Distribution of genus Jassa (Amphipoda, Ischyroceridae) in the Bay of Campeche, SW Gulf of Mexico, with description of a new deepwater species

2020 ◽  
Author(s):  
Ignacio Winfield ◽  
María Teresa Herrera-Dorantes ◽  
Pedro-Luis Ardisson
Keyword(s):  
New Species ◽  
Gulf Of Mexico ◽  
Continental Shelf ◽  
River Basin ◽  
Deep Sea ◽  
Shallow Waters ◽  
Soft Bottom ◽  
Bathymetric Distribution ◽  
Terminos Lagoon

The genus Jassa includes 36 species distributed mainly in shallow waters as biofoulers on human-made structures or associated with living or inert soft bottom substrata worldwide. During the oceanographic cruise “2013-PEMEX Exploración y Produción, Regiones Marinas” in the southwestern Gulf of Mexico, several benthic amphipods of the genus Jassa were collected in sediments of both the continental shelf and the deep benthic sea. The present study examined the geographic and bathymetric distribution of Jassa in the Campeche Salt Basin, SW Gulf of Mexico, and described a new Jassa species collected below the isobath of 200 m. The species Jassa marmorata and Jassa morinoi were recorded mainly in front of the Usumacinta/Grijalva River Basin and Terminos Lagoon Delta, between 21 and 55 m depth. In contrast, the new species was recorded in the Bay of Campeche and the Campeche Canyon, below 450 m depth. For J. morinoi, it is the first register in the Gulf of Mexico. The new species increased the number of Jassa species documented worldwide to 37, and that of the deep-sea benthic amphipods from the Gulf of Mexico to 19 species.

scholarly journals First record of the genus Oediceroides (Amphipoda: Amphilochidea: Oedicerotidae) for the Gulf of Mexico, with the description of a new species

2021 ◽  
pp. 18-27
Author(s):  
Carlos Varela ◽  
Heather D. Bracken-Grissom
Keyword(s):  
New Species ◽  
Gulf Of Mexico ◽  
Shallow Water ◽  
Mediterranean Sea ◽  
Deep Water ◽  
Deep Sea ◽  
First Record ◽  
Shallow Waters ◽  
Deep Waters ◽  
A New Species

The genus Oediceroides Stebbing, 1888 represents a group of 23 species of amphipods that live from shallow coastal areas to abyssal plains. Most of these species have been collected in deep waters from localities in the South Atlantic and Pacific Oceans, and only one species has been found in the Mediterranean Sea. Many oediceroids inhabit waters more than 200 meters deep with only four species confined to shallow waters. This is the first occasion in which a species belonging to the genus Oediceroides is recorded for the Gulf of Mexico. Here, we describe O. improvisus sp. nov., a species of marine deep-water amphipod collected in 925 meters of water. This species has carapace, mouthpart and pereopodal characters that unite it with other members of the genus. It differs from all other species due to unique rostral and pereopod seven characters, all discussed in detail further in this description. To date, only 20 deep-sea (>200 meters) benthic amphipods have been recorded in the Gulf of Mexico, in comparison with more than 200 species of shallow water representatives from the same region. Our study provides evidence that the deep waters of the Gulf of Mexico still hold undescribed biodiversity.

Whale falls, multiple colonisations of the deep, and the phylogeny of Hesionidae (Annelida)

2015 ◽  
Vol 29 (2) ◽  
pp. 105 ◽  
Author(s):  
Mindi Summers ◽  
Fredrik Pleijel ◽  
Greg W. Rouse
Keyword(s):  
New Species ◽  
Maximum Likelihood ◽  
16S Rrna ◽  
Deep Sea ◽  
Phylogenetic Relationships ◽  
18S Rrna ◽  
Shallow Waters ◽  
28S Rrna ◽  
Mitochondrial Cytochrome ◽  
New Members

Phylogenetic relationships within Hesionidae Grube, 1850 are assessed via maximum parsimony and maximum likelihood analyses of mitochondrial (cytochrome c oxidase subunit I and 16S rRNA) and nuclear (18S rRNA, and 28S rRNA) data. The analyses are based on 42 hesionid species; six of these being new species that are described here. The new species, all from deep (>200 m depth) benthic environments (including whale falls) in the eastern Pacific, are Gyptis shannonae, sp. nov., Neogyptis julii, sp. nov., Sirsoe sirikos, sp. nov., Vrijenhoekia ketea, sp. nov., Vrijenhoekia falenothiras, sp. nov., and Vrijenhoekia ahabi, sp. nov. The molecular divergence among the new members of Vrijenhoekia is pronounced enough to consider them cryptic species, even though we cannot distinguish among them morphologically. Our results also showed that the subfamily Hesioninae Grube, 1850, as traditionally delineated, was paraphyletic. We thus restrict Hesioninae to include only Hesionini Grube, 1850 and refer the remaining members to Psamathinae Pleijel, 1998. The present study increases the number of hesionid species associated with whale falls from one to six and markedly increases the number of described deep-sea hesionid taxa. There appear to have been multiple colonisations of the deep sea from shallow waters by hesionids, though further sampling is warranted.

