Trematodes of the family Heterophyidae (Digenea) in Mexico: a review of species and new host and geographical records Author Scholz, T. Author Aguirre-Macedo, M. L. Author Salgado-Maldonado, G. text Journal of Natural History 2001 2001-12-31 35 12 1733 1772 http://www.tandfonline.com/doi/abs/10.1080/00222930152667087 journal article 10.1080/00222930152667087 1464-5262 5275922 Ascocotyle ( Ascocotyle ) tenuicollis Price, 1935 (®gure 2) Metacercaria Morphology . Aguirre-Macedo and GarcõÂa-MaganÄa (1994: 17; ®gure 7a, b), Scholz et al . (1995: 179 ; ®gure 3A, C±E) and Scholz et al . (1997a: 163 ; ®gure 1E±G, I) provided detailed descriptions of metacercariae that can easily be distinguished from those of other Ascocotyle species by combination of the following features: cyst spherical, thin-walled; body pyriform; preoral lobe prominent; posterior appendage long, curved to convoluted, reaching to pharynx or overlapping it; oral sucker with 32 circumoral spines forming two complete rows of 16 spines each; intestinal caeca short, very wide, sacciform, preacetabular, containing discoidal corpuscles; excretory bladder voluminous, ®lled with large lipoid droplets. FIG. 2. Ascocotyle ( Ascocotyle ) tenuicollis . Adults from the intestine of Casmerodius albus , PaÂtzcuaro Lake, MichoacaÂn , misidenti®ed as Ascocotyle leighi (CNHE 1532) . (A) Total view, ventrally; (B) anterior end (spines of the posterior row on the dorsal side not ®gured); (C, D) detail of the terminal genitalia, ventral and lateral views, respectively. Abbreviations: ed, ejaculatory duct; eg, eggs; g, gonotyl; gp, genital pore; ic, intestinal caecum; mvs, mouth of ventrogenital sac; oe, oesophagus; ph, pharynx; sv, seminal vesicle; u, uterus; vf, vitelline follicles; vs, ventral sucker. Second intermediate hosts . Astyanax fasciatus (Cuvier) , Bramocharax caballeroi Contreras-Balderas and Rivera-Teillery (Characidae) ; Poecilia catemaconis Miller , P. latipunctata Meek , P. mexicana Steindachner , P. petenensis (GuÈnther) , P. velifera (Regan) , Poeciliopsis catemaco Miller (Poeciliidae) ; Cichlasoma argentea Allgayer , C. aureum (GuÈnther) , C. fenestratum (GuÈnther) , C. friedrichstahli (Heckel) , C. geddesi (Regan) , C. helleri (Steindachner) , C. intermedium (GuÈnther) , C. lentiginosum (Steindachner) , C. managuens e (GuÈnther), C. nourissati (Allgayer) , C. octofasci - atum (Regan), C. pearsei (Hubbs) , C. salvini (GuÈnther) , C. synspilum Hubbs , C. urophthalmus (GuÈnther) , Cichlasoma sp. , Petenia splendida (GuÈnther) (Cichlidae) ; Ophisternon aenigmaticum Rosen and Greenwood (Synbranchidae) . Site of infection . Heart, exceptionally gill arches. Distribution . Campeche (El Vapor, El Viento, La Pera, Palizada, Rancho II, Santa Gertrudis); Chiapas (Cedros, LacanjaÂ); Quintana Roo (Bacalar, Box Toro, CabanÄas, Cenote Azul, Escondido, FramboyaÂn, La UnioÂn, Laguna Paiyegua, Mahahual, Ramonal, Raudales, RõÂo Hondo); Tabasco (Camellones Chontales, El Espino, Puyacatengo, Santa Anita, Tucta, YumkaÂ); Veracruz (Catemaco, Los TuxtlasÐBalzapote, La Palma, Las MaÂquinas); YucataÂn (CelestuÂn, Chaamac, Chen-haÂ, DzibilchaltuÂn, Mitza, Noc-choncunchey, Sahkaba). References from Mexico . Aguirre-Macedo and GarcõÂa-MaganÄa (1994); Scholz et al . (1995 , 1997a ); Salgado-Maldonad o et al. (1997) ; Scholz and Vargas-VaÂzquez (1998) ; Vidal-MartõÂnez et al . (2000); present study. Specimens deposited . CHCM-137, IPCAS D-345. Adult Morphology . Scholz et al. (1997a: 163 and 165; ®gure 1A±D, H) described adults from naturally and experimentally infected de®nitive hosts. The adult of A . ( A .) tenuicollis from the intestine of Casmerodius albus Linnaeus from PaÂtzcuaro Lake (MichoacaÂn), previously misidenti®ed as A . leighi (CNHE 1532Ðsee Comments) , is illustrated in ®gure 2. De W nitive hosts . Ardea herodias , Casmerodius albus , Buteogallus anthracinus (Deppe) , Phalacrocora x olivaceus (Humboldt) . Site of infection . Intestine. Distribution . Jalisco ( Salinas de Careyes), MichoacaÂn (PaÂtzcuaro), YucataÂn (CelestuÂn). References from Mexico . Aguirre-Macedo and GarcõÂa-MaganÄa (1994); Scholz et al . (1997a) ; present study. Specimens deposited . CHCM-361, IPCAS D-344. Comments . Cichlids are the most suitable second intermediate hosts but ®sh of other families may also harbour metacercariae that are normally encysted within the bulbus of the heart ( Scholz et al ., 1997a ). Adults have been found in four species of ®sh-eating birds in Mexico , two of which ( A. herodias and P. olivaceus ) are new de®nitive hosts of this parasite. SepuÂlveda et al . (1999) found A. ( A .) tenuicollis to belong to the most frequent (prevalence 54%) and numerous (mean intensity of infection 112 specimens ; range 1±1260) helminth parasites of Casmerodius albus in Florida.