Mariauxiella pimelodi n. g., n. sp. (Cestoda: Monticelliidae): a parasite of pimelodid siluroid fishes from South America

Abstract

Mariauxiella pimelodi n. g., n. sp. (Cestoda, Monticelliidae, Othinoscolecinae) is described from the South American siluriform fishes Pimelodus ornatus and Pimelodus sp. caught in Brazil and Paraguay. When compared with other genera of South American monticelliids, the new genus exhibits the following morpho-anatomical characters: the particular development of the distal circular musculature of the suckers acting as a sphincter; the medullar ovary projecting numerous lobules into the dorsal cortex; and the uterus situated in the ventral cortex but with numerous outgrowths penetrating the medulla and reaching the dorsal cortex in pregravid proglottids. The new species is the fourth monticelliid cestode recorded from Pimelodus. ResumoMariauxiella pimelodi n. g., n. sp. (Cestoda, Monticelliidae, Othinoscolecinae) 6 descrita do peixe siluriforme Pimelodus ornatus e Pimelodus sp, colectados no rio Cuiabzi em Mato Grosso e no rio Parami, Paran~, Brasil e no rio Pirapo, em Caazapa, Paraguay. Este genero se diferencia dos outros g~neros descritos de Monticelideos pelos seguintes caracteres, mais importantes: a musculatura especial das ventosas, lembrando esfincter, mas de morfologia diferente; o ovario medular, mas projetando foliculos no cortex dorsal; o utero, localizado no cortex ventral, mas seus diverticulos projetam pequenas h6rnias, que atravessam a medula e atingem o cortex dorsal. Esta 6 aquarta especie descrita de hospedeiro do genero Pimelodus.

Luciaella ivanovae n. g., n. sp. (Eucestoda: Proteocephalidea: Peltidocotylinae), a parasite of Ageneiosus inermis (L.) (Siluriformes: Auchenipteridae) in Argentina

“…5C). In Mariauxiella pimelodi de Chambrier & Rego, 1995 andM. piscatorum de Chambrier &Vaucher, 1999, the uterus penetrates the medulla of immature proglottides early (de Chambrier & Rego, 1995;de Chambrier & Vaucher, 1999).…”

“…In Mariauxiella pimelodi de Chambrier & Rego, 1995 andM. piscatorum de Chambrier &Vaucher, 1999, the uterus penetrates the medulla of immature proglottides early (de Chambrier & Rego, 1995;de Chambrier & Vaucher, 1999). Zehnder & de Chambrier (2000) studied Peltidocotyle using morphological and molecular characteristics; a medullary ovary is indicated in the diagnosis of the genus and is shown in transverse sections of the proglottides (their figures 6, 7 and 2).…”

“…Mariauxiella possesses a massive scolex with uniloculate suckers provided with a powerful circular musculature in their distal region (de Chambrier & Rego, 1995).…”

“…A. brevifilis Valenciennes) collected in the Paraná River basin revealed the presence of an undescribed tapeworm in their intestines. The specimens were assigned to the Peltidocotylinae Woodland, 1934, but they could not be allocated to any of the recognised genera (Rego & Pavanelli, 1985;de Chambrier & Rego, 1995;Zehnder & de Chambrier, 2000;de Chambrier, 2001). A new genus is proposed to accommodate the species, which is described in the present article.…”

A new genus and species of proteocephalidean tapeworm (Cestoda), first parasite found in the driftwood catfish Tocantinsia piresi (Siluriformes: Auchenipteridae) from Brazil

“…The terminal part of the vagina of Mariauxiella pimelodi de Chambrier et Rego, 1995, a parasite of Pimelodus ornatus Kner and Pimelodus sp. from Brazil, is also enlarged, but symmetrically (see fig.…”