scholarly journals Mitogenomic phylogenetic analyses of Leptogorgia virgulata and Leptogorgia hebes (Anthozoa: Octocorallia) from the Gulf of Mexico provides insight on Gorgoniidae divergence between Pacific and Atlantic lineages

2019 ◽  
Vol 9 (24) ◽  
pp. 14114-14129
Author(s):  
Samantha Silvestri ◽  
Diego F. Figueroa ◽  
David Hicks ◽  
Nicole J. Figueroa
Keyword(s):  
Gulf Of Mexico ◽  
Phylogenetic Analyses ◽  
Leptogorgia Virgulata

scholarly journals Characterization of Microbial Community Structure in Gulf of Mexico Gas Hydrates: Comparative Analysis of DNA- and RNA-Derived Clone Libraries

2005 ◽  
Vol 71 (6) ◽  
pp. 3235-3247 ◽  
Author(s):  
Heath J. Mills ◽  
Robert J. Martinez ◽  
Sandra Story ◽  
Patricia A. Sobecky
Keyword(s):  
Phylogenetic Analysis ◽  
Microbial Community ◽  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Phylogenetic Analyses ◽  
Active Fraction ◽  
Clone Libraries ◽  
Dna And Rna ◽  
Rna And Dna

ABSTRACT The characterization of microbial assemblages within solid gas hydrate, especially those that may be physiologically active under in situ hydrate conditions, is essential to gain a better understanding of the effects and contributions of microbial activities in Gulf of Mexico (GoM) hydrate ecosystems. In this study, the composition of the Bacteria and Archaea communities was determined by 16S rRNA phylogenetic analyses of clone libraries derived from RNA and DNA extracted from sediment-entrained hydrate (SEH) and interior hydrate (IH). The hydrate was recovered from an exposed mound located in the northern GoM continental slope with a hydrate chipper designed for use on the manned-submersible Johnson Sea Link (water depth, 550 m). Previous geochemical analyses indicated that there was increased metabolic activity in the SEH compared to the IH layer (B. N. Orcutt, A. Boetius, S. K. Lugo, I. R. Macdonald, V. A. Samarkin, and S. Joye, Chem. Geol. 205:239-251). Phylogenetic analysis of RNA- and DNA-derived clones indicated that there was greater diversity in the SEH libraries than in the IH libraries. A majority of the clones obtained from the metabolically active fraction of the microbial community were most closely related to putative sulfate-reducing bacteria and anaerobic methane-oxidizing archaea. Several novel bacterial and archaeal phylotypes for which there were no previously identified closely related cultured isolates were detected in the RNA- and DNA-derived clone libraries. This study was the first phylogenetic analysis of the metabolically active fraction of the microbial community extant in the distinct SEH and IH layers of GoM gas hydrate.

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 Multigene phylogeny of the scyphozoan jellyfish family Pelagiidae reveals that the common U.S. Atlantic sea nettle comprises two distinct species (Chrysaora quinquecirrhaandC. chesapeakei)

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3863 ◽  
Author(s):  
Keith M. Bayha ◽  
Allen G. Collins ◽  
Patrick M. Gaffney
Keyword(s):  
Gulf Of Mexico ◽  
Sequence Data ◽  
Phylogenetic Analyses ◽  
Source Region ◽  
Historical Review ◽  
Distinct Species ◽  
Chrysaora Quinquecirrha ◽  
Western Africa ◽  
Sea Nettle ◽  
The U.S

