Levinseniella ( Monarrhenos ) anenteron ( Szidat, 1964 ) Deblock, 1978 Syn. Austromicrophallus anenteron Szidat, 1964 Larus dominicanus Lichtenstein L. maculipennis Lichtenstein . Site Maritrema orensensis Cremonte & Martorelli, 1998 Larus dominicanus Lichtenstein . Microphallus simillimus (Travassos, 1920) Martorelli, 1991 Himantopus melanurus Vieillot. Checklist of digenean parasites of birds from Argentina Cremonte, Florencia Drago, Fabiana B. Zootaxa 2007 1403 1 36 7NJSV (Ward, 1901) Travassos, 1920 (Ward, 1901) Travassos 1920 [237,753,1099,1123] Trematoda Microphallidae Animalia Plagiorchiida 12 13 Platyhelminthes family    Levinseniella cruziTravassos, 1920 Hosts:  Rollandia rolland chilensis(Lesson),  Himantopus melanurusVieillot,  Vanellus chilensislam­  pronotus(Wagler). Site of infection: ceca. Localities: Los Talas; Chascomús lagoon and Mar Chiquita coastal lagoon, Buenos Aires Province. Life history: Hi1:  Heleobia conexa(Gaillard),  H. parchappei(d’Orbigny)(natural hosts). Hi2:  Palaemonetes argentinusNobili(experimental and natural host); metacercariae in muscles, gonads, connective tissue. Material deposited: MLP, 3303C–3306C, USNPC 84905–84908. References: Martorelli (1988), Martorelli & Schuldt (1990), Martorelli & Ivanov (1996).    Levinseniella( Monarrhenos) anenteron( Szidat, 1964) Deblock, 1978 Syn.:  Austromicrophallus anenteron Szidat, 1964. Hosts:  Larus dominicanus Lichtenstein,  L. maculipennis Lichtenstein. Siteof infection: intestine.  Localities: San Carlos de Bariloche and Nahuel Huapí Lake, Río Negro Province; Huechulaufquen Lake, Lanín National Park, Neuquén Province. Reference: Szidat (1964).   MaritremaNicoll, 1907   Maritrema bonaerensisEtchegoin & Martorelli, 1997 Hosts:  Larus maculipennis Lichtenstein,  L. dominicanus Lichtenstein,  L. atlanticusOlrog. Siteof infection: intestine. Localities: Mar Chiquita coastal lagoon and Orense beach, Buenos Aires Province. Life history: Hi1:  Heleobia australis australis(d'Orbigny)(natural host). Hi2:  Cyrtograpsus angulatusDana(natural and experimental host),  Chasmagnathus granulataDana.(natural host); metacercariae in hepatopancreas. Material deposited: MLP, 3661a–b, 4583; USNPC, 87019, 87020. References: Etchegoin & Martorelli (1997a), Cremonte et al.(1999).    Maritrema orensensis Cremonte & Martorelli, 1998 Host:  Larus dominicanus Lichtenstein.  Site of infection: intestine. Locality: Orense beach, Buenos Aires Province. Material deposited: MLP, 3955–3956; IPCAS, D­405. Reference: Cremonte & Martorelli (1998).   MicrophallusWard, 1901    Microphallus simillimus(Travassos, 1920) Martorelli, 1991 Host:  Himantopus melanurusVieillot.  Site of infection: intestine. Locality: Mar Chiquita coastal lagoon, Buenos Aires Province. Life history: Hi1:  Heleobia conexa(Gaillard)(natural host); metacercariae in hepatopancreas and gonads. Material deposited: MLP, 3100 D­3102 D Reference: Martorelli (1991).   Microphallus szidatiMartorelli, 1986 Natural hosts:  Himantopus melanurusVieillot,  Pardirallus sanguinolentus sanguinolentus(Swainson),   Larus atlanticusOlrog. Experimental host:  Mus musculusL. Site of infection: intestine, ceca. Localities: Mar Chiquita coastal lagoon and Los Talas, Buenos Aires Province. Life history: Hi1:  Heleobia conexa(Gaillard),  H. parchappei(d’Orbigny)(natural hosts). Hi2:  Cyrtograpsus angulatusDana,  Chasmagnathus granulataDana(natural hosts); metacercariae in hepatopancreas; Palaeomonetes argentinusNobili (natural and experimental host); metacercariae in muscles, gonads and connective tissue. Material deposited: MLP, adult: 1319 C, metacercariae: 1319 D. References: Martorelli (1986a, 1986b, 1989a), Martorelli & Schuldt (1990), Etchegoin et al.(1996).   OdhneriaTravassos, 1921   Odhneria odhneriTravassos, 1921 Hosts:  Phalacrocorax brasilianus(Gmelin),  Larus dominicanus Lichtenstein. Locality: Fracasso beach, San José Gulf, Chubut Province. Site of infection: intestine. Material deposited: MLP, 4868. Reference: Cremonte & Etchegoin (2002).