A Redescription of Riggia paranensis Szidat, 1948 (Isopoda, Cymothoidae) Based on Thirty-two Specimens from Curimatid Fish of Rio de Janeiro, Brazil, with an Emendation of the Genus

Bastos, Paula B; Thatcher, Vernon E.

doi:10.1590/s0074-02761997000600005

Cited by 14 publications

(22 citation statements)

References 3 publications

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“…SZIDAT & SCHUBART (1960) reported that R. paranensis has a dwarf male that measures slightly more than 5 mm in length. BASTOS & THATCHER (1997) were able to confirm this observation. Perhaps all species of Riggia have dwarf males since the male of the new species also measured around 5 mm in length.…”

Section: Discussionsupporting

confidence: 57%

“…nov. is most similar to R. paranensis which has been reported to be 14-28 mm long and 10-20 mm wide (BASTOS & THATCHER, 1997). R. brasiliensis is larger, 33 x 28 mm and R. nana smaller, 14 x sp.…”

Section: Discussionmentioning

confidence: 54%

“…Measurements are in micrometers (µm) unless specified as millimeters (mm). Szidat, 1948, Bastos & Thatcher, 1997 Riggia cryptocularis sp. Szidat, 1948, but differs from that species in the following respects.…”

Section: Methodsmentioning

confidence: 99%

“…Later, SZIDAT & SCHUBART (1960) added two more species, namely: R. nana and R. brasiliensis found in freshwater fishes of São Paulo State, Brazil. BASTOS & THATCHER (1997) redescribed the type species based on specimens from Rio de Janeiro State and emended the generic diagnosis. According to TRILLES (1991) and THATCHER (2000) only the above three species had been attributed to this genus.…”

mentioning

confidence: 99%

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Riggia cryptocularis sp. nov. (Isopoda, Cymothoidae) from the body cavity of a freshwater fish of Mato Grosso do Sul State, Brazil

2003

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Riggia cryptocularis sp. nov. (Isopoda, Cymothoidae) is described on the basis of one female and one male specimen from the body cavity of freshwater fish from Mato Grosso do Sul State, Brazil. The new species is similar in size to R. paranensis Szidat, 1948, but differs from that species in the following respects. The body shapes are different since the widest part of the adult female is more anterior in R. paranensis. The eyes of the new species are covered and non-functional unlike those of the other species. The cephalon of the new species has a postero-dorsal elevation and a rounded and depressed frons which are lacking in the other species. Pereonites 5-7 are subequal in length in the new species and decrease in length in R. paranensis. The pleon/pleotelson tapers in the female of the new species and in the other it is bluntly rounded and with nearly parallel sides. The pleopods of R. cryptocularis sp. nov. also taper while those of R. paranensis are rounded. The recently described species, R. acuticaudata Thatcher, Lopes & Froehlich, 2002, was also obtained in Mato Grosso do Sul State but differs greatly from the presently described species. The body of R. acuticaudata is much smaller, and more rounded. The eyes of this species are large and functional, the dorsum of the cephalon lacks a dorsal prominence and the pleon/pleotelson tapers more abruptly

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Section: Discussionsupporting

confidence: 57%

Section: Discussionmentioning

confidence: 54%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Riggia cryptocularis sp. nov. (Isopoda, Cymothoidae) from the body cavity of a freshwater fish of Mato Grosso do Sul State, Brazil

2003

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“…The parasite Riggia paranensis Szidat, 1948 is one isopod crustacean species that infests species of Cyphocharax (Bastos & Thatcher, 1997). Like some species of the family Cymothoidae, only females are parasites (Raibaut & Trilles, 1993).…”

Section: Introductionmentioning

confidence: 99%

Mercury concentration in the freshwater bonefish Cyphocharax gilbert (Curimatidae) and its parasite the crustacean Riggia paranensis (Cymothoidae)

Lins¹,

Meirelles

Malm

et al. 2008

Neotrop. ichthyol.

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Fish parasites can accumulate heavy metals reaching higher concentrations than the host and may affect the host's bioaccumulation. The present study compared total mercury concentration in the liver and muscle of Cyphocharax gilbert and in the parasite Riggia paranensis sampled in the middle Itabapoana River, Brazil, also considering the reproductive stages of both fish and parasite. Mean concentrations of mercury in muscle of fish varied from 20.8 ng.g -1 in mature females to 38.1 ng.g -1 in postspawning females. The mean concentrations in fish liver varied from 60.9 ng/g in post-spawning females to 110.4 ng.g -1 in infested males. The mean concentration of mercury in parasites varied from 26.2 ng.g -1 in specimens carrying early embryo to 39.5 ng.g -1 in specimens with eggs. Positive and significant associations (P≤0.05) were found between the total mercury concentrations in parasites and muscle of host (both females and males), and between concentrations in parasites and in the liver of male hosts. These results suggest that R. paranensis can be used to indicate mercury levels in edible parts of C. gilbert.Parasitos de peixes podem acumular metais pesados em concentrações acima dos hospedeiros, podendo afetar a bioacumulação nestes. O presente estudo comparou a concentração total do mercúrio no fígado e no músculo de Cyphocharax gilbert e no parasito Riggia paranensis, coletados no trecho médio do rio Itabapoana, Brasil, considerando o estágio reprodutivo tanto dos peixes como dos parasitos. A concentração média do mercúrio nos músculos dos peixes variou entre 20,8 ng.g -1 nas fêmeas maturas e 38,1 ng.g -1 nas fêmeas desovadas. As concentrações médias nos fígados dos peixes variaram entre 60,9ng/g em fêmeas desovadas e 110,4 ng.g -1 em machos parasitados. Entre os parasitos, as concentrações médias de mercúrio variaram entre 26,2 ng.g -1 em espécimes com embriões iniciando o desenvolvimento to 39,5 ng.g -1 em espécimes com ovos . Associações positivas e significativas (P≤0.05) foram encontradas entre as concentrações totais de mercúrio em parasitos e músculos dos hospedeiros (tanto em macho como em fêmeas) e entre as concentrações nos parasitos e os fígados dos hospedeiros machos. Estes resultados sugerem que o parasito R. paranensis pode ser utilizado como bioindicador dos níveis de mercúrio nas partes comestíveis de C. gilbert.

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Biodiversity and Taxonomy of the Parasitic Crustacea

Boxshall

Hayes

2019

Parasitic Crustacea

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A Redescription of Riggia paranensis Szidat, 1948 (Isopoda, Cymothoidae) Based on Thirty-two Specimens from Curimatid Fish of Rio de Janeiro, Brazil, with an Emendation of the Genus

Cited by 14 publications

References 3 publications

Riggia cryptocularis sp. nov. (Isopoda, Cymothoidae) from the body cavity of a freshwater fish of Mato Grosso do Sul State, Brazil

Riggia cryptocularis sp. nov. (Isopoda, Cymothoidae) from the body cavity of a freshwater fish of Mato Grosso do Sul State, Brazil

Mercury concentration in the freshwater bonefish Cyphocharax gilbert (Curimatidae) and its parasite the crustacean Riggia paranensis (Cymothoidae)

Biodiversity and Taxonomy of the Parasitic Crustacea

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