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The Anatomy and Histology of the Male Reproductive System of the Legionary Ant, Neivamyrmex harrisi (Haldeman) (Hymenoptera: Formicidae)

James Forbes and Dominic Do-Van-Quy
Journal of the New York Entomological Society
Vol. 73, No. 2 (Jun., 1965), pp. 95-111
Stable URL: http://www.jstor.org/stable/25005955
Page Count: 17
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Anatomy and Histology of the Male Reproductive System of the Legionary Ant, Neivamyrmex harrisi (Haldeman) (Hymenoptera: Formicidae)
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Abstract

This paper presents the first description of the anatomy and histology of the male reproductive system for this doryline ant. Anatomical descriptions of the eighth and ninth sterna are included. The male system consists of the testes, the vasa deferentia, the accessory glands and ducts, the bound accessory gland duct, the ejaculatory duct, and the genitalia. The testes, situated in the third gastral segment, lie between the proximal arms of the U-shaped vasa deferentia and are covered with a single capsule. Each testis has about 22-25 tubular follicles. The vasa deferentia are packed with spermatozoa, and a granular mass fills their posterior ends. The coiled acessory glands lie on either side of the fourth gastral segment, and they contain a dense, homogeneous, basophilic secretion. Their ducts meet medially and become surrounded with circular muscle to form the bound accessory gland duct; two lumina are present throughout the length of the bound accessory gland duct. At the posterior end of this duct, the two lumina unite into one to form the ejaculatory duct in which a sclerotized wedge is located. The position of the wedge in the duct and the unicellular glands at the posterior end of the duct are described. The ejaculatory duct opens on the dorsal, posterior region of the aedeagal bladder, which empties between the inner valves of the genitalia. The aedeagal bladder contains a granular, basophilic secretion. Three pairs of valves and a basal ring constitute the genitalia. Sperm gutters are present on the inner valves. Comparisons are made with the male systems for two dorylines previously reported, Dorylus labiatus and Eciton hamatum, which place Neivamyrmex anatomically closer to Eciton than to Dorylus.

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