Euryhaliotrema longibaculum ( 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

Euryhaliotrema longibaculum ( Zhukov, 1976) n. comb.

Haliotrema longibaculum Zhukov, 1976: 39 .

MATERIAL EXAMINED. — Voucher specimen from Lutjanus synagris, Gulf of Campeche (Gulf of Mexico) ( USNPC 91427).

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

MEASUREMENTS

Ventral anchor 27 (25-28; n = 2) long, base 13 (12-14; n = 2) wide; dorsal anchor 45 (43-46; n = 2) long, base 9-10 (n = 2) wide.

REMARKS

The original description of this species as Haliotrema longibaculum by Zhukov (1976) indicates that the body is fusiform and the vaginal aperture is dextroventral in the body, while the direction of the coil of the copulatory organ is uncertain. Although not a part of the type series, the specimen of H. longibaculum available to us was collected by Dr Zhukov and was apparently used to complement his description of the species (Timofeeva pers. comm.). The unstained specimen is severely flattened and damaged, and it was not possible to determine many diagnostic features of internal anatomy and of the sclerotized parts of the haptor and copulatory complex. Nonetheless, this species is clearly a member of Euryhaliotrema n. gen. as shown by the presence of a bulbous base of the copulatory organ. Zhukov (1976) shows the bulbous base of the copulatory organ in his drawing of the copulatory complex but the bulb was not illustrated in his drawing of the terminal reproductive genitalia ( Zhukov 1976: fig. 6). Thus, Euryhaliotrema longibaculum n. comb. is proposed. It differs from all other described species of Euryhaliotrema n. gen. in having a comparatively broad copulatory tube comprising less than one ring. The accessory piece is articulated to the base of the copulatory organ by a straight stout articulation process. The ventral anchor possesses a narrow base with an elongate superficial root, while the deep root is short to nonexistent.