P O L I S H J O U R N A L OF ENTOMOLOG Y. Chelidurella guentheri GALVAGNI, 1994 (Dermaptera: Forficulidae) an overlooked earwig species in Poland

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1 P O L I S H J O U R N A L OF ENTOMOLOG Y P O L S K I E P I S M O E N T O M O L O G I C Z N E VOL. 80: Gdynia 30 September 2011 DOI: /v Chelidurella guentheri GALVAGNI, 1994 (Dermaptera: Forficulidae) an overlooked earwig species in Poland RADOMIR JASKUŁA 1, AGNIESZKA SOSZYŃSKA-MAJ 2, JACEK HIKISZ 3 Department of Invertebrate Zoology and Hydrobiology, University of Łódź, Banacha 12/16, Łódź, Poland, 1 radekj@biol.uni.lodz.pl; 2 agasosz@biol.uni.lodz.pl; 3 jacekhikisz@smrw.lodz.pl ABSTRACT. Chelidurella guentheri GALVAGNI, 1994 (Dermaptera) is reported from Poland for the first time. As a result the Polish checklist contains seven dermapteran species. KEY WORDS: Dermaptera, Chelidurella, Poland, checklist. INTRODUCTION Six species of earwigs classified in the families Spongiphoridae (=Labiidae), Labiduridae, and Forficulidae have been reported from Poland (LIANA 2007). Despite the distribution of Dermaptera species in this country, described in detail by BAZYLUK (1976), no in-depth studies have been carried out on this group since his Catalogue was published. More recent faunistic data on Polish earwigs have usually been published as short notes or included in more general papers (e.g. BEDNARZ 1988, KOČÁREK 2000, GRABOWSKI 2009). According to the literature the systematic status of Polish Dermaptera is quite clear, except for the genus Chelidurella, which was recently revised by CAPRA (1982), VIGNA TAGLIANI (1993) and GALVAGNI (1994, 1995, 1996, 1997). As a result of these studies a complex of Chelidurella acanthopygia-like species was reported as occurring in Europe, and some new species have been described. Two of these morphologically similar species were reported from central Europe: the previously known C. acanthopygia (GÉNE, 1832) and the recently

2 424 Polish Journal of Entomology 80 (3) described C. guentheri GALVAGNI, The first one was known from Poland before the revisions, whereas the second could possibly occur in the country, as it has been found in the Czech Republic and Germany (KOČÁREK et al. 2005). Since no specimens of Polish Chelidurella have yet been studied and the revisions have been overlooked by Polish entomologists, we decided to examine the earwigs we collected in central Poland in order to check for the potential presence of the species in this region. STUDY SITES The material was collected in seven localities in the Łódź district, central Poland. According to the physiographic division of Poland by KONDRACKI (2000), the study sites are located in the Łódź Hills (Wzniesienia Łódzkie) (KUROWSKI 1998, RĄKOWSKI et al. 2006). Five of the study sites are located in the Wzniesienia Łódzkie Landscape Park: the Struga Dobieszkowska Nature Reserve [UTM: DC04], a natural part of the Młynówka river valley, with springs, supporting Circaeo-Alnetum and Tilio-Carpinetum; the Dobieszków Range [UTM: DC04] the ecotone between fields and Tilio-Carpinetum typicum forest, in the vicinity of the Struga Dobieszkowska Nature Reserve; the Parowy Janinowskie Nature Reserve [UTM: DC04] Luzulo pilosae-fagetum with numerous old beeches (Fagus sylvatica); Las Łagiewnicki [UTM: CC94] a forest complex of Tilio-Carpinetum and Potentillo albae-quercetum located in the city of Łódź; Górna Mrożyca [UTM: DC14] a protected area in the upper reaches of the River Mrożyca with Ribo-nigri Alnetum. Additionally, material was collected in two nature reserves located to the south of Łódź: the Molenda Nature Reserve [UTM: CC92] a mosaic of woodland with fir (Abies alba), beech (Fagus sylvatica) and spruce (Picea abies); the Wolbórka Nature Reserve [UTM: CC92] Circeo-Alnetum in the Wolbórka river valley. MATERIAL AND METHODS The material used in these studies was collected using pitfall traps in several localities during winters 2000/01, 2001/02 and 2005/06. Additional specimens were caught using an entomological hand net, or by actively searching under stones, pieces of decaying wood or leaves, and using Moericke traps (both in the plant growth season and in winter) in 2005/06 and In total, more than 1000 specimens of Chelidurella sp. were collected. As the females of Chelidurella acanthopygia and C. guentheri are morphologically indistinguishable from each other, our analysis was based only on males. Altogether 109 males were analysed. All the other individuals were females and larvae. The insects were identified using the keys to Chelidurella species by KOČÁREK &

