A New Genus and Two New Species of Peltogastridae (Crustacea: Cirripedia: Rhizocephala) Parasitizing Hermit Crabs from Okinawa Island (Ryukyu Archipelago, Japan), and their DNA-barcodes

Yoshida, Ryuta; Osawa, Masayuki; Hirose, Mamiko; Hirose, Euichi

doi:10.2108/zsj.28.853

Cited by 25 publications

(16 citation statements)

References 23 publications

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“…There is no phylogenetic support for this split or geographic segregation between specimens from the East Pacific Rise and southern East Pacific Rise, thus suggesting that the division of Neolepas zevinae/rapanuii is not indicative of species-level differentiation. A barcoding gap within and among species has been consistently found in other barnacle taxa (Tsang et al 2008(Tsang et al , 2009Yoshida et al 2011) and in crustaceans in general (Costa et al 2007;Matzen da Silva et al 2011); thus, our coxI genetic distance data provide further support to the species delimitations proposed for Clade A. The species delimitation framework developed in this study will enable rapid species assignments as specimens from newly-explored geographical regions become available.…”

Section: Species Delimitation and Relationshipssupporting

confidence: 72%

Evolutionary and biogeographical patterns of barnacles from deep‐sea hydrothermal vents

2015

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The characterization of evolutionary and biogeographical patterns is of fundamental importance to identify factors driving biodiversity. Due to their widespread but discontinuous distribution, deep‐sea hydrothermal vent barnacles represent an excellent model for testing biogeographical hypotheses regarding the origin, dispersal and diversity of modern vent fauna. Here, we characterize the global genetic diversity of vent barnacles to infer their time of radiation, place of origin, mode of dispersal and diversification. Our approach was to target a suite of multiple loci in samples representing seven of the eight described genera. We also performed restriction‐site associated DNA sequencing on individuals from each species. Phylogenetic inferences and topology hypothesis tests indicate that vent barnacles have colonized deep‐sea hydrothermal vents at least twice in history. Consistent with preliminary estimates, we find a likely radiation of barnacles in vent ecosystems during the Cenozoic. Our analyses suggest that the western Pacific was the place of origin of the major vent barnacle lineage, followed by circumglobal colonization eastwards through the Southern Hemisphere during the Neogene. The inferred time of radiation rejects the classic hypotheses of antiquity of vent taxa. The timing and the mode of origin, radiation and dispersal are consistent with recent inferences made for other deep‐sea taxa, including nonvent species, and are correlated with the occurrence of major geological events and mass extinctions. Thus, we suggest that the geological processes and dispersal mechanisms discussed here can explain the current distribution patterns of many other marine taxa and have played an important role shaping deep‐sea faunal diversity. These results also constitute the critical baseline data with which to assess potential effects of anthropogenic disturbances on deep‐sea ecosystems.

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Section: Species Delimitation and Relationshipssupporting

confidence: 72%

Evolutionary and biogeographical patterns of barnacles from deep‐sea hydrothermal vents

2015

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“…in the present study, the parasite has a broad host range and has been documented from hermit crabs in four genera (Clibanarius, Diogenes, Pagurodofleinia, Pagurus;An et al 2011). In addition to the parasitic isopod, a rhizocephalan barnacle was found on ∼1.5% of the Pagurus angustus collected; further morphological and molecular work will have to be completed to identify this parasite to species (see Yoshida et al 2011Yoshida et al , 2012 for recent work on the taxonomy of rhizocephalans from hermit crabs in Asia). Live observations on the behaviour of bopyrid isopods have rarely been reported, particularly in reference to reproduction (Tucker 1930;Reinhard 1949;Beck 1980b;Cash & Bauer 1993); however, Cash & Bauer (1993) documented aspects of the reproduction and behaviour of a branchial bopyrid in relation to host ecdysis.…”

Section: Discussionmentioning

confidence: 82%

Prevalence, reproduction and morphology of the parasitic isopodAthelges takanoshimensisIshii, 1914 (Isopoda: Bopyridae) from Hong Kong hermit crabs

