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https://www.readbyqxmd.com/read/28231343/occurrence-of-mitochondrial-co1-pseudogenes-in-neocalanus-plumchrus-crustacea-copepoda-hybridization-indicated-by-recombined-nuclear-mitochondrial-pseudogenes
#1
Ryuji J Machida, Ya-Ying Lin
A portion of the mitochondrial cytochrome c oxidase I gene was sequenced using both genomic DNA and complement DNA from three planktonic copepod Neocalanus species (N. cristatus, N. plumchrus, and N. flemingeri). Small but critical sequence differences in CO1 were observed between gDNA and cDNA from N. plumchrus. Furthermore, careful observation revealed the presence of recombination between sequences in gDNA from N. plumchrus. Moreover, a chimera of the N. cristatus and N. plumchrus sequences was obtained from N...
2017: PloS One
https://www.readbyqxmd.com/read/28187650/amended-diagnosis-of-the-genus-i-nannodiaptomus-i-copepoda-calanoida-%C3%A2-based-on-redescription-of-i-n-phongnhaensis-i-and-description-of-a-new-species-from-caves-in-central-vietnam
#2
Duc Luong Tran, Anton Brancelj
Nannodiaptomus phongnhaensis Dang & Ho, 2001, an endemic stygobiotic diaptomid from Vietnam and the type species of the genus Nannodiaptomus Dang & Ho, 2001, is redescribed on the basis of a new material from its type locality: Hang Phong Nha Cave, Quang Binh province, central Vietnam. We also designated a neotype, because the type material has been lost. The diagnosis of the genus is amended, based on the description of the neotype. The taxonomic position of the genus in the subfamily Speodiaptominae is proposed, and its relationships with other genera of this subfamily are discussed...
January 19, 2017: Zootaxa
https://www.readbyqxmd.com/read/28187560/revision-of-family-megacalanidae-copepoda-calanoida
#3
Janet M Bradford-Grieve, Leocadio Blanco-Bercial, Geoffrey A Boxshall
The Megacalanidae were revised based on new and archived material. Taxonomic confusion that has existed in the family is discussed and a method is suggested for stabilising names. A detailed examination of the morphology of this family, using the light microscope, has added further useful characters that distinguish genera and species. The added, hitherto undescribed species include character states incompatible with aspects of previous generic definitions (e.g. presence or absence of setae on the maxillule coxal endite)...
February 7, 2017: Zootaxa
https://www.readbyqxmd.com/read/28130672/a-new-species-of-hamaticolax-ho-lin-2006-copepoda-bomolochidae-from-deep-water-macrourids-in-the-mediterranean
#4
David Pérez-I-García, Maite Carrassón, Geoffrey Allan Boxshall
Hamaticolax resupinus n. sp. is described from specimens collected from the gill cavities of Coelorinchus mediterraneus Iwamoto & Ungaro and Coryphaenoides mediterraneus (Giglioli) (Gadiformes: Macrouridae) caught in the Western Mediterranean Sea at depths between 1,236 and 1,626 m. Hamaticolax resupinus n. sp. closely resembles H. maleus Oldewage, 1994, but differs from the latter by its smaller body size and in having a genital double-somite in the female that is markedly wider than the free abdominal somites and has strongly convex lateral margins...
February 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28130671/a-new-species-of-pseudopandarus-kirtisinghe-1950-copepoda-siphonostomatoida-pandaridae-from-sharks-of-the-genus-squalus-l-in-new-caledonian-waters
#5
James P Bernot, Geoffrey A Boxshall
Both sexes of a new species of pandarid copepod are described from sharks of the genus Squalus L. (Squaliformes: Squalidae). Specimens of Pseudopandarus cairae n. sp. were collected from Squalus bucephalus Last, Séret & Pogonoski and S. melanurus Fourmanoir & Rivaton in New Caledonian waters, the first parasitic copepod to be described from either host species. This is the eighth nominal species of Pseudopandarus Kirtisinghe, 1950 and the first to be described from a shark of the order Squaliformes. Pseudopandarus cairae n...
