Perlomyia excavata Sivec &amp; Stark 2012, sp. n.
Creators: name: Sivec, Ignac
name: Stark, Bill P.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Leuctridae
Perlomyia
Perlomyia excavata

description: <i>Perlomyia excavata</i> sp. n. (Figs. 5-8) <b>Material examined.</b> Holotype &amp;male;, paratypes 4&amp;male;, <b>Taiwan:</b> Kaohsiung County, E Tientzu, 2400 m, 23°15’24’’N, 120°54’51’’E, 29 March1996, I. Sivec, B. Horvat, (PMSL). Additional paratypes: <b>Taiwan:</b> Hualien County, Tzuen, Taroko National Park, 1890 m, 24°11’35’’N, 121°23’43’’E, 13 April 1996, I. Sivec, B. Horvat, 1&amp;female; (PMSL). Kaohsiung County, E Tientzu, 2450 m, 23°15’15’’N, 120°55’52’’E, 30 March 1996, I. Sivec, B. Horvat, 2&amp;male;, 2&amp;female; (PMSL); E Tientzu, 2450- 2500 m, 23°15’25’’N, 120°54’42’’E, 23 October 1996, I. Sivec, 4&amp;male;, 1&amp;female; (PMSL), 2&amp;male;, 1&amp;female; (BPS); Hsinan shan, 2200 m, 23°04’24’’N, 120°50’28’’E, 31 March 1996, I. Sivec, B. Horvat, 1&amp;female; (PMSL). Taichung County, Wulin, Sheipa National Park, 1820 m, 24°22’56’’N, 121°18’43’’E, 28 October1996, I. Sivec, 2&amp;male;, 2&amp;female; (PMSL). Taitung County, W Hsiangyang, 2580 m, 23°15’48’’N, 120°59’27’’E, 30 March 1996, I. Sivec, B. Horvat, 1&amp;female; (PMSL). <b>Adult habitus.</b> General color dark brown to black, typical of genus. <b>Male.</b> Forewing length 7 mm. Epiproct long, slender in dorsal aspect and hook shaped in lateral aspect (Figs. 5, 7). Tergum 9 notched along posterior margin, forming a prominent U-shaped cleft which extends nearly to the anterior margin of the segment; posterolateral margins of notch produced into slender finger-shaped processes. Small knobs absent from tergum 10. Cerci bearing a prominent basal lobe with rounded distal margin visible in dorsal aspect, and a small subapical spine. Paraprocts fused into a broad, thick process bearing a slender, retractable, sclerotized rod (Fig. 7). Apex of sternum 9 produced into a triangular, upwardly curved structure (Figs. 6- 7). Vesicle longer than wide (Fig. 6). <b>Female.</b> Forewing length 8 mm. Sternum 7 produced into a rounded plate which overlaps the base of sternum 8 (Fig. 8). Mesal, rectangular sclerites of sternum 8 narrowly divided by membrane; mesal sclerites extend slightly beyond base of sternum 9; lateral wing-like sclerites somewhat foot shaped and attached to anterolateral margins of mesal sclerites. <b>Larva.</b> Undescribed. <b>Etymology.</b> The species name refers to the U-shaped, excavated area of tergum 9 of the male. <b>Diagnosis.</b> This is the only known <i>Perlomyia</i> species in which the male 9 th tergum exhibits a U-shaped cleft, similar to that found in males of the eastern Nearctic genus <i>Zealeuctra</i> (Ricker &amp; Ross 1969). A similar structure also occurs on tergum 7 for <i>Leuctra fusca</i> (Linnaeus) (Zhiltzova 2003a). As noted above the female is similar to <i>P. angulata</i> among Taiwanese species, but is distinguished by the location of the attachment points between sclerites on sternum 8.
description: Published as part of <i>Sivec, Ignac &amp; Stark, Bill P., 2012, The Genus Perlomyia Banks In Taiwan (Plecoptera: Leuctridae), pp. 119-124 in Illiesia 8 (11)</i> on page 122, DOI: 10.5281/zenodo.4760611
description: {"references": ["Ricker, W. E. &amp; H. H. Ross. 1969. The genus Zealeuctra and its position in the family Leuctridae (Plecoptera, Insecta). Canadian Journal of Zoology, 47: 1113 - 1127.", "Zhiltzova, L. A. 2003 a. The Leuctridae (Plecoptera) of Russia and adjacent territories (within the limits of the former USSR). Pp. 239 - 244. In Gaino, E. [ed.]. Research update on Ephemeroptera &amp; Plecoptera. University of Perugia, Perugia, Italy. 488 pp."]}