The specific status of the two cirratulid polychaetes, Dodecaceria fimbriata and D. caulleryi, compared by their morphology and methods of reproduction

1979 ◽  
Vol 57 (7) ◽  
pp. 1443-1451 ◽  
Author(s):  
Peter H. Gibson
Keyword(s):  
North Atlantic ◽  
The Body ◽  
Entire Body ◽  
Morphological Similarity ◽  
Type Specimens ◽  
Statistical Comparison ◽  
The North ◽  
The North Atlantic

Dodecaceria fimbriata and D. caulleryi occur on opposite sides of the north Atlantic. Because of their morphological similarity various authors have suggested that they may be the same species. Both reproduce by asexual fragmentation as atokes and then sexually as epitokes. The sizes of the entire body or regions of the body of three types of individual and two types of fragment produced asexually by each species were compared statistically. The numbers of one of the types of fragment were also compared. The result of this statistical comparison and the similarity in the methods of reproduction suggest that the species are the same. The type specimens for the atokes of the two species do not exist and therefore could not be compared. However, comparable specimens sampled from both sides of the Atlantic were found to be morphologically identical. On the basis of the quantitative and qualitative findings the two species are the same and therefore D. caulleryi should be called D. fimbriata.

Discovery and redescription of type material of Nausithoe simplex (Kirkpatrick, 1890), comb. nov. (Cnidaria: Scyphozoa: Coronatae: Nausithoidae) from the North Atlantic

Zootaxa ◽  
2012 ◽  
Vol 3320 (1) ◽  
pp. 61 ◽  
Author(s):  
ANDRÉ C. MORANDINI ◽  
GERHARD JARMS
Keyword(s):  
Natural History ◽  
North Atlantic ◽  
Natural History Museum ◽  
Type Material ◽  
Type Specimens ◽  
Morphometric Measurements ◽  
History Museum ◽  
The North ◽  
The North Atlantic

With discovery and examination of type specimens in the Natural History Museum, London, UK, we reassign Stephanoscyph-istoma simplex (Kirkpatrick, 1890) to the genus Nausithoe Kölliker, 1853, as Nausithoe simplex, comb. nov., and designate alectotype for the species. Use of morphometric measurements is considered important in coronate systematics, but key featuresalso include the unique whorl of internal cusps and the shape of these cusps. All previous records of N. simplex must be re-evaluated, taking into consideration the morphology of these internal cusps.

A revision of the genus Pseudoscopelus Lütken (Chiasmodontidae: Acanthomorphata) with descriptions of three new species

Zootaxa ◽  
2019 ◽  
Vol 2710 (1) ◽  
pp. 1 ◽  
Author(s):  
MARCELO R. S. MELO
Keyword(s):  
New Species ◽  
Indian Ocean ◽  
North Atlantic ◽  
South Atlantic ◽  
Valid Species ◽  
Type Specimens ◽  
Central Pacific ◽  
Distribution Maps ◽  
The North ◽  
The North Atlantic

Pseudoscopelus Lütken is a genus of meso- and bathypelagic fishes with a worldwide distribution. The genus is the most diversified within the family Chiasmodontidae, containing 16 valid species, three of which are described herein as new: Pseudoscopelus scriptus Lütken, from the western Central and North Atlantic; P. sagamianus Tanaka, from the Eastern Pacific and Indian Ocean; P. altipinnis Parr, widely distributed in the Atlantic and Pacific Oceans; P. cephalus Fowler, only known from the type locality in the Indo-Pacific; P. obtusifrons Fowler, from the Atlantic, Indian and Pacific Oceans; P. scutatus Krefft, widely distributed in the Atlantic, Indian and Pacific Oceans; P. aphos Prokofiev and Kukuev, from the western North Atlantic; P. parini Prokofiev and Kukuev, from the western Central Pacific to Hawaiian islands; P. astronesthidens Prokofiev and Kukuev, from the North Atlantic; P. australis Prokofiev and Kukuev, widely distribution in the southern parts of the Atlantic, Indian, Pacific Oceans, and in the Southern Ocean; P. pierbartus Spitz, Quéro and Vayne, from the North Atlantic and western South Atlantic; P. bothrorrhinos Melo, Walker Jr. and Klepadlo, from the western Pacific and Indian Ocean; P. lavenbergi Melo, Walker Jr. and Klepadlo, from the western North, western Central and western South Atlantic, P. paxtoni new species, from the western South Pacific; P. cordilluminatus new species, from the Indian Ocean and eastern South Atlantic; and P. odontoglossum new species, from the Central Pacific. Herein, Pseudoscopelus stellatus is placed in synonymy of P. scriptus; P. albeolus, in synonymy of P. australis; and P. vityazi, in synonymy of P. parini. Pseudoscopelus microps is confirmed as a junior synonym of P. altipinnis. A key to the species of Pseudoscopelus is provided as well as updated diagnoses, redescriptions, areas and distribution maps, based on extensive examination of collection material and comparison with type specimens.