BackgroundSpecies of the scyphozoan family Pelagiidae (e.g.,Pelagia noctiluca,Chrysaora quinquecirrha) are well-known for impacting fisheries, aquaculture, and tourism, especially for the painful sting they can inflict on swimmers. However, historical taxonomic uncertainty at the genus (e.g., new genusMawia) and species levels hinders progress in studying their biology and evolutionary adaptations that make them nuisance species, as well as ability to understand and/or mitigate their ecological and economic impacts.MethodsWe collected nuclear (28SrDNA) and mitochondrial (cytochromecoxidase I and16SrDNA) sequence data from individuals of all four pelagiid genera, including 11 of 13 currently recognized species ofChrysaora. To examine species boundaries in the U.S. Atlantic sea nettleChrysaora quinquecirrha, specimens were included from its entire range along the U.S. Atlantic and Gulf of Mexico coasts, with representatives also examined morphologically (macromorphology and cnidome).ResultsPhylogenetic analyses show that the genusChrysaorais paraphyletic with respect to other pelagiid genera. In combined analyses,Mawia, sampled from the coast of Senegal, is most closely related toSanderia malayensis, andPelagiaforms a close relationship to a clade of PacificChrysaoraspecies (Chrysaora achlyos, Chrysaora colorata,Chrysaora fuscescens, andChrysaora melanaster).Chrysaora quinquecirrhais polyphyletic, with one clade from the U.S. coastal Atlantic and another in U.S. Atlantic estuaries and Gulf of Mexico. These genetic differences are reflected in morphology, e.g., tentacle and lappet number, oral arm length, and nematocyst dimensions. Caribbean sea nettles (Jamaica and Panama) are genetically similar to the U.S. Atlantic estuaries and Gulf of Mexico clade ofChrysaora quinquecirrha.DiscussionOur phylogenetic hypothesis for Pelagiidae contradicts current generic definitions, revealing major disagreements between DNA-based and morphology-based phylogenies. A paraphyleticChrysaoraraises systematic questions at the genus level for Pelagiidae; accepting the validity of the recently erected genusMawia, as well as past genera, will require the creation of additional pelagiid genera. Historical review of the species-delineating genetic and morphological differences indicates thatChrysaora quinquecirrhaDesor 1848 applies to the U.S. Coastal AtlanticChrysaoraspecies (U.S. Atlantic sea nettle), while the nameC. chesapeakeiPapenfuss 1936 applies to the U.S. Atlantic estuarine and Gulf of Mexico Chrysaora species (Atlantic bay nettle). We provide a detailed redescription, with designation of a neotype forChrysaora chesapeakei, and clarify the description ofChrysaora quinquecirrha. Since CaribbeanChrysaoraare genetically similar toChrysaora chesapeakei, we provisionally term themChrysaorac.f.chesapeakei. The presence ofMawia benovicioff the coast of Western Africa provides a potential source region for jellyfish introduced into the Adriatic Sea in 2013.

scholarly journals Molecular and Morphological Diversity of Lithothamnion spp. (Hapalidiales, Rhodophyta) from Deepwater Rhodolith Beds in the Northwestern Gulf of Mexico

Phytotaxa ◽  
2016 ◽  
Vol 278 (2) ◽  
pp. 81 ◽  
Author(s):  
JOSEPH L. RICHARDS ◽  
TALITA VIEIRA-PINTO ◽  
WILLIAM E. SCHMIDT ◽  
THOMAS SAUVAGE ◽  
PAUL W. GABRIELSON ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Species Delimitation ◽  
Phylogenetic Analyses ◽  
Morphological Diversity ◽  
Coralline Algae ◽  
Type Specimens ◽  
Sem Images ◽  
Generic Concept ◽  
Diverse Community ◽  
Scanning Electron

In the Northwestern Gulf of Mexico (NWGMx), subtidal rhodolith beds offshore Louisiana at 45–80 m depth harbor a diverse community of uncharacterized non-geniculate coralline algae including both biogenic and autogenic rhodoliths and other encrusting taxa. Identifying specimens to their correct genus and species is an ongoing process because many available names remain to be validated by comparison to type specimens. Here, comparative DNA sequencing (psbA, UPA, and COI) and scanning electron microscopy (SEM) are used to assess the molecular and morphological diversity of the rhodolith-forming specimens belonging to the generic concept of Lithothamnion. Phylogenetic and species delimitation analyses of the newly generated sequences from recently dredged specimens at Ewing and Sackett Banks offshore Louisiana reveal the presence of at least six species of Lithothamnion, whose generic placement is confirmed by SEM images of features considered characteristic for the genus. More broadly, our analyses indicate at least eight Lithothamnion species are found in the Gulf of Mexico. Phylogenetic analyses of single (psbA and COI) and concatenated markers (psbA, COI and UPA) show that Lithothamnion is polyphyletic.

scholarly journals Three new symbiotic crabs of the genus Glassella Campos & Wicksten, 1997 from Atlantic and Gulf of Mexico coasts of Florida, USA (Decapoda: Brachyura: Pinnotheridae)

2020 ◽  
Vol 40 (6) ◽  
pp. 899-917
Author(s):  
Darryl L Felder ◽  
Emma Palacios Theil
Keyword(s):  
New Species ◽  
Gulf Of Mexico ◽  
Dna Sequencing ◽  
Genomic Dna ◽  
Phylogenetic Analyses ◽  
Western Atlantic ◽  
The Third ◽  
Separate Genus ◽  
Molecular Phylogenetic ◽  
Three New Species

Abstract New species of the pinnotherid crab genus GlassellaCampos & Wicksten, 1997 are described from western Atlantic waters along the east and west coasts of Florida, with the generic assignment of one being provisional. Glassella chaneyin. sp., Glassella martinin. sp., and Glassella taylorin. sp., all morphologically resemble the long-known species G. floridana (Rathbun, 1918) and overlap part of its distributional range, there occupying similar habitats and at least sometimes found with similar hosts. While genomic DNA sequencing has previously established the generic assignment of G. floridana, small sizes and suboptimal preservation histories of specimens representing the three new species have rendered all sequencing attempts unsuccessful, and thus not allowed their inclusion in molecular phylogenetic analyses. To facilitate present morphological comparisons, a rediagnosis of G. floridana was undertaken, and previously published illustrations were augmented, the latter now including figures of its previously undescribed male first gonopod and gonopodal plate. Comparisons of G. floridana to the three new species reveal striking diagnostic differences between all four species in their male first gonopods and varied configurations in the gonopodal plate or its probable homologs. These characters support the otherwise established separation of G. floridana from its congeners on the basis of its more strongly armed flexor margins of the fourth and fifth pereopods. In G. taylorin. sp., representing the smallest known member of Glassella, development of the third maxilliped and male first gonopod is so exceptional as to suggest the species may warrant eventual assignment to a separate genus.

