Description of a New Species of Uvitellina Witenberg, 1923 (Cyclocoelidae: Haematotrephinae), from the Black-Winged Stilt, Himantopus himantopus (Charadriiformes: Recurvirostidae) from the Ukraine
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abstract
Five specimens of a new species of Uvitellina Witenberg collected from the air sacs of a black-winged stilt, Himantopus himantopus, collected from the Kherson Region of the Ukraine, were described. Of the 9 species in the genus, Uvitellina himantopi n. sp. differs from all other species in the ratio of the width to the length of eggs (11.8 11.6-11.9 compared to a low of 12.2 in Uvitellina adephis and a high of 13.6 in Uvitellina teesae). Uvitellina himantopi n. sp. is most similar to Uvitellina iraquensis because, unlike the other 4 species in the genus with a rudimentary oral sucker (Uvitellina indica, Uvitellina kaniharensis, Uvitellina macroisophaga, and U. teesae), these 2 species have an oral sucker that is typically wider than the pharynx (11.0-11.2 oral sucker width/pharynx width compared to 10.8-10.9 in the other 4 species) and a similar cirrus sac length (370-400 long 3-4% of body length compared to 300-490 3-5%). Uvitellina himantopi n. sp. has a larger body than U. iraquensis (12,118-15,100 long compared to 7,750-10,459), wider eggs (105 maximum width compared to 88), and unlike in U. iraquensis, the vitelline fields of U. himantopi n. sp. are attenuated posteriorly at their confluence to form a conspicuous, posteriorly directed point.