scholarly journals A new species of Chaetozone (Polychaeta, Cirratulidae) from the Bay of Biscay offshore France, together with a review of Chaetozone species from the North Atlantic and adjacent waters

Zootaxa ◽  
2017 ◽  
Vol 4312 (3) ◽  
pp. 565
Author(s):  
JAMES A. BLAKE ◽  
NICOLAS LAVESQUE
Keyword(s):  
New Species ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Body Region ◽  
Methyl Green ◽  
Entire Body ◽  
Bay Of Biscay ◽  
The North ◽  
The North Atlantic ◽  
Muddy Sediments

A new cirratulid species of the genus Chaetozone has been discovered offshore in fine muddy sediments in the Bay of Biscay, France. This species is unusual in having an expanded fusiform anterior body region and numerous subdermal glands along the entire body that produce an elaborate and distinctive pattern when stained with Methyl Green. The new species is compared with closely related congeners and a review of Chaetozone species from the North Atlantic Ocean is presented. 

Neotype of Argis lar Compared with Argis dentata (Crustacea, Decapoda)

1964 ◽  
Vol 21 (3) ◽  
pp. 461-467
Author(s):  
H. J. Squires
Keyword(s):  
North Atlantic ◽  
North Pacific ◽  
Type Locality ◽  
Valid Species ◽  
Type Specimens ◽  
The North ◽  
The North Atlantic ◽  
Set Up ◽  
The North Pacific

The type specimens of Argis lar were collected in the north Pacific. They are no longer in existence. Specimens identified as A. lar by Rathbun, from the type locality and resembling the original specimens of Owen, are used to set up a neotype. This is done because some authors have assumed that specimens of Argis collected in the north Atlantic were A. lar and not A. dentata which they believed was not a valid species. Also the distribution of both species in northern Canadian waters is not yet clearly understood. Outstanding differences between the two species are discussed.

scholarly journals Diversity of late Neogene Monachinae (Carnivora, Phocidae) from the North Atlantic, with the description of two new species

2018 ◽  
Vol 5 (3) ◽  
pp. 172437 ◽  
Author(s):  
Leonard Dewaele ◽  
Carlos Mauricio Peredo ◽  
Pjotr Meyvisch ◽  
Stephen Louwye
Keyword(s):  
North America ◽  
North Atlantic ◽  
Late Miocene ◽  
East Coast ◽  
Type Specimens ◽  
The North ◽  
Late Neogene ◽  
New Material ◽  
The North Sea ◽  
The North Atlantic

While the diversity of ‘southern seals’, or Monachinae, in the North Atlantic realm is currently limited to the Mediterranean monk seal, Monachus monachus , their diversity was much higher during the late Miocene and Pliocene. Although the fossil record of Monachinae from the North Atlantic is mainly composed of isolated specimens, many taxa have been erected on the basis of fragmentary and incomparable specimens. The humerus is commonly considered the most diagnostic postcranial bone. The research presented in this study limits the selection of type specimens for different fossil Monachinae to humeri and questions fossil taxa that have other types of bones as type specimens, such as for Terranectes parvus . In addition, it is essential that the humeri selected as type specimens are (almost) complete. This questions the validity of partial humeri selected as type specimens, such as for Terranectes magnus . This study revises Callophoca obscura , Homiphoca capensis and Pliophoca etrusca , all purportedly known from the Lee Creek Mine, Aurora, North Carolina, in addition to their respective type localities in Belgium, South Africa and Italy, respectively. C. obscura is retained as a monachine seal taxon that lived both on the east coast of North America and in the North Sea Basin. However, H. capensis from North America cannot be identified beyond the genus level, and specimens previously assigned to Pl. etrusca from North America clearly belong to different taxa. Indeed, we also present new material and describe two new genera of late Miocene and Pliocene Monachinae from the east coast of North America: Auroraphoca atlantica nov. gen. et nov. sp., and Virginiaphoca magurai nov. gen. et nov. sp. This suggests less faunal interchange of late Neogene Monachinae between the east and west coasts of the North Atlantic than previously expected.

News about the reproductive ecology of the southern conger eel Conger orbignianus

2009 ◽  
Vol 90 (3) ◽  
pp. 461-465 ◽  
Author(s):  
Daniel E. Figueroa ◽  
Gustavo Macchi ◽  
Manuel Haimovici
Keyword(s):  
Adipose Tissue ◽  
North Atlantic ◽  
Abdominal Cavity ◽  
The Body ◽  
Southern Brazil ◽  
The North ◽  
Deep Waters ◽  
The World ◽  
The North Atlantic ◽  
Conger Eel

