Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand

Hosie, Andrew M.

doi:10.11646/zootaxa.1795.1.1

Cited by 14 publications

(25 citation statements)

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“…In contrast, females of Hemioniscidae retain their anterior segmentation (Figure 3Q) via incomplete biphasic molting [31]. Male cryptoniscoids (Figure 3N, R) are morphologically indistinguishable from the cryptoniscus larval form [21].…”

Section: Resultsmentioning

confidence: 99%

The Global Diversity of Parasitic Isopods Associated with Crustacean Hosts (Isopoda: Bopyroidea and Cryptoniscoidea)

2012

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Parasitic isopods of Bopyroidea and Cryptoniscoidea (commonly referred to as epicarideans) are unique in using crustaceans as both intermediate and definitive hosts. In total, 795 epicarideans are known, representing ∼7.7% of described isopods. The rate of description of parasitic species has not matched that of free-living isopods and this disparity will likely continue due to the more cryptic nature of these parasites. Distribution patterns of epicarideans are influenced by a combination of their definitive (both benthic and pelagic species) and intermediate (pelagic copepod) host distributions, although host specificity is poorly known for most species. Among epicarideans, nearly all species in Bopyroidea are ectoparasitic on decapod hosts. Bopyrids are the most diverse taxon (605 species), with their highest diversity in the North West Pacific (139 species), East Asian Sea (120 species), and Central Indian Ocean (44 species). The diversity patterns of Cryptoniscoidea (99 species, endoparasites of a diverse assemblage of crustacean hosts) are distinct from bopyrids, with the greatest diversity of cryptoniscoids in the North East Atlantic (18 species) followed by the Antarctic, Mediterranean, and Arctic regions (13, 12, and 8 species, respectively). Dajidae (54 species, ectoparasites of shrimp, mysids, and euphausids) exhibits highest diversity in the Antarctic (7 species) with 14 species in the Arctic and North East Atlantic regions combined. Entoniscidae (37 species, endoparasites within anomuran, brachyuran and shrimp hosts) show highest diversity in the North West Pacific (10 species) and North East Atlantic (8 species). Most epicarideans are known from relatively shallow waters, although some bopyrids are known from depths below 4000 m. Lack of parasitic groups in certain geographic areas is likely a sampling artifact and we predict that the Central Indian Ocean and East Asian Sea (in particular, the Indo-Malay-Philippines Archipelago) hold a wealth of undescribed species, reflecting our knowledge of host diversity patterns.

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Section: Resultsmentioning

confidence: 99%

The Global Diversity of Parasitic Isopods Associated with Crustacean Hosts (Isopoda: Bopyroidea and Cryptoniscoidea)

2012

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“…However, the exact ontogenetic phase of the fossils cannot be determined with certainty. In some epicaridean lineages (Cryptoniscoidea) the adult male does (at least superficially) not differ morphologically from the cryptoniscium (Hosie, 2008). Therefore, the studied fossils could not only represent cryptoniscium larvae but also adult males with a paedomorphic morphology.…”

Section: Systematic Interpretationmentioning

confidence: 96%

“…When a female dies on the alive host, adult males can also transform into functional females (Reverberi, 1947). Hosie (2008) stated that in the epicaridean subgroup Cryptoniscoidea males are often not distinguishable from cryptoniscia. The author uses the term 'male' for all non-planktic cryptoniscoideans that show no signs of modification towards a female habitus.…”

Section: The Post-embryonic Ontogeny Of Epicarideansmentioning

confidence: 99%

Exceptionally preserved cryptoniscium larvae - morphological details of rare isopod crustaceans from French Cretaceous Vendean amber

Schädel

Perrichot²,

Haug

2019

Palaeontol Electron

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“…Males are immediately recognizable as isopods, albeit they exhibit neoteny, and resemble cryptoniscium larvae. In fact, the cryptoniscium larvae, functional males, and immature females are all indistinguishable with light microscopy (Hosie, 2008). The current taxonomic framework at the family level is unresolved and based largely on host choice rather than on morphological or molecular data.…”

Section: Introductionmentioning

confidence: 99%

A molecular phylogeny of Bopyroidea and Cryptoniscoidea (Crustacea: Isopoda)

Boyko

Moss

Williams

et al. 2013

Systematics and Biodiversity

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Epicaridean isopods are parasitic on other crustaceans. They represent a diverse group of highly derived taxa in two superfamilies and 10 families. Little work has been done on the phylogeny of these parasites because of the difficulty in defining homologous characters for adults above the genus level. The females exhibit morphological reduction of characters and the males have few distinguishing characters. Moreover, epicarideans have only rarely been included in past studies of isopod phylogeny. Our objective was to derive a phylogeny of epicaridean taxa based on 18S rDNA, then use that phylogeny to examine the relationships of the bopyrid subfamilies, bopyroid families and epicarideans to cymothoid isopods. We tested the monophyly of the Epicaridea, evaluated hypotheses on relationships among epicaridean families and subfamilies, examined the evolution of the abdominal mode of infestation on caridean, gebiidean, axiidean and anomuran hosts and examined coevolution between epicarideans and their crustacean hosts. The molecular phylogeny indicated that Epicaridea were monophyletic with respect to Cymothooidea. Bopyroidea formed a monophyletic group without Dajidae and Entophilinae (now as Entophilidae). Both latter taxa grouped with Cryptoniscoidea, and this group was the sister taxon to the redefined Bopyroidea in all trees. The bopyrid subfamily Ioninae is the sister taxon to the other bopyrid subfamilies (except Entophilidae). Ioninae was elevated to family status but found not to be monophyletic; a new subfamily, Keponinae, was erected for all genera formerly placed in Ioninae except the type genus. The abdominal mode of parasitism appears to have evolved independently among the subfamilies. Coevolution between host and parasite phylogenies showed extensive incongruence, indicating frequent host-switching as a general pattern in Epicaridea.http://www.zoobank.org/urn:lsid:zoobank.

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Four new species and a new record of Cryptoniscoidea (Crustacea: Isopoda: Hemioniscidae and Crinoniscidae) parasitising stalked barnacles from New Zealand

Cited by 14 publications

References 0 publications

The Global Diversity of Parasitic Isopods Associated with Crustacean Hosts (Isopoda: Bopyroidea and Cryptoniscoidea)

The Global Diversity of Parasitic Isopods Associated with Crustacean Hosts (Isopoda: Bopyroidea and Cryptoniscoidea)

Exceptionally preserved cryptoniscium larvae - morphological details of rare isopod crustaceans from French Cretaceous Vendean amber

A molecular phylogeny of Bopyroidea and Cryptoniscoidea (Crustacea: Isopoda)

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