NDLI: Acanthocephalus amini n. sp. (Acanthocephala: Echinorhynchidae) from the freshwater fish Cichlasoma urophthalmus (Günther) (Cichlidae) in Mexico

Content Provider	Springer Nature Link
Author	Salgado Maldonado, Guillermo velo Turcotte, María Teresa
Copyright Year	2009
Abstract	Acanthocephalus amini n. sp. (Palaeacanthocephala: Echinorhynchidae) is described from the intestine of Cichlasoma urophthalmus (Günther) (Pisces: Cichlidae) collected in the Río Champotón, a river in Campeche State, Mexico. It is the fourth species of Acanthocephalus Koelreuther, 1771 described from North American freshwater fishes, although two other species are known from South America. The new species is distinguished from other members of Acanthocephalus by features of its trunk, which is small, clavate, slightly expanded medially and bluntly pointed posteriorly. It is further distinguished by having a cylindrical proboscis armed with 13–14 longitudinal rows of 11–12 stout hooks; the apical and medial proboscis hooks are almost uniform in size and shape, decreasing in size towards the base; the posteriormost hooks are smaller, straighter and more slender than the anterior and middle hooks; and the lateral rows of hooks are more widely spaced, forming a conspicuous longitudinal area devoid of hooks. Furthermore, the lemnisci are saccate and shorter than the proboscis receptacle; and the neck is very short with a thick collar of trunk tegument, which encircles the base of proboscis. In males, the testes are in the middle third of trunk, diagonal, spherical and small relative to the body size, and there are six clavate cement glands. In females, the uterus forms a conspicuous, elongate, cylindrical egg reservoir. The new species is most similar to A. alabamensis Amin & Williams, 1983, but can be distinguished by its swollen, clavate trunk, the largest proboscis hooks being present apically and medially, smaller testes, a shorter male reproductive system relative to body size and females with a prominent uterus. They have different hosts and geographical distribution. The new species can be differentiated from Brasacanthus sphoeroides Thatcher, 2001, a similar species in a monotypic echinorhynchid genus, because the latter is larger, has smaller proboscis hooks and its lemnisci are longer than the receptacle.
Starting Page	193
Ending Page	198
Page Count	6
File Format	PDF
ISSN	01655752
Journal	Systematic Parasitology
Volume Number	73
Issue Number	3
e-ISSN	15735192
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-05-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Life Sciences Animal Ecology Agriculture Zoology Animal Anatomy Morphology Histology Animal Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Parasitology

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