February 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28114412/to-swim-or-not-to-swim-potential-transmission-of-balaenophilus-manatorum-copepoda-harpacticoida-in-marine-turtles
#6
Francesc Domènech, Jesús Tomás, José Luis Crespo-Picazo, Daniel García-Párraga, Juan Antonio Raga, Francisco Javier Aznar
Species of Balaenophilus are the only harpacticoid copepods that exhibit a widespread, obligate association with vertebrates, i.e., B. unisetus with whales and B. manatorum with marine turtles and manatees. In the western Mediterranean, juveniles of the loggerhead sea turtle, Caretta caretta are the only available hosts for B. manatorum, which has been found occurring at high prevalence (>80%) on them. A key question is how these epibionts are transmitted from host to host. We investigated this issue based on experiments with live specimens of B...
2017: PloS One
https://www.readbyqxmd.com/read/28103796/phylogenomic-analysis-of-copepoda-arthropoda-crustacea-reveals-unexpected-similarities-with-earlier-proposed-morphological-phylogenies
#7
Seong-Il Eyun
BACKGROUND: Copepods play a critical role in marine ecosystems but have been poorly investigated in phylogenetic studies. Morphological evidence supports the monophyly of copepods, whereas interordinal relationships continue to be debated. In particular, the phylogenetic position of the order Harpacticoida is still ambiguous and inconsistent among studies. Until now, a small number of molecular studies have been done using only a limited number or even partial genes and thus there is so far no consensus at the order-level...
January 19, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28094568/barcode-based-species-delimitation-in-the-marine-realm-a-test-using-hexanauplia-multicrustacea-thecostraca-and-copepoda
#8
Robert G Young, Cathryn L Abbott, Thomas W Therriault, Sarah J Adamowicz
DNA barcoding has been used successfully for identifying specimens belonging to marine planktonic groups. However, the ability to delineate species within taxonomically diverse and widely distributed marine groups, such as the Copepoda and Thecostraca, remains largely untested. We investigate whether a cytochrome c oxidase subunit I (COI-5P) global pairwise sequence divergence threshold exists between intraspecific and interspecific divergences in the copepods plus the thecostracans (barnacles and allies). Using publicly accessible sequence data, we applied a graphical method to determine an optimal threshold value...
February 2017: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28062993/the-discovery-of-caligus-macrurus-heller-1865-copepoda-caligidae-in-the-mediterranean-sea-and-the-recognition-of-sciaenophilus-van-beneden-1852-as-a-junior-synonym-of-caligus-m%C3%A3-ller-1785
#9
Argun Akif Özak, Alper Yanar, Geoffrey Allan Boxshall
The siphonostomatoid parasitic copepod Caligus macrurus Heller, 1865 is redescribed based on new material collected from the gill filaments and pharynx of tripletail Lobotes surinamensis Bloch (Lobotidae) caught in Iskenderun Bay, Turkey. Key diagnostic characters and newly observed taxonomic features are reported, supported by light and scanning electron microscopy observations. This is the first report of C. macrurus from Mediterranean waters. Caligus macrurus is also recognised as conspecific with the better known Caligus bennetti Causey, 1953, found on the same host, which becomes a junior subjective synonym of C...
January 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28062991/complementary-description-of-ergasilus-arthrosis-roberts-1969-copepoda-poecilostomatoida-ergasilidae-a-new-parasite-of-cichlid-teleosts-in-southeast-mexico
#10
María Isabel Jiménez-García, Eduardo Suárez-Morales
During a parasitological survey of the ichthyofauna of Lake Catemaco, a freshwater system in the Mexican State of Veracruz, the widespread copepod Ergasilus arthrosis Roberts, 1969 was recovered from two cichlid teleosts, Mayaheros urophthalmus (Günther) and Oreochromis sp. This is the first confirmed record of this copepod species outside of the United States and from Mexico; its finding as a parasite of cichlids represents an expansion of the known host range for this copepod. The local prevalence and intensity of infection of E...
