Descripción de una especie nueva de Tylodelphys (Digenea:Diplostomidae) parásita de Podiceps major (Aves:Podicepediae) de Argentina

Abstract

A NEW SPECIES OF DIPLOSTOMID, TYLODELPHYS ADULTA SP. NOV. (DIGENEA: DIPLOSTOMIDAE), IS DESCRIBED ON THE BASIS OF ADULT SPECIMENS FOUND IN THE INTESTINE OF NATURALLY INFECTED GREAT GREBES, PODICEPS MAJOR (BODDAERT), FROM LACOMBE LAGOON, BUENOS AIRES PROVINCE, ARGENTINA. THIS NEW SPECIES IS DESCRIBED ON THE BASIS OF ADULT SPECIMENS IN THE INTESTINE OF NATURALLY INFECTED GREAT GREBES, PODICEPS MAJOR (BODDAERT), FROM LACOMBE LAGOON, BUENOS AIRES PROVINCE, ARGENTINA. THIS NEW SPECIES IS PLACED IN THE GENUS TYLODELPHYS BECAUSE IT PRESENTS INDISTINCTLY BIPARTITE BODY, WELL DEVELOPED VENTRAL SUCKER AND PSEUDOSUCKERS, CONICAL POSTERIOR SEGMENT, TESTIS IN TANDEM, SYMMETRICAL, SMALL GENITAL CONE AND THE VITELLINE GLANDS DISTRIBUTED IN BOTH SEGMENTS. TYLODELPHYS ADULTA SP. NOV. IS CHARACTERIZED BY HAVING THE ANTERIOR SEGMENT DORSALLY AND VENTRALLY COVERED BY FINE SPINES UP TO THE HOLDFAST ORGAN PROXIMITY, THE VITELLINE GLANDS DISTRIBUTED FROM THE VENTRAL SUCKER AND A LARGE GENITAL PORE IN TERMINAL POSITION. TYLODELPHYS ADULTA SP. NOV. MAINLY DIFFERS FROM THE KNOWN NEOTROPICAL SPECIES T. AMERICANA AND T. ELONGATA BY THE RESTRICTED DISTRIBUTION OF THE VITELLINE GLANDS AND THE LARGER SIZE OF THE PSEUDOSUCKERS. THIS IS THE FIRST RECORD OF ADULT SPECIMENS OF THE GENUS TYLODELPHYS FROM ARGENTINA.