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MORPHOLOGICAL VARIATIONS, LIFE STAGES AND EMENDED DESCRIPTION OF HEMICYCLIOPHORA ZUCKERMANI BRZESKI (NEMATODA, CRICONEMATIDAE) 1) BY M. W. BRZESKI 2) AND B. M. ZUCKERMAN Cranberry Experiment Station, University of Massachusetts, East Wareham, Massachusetts, U.S.A. Hemicycliophora zuckermani, a species which normally has a convex-conoid tail, may have a rounded tail or a tail shape of some intermediate form. The first stage larva occurs within the egg, as does the first molt. Second stage larvae are differentiated from third stage by having a longer esophageal region in relation to total body length. Third stage larvae have crenate incisures in the lateral fields and no transverse lines, whereas the lateral fields in fourth stage larvae lack incisures and transverse junctions are present in the form of thin lines. The male of the species is described. Males are extremely rare. These studies illustrate the need for a revision of the current species concepts in the genus Hemicycliophora. In a key to the species of Hemicycliophora, Thorne ( 195 5 ) used tail shape as a primary character for differentiating species. Among several thousand Hemicyclio- phora females from one location on the experimental cranberry bog, East Wareham, Mass., though most had convex-conoid tails with
Nematologica – Brill
Published: Jan 1, 1965
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