First morphological and molecular identification of the cercaria of Stomylotrema vicarium from the endemic apple snail Pomacea americanista

The adult fluke Stomylotrema vicarium (Stomylotrematidae, Microphalloidea) was described for the first time in Theristicus caerulescens in 1901, but the complete life cycle has remained unknown to date. Here, we found a stomylotrematid trematode in the digestive gland of the endemic apple snail Poma...

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Published inParasitology Vol. 149; no. 1; pp. 95 - 104
Main Authors Dellagnola, Federico A., Campoy-Diaz, Alejandra D., Vega, Israel A.
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 01.01.2022
Subjects
Animals
Annealing
Cercaria
Cercaria - genetics
Connective tissues
Digestive glands
Larvae
Life Cycle Stages
Life cycles
Metacercariae
Microscopy
Mollusks
Morphology
Parasites
Phylogenetics
Phylogeny
Pomacea
Respiration
rRNA 28S
Snails
Stomglotrema vicarium
Trees
Trematoda
United States > US
Schulenburg Texas
Argentina
Apple snails
rRNA 28S
ITS1
microphalloidean trematodes
digestive gland
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Summary:The adult fluke Stomylotrema vicarium (Stomylotrematidae, Microphalloidea) was described for the first time in Theristicus caerulescens in 1901, but the complete life cycle has remained unknown to date. Here, we found a stomylotrematid trematode in the digestive gland of the endemic apple snail Pomacea americanista. The digestive gland's tubuloacini were compressed by the trematode larvae placed on connective tissues and haemocoel spaces. Non-virgulate, stylet-bearing cercariae showed three pairs of penetration glands with a body, oral sucker and stylet morphometrically similar to those of stylet-bearing, unencysted young metacercariae of S. vicarium found in the aquatic coleopteran Megadytes glaucus, and at a lesser extent with cercariae of S. gratiosus found in the apple snail Pomacea maculata. The larvae molecular phylogeny was inferred using the markers rRNA 28S and ITS1, being these sequences grouped with the sequences of S. vicarium obtained from adult flukes. Together, these findings indicate that the life cycle of S. vicarium begins in P. americanista, thus supporting the hypothesis that the ampullariid snails act as a first intermediate host.
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ISSN:0031-1820
1469-8161
DOI:10.1017/S003118202100158X