Congrids inhabit the warm and temperate seas of the world, from the coastline to the slope of various continents. Many of its species are much valued by commercial and artisan fishing; nevertheless, at world level, there is great ignorance about the life cycle of the members of this genus. Some species of the genus, such as those from the North Atlantic, appear to be semelparous, for they cease feeding, decalcify, loose their teeth and migrate to deep waters to spawn. Specimens of the southern conger eel Conger orbignianus were examined for the purpose of learning about their biology in waters of the western South Atlantic. Histological sections were analysed from ovaries of coastal conger specimens from the North Argentina coastal littoral, the Argentine Sea deep waters, and the giant congers from southern Brazil. Two oocitary generations have been observed in coastal females typical of total spawners, with a previtellogenetic batch that does not reach maturity, and a vitellogenetic batch that does it together with its size, completely surrounded by adipose tissue. The ovaries of fish captured in deep waters occupied the whole abdominal cavity, with scarce adipose tissue and degraded body. The giant congers from southern Brazil were captured in very deep waters, healthy, with few atretic oocytes and abundant adipose tissue. Evidence of semelparity was found in the southern conger eel; the asistosis stage, the body degradation during the reproductive migration and gigantism might be common attributes in other species of the genus.

scholarly journals Population comparison of right whale body condition reveals poor state of the North Atlantic right whale

2020 ◽  
Vol 640 ◽  
pp. 1-16 ◽  
Author(s):  
F Christiansen ◽  
SM Dawson ◽  
JW Durban ◽  
H Fearnbach ◽  
CA Miller ◽  
...  
Keyword(s):  
Body Condition ◽  
North Atlantic ◽  
Good Condition ◽  
The Body ◽  
North Atlantic Right Whale ◽  
Poor Condition ◽  
Right Whale ◽  
The North ◽  
The Poor ◽  
The North Atlantic

The North Atlantic right whale Eubalaena glacialis (NARW), currently numbering <410 individuals, is on a trajectory to extinction. Although direct mortality from ship strikes and fishing gear entanglements remain the major threats to the population, reproductive failure, resulting from poor body condition and sublethal chronic entanglement stress, is believed to play a crucial role in the population decline. Using photogrammetry from unmanned aerial vehicles, we conducted the largest population assessment of right whale body condition to date, to determine if the condition of NARWs was poorer than 3 seemingly healthy (i.e. growing) populations of southern right whales E. australis (SRWs) in Argentina, Australia and New Zealand. We found that NARW juveniles, adults and lactating females all had lower body condition scores compared to the SRW populations. While some of the difference could be the result of genetic isolation and adaptations to local environmental conditions, the magnitude suggests that NARWs are in poor condition, which could be suppressing their growth, survival, age of sexual maturation and calving rates. NARW calves were found to be in good condition. Their body length, however, was strongly determined by the body condition of their mothers, suggesting that the poor condition of lactating NARW females may cause a reduction in calf growth rates. This could potentially lead to a reduction in calf survival or an increase in female calving intervals. Hence, the poor body condition of individuals within the NARW population is of major concern for its future viability.

The Currents of the North Atlantic

1892 ◽  
Vol 34 (872supp) ◽  
pp. 13940-13941
Author(s):  
Richard Beynon
Keyword(s):  
North Atlantic ◽  
The North ◽  
The North Atlantic

NATO adaptation to current challenges and mechanisms of Ukraine’s cooperation with the North Atlantic Treaty Organization

2019 ◽  
pp. 73-81
Author(s):  
Oleh Poshedin
Keyword(s):  
North Atlantic ◽  
Task Force ◽  
Response Force ◽  
Cyber Attack ◽  
Adaptation Measures ◽  
Joint Force ◽  
Security Environment ◽  
The North ◽  
The North Atlantic ◽  
Area Of Influence

The purpose of the article is to describe the changes NATO undergoing in response to the challenges of our time. Today NATO, as a key element of European and Euro-Atlantic security, is adapting to changes in the modern security environment by increasing its readiness and ability to respond to any threat. Adaptation measures include the components required to ensure that the Alliance can fully address the security challenges it might face. Responsiveness NATO Response Force enhanced by developing force packages that are able to move rapidly and respond to potential challenges and threats. As part of it, was established a Very High Readiness Joint Task Force, a new Allied joint force that deploy within a few days to respond to challenges that arise, particularly at the periphery of NATO’s territory. NATO emphasizes, that cyber defence is part of NATO’s core task of collective defence. A decision as to when a cyber attack would lead to the invocation of Article 5 would be taken by the North Atlantic Council on a case-by-case basis. Cooperation with NATO already contributes to the implementation of national security and defense in state policy. At the same time, taking into account that all decision-making in NATO based on consensus, Ukraine’s membership in the Alliance quite vague perspective. In such circumstances, in Ukraine you often can hear the idea of announcement of a neutral status. It is worth reminding that non-aligned status did not save Ukraine from Russian aggression. Neutral status will not accomplish it either. All talks about neutrality and the impossibility of Ukraine joining NATO are nothing but manipulations, as well as recognition of the Ukrainian territory as Russian Federation area of influence (this country seeks to sabotage the Euro-Atlantic movement of Ukraine). Think about it, Moldova’s Neutrality is enshrined in the country’s Constitution since 1994. However, this did not help Moldova to restore its territorial integrity and to force Russia to withdraw its troops and armaments from Transnistria.

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