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Skeletomuscular anatomy of the male genitalia of Epimartyria (Lepidoptera: Micropterigidae)

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The skeletomuscular anatomy of the male genital segments of E. pardella is described. The anteroventrally produced segment IX ring and bilobed tergum X are attributed to the ground plan of the Sabatinca group of genera. The gonopod base bears a prominent dorsomedian process. Posterolateral sclerotizations in the anal cone wall are unusually strong, venter X plates are simple and weakly sclerotized. The phallus comprises a double-walled phallobase and a single-walled aedeagus which is divided into a dorsal and a ventral branch; the gonopore opens distally on the latter. Close-set radial folds around the gonopore are a probable micropterigid autapomorphy. Fibres of a VIII/IX dorsolongitudinal muscle sometimes insert in the gonopod base. The phallic protractor originates in the gonopod. No muscles from the segment IX ring insert in the gonopod; a similar condition is found in Paramartyria. Gonopod adduction is apparently effected by a muscle inserting on a median plate between the gonopod bases. A powerful depressor of the postgenital complex originates posterolateral by the segment IX ring. The genital musculature in Epimartyria is compared with that in Micropterix and Eriocrania, and the bearing of genital structure on the systematic placement of Epimartyria is discussed.

Affiliations: 1: Zoological Museum, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen Denmark


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