Plusiocampa ( Stygiocampa ) bureschi Silvestri, 1931

Sendra, Alberto, Stoev, Pavel & Selfa, Jesús, 2025, Cave-adapted Plusiocampinae (Diplura, Campodeidae) from the eastern part of the Balkan Peninsula, Deutsche Entomologische Zeitschrift 72 (2), pp. 317-340 : 317-340

publication ID	https://doi.org/10.3897/dez.72.162647
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DOI	https://doi.org/10.5281/zenodo.17532353
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scientific name	Plusiocampa ( Stygiocampa ) bureschi Silvestri, 1931
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Plusiocampa ( Stygiocampa) bureschi Silvestri, 1931

Figs 13 View Figure 13 , 14 View Figure 14 , 15 View Figure 15 , 16 View Figure 16 , 17 View Figure 17 , 21 View Figure 21

Plusiocampa bureschi Silvestri, 1931: 100, figs iii – v. Type locality: Temnata dupka, Lakatnik Railway Station, Bulgaria.

Plusiocampa ( Stygiocampa) rauseri Rusek, 1965: 94, figs 18–24.

Plusiocampa ( Stygiocampa) bureschi : Beron, 2015: 92.

New material examined.

Bulgaria: Vrachanska Planina Mts • 2 ex., Svoge Ditstrict, Lakatnik Railway Station, cave Razhishkata peshtera ( type locality of P. rauseri ), 28 Feb. 1993, leg. B. Petrov • 15 ex., same locality, 22 Feb. 1995, leg. B. Petrov • 3 ex., Svoge Ditstrict, Lakatnik Railway Station, cave Kozarskata , 21 Mar. 1993, leg. P. Stoev • 3 ex., same locality, 03 Nov. 2010, leg. B. Petrov, N. Toshkova • 1 ex., Svoge Ditstrict, Lakatnik Railway Station, cave Svinskata dupka, 450 m, alt., 19 Apr. 2006, leg. B. Petrov • 1 ex., same locality, 03 Nov. 2010, leg. B. Petrov, N. Toshkova • 3 ex., Mezdra District, Cherepish Railway Station, cave Novata pestera, 43.09811 ° N, 23.59615 ° E, 562 m alt., 01 Jun. 2012, leg. N. Toshkova GoogleMaps • 3 ex., Mezdra District, Cherepish Railway Station, cave Serapinovata peshtera, 15 Apr. 1993, leg. P. Stoev • 1 ex., Mezdra District, Cherepish Railway Station, cave Ezeroto , 03 Feb. 2008, leg. Y. Makulev, Zh. Zhechev • 4 ex., Sofia District, village Iskrets, cave Tsarkvishte , 14 Nov. 1993, leg. B. Petrov • 1 ex., Sofia District, village Breze, cave Yamata , 1000 m alt., 20 Jun. 1993, leg. B. Petrov • 1 female, Sofia District, village Tserovo, cave Vodnata peshtera, 09 May. 1982, leg. P. Beron • 2 ex., Vratsa District, village Chelopek, cave Dedova dupka, alt. 885 m alt., 23 Sep. 2017, leg. K. Lakovski, O. Genova • 1 male, 1 female, same locality, and collectors, 03 Nov. 2017 .

Diagnosis.

( Silvestri 1931; Condé 1956, 1959; Condé and Bareth 1996; Bareth and Condé 2001): Epicuticle with a surface in strips in anastomosis unions visible at high magnifications, not visible in optical microscope (Fig. 14 a View Figure 14 ). Antennae with 39–54 antennomeres elongated with up to 32 thin gouge sensilla on medial antennomers, covered by up to 5 whorls of macrosetae (Fig. 13 c, d View Figure 13 ); base of the trichobothria elevated overpassing the surface (Fig. 13 b View Figure 13 ); seven to nine complex olfactory chemoreceptors in cupuliform organ, each with a prominent central protrusion surrounding a single fold (Fig. 13 a View Figure 13 ). Labium subtriangular with the typical latero-anterior bacilliform sensillum in addition to a field of about 120 thin gustative glandular sensilla (Fig. 14 b View Figure 14 ). Pronotum with 1 + 1 ma, 2 + 2 la, 2 + 2 lp macrosetae; mesonotum with 1 + 1 ma, 1 + 1 lp macrosetae; metanotum without macrosetae; long, barbed notal macrosetae; abundant notal clothing setae. No ventral tibial macrosetae; slightly unequal claws (1.1–1.3: ratio posterior / anterior) with large and narrow lateral crests, posterior claw with a small backward overhang (Fig. 15 a – e View Figure 15 ); calcars all covert with numerous long barbs (Fig. 15 f View Figure 15 ). Urotergite VII with 2 + 2 post macrosetae; urotergites VIII with 4 + 4 post macrosetae; abdominal segment IX with 6 + 6–7 + 7 post macrosetae; urosternite I with 7 + 7, urosternites II – VII with 5 + 5, urosternite VIII with 2 + 2 macrosetae (Fig. 16 c – f View Figure 16 ); stylus setae all covered with numerous long barbs (Fig. 17 a, b View Figure 17 ); typical exertile vesicles (Fig. 17 c, d View Figure 17 ). Male without glandular g 1 setae, long subcylindrical slightly enlarged appendages with glandular a 1 setae; female with very long subcylindrical appendages with glandular a 1 setae (Fig. 16 a, b View Figure 16 ). Spermatozoid fascicles 50 µm in diameter, 25 µm wide; wheels with 3 ½ turns of 300–350 µm and 5.6 µm diameter filament.

Habitat and distribution.

The species seems highly adapted to the cave environment, and until now, it has been known from 11 caves in the area surrounding Tserovo and Lakatnik railway stations ( Beron 2015). With the present study, its range has expanded by approximately 14 km (in a straight line) to the west-southwest, where it has been recorded in caves near the villages of Breze and Iskrets, and by about 18 km to the north-northeast, where it has been found in three caves in the area of Cherepish railway station and the village of Chelopек. All recorded locations are within the karst region of the Vratsa Mountain, one of the most cave- and cave-organism-rich areas in the country (Fig. 21 View Figure 21 ).