Description of three new species of Ampelisca (Crustacea: Amphipoda: Ampeliscidae) from Southwestern Atlantic, with a key of the genus for Brazilian species

Zootaxa ◽  
2007 ◽  
Vol 1626 (1) ◽  
pp. 25-37 ◽  
Author(s):  
MARIA TERESA VALÉRIO-BERARDO
Keyword(s):  
New Species ◽  
Atlantic Ocean ◽  
Continental Shelf ◽  
Benthic Communities ◽  
Brazilian Coast ◽  
Southwestern Atlantic ◽  
Soft Bottom ◽  
Brazilian Species ◽  
Southwestern Atlantic Ocean ◽  
Three New Species

Ampelisca species are inhabitant of soft bottom marine benthic communities of tropical to cold – temperate zones. Prior to this paper, 11 species of the genus were recognized from Brazilian coast. Three new species of Ampelisca are herein described: Ampelisca longipropoda, Ampelisca meridionalis and Ampelisca youngi. The specimens were dredged from the continental shelf of Southwestern Atlantic Ocean between the latitudes 22°06’S and 34°32’S. A key to the Ampelisca species of the Brazilian coast is provided.

scholarly journals A New Deep-Sea Enhydrosoma (Copepoda, Harpacticoida, Cletodidae) from the Northern Gulf of Mexico

Taxonomy ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 23-36
Author(s):  
Eun-Ok Park ◽  
Melissa Rohal ◽  
Wonchoel Lee
Keyword(s):  
New Species ◽  
Gulf Of Mexico ◽  
Deep Sea ◽  
Caudal Ramus ◽  
Northern Gulf Of Mexico ◽  
Mandibular Palp ◽  
Northwestern Mexico ◽  
Thoracic Legs

Enhydrosoma texana sp. nov. is described from the northern Gulf of Mexico. The new species is closely related to E. parapropinquum Gómez, 2003 from northwestern Mexico. Both species share several characters including an elongated cylindrical caudal ramus, an abexopodal seta of antennae, the structure of mouthpart appendages, seta formula of thoracic legs P1–P4, the shape of the P5 exopod in the female and the apophysis structure of P3 in males. However, the new species is distinguishable from E. parapropinquum by the shape of the rostrum, number of the antennular segments, the shape of the mandibular palp, the relative lengths of the thoracic legs, the shape of the apophysis of P3 in the male, setal number and length of the P5 exopod of the female, the length of the seta on P5 in the male and the relative lengths of the caudal ramus in both sexes. This is the deepest record of a species in the genus Enhydrosoma.

Two new species of the Phimochirus holthuisi complex from the Gulf of Mexico, supported by morphology, color, and genetics (Crustacea: Anomura: Paguridae)

Zootaxa ◽  
2019 ◽  
Vol 4683 (4) ◽  
pp. 531-551
Author(s):  
DARRYL L. FELDER ◽  
RAFAEL LEMAITRE ◽  
CATHERINE CRAIG
Keyword(s):  
New Species ◽  
Gulf Of Mexico ◽  
Continental Shelf ◽  
Gene Sequence ◽  
Sequence Data ◽  
Phylogenetic Analyses ◽  
The Other ◽  
Two New Species ◽  
Molecular Phylogenetic ◽  
Gene Sequence Data

Coloration, gene-sequence data (H3, 12s, 16s), and subtle features in morphology support the description of two new species, both formerly regarded to represent accepted variants of Phimochirus holthuisi s.l. While color in life consistently separates these species from P. holthuisi s.s. and from each other, morphological distinctions are subtle and less than absolute in small specimens, being based on ventral spine counts of walking leg dactyls and relative development of the superior crest on the major chela. Molecular phylogenetic analyses clearly support the separation of sister clades, representing two new species, from P. holthuisi s.s. as well as other congeners available for analysis. Both of the new species are presently known to occur widely throughout the northern Gulf of Mexico, though one occurs more commonly in the northeastern and southeastern Gulf, and may range as far south as Suriname. The other has been taken primarily in the northwestern Gulf, and is not known from outside Gulf waters. While both of the new species appear restricted to relatively deep subtidal waters of the continental shelf, Phimochirus holthuisi s.s. is instead more commonly found in shallow nearshore tropical waters on or near coral reefs. Previous literature reports of P. holthuisi usually represent, at least in part, one or both of these two new species. 

