03075nas a2200325   4500008004100000020002000041245026000061210006900321260001200390300001400402490000700416520188700423653001902310653002002329653001702349653002002366653001302386653001602399653002502415653002402440653002202464653004302486653001102529653002702540653001002567653002102577100001502598700001902613856011702632       2009                        eng d  a15252647 (ISSN)00aDescription of Neoechinorhynchus (Neoechinorhynchus) buckneri n. sp. (Acanthocephala: Neoechinorhynchidae) from the Blacktail Redhorse Moxostoma poecilurum (Catostomidae) in the Tchoutacabouffa River, Mississippi, U.S.A., with a key to species of Neoechin0 aDescription of Neoechinorhynchus Neoechinorhynchus buckneri n sp  c2009///  a154 - 1610 v763 aNeoechinorhynchus (Neoechinorhynchus) buckneri n. sp. is described from the blacktail redhorse Moxostoma poecilurum (Jordon) (Catostomidae) in the Tchoutacabouffa River, Mississippi, U.S.A. It is the sixteenth species of Neoechinorhynchus Stiles and Hassall, 1905, with unequal lemnisci, and the sixth in a subgroup with dorsal body wall markedly thicker than ventral. Another species of the latter group, Neoechinorhynchus (Hebesoma) carinalus Buckner and Buckner, 1993, was also collected in the Tchoutacabuffa River, Mississippi, and tributaries of 2 other streams in Louisiana, U.S.A., from the sharpfin chubsucker, Erimyzon tenuis (Agassiz). All 3 streams from the 2 adjacent states discharge into the Gulf of Mexico. Most of these 16 species occur in North American freshwater fishes. Females of N. buckneri n. sp. are twice as long as males and their dorsal body wall is 4 times as thick as the ventral body wall, compared with 2.5 times as thick in males. All other shared structures are of similar size in both sexes. Proboscis armature is unremarkable, with hook circles being evenly spaced and hook sizes in each circle of similar size, but slightly decreasing in size posteriorly from 38-42 μm long anteriorly to 33-34 μm long at middle to 25 μm long posteriorly in both sexes. It is further distinguished from the group of 16 other species of Neoechinorhynchus with unequal lemnisci and body wall thickness, by having moderately but not extremely diverse leminisci, noncontiguous testes, and posterior testis distant from cement gland. A key distinguishing N. buckneri n. sp. from other species with different dorsoventral body wall thickness is provided. Scanning electron microscopy studies show the porous cuticular surface and the curling of the posterior end of breeding females caused by the contraction of the paired paravaginal muscles, among other features.10aAcanthocephala10aAcanthocephalus10aCatostomidae10aErimyzon tenuis10aHebesoma10aMississippi10aMoxostoma poecilurum10aNeoechinorhynchidae10aNeoechinorhynchus10aNeoechinorhynchus (N.) buckneri n. sp.10aPisces10aThick dorsal body wall10aU.S.A10aUnequal lemnisci1 aAmin, O.M.1 aHeckmann, R.A.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-69849112369&partnerID=40&md5=d45564bc19a5468df2861f79c264e37602772nas a2200325   4500008004100000020002000041245020600061210006900267260001200336300001200348490000700360520164900367653002002016653001802036653001702054653001302071653001602084653001302100653001302113653002402126653003102150653004802181653001302229653001802242653001902260653001702279100001502296700001802311856011702329       2009                        eng d  a15252647 (ISSN)00aRedescription of Neoechinorhynchus tenellus (Acanthocephala: Neoechinorhynchidae) from esox lucius (Esocidae) and Sander vitreus (Percidae), among other Pereid and Centrarchid fish, in Michigan, U.S.A.0 aRedescription of Neoechinorhynchus tenellus Acanthocephala Neoec  c2009///  a44 - 500 v763 aThe only 2 published taxonomic accounts of Neoechinorhynchus tenellus are those of Van Cleave (1913) and Van Cleave (1919) from Esox lucius Linnaeus and Sander vitreus (Mitchili) (=Stizostedion vitreus (Mitchill)). While Van Cleave's original description is adequate to identify N. tenellus, his description of proboscis armature, lemnisci, reproductive system in both sexes, and eggs was either not complete or in error. We studied the original type material and found their present state to be of little use for elucidating characters that were not already illustrated and described by Van Cleave. For that reason we studied newly collected, conspecific specimens to better document key morphological features of this species. Our description of the Michigan material from the same 2 fish species was compared with the original description and with Van Cleave's cotypes (designated syntypes). Our revised description includes the following: (1) trunk of males and females is widest in anterior third tapering gradually at both ends. (2) Lateral anterior hooks are markedly larger than and set more posterior to the other 4 hooks of the same circle. Middle hooks not in perfect circle but alternate. (3) Middle and posterior hooks with discoidal bases. (4) Lemnisci are subequal. (5) Eggs have distinct polar prolongation of fertilization membrane, which places the species in the subgenus Hebesoma Van Cleave, 1928. New observations address sexual dimorphism, the larger size of specimens from S. vitreus than from E. lucius, the apical organ, giant nuclei, sensory pits on the proboscis, and details of the reproductive system in both sexes.10aAcanthocephalus10aCentrarchidae10aDistribution10aEsocidae10aEsox lucius10aHebesoma10aMichigan10aNeoechinorhynchidae10aNeoechinorhynchus tenellus10aNeoechinorhynchus tenellus (Acanthocephala)10aPercidae10aRedescription10aSander vitreus10aStizostedion1 aAmin, O.M.1 aMuzzall, P.M.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-60849131251&partnerID=40&md5=1e5ab3b799d11586a76b60cc8eb4da04