Cericola

Williams

2014

Marine Biology Research

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The bopyrid isopod Athelges takanoshimensis is a relatively common abdominal parasite of hermit crabs from Asia. This study investigated the prevalence, reproduction, and morphology of A. takanoshimensis from over 1560 hermit crab specimens collected in Hong Kong between 2000 and 2004. Among these collections, A. takanoshimensis was on ∼7% of the hermit crab Pagurus angustus and was also recorded from 5% of Pagurus hedleyi; no hermit crabs from the genus Clibanarius were infested. The male-female ratio of parasitized P. angustus was approximately 3:7, in contrast to a 3:2 ratio for uninfested hosts, suggesting that parasitism has an influence on host sex ratio. Athelges takanoshimensis produced up to 5031 embryos (average brood size = 2852). Estimates of body size (head length, pereon length, and total length) were analysed as predictors of fecundity but a significant correlation was only found between brood size and pereon length. The morphology of the life history stages of A. takanoshimensis is described using scanning electron microscopy (SEM), including the first investigation of epicaridium larvae for this species. Notes on the behaviour of ovigerous females and the release of their larvae are provided, thus providing a better understanding of the natural history and morphology of A. takanoshimensis.

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“…hippolytes has been reported to parasitize 26 species of caridean shrimp [36, 57, 87], however the species might be a complex of cryptic species with higher host specificity. Representatives of Peltogaster have been reported to parasitize hermit crabs (Paguridae, Diogenidae) [88, 89]. In comparison to other parasitic castrators, rhizocephalans show a broader host range [90].…”

Section: Discussionmentioning

confidence: 99%

The bigger, the better? Volume measurements of parasites and hosts: Parasitic barnacles (Cirripedia, Rhizocephala) and their decapod hosts

et al. 2017

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Rhizocephala, a group of parasitic castrators of other crustaceans, shows remarkable morphological adaptations to their lifestyle. The adult female parasite consists of a body that can be differentiated into two distinct regions: a sac-like structure containing the reproductive organs (the externa), and a trophic, root like system situated inside the hosts body (the interna). Parasitism results in the castration of their hosts, achieved by absorbing the entire reproductive energy of the host. Thus, the ratio of the host and parasite sizes is crucial for the understanding of the parasite’s energetic cost. Using advanced imaging methods (micro-CT in conjunction with 3D modeling), we measured the volume of parasitic structures (externa, interna, egg mass, egg number, visceral mass) and the volume of the entire host. Our results show positive correlations between the volume of (1) entire rhizocephalan (externa + interna) and host body, (2) rhizocephalan externa and host body, (3) rhizocephalan visceral mass and rhizocephalan body, (4) egg mass and rhizocephalan externa, (5) rhizocephalan egg mass and their egg number. Comparing the rhizocephalan Sylon hippolytes, a parasite of caridean shrimps, and representatives of Peltogaster, parasites of hermit crabs, we could match their different traits on a reconstructed relationship. With this study we add new and significant information to our global understanding of the evolution of parasitic castrators, of interactions between a parasitic castrator and its host and of different parasitic strategies within parasitic castrators exemplified by rhizocephalans.

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A New Genus and Two New Species of Peltogastridae (Crustacea: Cirripedia: Rhizocephala) Parasitizing Hermit Crabs from Okinawa Island (Ryukyu Archipelago, Japan), and their DNA-barcodes

Cited by 25 publications

References 23 publications

Evolutionary and biogeographical patterns of barnacles from deep‐sea hydrothermal vents

Evolutionary and biogeographical patterns of barnacles from deep‐sea hydrothermal vents

Prevalence, reproduction and morphology of the parasitic isopodAthelges takanoshimensisIshii, 1914 (Isopoda: Bopyridae) from Hong Kong hermit crabs

The bigger, the better? Volume measurements of parasites and hosts: Parasitic barnacles (Cirripedia, Rhizocephala) and their decapod hosts

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