02681nas a2200157   4500008004100000022001400041245018800055210006900243260001600312520206300328100001802391700002002409700002202429700002202451856005002473       2012                        ENG d  a1937-234500aTHE DESCRIPTION AND HOST-PARASITE RELATIONSHIPS OF A NEW QUADRIGYRID SPECIES (ACANTHOCEPHALA) FROM THE PERSIAN TOOTH-CARP, APHANIUS FARSICUS (ACTINOPTREYGII: CYPRINODONTIDAE) IN IRAN.0 aDESCRIPTION AND HOSTPARASITE RELATIONSHIPS OF A NEW QUADRIGYRID   c2012 Sep 203 a<p>Abstract Acanthogyrus (Acanthosentis) barmeshoori n. sp. (Quadrigyridae) is described from the Persian tooth-carp, Aphanius farsicus (Teimori, Esmaeili and Reichenbacher, 2011) (Cyprinodontidae) in the Maharlu Lake basin, southern Iran. Aphanius farsicus is an endemic freshwater fish found in streams and springs that drain into Maharlu Lake, Shiraz, Iran. The new species is the smallest of all the 44 known species of the subgenus Acanthosentis Verma and Datta, 1929, measuring between 0.26 and 1.68 mm in length. It is further distinguished by having a short cylindrical proboscis with very long anterior hooks widely separated from very small hooks in 2 very close circles posteriorly (hook length ratio about 4:1). It is separated from 4 other species of Acanthosentis with similar proboscis armature but with less extreme diversification of hook length. The new species is also distinguished by having anterior para-receptacle structures (PRS) and a similar posterior structure like those reported in only 1 other species of Acanthosentis from Japan. Proboscis receptacle single walled with large triangular cephalic ganglion. Testes are large, pre-equatorial, and Saefftigen&#39;s pouch is prominent. Fourteen to 25 circles of spines cover the anterior 50-70% of the trunk but a few spines may be present at posterior end of trunk. This is the first species of Acanthosentis where SEM images, showing external morphological details, are provided. Of a total of 357 fish specimens examined between July, 2006 and June, 2007, 173 specimens (48.5 %) were infected with individuals of the new species. The prevalence of infection decreased with increasing fish size. The parasite was observed all year with the highest abundance and intensity in May while the prevalence was highest in February. The prevalence of acanthocephalans decreased with increasing fish size. While most worms were recovered in fish within the length range of 18-29.9 mm, one of the longest parasites (1.68 mm long) was found in fish within the range of 30-33.9 mm long.</p>
1 aAmin, Omar, M1 aGholami, Zeinab1 aAkhlaghi, Mostafa1 aHeckmann, Richard  uhttps://acanthocephala.myspecies.info/node/13