The Ascothoracid crustacean Ascothorax gigas: Redescription, larval development, and notes on its infestation of the Antarctic ophiuroid Ophionotus Victoriae

Grygier, Mark J.; Fratt, David B.

doi:10.1029/ar041p0043

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…In Ría de Puerto Deseado (Santa Cruz, Argentina) an infected individual of A. antarctica presented atrophied pyloric caeca which was explained by the lack of available space in the celomic cavity (Grygier & Salvat, 1984;Salvat, 1985). In heavy infestation of Ophionotus victoriae by Ascothorax gigas, the stomach volume was observed to be reduced, but there was no demonstrable reduction in the volume of stomach contents (Grygier & Fratt, 1986). The reduction of the stomach volume, also noted in this study, can be related to the endoparasite feeding on the celomic fluids of the host as Brattström (1947) determined for Ulophysema oeresundense parasite and its echinoid host.…”

Section: Discussionsupporting

confidence: 71%

Noble hosts: effects of internal parasites on the physiology of an intertidal brooding Sea-star

Fraysse,

Boy,

Veyñ

et al. 2024

Rev. Biol. Trop.

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Introduction: The endoparasite Dendrogaster argentinensis infects the intertidal brooder sea star Anasterias antarctica. This sea-star species is in the highest trophic level in the Beagle Channel. Objective: To study the effects of parasitism by D. argentinensis on the fitness and reproduction of A. antarctica. Methods: Adults from the brooder sea-star were collected from the rocky intertidal of Ensenada Zaratiegui bay (54°51’ S & 68°29’ W), Argentina. Eight seasonal samplings were performed (four seasons in two years) in the upper and low intertidal. During dissection, parasites were removed, and all organs were extracted and weighed separately. Results: Dendrogaster argentinensis prevalence was the highest for the region (20.4 %). Parasitized individuals were more frequent in the low intertidal in all seasons, with a higher difference in summer, where it is likely that the higher temperatures and strong winds could make the upper intertidal more challenging for a parasitized individual. Five parasitized individuals were castrated. Generally, the gonadal (GI) and somatic (pyloric caeca, PCI; stomach, SI; body wall, WI) indexes were lower in parasitized than non-parasitized individuals. Conclusions: Parasitism by D. argentinensis negatively affects A. antarctica condition. It affects reproduction because it reduces the GI, and can also produce castration. The parasite competes for the sea-stars’ energetic resources, also decreasing the individual’s capacity for feeding (reduced stomach) and growth (reduced body wall).

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Section: Discussionsupporting

confidence: 71%

Noble hosts: effects of internal parasites on the physiology of an intertidal brooding Sea-star

Fraysse,

Boy,

Veyñ

et al. 2024

Rev. Biol. Trop.

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“…Currently this taxon is comprised of more than 100 described species assigned to two orders (Grygier1987a, 1996): Laurida, species of which are parasites of anthozoans except for those of Waginella Grygier, 1983a, which are ectoparasites of crinoids, and Dendrogastrida, species of which are parasites of non-crinoid echinoderms. Ascothoracidans are normally dioecious, the larger females being accompanied by smaller, sometimes dwarf, cypridiform males (Grygier and Fratt 1984; Grygier 1985a, 1987b, 1991a, b; Kolbasov 2007). However, members of Petrarcidae and possibly Ctenosculidae are simultaneous hermaphrodites (Okada 1938; Grygier 1983b, c).…”

Section: Introductionmentioning

confidence: 99%

A new species of Synagoga (Crustacea, Thecostraca, Ascothoracida) parasitic in an antipatharian from Green Island, Taiwan, with notes on its morphology

Kolbasov¹,

Petrunina²,

Ho³

et al. 2019

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A new ascothoracidan species has been discovered off Taiwan in the north part of the west Pacific at SCUBA depths. Twelve specimens including both sexes of the new species, described herein as Synagoga arabesquesp. nov., were collected from colonies of the antipatharian Myriopathes cf. japonica Brook, 1889. Three previously described species of Synagoga, morphologically the least specialized ascothoracidan genus, have been found as ectoparasites of antipatharians and an alcyonarian, whereas all other records of this genus have been based on specimens collected from the marine plankton. This is the second study of a new form of Synagoga to be based on more than a few mature specimens of a single sex or on a single juvenile. Furthermore, it is the second in which SEM has been used to document the fine-scale external morphology. The position of terminal pores in the anterior pairs of the lattice organs is different in Synagoga arabesquesp. nov. than those in S. grygieri Kolbasov & Newman, 2018 and S. millipalus Grygier & Ohtsuka, 1995. Species of Synagoga are small, host-specific predators or ectoparasites of antipatharians. This genus exhibits a major Tethyan reliction pattern.

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“…The monophyly of these two orders is yet to be tested by molecular methods (Chan et al, 2021). The ascothoracidans are largely dioecious, with larger females and smaller, sometimes dwarf cypridiform males (Grygier and Fratt, 1984;Grygier, 1985Grygier, , 1987bGrygier, , 1991aKolbasov, 2007). The family Petrarcidae, and possibly some of Ctenosculidae, are endoparasites in scleractinian corals and sea stars and have secondarily evolved hermaphroditism (Okada, 1938;Grygier, 1983b,c).…”

Section: Introductionmentioning

confidence: 99%

A New Species of Waginella (Crustacea: Thecostraca: Ascothoracida) Parasitic on a Stalked Crinoid From Tasman Sea, With Notes on Morphology of Related Genera

et al. 2021

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A new ectoparasitic ascothoracidan species has been discovered off northern Tasman Sea at a depth of 520 m. Single female, described herein as Waginella ebonita Kolbasov and Newman sp. nov. in the family Synagogidae Gruvel, 1905, was collected on the column of crinoid Metacrinus sp. This is the first study of a new form of Waginella to be based on the extensive use of both light and scanning electron microscopy to document the fine-scale external morphology. We studied the external morphology of other two species of Waginella, W. cf. axotremata and W. sandersi utilizing SEM and compared fine structures of all congeners. The genus Waginella represents a monophyletic taxon including at least 4 species having similar and unique morphology even on the ultrastructural level. Two species, W. cf. axotremata and W. cf. metacrinicola may represent at least two complexes of species. The morphology of an attachment apparatus in all species of Waginella suggests that they remain attached to the host for a considerable period of time. The lattice organs of Waginella have a unique structure distinguishing from all Thecostraca. Waginella ebonita sp. nov. is the second species of this genus known to harbor hyperparasitic cryptoniscid isopods representing parasitic castrators.

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The Ascothoracid crustacean Ascothorax gigas: Redescription, larval development, and notes on its infestation of the Antarctic ophiuroid Ophionotus Victoriae

Cited by 9 publications

References 7 publications

Noble hosts: effects of internal parasites on the physiology of an intertidal brooding Sea-star

Noble hosts: effects of internal parasites on the physiology of an intertidal brooding Sea-star

A new species of Synagoga (Crustacea, Thecostraca, Ascothoracida) parasitic in an antipatharian from Green Island, Taiwan, with notes on its morphology

A New Species of Waginella (Crustacea: Thecostraca: Ascothoracida) Parasitic on a Stalked Crinoid From Tasman Sea, With Notes on Morphology of Related Genera

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