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

Thatcher, Vernon E.; Lopes, Luiza Paula C.; Froehlich, Otavio

doi:10.1590/S0101-81752002000600020

Abstract

Riggia acuticaudata sp. nov. is described on the basis of 10 female specimens recovered from the body cavity of the freshwater catfish, Ancistrus sp. The fish were caught in a stream called the Corrego Piraputanga, a tributary of the Paraguai River. The new species differs from the others in the genus by being smaller and less convex and by having a pleotelson that tapers abruptly rather than being the same width throughout. Also, the pereopods and dactyls are much smaller, the maxillule has two terminal and three subterminal spines and the first two pleopods are elongate and acute. Additionally, R. acuticaudata sp. nov. is from a different Order of fish host and a new geographic area.

Isopod parasite; cymothoid; fish parasite; Brazil

Riggia acuticaudata sp. nov. (Isopoda, Cymothoidae) from the body cavity of a reshwater fish of Mato Grosso do Sul State, Brazil¹ 1 ) Contribution number 1404 of the Departamento de Zoologia, Universidade Federal do Paraná.

Vernon E. Thatcher^I; Luiza Paula C. Lopes^II; Otavio Froehlich^II

^IDepartamento de Zoologia, Universidade Federal do Paraná. Caixa Postal 19020, 81531-980 Curitiba, Paraná, Brasil. Research Fellow of the CNPq

^IIDepartamento de Biologia, Universidade Federal de Mato Grosso do Sul. Caixa Postal 549, 79070-900 Campo Grande, Mato Grosso do Sul, Brasil

ABSTRACT

Riggia acuticaudata sp. nov. is described on the basis of 10 female specimens recovered from the body cavity of the freshwater catfish, Ancistrus sp. The fish were caught in a stream called the Corrego Piraputanga, a tributary of the Paraguai River. The new species differs from the others in the genus by being smaller and less convex and by having a pleotelson that tapers abruptly rather than being the same width throughout. Also, the pereopods and dactyls are much smaller, the maxillule has two terminal and three subterminal spines and the first two pleopods are elongate and acute. Additionally, R. acuticaudata sp. nov. is from a different Order of fish host and a new geographic area.

Key words: Isopod parasite, cymothoid, fish parasite, Brazil

Full text available only in PDF format.

Texto completo disponível apenas em PDF.

Received in 10.X.2002; accepted in 27.XI.2002.

Bastos, P.B. & V.E. Thatcher. 1997. 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. Mem. Inst. Oswaldo Cruz 92:755-760.
Szidat, L. 1948. Riggia paranensis n.g., n.sp., un isópodoparásito de la cavidad del cuerpo de "Curimata platana" Günther, del Rio Paraná. Rev. Inst. Invest. Mus. Argent. Cienc. Nat. 1:45-56.
Szidat, L. & O. Schubart. 1960. Neue und seltene parasitische süswasser-Asseln der familie Cymothoidae aus dem Rio Mogi Guassu, Brasilien (Isopoda). Ann. Acad. Brasil. Ciênc. 32:107-124.
Thatcher, V.E. 1991. Amazon fish parasites. Amazoniana, Ploen, 11:263-572.
______. 1997. Mouthpart morphology of six freshwater species of Cymothoidae (Isopoda) from Amazonian fish compared to that of three marine forms, with the proposal of Artystonenae subfam. nov. Amazoniana, Ploen, 14:311-322.
______. 2000. The isopod parasites of South American fishes, p. 193-226. In: G. Salgado-Maldonado; A.N. Garcia-Aldrete & V.M. Vidal-Martinez (Eds).. Metazoan Parasites in the Neotropics. México, D.F., Univ. Nac. Auton. México Press, 310p.

1

) Contribution number 1404 of the Departamento de Zoologia, Universidade Federal do Paraná.

Publication Dates

Publication in this collection
03 June 2009
Date of issue
Dec 2002

History

Accepted
27 Nov 2002
Received
10 Oct 2002

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

[1] Bastos, P.B. & V.E. Thatcher. 1997. 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. Mem. Inst. Oswaldo Cruz 92:755-760.

[2] Szidat, L. 1948. Riggia paranensis n.g., n.sp., un isópodoparásito de la cavidad del cuerpo de "Curimata platana" Günther, del Rio Paraná. Rev. Inst. Invest. Mus. Argent. Cienc. Nat. 1:45-56.

[3] Szidat, L. & O. Schubart. 1960. Neue und seltene parasitische süswasser-Asseln der familie Cymothoidae aus dem Rio Mogi Guassu, Brasilien (Isopoda). Ann. Acad. Brasil. Ciênc. 32:107-124.

[4] Thatcher, V.E. 1991. Amazon fish parasites. Amazoniana, Ploen, 11:263-572.

[5] ______. 1997. Mouthpart morphology of six freshwater species of Cymothoidae (Isopoda) from Amazonian fish compared to that of three marine forms, with the proposal of Artystonenae subfam. nov. Amazoniana, Ploen, 14:311-322.

[6] ______. 2000. The isopod parasites of South American fishes, p. 193-226. In: G. Salgado-Maldonado; A.N. Garcia-Aldrete & V.M. Vidal-Martinez (Eds).. Metazoan Parasites in the Neotropics. México, D.F., Univ. Nac. Auton. México Press, 310p.