Southwellina hispida Van Cleave, 1925

(Fig. 10)

Localitiy. VERACRUZ: Laguna la Rivera.

Specimens deposited. CNHE 7776.

Remarks. The 2 specimens collected in the present study correspond to Southwellina hispida by possessing two fields of spines in the anterior region of the trunk, a proboscis cylindrical armed with 16 to 17 longitudinal circles of 12 to 15 hooks each, conical neck, and a double-walled proboscis receptacle (see Schmidt, 1973). This acanthocephalan species use crustacean decapod ( Procambarus clarkii Girard) and fish-eating birds to complete their life-cycle. However, snakes, frogs, freshwater and brackish water fish, serve as paratenic hosts (Schmidt 1985). In Mexico, adults of S. hispida parasitize several heron species (García-Varela & Pérez Ponce de León 2008; Barrera-Guzmán & Guillén-Hernández 2008; García-Prieto et al. 2010), whereas cystacanths have been found in the mesentery of fish (Vidal-Martínez et al. 2001; Violante-González et al. 2007; García-Prieto et al. 2010). The two specimens found in the intestine are immature and this may indicate that the white ibis is an accidental host.