Diplectanidae, Monticelli, 1903

Cohen, Simone Chinicz, Justo, Marcia Cristina Nascimento & Cárdenas, Melissa Querido, 2022, New records of Monogenoidea (Platyhelminthes) from three marine fish species from the coast of Angra dos Reis, Rio de Janeiro, Brazil, Zoologia (e 22024) 39, pp. 1-11 : 5

Diplectanidae

Neodiplectanum mexicanum ( Mendoza-Franco, Roche & Torchin, 2008) Domingues, Diamanka & Pariselle, 2011 Fig. 5 A-C

Host: Diapterus rhombeus (Cuvier, 1829) ( Gerreidae ) Locality: Brazil, Atlantic Ocean – Rio de Janeiro State • coast of Angra dos Reis, “Saco Piraraquara de Dentro”; 23°00’24”S, 44°19’05”W; CHIOC 39726a,b, 39727, 39728.

Type-host: Diapterus rhombeus (Cuvier, 1829)

Type-locality: Coast of Campeche State, Mexico (18°48’45”N, 92°03’45”W) in the Gulf of Mexico, Mexico

Other locality: Guaratuba Bay, Municipality of Guaratuba, Paraná, Brazil (25°52’19”S, 48°39’02”W) .

Description (based on 38 specimens). Body 300–670 (406; n = 20) long by 80–140 (107; n = 20) wide, fusiform. Four eye spots. Pharynx muscular, glandular. Intestinal caeca 2, non-confluent posteriorly, lacking diverticula. Genital pore opening midventral, posterior to copulatory complex. Male copulatory organ 50–66 (58; n = 21) long, sclerotized, tubular, enlarging distally; accessory piece sclerotized, non-articulated with male copulatory organ, distally hooked. One testis, postgermarian. Vaginal opening sinistral, vaginal atrium 30–35 (32; n = 15) long by 18–37 (28; n = 15), heavily sclerotized. Seminal receptacle spherical. Haptor 112–167 (139; n = 22) wide. Two squamodiscs 50–125 (87; n = 13) long by 62–125 (95; n = 13), one ventral and one dorsal, with 15 to 20 rows of sclerites. Anterior rows concentric. Ventral bar 75–107 (88; n = 21) with longitudinal groove; paired dorsal bars 40–53 (46; n = 29) long, medially expanded. Ventral anchor with well-developed superficial root and deep root, twice as long as superficial root; outer 35–39 (37; n = 11), inner 20–27 (22; n = 11), base 7–11 (9; n = 11). Dorsal anchor with conspicuous superficial and deep roots; outer 35–39 (36; n = 7), inner 21–25 (23; n = 7), base 7–10 (8; n = 7). Hooks similar 12–15 (13; n = 40) long, with depressed thumb, straight shaft, short point, uniform shank; filamentous hooklet (FH) loop nearly shank length.

Figures

Figure 5. Neodiplectanum mexicanum: (A) whole mount; (B) detail of the anterior region, showing copulatory complex and vagina; (C) haptor, showing the anchor bars complex and squamodisc. Scale bars: A = 100 Μm; B, C = 50 Μm.