Curvianchoratus Hanek, Molnar & Fernando, 1974

Bezerra, Carine Almeida Miranda, Cohen, Simone Chinicz, de Meneses, Yuri Costa, Neres, Helyab Gabriel Chaves, Viana, Diego Carvalho & Justo, Marcia Cristina Nascimento, 2023, Two new species of Curvianchoratus (Monogenoidea, Dactylogyridae) parasitizing Psectrogaster amazonica (Characiformes, Curimatidae) and a new record for Curvianchoratus singularis in the Tocantins River, Maranhao, Brazil, ZooKeys 1172, pp. 101-116 : 101

Curvianchoratus Hanek, Molnar & Fernando, 1974

Emended diagnosis.

Tegument smooth, thin. Body elongated; divisible into cephalic area, trunk, peduncle, and haptor. Terminal and lateral cephalic lobes developed or not; head organs and cephalic glands present. Eyespots present or absent. Mouth subterminal, midventral, prepharyngeal. Pharynx muscular; esophagus short. Intestinal caeca two, not presenting diverticula. Common genital pore midventral near the level of intestinal bifurcation. Gonads intercaecal, overlapping or not; testis dorsal to germarium. Seminal vesicle large, dilated portion of vas deferens; prostatic reservoir single. Copulatory complex comprising male copulatory organ (MCO) and accessory piece; MCO consisting of sclerotized coiled tube with counterclockwise rings, which make a short turn on itself near the base; cirrus and accessory piece articulated basally. Accessory piece with bifurcated distal portion, pincer-shaped. Ovary pretesticular. Vagina medial or sinistral. Vitellaria well developed, coextensive with intestinal ceca, absent from regions of other reproductive organs. Peduncle short, haptor subquadrate. Ventral bar present or absent. Dorsal bar absent. Ventral anchor of dactylogyrid type. Dorsal anchor modified, composed by two subunits, dorsal-median and dorsal, forming a full circle, the shaft of the dorsal subunit passes over the superficial root of the dorsal-median subunit anchor. Hooks 14; 5 pairs ventral, 2 pairs dorsal, with inflated base and slender shank. Parasites of curimatid fishes.

Remarks.

Curvianchoratus was proposed to accommodate Curvianchoratus hexacleidus Hanek, Molnár & Fernando, 1974, a parasite of the characiform S. argentea from the Arouca River, Trinidad ( Hanek et al. 1974). The main characteristic of Curvianchoratus is the haptor with a modified dorsal anchor, composed of two subunits, which is a unique shape for the genus. The absence of bars in one of the species described here, made it necessary to expand the original diagnosis of the genus to include the characteristics of the new species described below, as well as to detail some morphological characters.