Haliotrema gracilihamus Zhukov, 1976

Mendoza-Franco, Edgar F., Tun, Mariela del Carmen Rosado, Anchevida, Allan de Jesus Duarte & Rodriguez, Rodolfo E. del Rio, 2018, Morphological and molecular (28 S rRNA) data of monogeneans (Platyhelminthes) infecting the gill lamellae of marine fishes in the Campeche Bank, southwest Gulf of Mexico, ZooKeys 783, pp. 125-161 : 125

Haliotrema gracilihamus Zhukov, 1976

Haliotrema cornigerum Zhukov, 1976: 37-38, fig. 4; Kritsky et al. 2009b: 32-33, figs 79-85 (transferred to Haliotrematoides ).

Type host.

Lutjanus apodus

Present study.

L. griseus

Locality/prevalence, mean abundance and intensity range.

San Francisco: 61 fish (mean TL 28.1cm; range 21.6-39) infected of 65 examined (94 %); abundance, 13; intensity of infection, 7-20 worms. Seyba Playa: 30 fish (TL 28.5; 23-37) infected of 45 examined (66.6 %); abundance, 8; intensity of infection, 3-8. Champoton: 35 fish (TL 28.3; 25.2-37) infected of 37 examined (94.6 %); abundance, 11; intensity of infection, 8-15.

Supplementary observations

(measurements based on ten specimens). Body 345 (270-400; 10) long; greatest width 75 (60-95; 5). Haptor 67 (60-75; 6) wide. Pharynx 13 wide. MCO 35 (31-40; 9) long. Ventral anchor 51 (46-54; 10) long, base 18 (17-19; 5) wide; dorsal anchor 65 (61-69; 20) long. Ventral bar 31 (30-34; 5) long; dorsal bar 30 (29-31; 5) long.

Comments.

This species was originally described as Haliotrema gracilihamus on L. apodus from Campeche Bay (Area Havana) ( Zhukov 1976). Later, it was transferred to Haliotrematoides as Hal. gracilihamus from which it was redescribed based on specimens found on five lutjanids [ L. griseus , L. jocu , L. apodus , L. cyanopterus , and Lutjanus aratus ( Günther, 1864)] from the northern Gulf of Mexico (Florida), Mexican Caribbean (off Isla Mujeres and Quintana Roo), Caribbean Sea off Panama, and the Eastern Pacific off Nicaragua ( Kritsky et al. 2009b). This species is differentiated from its congeners in having a coiled tube of the MCO with two complete counterclockwise rings and ventral bar with posteromedial shield-like process, and anteromedial flap having two bilateral pockets. Morphometric comparison of the present material with the redescription of this species provided by Kritsky et al. (2009b) did not reveal any differences.

Specimens deposited.

Ten reference specimens in the CNHE (10606).