative mapping studies using microsatellite markers clearly revealed the presence of synteny within the genomes of closely related species/ genus. Sufficient homology exists among several crop plant genomes in the sequences flanking the SSR loci. Thus, the SSR markers are beneficial to amplify the target regions in the finger millet genome. Many SSR markers were used for the analysis of cross-genome amplification in various plants such as Setaria italica, Pennisetum glaucum, Oryza sativa, Triticum aestivum, Zea mays and Hordeum vulgare. However, there is very little information available about cross-genome amplification of these markers in finger millet. The only limited report is available for the utilization of cross-genome amplified microsatellite markers in genetic analysis, gene mapping and other applications in finger millet. This review highlights the importance and implication of microsatellite markers such as genomic SSR (gSSR) and Expressed Sequence Tag (EST)-SSR in cross-genome analysis in finger millet. Nowadays, crop improvement has been one of the major priority areas of research in agriculture. The genome assisted breeding and genetic engineering plays a very crucial role in enhancing crop productivity. The rapid advance in molecular marker technology is helpful for crop improvement. Therefore, this review will be very helpful to the researchers for understanding the importance and implication of SSR markers in closely related species.

Loss of sleep or loss of dark?

2018 ◽  
Author(s):  
Richard G. Stevens
Keyword(s):  
Mood Disorders ◽  
Deep Sea ◽  
Short Distance ◽  
Water Surface ◽  
Ocean Floor ◽  
Physiological Adaptation ◽  
Poor Sleep ◽  
Short Period ◽  
The World ◽  
Night And Day

Before electricity, night was something akin to the deep sea: just as we could not descend much below the water surface, we also could not investigate the night for more than a short distance, and for a short period of time. Things changed with two inventions: the Bathysphere to plumb the ocean floor, and electricity to light the night for sustained exploration. Exploration led to dominance, and night has become indistinguishable from day in many parts of the world. The benefits of electric light are myriad, but so too are the possible detriments of loss of dark at night, including poor sleep, obesity, diabetes, cancer, and mood disorders. Our primordial physiological adaptation to the night and day cycle is being flummoxed by the maladaptive signals coming from electric lighting around the clock. The topic of sleep and health has finally attained scientific respect, but dark and health is not yet fully appreciated.

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