Helcystogramma trijunctum, Vinculum

Li, H. H. & Zhen, H., 2011, Review of the genus Helcystogramma Zeller (Lepidoptera: Gelechiidae: Dichomeridinae) from China, Journal of Natural History 45 (17 - 18), pp. 1035-1087: 1071

publication ID

http://doi.org/ 10.1080/00222933.2011.552798



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scientific name

Helcystogramma trijunctum


The trijunctum   group

This group is defined by the following characters: the ocellus absent, the antenna ciliate, the labial palpus with ( Figure 4C View Figure 4 ) or without ( Figure 4D View Figure 4 ) long scales on dorsal surface, the third segment shorter than second, the forewing usually with scale tufts at about middle and end of cell as well as at fold; the eighth tergite nearly straight anteriorly, the uncus narrowed from base to apex, its anterior margin concave triangularly, the gnathos blunt apically, the vinculum with distal part of lobes directed obliquely inward, usually thumb-shaped and blunt apically, the saccus broad, often bluntly rounded anteriorly ( Figure 16E View Figure 16 ), the aedeagus nearly equal to or slightly shorter than valva, narrow and with clusters of spines distally in the male genitalia; the eighth tergite straight posteriorly, the antrum spined, the ductus bursae sclerotized distally, the corpus bursae densely spined on inner surface, usually protruding posteriorly on one side, and the ductus seminalis arising from apex of protrusion in the female genitalia.

This species group occurs in China only, including eight species: H. hassenzanensis Park et Hodges, 1995   , H. trijunctum ( Meyrick, 1934)   , H. albilepidotum   sp. nov., H. angustum   sp. nov., H. flavistictum   sp. nov., H. furvimaculare   sp. nov., H. imagitrijunctum   sp. nov., and H. rectangulum   sp. nov. They belong to the Oriental Region, distributed mainly in the middle and southeast parts, ranging from south of Qinling Mountains to Taiwan ( Figure 3 View Figure 3 ).