Acanthostomum macroclemidis n. sp. is described from specimens found in the intestine of an alligator snapping turtle Macroclemys temmincki from southern Mississippi. The most important diagnostic features of the new species are the general shape and proportions of the body, the position of the pharynx (relative length of the prepharynx and esophagus), the egg size, the relative length and position of the vitelline fields, and the number, shape, and size of the circumoral spines. The new species has a very elongated body (length–width ratio, 8.9–13.0:1), 26 circumoral spines, which are almost oval in shape, a long prepharynx and a very short (shorter than the pharynx) esophagus, a seminal receptacle situated between the ovary and the anterior testis, a uterus not extending posterior to the anterior margin of the ovary, a long-stemmed and short-armed excretory vesicle, and 2 anal openings. Some features of the external morphology, such as the suckers, circumoral spines, sensory papillae, tegumental spines, and morphology of the posterior end, are examined using scanning electron microscopy. A diagnosis differentiating A. macroclemidis n. sp. from some other acanthostomine digeneans is provided. Acanthostomum macroclemidis n. sp. is the first digenean reported from an alligator snapping turtle and represents the northernmost record of an acanthostomine from turtles.
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February 2003
SYSTEMATICS-PHYLOGENETICS|
February 01 2003
ACANTHOSTOMUM MACROCLEMIDIS N. SP. (DIGENEA: CRYPTOGONIMIDAE: ACANTHOSTOMINAE) FROM THE ALLIGATOR SNAPPING TURTLE, MACROCLEMYS TEMMINCKI
Vasyl V. Tkach;
Vasyl V. Tkach
Institute of Zoology, Ukrainian National Academy of Sciences, 15 B Khmelnitsky Street, Kiev 01601, Ukraine, and Institute of Parasitology, Polish Academy of Sciences, 51/55 Twarda Street, 00-818 Warsaw, Poland. sdsnyder@mail.unomaha.edu
† Present address: Department of Biology, University of North Dakota, Grand Forks, North Dakota 58202
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Scott D. Snyder
Scott D. Snyder
Institute of Zoology, Ukrainian National Academy of Sciences, 15 B Khmelnitsky Street, Kiev 01601, Ukraine, and Institute of Parasitology, Polish Academy of Sciences, 51/55 Twarda Street, 00-818 Warsaw, Poland. sdsnyder@mail.unomaha.edu
* To whom correspondence should be addressed. Department of Biology, University of Nebraska at Omaha, Omaha, Nebraska 68182
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J Parasitol (2003) 89 (1): 159–167.
Citation
Vasyl V. Tkach, Scott D. Snyder; ACANTHOSTOMUM MACROCLEMIDIS N. SP. (DIGENEA: CRYPTOGONIMIDAE: ACANTHOSTOMINAE) FROM THE ALLIGATOR SNAPPING TURTLE, MACROCLEMYS TEMMINCKI. J Parasitol 1 February 2003; 89 (1): 159–167. doi: https://doi.org/10.1645/0022-3395(2003)089[0159:AMNSDC]2.0.CO;2
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