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Description of the Egg of Ochlerotatus japonicus japonicus (Diptera: Culicidae) Using Variable Pressure Scanning Electron Microscopy

Andrew D. Haddow,J. Moulton,R. Gerhardt,L. Mccuiston,Carl J. Jones

Published 2009 in Journal of medical entomology

ABSTRACT

ABSTRACT The egg of Ochlerotatus japonicus japonicus (Theobald) is described with the aid of variable pressure scanning electron micrographs. The egg is black, cigar shaped, and tapers ventrally. The length is ≈591 µm and the width is ≈172 µm. The outer chorionic cells are irregular in shape, either hexagonal or pentagonal, and decrease in size toward the anterior and posterior poles. Ventral tubercles typically range from three to six and contact the chorionic reticulum. Dorsal tubercles contain two large tubercles with small oval-shaped tubercles grouped around them. A large thread-shaped tubercle extends from this grouping either as a single tubercle or as a series of connected tubercles. The micropylar collar is low and discontinuous and is seldom complete. This description will aid researchers in the identification of this invasive vector species.

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