Dactylogyridae, Bychowsky, 1933

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 : 7-8

Dactylogyridae

Aristocleidus hastatus Mueller, 1936 Fig. 6 A-C

Host: Diapterus rhombeus (Cuvier, 1829) ( Gerreidae ) New record. 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 39723, 39725. Type-host: Morone saxatilis (Walbaum, 1792) [as Roccus lineatus (Bloch, 1792) ], Moronidae

Type-locality: Peace River near Fort Ogden , Florida .

Other hosts: Diapterus auratus Ranzani, 1842 , Diapterus peruvianus (Cuvier, 1830) , D. rhombeus , Eugerres plumieri (Cuvier, 1830) , Eugerres brasilianus (Cuvier, 1830) , Gerres cireneus (Walbaum, 1792) ( Gerreidae ).

Other localities: Lagartos and Celestun estuaries, Yucatán Peninsula, Las Barrancas and Maquinas River in the state of Veracruz, Lake Gatun, near Barro Colorado Island in Panama and the Chautengo and Tres Palos Lagoon, Pacific Coast of Guerrero State, Mexico.

Description (based on 20 specimens). Body 220–325 (271; n = 12) long by 50–92 (71; n = 12) wide. Four eye-spots. Pharynx wide, spherical. Male copulatory organ 27–40 (32; n = 10) long, comprising proximal funnel-shape base, with well-developed flange, coiled thin tube with about one complete ring; accessory piece rod shaped. Vaginal pore sclerotized, dextral; vaginal tube delicate, extending to seminal receptacle. Haptor 55–82 (69; n = 12) wide. Ventral anchor 28–33 (30; n = 28) and point 12–17 (15; n = 28) with deeply incised base forming deep and superficial roots, straight shaft and point forming an angle of 90 o. Dorsal anchor 38–43 (40; n = 15) long, 20–24 (22; n = 15) base, elongated superficial root, short to nonexistent deep root, tapered shaft, elongated recurved point. Ventral bar 19–25 (22; n = 13) long, with elongated distally bifurcated anteromedian projection and bifurcated edges; dorsal bar 35–41 (38; n = 15) long, with slightly expanded ends, delicate anteromedian flange. Hooks similar in shape and size, 10–14 (12; n = 46) long, each with upright thumb, shank comprising a single subunit, filamentous hook (FH) loop about 80% shank.

Figures

Figure 6. Aristocleidus hastatus: (A) whole mount; (B) copulatory complex; (C) haptor, with anchor bars complex. Scale bars: A, C = 50 Μm, B = 20 Μm.