scholarly journals The first record of Tremoctopus violaceus sensu stricto Delle Chiaje,1830 in southwestern Gulf of Mexico gives a hint of the taxonomic status of Tremoctopus gracilis

ZooKeys ◽  
2021 ◽  
Vol 1012 ◽  
pp. 55-69
Author(s):  
María de Lourdes Jiménez-Badillo ◽  
César Meiners-Mandujano ◽  
Gabriela Galindo-Cortes ◽  
Piedad S. Morillo-Velarde ◽  
Roberto González-Gómez ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Gulf Of Mexico ◽  
Taxonomic Status ◽  
Interspecific Variation ◽  
First Record ◽  
Mature Female ◽  
Egg Mass ◽  
Meristic Characters ◽  
The Pacific ◽  
The Pacific Ocean

Knowledge on species taxonomic identity is essential to understand biological and biogeographical processes and for studies on biodiversity. Species the genus Tremoctopus have been confused in the past and are inconsistently identified. To clarify of the taxonomic diagnosis Tremoctopus violaceus Delle Chiaje, 1830, an evaluation of morphological and meristic characters, as well as morphometric indices and genetic analyses, was undertaken. The analyzed octopod was an opportunistically collected mature female of 640 mm in total length, with a mantle length of 135 mm and a total weight of 1.02 kg. Evidence of autotomy as a defensive mechanism for protecting the egg mass is presented. The 16S haplotype sequenced from this specimen represents the first one publicly available for this species from the Gulf of Mexico. The genetic divergence between this haplotype and those reported from the Pacific Ocean is representative of interspecific variation in other taxa, which suggests that “T. violaceus” in the Pacific Ocean (KY649286, MN435565, and AJ252767) should be addressed as T. gracilis instead. Genetic evidence to separate T. violaceus and T. gracilis is presented. The studied specimen from the Gulf of Mexico represents the westernmost known occurrence of T. violaceus and the first record from the southwestern Gulf of Mexico.

Taxonomy of the genus Thyonella (Holothuroidea: Dendrochirotida), with mention of the first record of T. sabanillaensis from the southwestern Atlantic Ocean

Zootaxa ◽  
2018 ◽  
Vol 4527 (1) ◽  
pp. 75
Author(s):  
LUCIANA MARTINS
Keyword(s):  
Pacific Ocean ◽  
Atlantic Ocean ◽  
First Record ◽  
Morphological Characters ◽  
Sem Analysis ◽  
Southwestern Atlantic ◽  
Internal Morphology ◽  
The Pacific ◽  
Southwestern Atlantic Ocean ◽  
The Pacific Ocean

The genus Thyonella currently comprises four species which occur in the Atlantic and Pacific Oceans. Thyonella mexicana is the only species known to occur in the Pacific Ocean. The main morphological characters used to distinguish Thyonella species are their dermal ossicles. Since the differences among these characters are subtle, this contribution provides a detailed description and comparison of the ossicle assemblage of the concerned taxa. In addition, description of the internal morphology of three of the concerned species is also provided. Further, this study reports on the first record of Thyonella sabanillaensis for the Southwestern Atlantic. A worldwide revision of the distributional records of Thyonella species is presented and their taxonomy is discussed, concluding that some traditional taxonomic characters should be used cautiously. A brief discussion about the importance of SEM analysis is also provided. 

First record of Asteronema rhodochortonoides (Phaeophyceae) for the Pacific Ocean

2001 ◽  
Vol 49 (4) ◽  
pp. 281-284 ◽  
Author(s):  
Kazuhiro Kogame ◽  
Shinya Uwai ◽  
Shigeo Kawaguchi
Keyword(s):  
Pacific Ocean ◽  
First Record ◽  
The Pacific ◽  
The Pacific Ocean

First record of Hyalascus (Hexactinellida: Rossellidae) from the Indian Ocean, with description of a new species from a volcanic seamount in the Andaman Sea

Zootaxa ◽  
2010 ◽  
Vol 2667 (1) ◽  
pp. 64 ◽  
Author(s):  
SABYASACHI SAUTYA ◽  
KONSTANTIN R. TABACHNICK ◽  
BABAN INGOLE
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
Indian Ocean ◽  
First Record ◽  
Andaman Sea ◽  
The Pacific ◽  
The Indian Ocean ◽  
The Pacific Ocean ◽  
Back Arc ◽  
A New Species

A new species of Hyalascus is described from the submarine volcanic crater seamount of Andaman Back-arc Basin, Indian Ocean. The genus was previously known in the Pacific Ocean only.

RECORDS OF CYAMUS BALAENOPTERAE BARNARD AND NEOCYAMUS PHYSETERIS (POUCHET), TWO SPECIES OF WHALE-LICE (AMPHIPODA), FROM THE NORTHEAST PACIFIC

1959 ◽  
Vol 37 (6) ◽  
pp. 895-897 ◽  
Author(s):  
L. Margolis
Keyword(s):  
Pacific Ocean ◽  
First Record ◽  
Physeter Macrocephalus ◽  
Balaenoptera Acutorostrata ◽  
Northeast Pacific ◽  
The Pacific ◽  
The Pacific Ocean ◽  
First Time

Cyamus balaenopterae Barnard from Balaenoptera acutorostrata and Neocyamus physeteris (Pouchet) from Physeter macrocephalus are reported for the first time from the Pacific Ocean. This is the first record of a cyamid from B. acutorostrata.

