A new species of Maritrema (Trematoda: Microphallidae) parasitizing the Baird?s sandpiper Calidris bairdii, and comments about diversity of Microphallidae in two Nearctic Shorebirds at Patagonian sites in Argentina

CAPASSO S; D'AMICO VL; DIAZ JI

ACTA TROPICA

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2018

0001-706X

Birds are hosts of a wide diversity of trematodes. Between them, the Microphallidae is a common family with a cosmopolitan distribution. Nevertheless, only 10 Maritrema species have been recorded previously in South America. The aim of the present paper is to describe a new species of Maritrema parasitizing the Nearctic Baird?s sandpiper, Calidris bairdii in its wintering areas in Patagonia, Argentina. We also analyze and compare the microphallid diversity in two host species. We collected 44 C. bairdii and 50 C. fuscicollis in search of helminths. Trematodes were found only in C. bairdii. A total of 694 trematodes belonging to 4 microphallid species were found parasitizing the intestine and caeca. Four microphallid species were found: Maritrema formicae, Odhneria odhneri, Levinseniella cruzi and Maritrema pichi n. sp. M. formicae showed the highest prevalence, while M. pichi n. sp. was the species with the highest mean intensity and mean abundance. The new species M. pichi n. sp. differs from congeners by the position of the ventral sucker that is included within the vitellarium ring, the ovary is anterior to the ventral sucker, and the testes are lateral to it. We discuss the parasitological results in relation with the biological and ecological characteristics of both different host species.