January 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28007567/global-phylogeography-of-oithona-similis-s-l-crustacea-copepoda-oithonidae-a-cosmopolitan-plankton-species-or-a-complex-of-cryptic-lineages
#11
Astrid Cornils, Britta Wend-Heckmann, Christoph Held
Traditionally, many small-sized copepod species are considered to be widespread, bipolar or cosmopolitan. However, these large-scale distribution patterns need to be re-examined in view of increasing evidence of cryptic and pseudo-cryptic speciation in pelagic copepods. Here, we present a phylogeographic study of Oithona similis s.l. populations from the Arctic Ocean, the Southern Ocean and its northern boundaries, the North Atlantic and the Mediterrranean Sea. O. similis s.l. is considered as one of the most abundant species in temperate to polar oceans and acts as an important link in the trophic network between the microbial loop and higher trophic levels such as fish larvae...
December 19, 2016: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/27995026/a-simple-and-efficient-total-genomic-dna-extraction-method-for-individual-zooplankton
#12
Hanafiah Fazhan, Khor Waiho, Md Sheriff Shahreza
Molecular approaches are widely applied in species identification and taxonomic studies of minute zooplankton. One of the most focused zooplankton nowadays is from Subclass Copepoda. Accurate species identification of all life stages of the generally small sized copepods through molecular analysis is important, especially in taxonomic and systematic assessment of harpacticoid copepod populations and to understand their dynamics within the marine community. However, total genomic DNA (TGDNA) extraction from individual harpacticoid copepods can be problematic due to their small size and epibenthic behavior...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27988641/copepods-cyclopoida-associated-with-top-shells-vestigastropoda-trochoidea-tegulidae-from-coastal-waters-in-southern-japan-with-descriptions-of-three-new-species
#13
Daisuke Uyeno
Four species of copepods are described based on specimens of both sexes from tegulid top shells (Vestigastropoda) caught from coastal waters of southern Japan. Three species, including two undescribed and one known of the genus Panaietis (Copepoda: Cyclopoida: Anthessiidae) were found in the pharynx and esophagus of gastropods. Panaietis incamerata Stebbing, 1900, P. doraconis n. sp., and P. satsuma n. sp. are distinguished from its congeners by the dorsal plates on the first pedigerous somite, the genital somite, the shape of the spines on legs, the number of setae on legs 1 and 2, and the position and shape of leg 5...
November 27, 2016: Zootaxa
https://www.readbyqxmd.com/read/27965743/the-abundance-and-spatial-distribution-of-soft-sediment-communities-in-tanjung-bungah-malaysia-a-preliminary-study
#14
Nur Aqilah Muhamad Darif, Nur Shakila Abdul Samad, Sazlina Salleh, Mahadi Mohammad, Noor Alia Ahmad Nordin, Aysha Mariam Mohamed Javeed, Michelle Glory G Jonik, Muhamad Hilal Mohd Zainudin
Benthic faunal communities are important components in the intertidal zones. The diversity and abundance of the benthic communities are subjected to different natural and anthropogenic disturbances. The study was conducted as one off sampling on 6th November 2013 (1) to investigate the abundance and distribution of soft sediment communities in relation to environmental variables and (2) investigate the changes of population structure and diversity using spatial scales of 1 m, 10 m, and 100 m. Results indicated a total of 110 individuals of macrobenthos consisting of 7 different groups (Annelida, Bivalvia, Crustacea, Gastropoda, Nematoda, Nemertea, Polychaeta) and 4 different groups of meiobenthos (Copepoda, Nematoda, Ostracoda, Polychaeta) consisting 920 individuals were recorded...
November 2016: Tropical Life Sciences Research
https://www.readbyqxmd.com/read/27965738/zooplankton-composition-and-abundance-as-indicators-of-eutrophication-in-two-small-man-made-lakes
#15
Azma Hanim Ismail, Anis Amalina Mohd Adnan
The distribution and abundance of zooplankton species of Harapan and Aman Lakes were investigated in relation to physical parameters and chlorophyll-a content. Both lakes were characterised by the occurrence of algal bloom problem. The composition of zooplankton was collected at monthly intervals from November 2013 to February 2014. The total number of taxa in Harapan and Aman Lakes were 23 and 27, respectively. Rotifera was the highest abundance group represent 64% of the total species recorded followed by Copepoda (29%) and Cladocera (7%)...
