Integrative taxonomy of Pseudolepeophtheirus longicauda (Crustacea: Copepoda: Caligidae) parasitic on Platichthys stellatus (Actinopterygii: Pleuronectidae)

Homma, Riko; Uyeno, Daisuke; Kakui, Keiichi

doi:10.1016/j.parint.2020.102135

Cited by 4 publications

(2 citation statements)

References 39 publications

(51 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among four typhlotanaid species with sufficiently long (greater than 1600 bp) 18S sequences available in public databases, Typhlotanais finmarchicus Sars, 1882 (accession number MN337129), Typhlotanais variabilis Hansen, 1913 (MK804186), and Typhlotanais trispinosus Hansen, 1913 (MK804184) were not included in our dataset because they contained long gaps not present in the other sequences, as shown by a preliminary alignment. Sequences were aligned (3475 positions in the aligned 18S dataset) and the optimal substitution model (GTR + G + I) was selected in the manner described by Homma et al (2020). A maximum likelihood (ML) analysis was conducted in RAxML v8.2.10 (Stamatakis, 2014), with nodal support values obtained by analysis of 1000 bootstrap pseudoreplicates.…”

Section: Methodsmentioning

confidence: 99%

Description of a New Hamatipeda Species, with an 18S Molecular Phylogeny (Crustacea: Tanaidacea: Typhlotanaidae)

Kakui

Hiruta

2021

Zoological Science

Self Cite

View full text Add to dashboard Cite

We describe a new typhlotanaid species, Hamatipeda kohtsukai sp. nov., collected from between 167 and 488 m depth in the Sagami Sea, Japan. This is the first record of Hamatipeda from the northern hemisphere. Hamatipeda kohtsukai resembles Hamatipeda trapezoida from the Subantarctic region in having pereonites 1-3 widest anteriorly (not rectangular), but differs from it in the length ratio of antennal articles 4/5; the number of setae on the dactyli of pereopods 1-3, ischia of pereopods 4-6, and carpi of pereopods 4-6; the shape of the unguis of pereopods 4-6; and the shape of the uropodal endopod. We determined partial sequences for the cytochrome c oxidase subunit I (COI; cox1) and 18S rRNA (18S) genes in H. kohtsukai. A phylogenetic reconstruction based on the 18S sequences recovered a highly supported Typhlotanaidae clade containing H. kohtsukai and Typhlotanais mixtus, with Paranarthrura sp. (Agathotanaidae) as the sister taxon. A key to species of Hamatipeda is presented.

show abstract

Section: Methodsmentioning

confidence: 99%

Description of a New Hamatipeda Species, with an 18S Molecular Phylogeny (Crustacea: Tanaidacea: Typhlotanaidae)

Kakui

Hiruta

2021

Zoological Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…Whole specimen collection is thus often inevitable. For example, dissection of specific body parts or internal structures may be necessary for correct identification (Araujo et al., 2020; Christophoryová et al., 2023; Homma et al., 2020; Kergoat et al., 2015), sufficient DNA yield requires whole body extraction in small organisms or a reference voucher is needed (Català et al., 2021; Johnson et al., 2018). In case of unavoidable whole specimen sampling, the necessity to prevent the overexploitation of the species' natural populations may thus further restrict the number of collected individuals (Hedin, 2015; Jacobs et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

Species delimitation with limited sampling: An example from rare trapdoor spider genus Cyclocosmia (Mygalomorphae, Halonoproctidae)

Opatova,

Bourguignon,

Bond

2023

Molecular Ecology Resources

View full text Add to dashboard Cite

The outcome of species delimitation depends on many factors, including conceptual framework, study design, data availability, methodology employed and subjective decision making. Obtaining sufficient taxon sampling in endangered or rare taxa might be difficult, particularly when non‐lethal tissue collection cannot be utilized. The need to avoid overexploitation of the natural populations may thus limit methodological framework available for downstream data analyses and bias the results. We test species boundaries in rare North American trapdoor spider genus Cyclocosmia Ausserer (1871) inhabiting the Southern Coastal Plain biodiversity hotspot with the use of genomic data and two multispecies coalescent model methods. We evaluate the performance of each methodology within a limited sampling framework. To mitigate the risk of species over splitting, common in taxa with highly structured populations, we subsequently implement a species validation step via genealogical diversification index (gdi), which accounts for both genetic isolation and gene flow. We delimited eight geographically restricted lineages within sampled North American Cyclocosmia, suggesting that major river drainages in the region are likely barriers to dispersal. Our results suggest that utilizing BPP in the species discovery step might be a good option for datasets comprising hundreds of loci, but fewer individuals, which may be a common scenario for rare taxa. However, we also show that such results should be validated via gdi, in order to avoid over splitting.

show abstract

First report of marine horsehair worms (Nematomorpha: Nectonema) parasitic in isopod crustaceans

2021

Self Cite

View full text Add to dashboard Cite

Nectonema, the only horsehair worm (Nematomorpha) genus found in marine environments, was previously known to be parasitic only in decapod crustaceans. We report Nectonema sp.as the first record of a marine nematomorph parasitic in isopod crustaceans. This is also the third record of marine nematomorphs from the North Pacific. Six infected isopods (Natatolana japonensis) collected from 1425 m depth in the Sea of Japan each contained one to seven (mean 2.33) nematomorphs in the body cavity in the pereon. There was no correlation between the host body length and number of parasites. For Nectonema sp., we describe and illustrate morphological features of the parasitic juvenile stage and present nucleotide sequences for the cytochrome c oxidase subunit I gene (COI or cox1; 451 nt), 18S rRNA gene (1777 nt), and region spanning the internal transcribed spacer 1 (ITS1) and the 28S rRNA gene including the 5.8S rRNA gene and ITS2 (1218 nt in total). In an 18S maximum-likelihood tree that included 24 nematomorph species, Nectonema sp. grouped with N. agile from the northwestern Atlantic; the 18S gene from these two taxa was divergent by 11.8% K2P distance, suggesting they are different species. Nectonema species may have a broader range of host groups than previously suspected, but may have been previously misidentified as nematode parasites.

show abstract

Integrative taxonomy of Pseudolepeophtheirus longicauda (Crustacea: Copepoda: Caligidae) parasitic on Platichthys stellatus (Actinopterygii: Pleuronectidae)

Cited by 4 publications

References 39 publications

Description of a New Hamatipeda Species, with an 18S Molecular Phylogeny (Crustacea: Tanaidacea: Typhlotanaidae)

Description of a New Hamatipeda Species, with an 18S Molecular Phylogeny (Crustacea: Tanaidacea: Typhlotanaidae)

Species delimitation with limited sampling: An example from rare trapdoor spider genus Cyclocosmia (Mygalomorphae, Halonoproctidae)

First report of marine horsehair worms (Nematomorpha: Nectonema) parasitic in isopod crustaceans

Contact Info

Product

Resources

About