The 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 (Mitchill) (=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.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.