Trematodes of the family Heterophyidae (Digenea) in Mexico: a review of species and new host and geographical records
Scholz, T.
Aguirre-Macedo, M. L.
Salgado-Maldonado, G.
Journal of Natural History
2001
2001-12-31
35
12
1733
1772
8SWQT
Price, 1935
Price
1935
[310,830,603,627]
Trematoda
Heterophyidae
Ascocotyle
Animalia
Plagiorchiida
7
1738
Platyhelminthes
species
tenuicollis
Ascocotyle
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 Ascocotylespeciesby 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 caballeroiContreras-Balderas and Rivera-Teillery (Characidae); Poecilia catemaconisMiller, P. latipunctataMeek, P. mexicanaSteindachner, P. petenensis(GuÈnther), P. velifera(Regan), Poeciliopsis catemacoMiller (Poeciliidae); Cichlasoma argenteaAllgayer, C. aureum(GuÈnther), C. fenestratum(GuÈnther), C. friedrichstahli(Heckel), C. geddesi(Regan), C. helleri(Steindachner), C. intermedium(GuÈnther), C. lentiginosum(Steindachner), C. managuense(GuÈnther), C. nourissati(Allgayer), C. octofasci- atum(Regan), C. pearsei(Hubbs), C. salvini(GuÈnther), C. synspilumHubbs, C. urophthalmus(GuÈnther), Cichlasomasp., Petenia splendida(GuÈnther) (Cichlidae); Ophisternon aenigmaticumRosen and Greenwood (Synbranchidae). Siteof 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: 163and 165; ®gure 1A±D, H) described adults from naturally and experimentally infected de®nitive hosts. The adult of A. ( A.) tenuicollisfrom the intestine of Casmerodius albusLinnaeusfrom PaÂtzcuaro Lake (MichoacaÂn), previously misidenti®ed as A. leighi(CNHE 1532Ðsee Comments), is illustrated in ®gure 2. DeW nitive hosts. Ardea herodias, Casmerodius albus, Buteogallus anthracinus(Deppe), Phalacrocora x olivaceus(Humboldt). Siteof infection. Intestine. Distribution. Jalisco( Salinasde 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. herodiasand P. olivaceus) are new de®nitive hosts of this parasite. SepuÂlveda et al. (1999) found A.( A.) tenuicollisto belong to the most frequent (prevalence 54%) and numerous (mean intensity of infection 112 specimens; range 1±1260) helminth parasites of Casmerodius albusin Florida.