3 JASKUŁA R. et al.: Chelidurella guentheri GALVAGNI, 1994 (Dermaptera: Forficulidae) 425 GALVAGNI (2000) and KOČÁREK et al. (2005). The main feature enabling one to recognize these two morphologically similar species is the distal part of the male pygidium, which in C. acanthopygia is narrow and triangular in the caudal view and its apex is usually simple and rounded, whereas in C. guentheri it is more or less subparallel in the caudal view, with a concave apex (Fig.). All our male material represented the typical form of the latter species. Fig. Shape of the male pygidial apex in: a Chelidurella acanthopygia, b Ch. guentheri (after KOČÁREK et al. 2005). Material examined Dobieszków Range, , 5, pitfall traps; 24, Moericke trap, ASM leg.; Górna Mrożyca, , 1, ASM leg.; Parowy Janinowskie Nature Reserve, , 7, pitfall traps, ASM leg.; , 28, pitfall traps, ASM leg.; Struga Dobieszkowska Nature Reserve, , 7, pitfall traps, ASM leg.; , 6, pitfall traps, ASM leg.; Las Łagiewnicki, , 9, entomological hand net, JH leg.; Wolbórka Nature Reserve, , 7, pitfall traps, ASM leg.; Molenda Nature Reserve, , 9, pitfall traps, , 6, pitfall traps, ASM leg. RESULTS AND DISCUSSION According to LIANA (1990, 2007), Chelidurella guentheri was not known from Poland before. This is the seventh dermapteran species noted from this country; the others are Ladibura riparia (PALLAS, 1773) (Labiduridae), Labia minor (LINNAEUS, 1758) (Spongiphoridae (=Labiidae)), Forficula auricularia LINNAEUS, 1758, Anechura bipunctata

