Euryhaliotrema torquecirrus ( Zhukov, 1976 ) Kritsky & Boeger, 2002

Kritsky, Delane C. & Boeger, Walter A., 2002, 41: New and previously described species of Dactylogyridae (Platyhelminthes) from the gills of marine and freshwater perciform fishes (Teleostei) with proposal of a new genus and a hypothesis on phylogeny, Zoosystema 24 (1), pp. 7-40 : 32-33

Euryhaliotrema torquecirrus ( Zhukov, 1976) n. comb.

Haliotrema torquecirrus Zhukov, 1976: 41 , 42.

MATERIAL EXAMINED. — Three voucher specimens from Ocyurus chrysurus, Gulf of Campeche (Gulf of Mexico) ( USNPC 91432).

PREVIOUS RECORDS. — Gills of Lutjanus synagris , Ocyurus chrysurus (type host) ( Lutjanidae ): Havana and Gulf of Campeche (Gulf of Mexico) ( Zhukov 1976). According to Timofeeva (pers. comm.), the holotype of E. torquecirrus n. comb. was collected from O. chrysurus .

MEASUREMENTS

Copulatory organ ring diameter 31-32 (n = 1); accessory piece 35-36 (n = 1) long; ventral anchor

24-25 (n = 2) long, base 14-15 (n = 1) wide; dorsal anchor 26 (25-27; n = 2) long, base 14-15 (n = 2) wide; ventral bar 30-31 (n = 1) long; dorsal bar 30- 31 (n = 1) long; hook 13-14 (n = 8) long.

REMARKS

The three vouchers from Zhukov’s collection are unstained, flattened and highly cleared and one specimen is badly damaged. While it was not possible to determine features of the internal organ systems from available specimens, the body of E. torquecirrus n. comb. is apparently fusiform and the vaginal aperture appears to be dextroventral. The copulatory organ has three rings and a large bulbous base, the accessory piece is distally bilobed, and the hook possesses an upright acute thumb and slender shank comprised of one subunit. Although the species requires redescription, these features are sufficient to place it in Euryhaliotrema n. gen.; E. torquecirrus n. comb. is proposed. Based on the morphology of the copulatory complex, E. torquecirrus n. comb. most closely resembles E. chrysotaeniae n. comb., from which it differs in having a more robust accessory piece and ventral anchors with well differentiated roots.