November 2016: Tropical Life Sciences Research
https://www.readbyqxmd.com/read/27925015/trends-in-freshwater-microcrustaceans-studies-in-brazil-between-1990-and-2014
#16
W M Silva, G Perbiche-Neves
This study presents a review of scientiometric data about freshwater microcrustaceans (Copepoda, Ostracoda, Branchiopoda: Cladocera, Anostraca, Notostraca and Conchostraca) in Brazil from 1990-2014. This review is based on 179 papers published across four databases, using the following keywords in the search: microcrustaceans, Copepoda, Cyclopoida, Calanoida, Harpacticoida, Ergasilidae, Daphniidae, Moinidae, Cladocera, Ostracoda, Conchostraca, zooplankton, reservoir, river, ponds, reservoirs, wetlands, caves, lakes, limnology, ecology, aquatic, taxonomy, systematics, morphology and biogeography...
December 1, 2016: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/27913071/determination-and-validation-of-an-aquatic-maximum-acceptable-concentration-environmental-quality-standard-mac-eqs-value-for-the-agricultural-fungicide-azoxystrobin
#17
Elsa Teresa Rodrigues, Miguel Ângelo Pardal, Cristiano Gante, João Loureiro, Isabel Lopes
The main goal of the present study was to determine and validate an aquatic Maximum Acceptable Concentration-Environmental Quality Standard (MAC-EQS) value for the agricultural fungicide azoxystrobin (AZX). Assessment factors were applied to short-term toxicity data using the lowest EC50 and after the Species Sensitivity Distribution (SSD) method. Both ways of EQS generation were applied to a freshwater toxicity dataset for AZX based on available data, and to marine toxicity datasets for AZX and Ortiva(®) (a commercial formulation of AZX) obtained by the present study...
February 2017: Environmental Pollution
https://www.readbyqxmd.com/read/27857452/embryonic-development-and-a-quantitative-model-of-programmed-dna-elimination-in-mesocyclops-edax-s-a-forbes-1891-copepoda-cyclopoida
#18
Michelle K Clower, Ashton S Holub, Rebecca T Smith, Grace A Wyngaard
The highly programmed fragmentation of chromosomes and elimination of large amounts of nuclear DNA from the presomatic cell lineages (i.e., chromatin diminution), occurs in the embryos of the freshwater zooplankton Mesocyclops edax (S. A. Forbes, 1891) (Crustacea: Copepoda). The somatic genome is reorganized and reduced to a size five times smaller even though the germline genome remains intact. We present the first comprehensive, quantitative model of DNA content throughout embryogenesis in a copepod that possesses embryonic DNA elimination...
2016: Journal of Crustacean Biology
https://www.readbyqxmd.com/read/27811810/on-the-occurrence-of-caligids-copepoda-siphonostomatoida-in-the-marine-plankton-a-review-and-checklist
#19
Balu Alagar Venmathi Maran, Eduardo Suárez-Morales, Susumu Ohtsuka, Ho Young Soh, Ui Wook Hwang
Members of the copepod genus Caligus Müller, 1785 (Siphonostomatoida: Caligidae) are commonly referred to as sea lice. Virtually all of the more than 450 species utilize marine fishes as hosts, however, an increasing number of records from marine plankton samples shows that at least some species reside in the water column during their adult phase. Members of three different genera, Caligus, Lepeophtheirus von Nordmann, 1832, and Metacaligus Thomsen, 1949 have been reported from plankton samples off eastern Asia and in the north-western Atlantic...
October 11, 2016: Zootaxa
https://www.readbyqxmd.com/read/27811809/a-new-species-of-caligus-m%C3%A3-ller-1785-copepoda-siphonostomatoida-caligidae-from-coral-reef-plankton-in-the-mexican-caribbean
#20
Eduardo Suárez-Morales, Rebeca Gasca
During a survey of the zooplankton community of a protected reef system on the southern coast of the Mexican Caribbean, many female and male specimens of an undescribed species of Caligus Müller, 1785 were collected. The new species closely resembles C. wilsoni Delamare Deboutteville & Nunez-Ruivo, 1958 and C. belones (Krøyer, 1863) and has affinities with C. balistae Steenstrup & Lütken, 1861 and C. longipedis Bassett-Smith, 1898, all known from the Caribbean Sea and adjacent waters of the north-western Atlantic Ocean...
October 11, 2016: Zootaxa
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