Perla
Creators: name: Teslenko, Valentina A.
name: Palatov, Dmitry M.
name: Semenchenko, Alexander A.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Perla

description: Key to Caucasian Perla species based on male penial setae patterns   
1 Sac of the penis dorsomedial bears a tongue-shaped lobe covered with a relatively wide apical brush; the spines of the brush along the lateral edges of the sac are absent (Figs. 77−79, 108−111)..............................................2  
− Sac bears a narrow apical brush (Figs. 9−10).................................................................3  
 2 Tube of the penis with constriction in the distal 1/3 before the sac; the sac is large, 1/3 wider than the tube, and covered with a loose triangular apical brush (Figs. 108−111). North Caucasus. Russia, Krasnodar Kray. Armenia, Georgia, Azerbaijan, and Turkey. Up to 2000 m. Adult presence: May–August............................... P. pallida Guérin-Méneville, 1843   
 − Tube of the penis without constriction; the sac width is the same as the tube width; ventrally, the sac is deeply depressed (Figs. 77−79). Russia, Krasnodar Kray the Black Sea coast of the Caucasus from Tuapse to Sochi. Up to 200 m. Adult presence: July............................................................................ Perla schapsugica sp. nov .   
3 Sac is membranous, without tiny setae (Figs. 34−35)......................................................... 4  
− Sac is membranous and covered with tiny setae (Figs. 139−140, B, D).............................................5  
 4 Sac bears a narrow apical brush; additional ventral brush is absent (Figs. 33−35). Caucasus. Russia, North Ossetia-Alania. Iran, Alborz Mountains. 1770−1900 m. Adult presence: June−July.................................. Р. persica Zwick, 1975   
 − Sac bears a narrow apical brush and an additional small ventral brush (Figs. 10, C). North Caucasus. Russia: Adygea, KarachayCherkessia, North Ossetia-Alania, Krasnodar Kray. Abkhazia. Georgia. Adult presence: late May–August...................................................................................... P. caucasica Guérin-Méneville, 1843   
 5 Sac covered with tufts of tiny setae associated with patches and arranged in concentric lines, following the shape of the lobes (Figs. 139−140, B, D). North Caucasus. Russia, Krasnodar Kray. Up to 1800 m. Adult presence: June.................................................................................................... Perla palatovi sp. nov .   
 − Sac covered with dense, tiny setae spaced relatively evenly (Figs. 58, D). Armenia, Azerbaijan. 1400–1850 m. Adult presence: latter half of May−first half of July............................................... P. kiritshenkoi Zhiltzova, 1961
description: Published as part of Teslenko, Valentina A., Palatov, Dmitry M. & Semenchenko, Alexander A., 2024, Overview of the Caucasian Perla Geoffroy, 1762 (Plecoptera: Perlidae) based on morphological and molecular data with description of two new species, pp. 1-56 in Zootaxa 5507 (1) on page 47, DOI: 10.11646/zootaxa.5507.1.1, http://zenodo.org/record/13747718