scholarly journals A new crab of the genus Nanoplax from the Gulf of Mexico, and assignment of Micropanope pusilla to a new genus (Crustacea, Brachyura, Pseudorhombilidae)

Zootaxa ◽  
2020 ◽  
Vol 4810 (3) ◽  
pp. 531-545
Author(s):  
DARRYL L. FELDER
Keyword(s):  
Gulf Of Mexico ◽  
Morphological Study ◽  
New Genus ◽  
Phylogenetic Analyses ◽  
Mature Male ◽  
Type Series ◽  
Molecular Phylogenetic ◽  
Sequence Quality

Nanoplax thomai n. sp. is described from the Gulf of Mexico, representing the second species of the genus. The description is based upon a number of specimens previously misidentified as Micropanope truncatifrons Rathbun, 1898, including one so represented in recent molecular phylogenetic analyses. As restricted, Micropanope truncatifrons remains known with certainty from only the limited type series, which does not include a mature male, and sequence quality tissues are not available for molecular phylogenetic analyses. Its generic placement remains questionable following morphological study of its type materials and comparisons to specimens representing other present and former members of Micropanope Stimpson, 1871. Those comparisons underscore that morphological and molecular distinctions warrant assignment of Micropanope pusilla A. Milne-Edwards, 1880 to a new genus, herein designated as Pseudopanopeus n. gen. 

Author response for "Microtexture and U–Pb geochronology of detrital zircon grains in the Chachalacas beach, Veracruz State, Gulf of Mexico"

2020 ◽  
Author(s):  
John S. Armstrong‐Altrin ◽  
Mayla A. Ramos‐Vázquez ◽  
Nadia Y. Hermenegildo‐Ruiz ◽  
Jayagopal Madhavaraju
Keyword(s):  
Gulf Of Mexico ◽  
Detrital Zircon ◽  
Author Response

Ellipsomyxa ariusi sp. nov. (Myxosporea: Ceratomyxidae), a new myxosporean infecting the gallbladder of threadfin sea catfish Arius arius in India

2020 ◽  
Vol 142 ◽  
pp. 83-97
Author(s):  
A Chandran ◽  
PU Zacharia ◽  
TV Sathianandan ◽  
NK Sanil
Keyword(s):  
Phylogenetic Analyses ◽  
Type Specimen ◽  
Ssu Rdna ◽  
Fish Host ◽  
Present Species ◽  
Epithelial Layer ◽  
Histopathological Changes ◽  
Mucus Production ◽  
High Bootstrap ◽  
A New Species

The present study describes a new species of myxosporean, Ellipsomyxa ariusi sp. nov., infecting the gallbladder of the threadfin sea catfish Arius arius (Hamilton, 1822). E. ariusi sp. nov. is characterized by bivalvular, ellipsoid or elongate-oval myxospores with smooth spore valves and a straight suture, arranged at an angle to the longitudinal spore axis. Mature myxospores measured 10.1 ± 0.8 µm in length, 6.8 ± 0.5 µm in width and 7.7 ± 0.7 µm in thickness. Polar capsules are equal in size and oval to pyriform in shape. They are positioned at an angle to the longitudinal myxospore axis and open in opposite directions. Polar capsules measured 2.8 ± 0.3 µm in length and 2.5 ± 0.4 µm in width; polar filaments formed 4-5 coils, and extended to 32.2 ± 2.1 µm in length. Monosporic and disporic plasmodial stages attached to the wall of gallbladder. Molecular analysis of the type specimen generated a 1703 bp partial SSU rDNA sequence (MN892546), which was identical to the isolates from 3 other locations. In phylogenetic analyses, genus Ellipsomyxa appeared monophyletic and E. ariusi sp. nov. occupied an independent position in maximum likelihood and Bayesian inference trees with high bootstrap values. The overall prevalence of infection was 54.8% and multiway ANOVA revealed that it varied significantly with location, year, season, sex and size of the fish host. Histopathological changes associated with E. ariusi sp. nov. infection included swelling, vacuolation and detachment of epithelial layer, reduced mucus production and altered consistency and colour of bile. Based on the morphologic, morphometric and molecular differences with known species of Ellipsomyxa, and considering differences in host and geographic locations, the present species is treated as new and the name Ellipsomyxa ariusi sp. nov. is proposed.

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