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A NOTE ON THE MORPHOLOGICAL VARIABILITY OF ORCONECTES KINDERHOOKENSIS (DECAPODA: CAMBARIDAE) FROM THE HUDSON RIVER SYSTEM IN NEW YORK

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ABSTRACT Orconecteskinderhookensis Fitzpatrick and Pickett, a recently described crayfish from the Hudson River system in New York, is distinguished from its closest relative, O. propinquus(Girard), chiefly by possession of a shorter mesial process relative to the central projection on the first pleopod of the first form male. Non-overlap of ratios of mesial process length to central projection length between the two populations led Fitzpatrick and Pickett to consider the two populations as reproductively isolated, distinct species. Subsequent collecting in the Hudson River system has revealed specimens showing morphological intergradation between the two species. The kinderhookensis morphological trait is usually found in smaller males. It is suggested that a shorter mesial process in O. kinderhookensis is due to differential growth during development. Therefore, the recognition of O. kinderhookensis as a distinct species, when using mesial process length to central projection length ratios, becomes questionable.

Affiliations: 1: Museum of Zoology, University of Massachusetts, Amherst, Massachusetts 01003.

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/content/journals/10.1163/1937240x81x00465
1981-01-01
2016-12-11

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