The first modern morphological description of Cercaria pennata and molecular evidence of its synonymy with Pronoprymna ventricosa in the Black Sea

Abstract

During the parasitological examination of molluscs Abra segmentum obtained from the Black Sea basin, parthenitae belonging to the family Faustulidae were found. The cercariae were obtained by natural emergence and were studied using differential interference contrast microscopy and scanning electron microscopy. Specimens resemble Cercaria pennata ex Tapes rugatus which was described from the Sevastopol area, in the shape and length of the body, tail length, location and shape of internal organs, suckers, pharynx, testicular rudiments, and the number and position of longitudinal lamellae on the tail finlets. To date, there are only limited descriptions of the parthenitae of C. pennata without detailed measurements, thus the taxonomic position of the individuals studied needs thorough revision and molecular verification. According to the molecular analyses, C. pennata was identical to that of published sequences of Pronoprymna ventricosa.

Morphological and molecular data on Pseudozoogonoides ugui Shimazu, 1974 (Digenea: Microphalloidea: Zoogonidae) ex Pseudaspius hakonensis (Günther, 1877) and taxonomic problems in Zoogoninae genera

“…Results of phylogenetic analysis based on the 28S rDNA sequence data set repeated the polyphyly for the family Faustulidae s. lato , as revealed in the previous studies (Sun et al , 2014; Cutmore et al , 2018; Sokolov et al , 2021b; Belousova et al , 2023). The polyphyly was expressed in the existing two distant clades of this family: the ‘microphalloid’ clade, which is closer to Microphalloidea, and the ‘gymnophalloid’ clade, which is closer to Gymnophalloidea.…”