Tephrochronology of the Western Gulf of Mexico for the Last 185,000 Years

1985 ◽  
Vol 23 (3) ◽  
pp. 403-416 ◽  
Author(s):  
Karen Rabek ◽  
Michael T. Ledbetter ◽  
Douglas F. Williams
Keyword(s):  
Pacific Ocean ◽  
Gulf Of Mexico ◽  
Accurate Method ◽  
Equatorial Pacific ◽  
Equatorial Pacific Ocean ◽  
Eastern Equatorial Pacific ◽  
Oxygen Isotope Stratigraphy ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Eastern Equatorial Pacific Ocean

Tephra in 31 piston cores from the western Gulf of Mexico and 7 piston cores from the equatorial Pacific were analyzed by electron microprobe. Six ash layers in the western Gulf of Mexico were easily distinguished by TiO2, FeO, and CaO contents and correlated by geochemistry in order to determine the distribution pattern for each ash layer. Correlation by geochemistry is an easier, more accurate method than biostratigraphic correlation; some of the tephras were miscorrelated by biostratigraphy. The six tephras were dated by geochemical identification in a piston core with oxygen-isotope stratigraphy and the ages are Y5 (30,000 yr B.P.), Y6 (65,000 yr B.P.), Y8 (84,000 yr B.P.), X2 (110,000 yr B.P.), W1 (136,000 yr B.P.), and W2 (185,000 yr B.P.). Data from this study corroborated correlations of the Y8 tephra in the western Gulf of Mexico with the D layer in the eastern equatorial Pacific Ocean. None of the other five layers in the Gulf of Mexico, however, were found in the Pacific Ocean. The limited distribution of the Y5, Y6, X2, and W2 ash layers close to Mexico indicates possible sources in Mexico. Tephra from the late Pleistocene La Primavera pumice in Mexico, however, does not correlate with the marine tephra.

On the occurrence of Davainea madagascariensis on the African mainland

1947 ◽  
Vol 22 (1) ◽  
pp. 47-48
Author(s):  
Phyllis A. Clapham
Keyword(s):  
Pacific Ocean ◽  
First Record ◽  
Human Patient ◽  
Human Parasite ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Comoro Islands

Davainea madagascariensis is a rather rare human parasite, there being less than a dozen cases on record. It was originally described from children in the Comoro Islands by Davaine in 1869 under the name Taenia madagascariensis and has since been recorded from a wider area stretching from Madagascar and the neighbouring islands through Siam to the Philippine Islands in the Pacific Ocean. Recently some cestode segments were sent to Dr. R. T. Leiper, C.M.G., F.R.S. They had been passed in the stool of a human patient in S.E. Africa. They have now been identified as gravid segments of Davainea madagascariensis and this would seem to be the first record of the species from the mainland of Africa.

Distribution and Synonymy in the Pacific Ocean, and Variation, of the Greenland Halibut, Reinhardtius hippoglossoides (Walbaum)

1964 ◽  
Vol 21 (5) ◽  
pp. 1129-1154 ◽  
Author(s):  
Carl L. Hubbs ◽  
Norman J. Wilimovsky
Keyword(s):  
Pacific Ocean ◽  
Bering Sea ◽  
Single Species ◽  
Greenland Halibut ◽  
Meristic Characters ◽  
Morphometric Characters ◽  
Alaska Peninsula ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Reinhardtius Hippoglossoides

Long known in the Pacific Ocean from a single specimen from east-central Japan, the very distinctive flatfish genus Reinhardtius has been shown since 1930 to maintain a population of commercial significance from northern Japan to northwestern Bering Sea. It is now found to be common also in eastern Bering Sea, and to occur also just south of the tip of the Alaska Peninsula, in northern and central California, and even at the extreme north of Baja California, Mexico. Japan and the Californias appear to be inhabited by non-breeding expatriates, whose wanderings are attributable to the free-swimming habits and prolonged early pelagic development of the species. Lack of records between the Alaska Peninsula and California may possibly indicate actual absence, attributable to current pattern. Analysis of the only morphometric characters thought to be indicative of subspecific differentiation between the Pacific and Atlantic stocks discloses no basis for such separation, nor do any meristic characters disclose such a basis. The single species Reinhardtius hippoglossoides is therefore regarded as a uniquely undifferentiated amphiboreal taxon. The chief distinction between the ocean stocks lies in the number of vertebrae, but the differentiation (probably genetic) is not beyond the racial level. The difference in vertebral numbers, surprisingly, is not paralleled by a difference in numbers of dorsal or anal rays; nor is there any marked correlation between vertebral and ray numbers. As expected, the numbers of dorsal and anal rays are found to be positively correlated, and the number of precaudal and caudal vertebrae to be negatively correlated. In this flatfish of relatively limited asymmetry the numbers of rays are virtually identical in the two pectoral fins. Two reversed examples of the species are reported.

scholarly journals V.—Preliminary Notes on the Late Connection and Separation of the Pacific Ocean and Gulf of Mexico

1895 ◽  
Vol 2 (7) ◽  
pp. 306-308
Author(s):  
J. W. Spencer
Keyword(s):  
Pacific Ocean ◽  
Gulf Of Mexico ◽  
West Indies ◽  
Additional Data ◽  
American Continent ◽  
The West ◽  
The Pacific ◽  
Pleistocene Period ◽  
The Pacific Ocean ◽  
Geological Magazine

Having recently returned from another season's work in the West Indies and Mexico, where I was collecting additional data bearing upon the stupendous changes of level of land and sea which have lately affected the American continent, I find the review of the “Reconstruction of the Antillean Continent” by Mr. Jukes-Browne in the Geological Magazine, April 1895, p. 173, a few points of which may be further explained at the same time that I furnish some advance notes concerning recently observed phenomena which greatly strengthen the theory of stupendous changes of level in the Pleistocene period. Many months must elapse before I shall be able to complete the studies for publication, so that my papers on Cuba, Jamaica, and Mexico shall be published.

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