scholarly journals Records of plutonium isotopes in marine sediments from the southern Gulf of Mexico

2021 ◽  
Author(s):  
Jose A. Corcho Alvarado ◽  
Misael Diaz-Asenciuo ◽  
Stefan Röllin ◽  
Juan Carlos Herguera
Keyword(s):  
Gulf Of Mexico ◽  
Continental Shelf ◽  
Water Column ◽  
Deep Sea ◽  
Sediment Cores ◽  
Global Fallout ◽  
Tropical Region ◽  
Deep Sea Sediments ◽  
Pu Isotopes ◽  
Upper Slope

Abstract Here we report on new data on plutonium (Pu) isotopes to elucidate activity concentrations, inventories, sources and their transport from the ocean surface to the sea floor from a collection of deep-sea sediment cores (depths ranging from 257 to 3739 m) in the Gulf of Mexico (GoM). Sediment cores collected from the continental shelf and upper slope region of the GoM consistently showed 240Pu/239Pu ratios of 0.15 to 0.26 and Pu-inventories ranging from 15 to 35 Bq m− 2. Inventories and ratios are consistent with global fallout Pu for this tropical region. In the continental shelf and upper slope regions, higher particle concentrations close to the margins favor significant scavenging and removal of Pu from the water column; in contrast with the deep-sea cores that show low 240Pu/239Pu ratios (0.07–0.13) and a much lower Pu inventory (< 7 Bq m-2) implying a small fraction of the expected global fallout inventory has reached into the lower slopes and abyssal plain of the GoM. Low values and a progressive decrease of 240Pu/239Pu ratios and Pu inventories with increasing water depth have been previously reported for the GoM. The low Pu ratios indicate that Nevada tests fallout was an important source of Pu to deep-sea sediments, and that this source was likely more efficiently removed from the water column than global fallout Pu. Analysis of Pu isotopes in two sediment traps from the upper slope regions show 240Pu/239Pu ratios comparable to the ones observed in the global fallout. These results indicate that global fallout Pu is currently the main source of Pu in water column particles. Therefore, a significant fraction of global fallout Pu must still be present; either in a dissolved phase, or as biologically recycled material in the water column, or scavenged on the shelf and shelf break. Our results bring to light important questions on the application of Pu isotopes to establish sediment chronologies, since these radionuclides are shown to be tracers of bioturbation rather than accumulation processes in deep-sea sediments of the GoM, similar to previously reported results from excess 210Pb.

Deep-sea wood-boring bivalves ofXylophaga(Myoida: Pholadidae) on the Continental Shelf: a new species described

2008 ◽  
Vol 88 (7) ◽  
pp. 1459-1464 ◽  
Author(s):  
Janet R. Voight
Keyword(s):  
New Species ◽  
Continental Shelf ◽  
Deep Sea ◽  
Pacific Coast ◽  
Biotic Interactions ◽  
Physiological Constraints ◽  
Intense Competition ◽  
The Pacific ◽  
Wood Boring ◽  
A New Species

Deep-sea organisms are generally considered to be restricted to the great ocean depths, unable to enter shallower habitats except perhaps at the isothermic polar latitudes, due to physiological constraints, or more intense biotic interactions. Wood-boring bivalves ofXylophaga, however, are here shown to be exceptional. A clade, formally recognized by Turner in 2002, united by the derived characters of a complex mesoplax and a truncated excurrent siphon, papillose incurrent siphon with a longitudinal dorsal trough bordered by lappets, and often carrying white or glass-like granules, occurs at significantly shallower and warmer depths than do other species of the genus. Here, description of the new speciesX. multichelafrom 106 m depth off the Pacific coast of Guatemala illustrates the characters that unite the clade. Because wood-boring bivalves face intense competition and high levels of predation at depths of 2200 to 3250 m, they may not perceive biotic interactions at shallower depths to be dramatically more intense. In addition, members of this group are hypothesized to tolerate reduced oxygen availability, a requisite if animals are to occur in warm waters.

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