4 426 Polish Journal of Entomology 80 (3) (FABRICIUS, 1781), Apterygida media (HAGENBACH, 1822) and Chelidurella acanthopygia (GÉNE, 1832) (Forficulidae). One additional species, Chelidurella transsilvanica EBNER, 1932 was reported by HAAS (2004) as occurring in Poland, but that author gave no details of any localities or even regions of the country. This species was mentioned by BAZYLUK (1976) as possibly occurring in south-eastern Poland, as it had been recorded in the Carpathians in western Ukraine and Romania, but there is no documented literature data about its occurrence in Poland. All the male specimens of Chelidurella that we studied belong to the recently described C. guentheri GALVAGNI, As this species has so far been reported from Germany, France, the Netherlands, southern Norway and the Czech Republic (GALVAGNI 1994, 1996, KOČÁREK & GALVAGNI 2000, KOČÁREK et al. 2005), the localities presented in this paper are the easternmost ones of its currently known distribution (KOČÁREK et al. 2005). Our finding of C. guentheri in central Poland suggests that it probably occurs in the greater part of Poland, at least in its central and southern parts, and that it may well be very common in some regions. According to KOČÁREK et al. (2005) this species is also very common in the Czech Republic and Slovakia. Interestingly, we did not record any male of C. acanthopygia, a species traditionally regarded as common in Poland (BAZYLUK 1976, LIANA 2007); the results from central Poland confirm the suggestions by KOČÁREK & GALVAGNI (2000) and KOČÁREK et al. (2005), who include northern Italy, Slovenia, Austria and Hungary, as well as Slovakia and the Czech Republic in its distribution range. The discovery of C. guentheri in central Poland as well as the present-day knowledge of the distribution of C. acanthopygia clearly imply that further in-depth faunistic studies, as well as a re-examination of old Dermaptera collections deposited in Polish museums, should be carried out to clarify the distribution of both species in Poland. It is to be expected that at least some Polish material previously identified as C. acanthopygia will turn out to be C. guentheri (KOČÁREK et al. 2005). REFERENCES BAZYLUK W Skorki Dermaptera. Katalog Fauny Polski, cz. XVII, 27. Muzeum i Instytut Zoologii PAN, Warszawa, 19 pp. BEDNARZ S Orthoptera, Blattodea et Dermaptera of Trzebnicko-Ostrzeszowskie Hills. Acta Zoologica Cracoviensia 31: CAPRA F Sulla Chelidurella acanthopygia (GENE) e su una nouva specie dell Alto Adige (Insecta: Dermaptera). Memorie della Societa Entomologica Italiana 60: GALVAGNI A Chelidurella guentheri specie nuova dell Europa centrale e della Norvegia Sudorientale (Insecta, Dermaptera, Forficulidae). Atti Accademia roveretana Agiati, ser. VII 3(B), 243: GALVAGNI A Chelidurella vignai specie nuova delle Alpi Sud-orientali (Insecta, Dermaptera, Forficulildae). Annali del Museo Civico di Rovereto, Sezione Archeologia, Storia e Scienze Naturali 10:

5 JASKUŁA R. et al.: Chelidurella guentheri GALVAGNI, 1994 (Dermaptera: Forficulidae) 427 GALVAGNI A Identificazione e variabilita della Chelidurella acanthopygia (GENE, 1832) con istituzione della Chelidurella fontanai sp. n. (Insecta, Dermaptera) Atti Accademia roveretana Agiati, ser. VII, 6(B) 246: GALVAGNI A Contributio alla conoscenza del genere Chelidurella VERHOEFF, 1902, in Italia e territori limitrofi (Insecta, Dermaptera). Atti Accademia roveretana Agiati, ser. VII, 7(B) 247: GRABOWSKI M Skorki (Dermaptera) i Karaczany (Blattaria). [In:] JASKUŁA R., TOŃCZYK G. (eds). Owady Insecta Spalskiego Parku Krajobrazowego. Tom 1. Mazowiecko-Świętokrzyskie Towarzystwo Ornitologiczne, Spała, pp.: HAAS F Fauna Europaea: Forficulidae. [In:] HELLER K.G. (ed.). Fauna Europaea: Orthopteroid orders. Fauna Europaea version 1.1, KOČÁREK P Orthopteroid insects (Orthoptera, Blattaria, Dermaptera) of the Polesie National Park and its surroundings. Parki Narodowe i Rezerwaty Przyrody 19: KOČÁREK P., GALVAGNI A Species of Chelidurella (Dermaptera: Forficulidae) in the territory of the Czech Republic and Slovakia. Klapalekiana 36: KOČÁREK P., HOLUŠA J., VIDLIČKA L Blattaria, Mantodea, Orthoptera & Dermaptera of the Czech and Slovak Republics. Kabourek, Zlin, 348 pp. KONDRACKI J Geografia regionalna Polski. PWN, Warszawa, 442 pp. KUROWSKI J.K. (ed.) Park Krajobrazowy Wzniesień Łódzkich. EKO-WYNIK Spółka z o. o. Łódź, 183 pp. LIANA A Dermaptera Skorki. [In:] RAZOWSKI J. (ed.). Checklist of Animals of Poland, vol. 1. Wydawnictwo PAN, Wrocław, Warszawa, Kraków, p.: 53. LIANA A Skorki (Dermaptera). [In:] BOGDANOWICZ W., CHUDZICKA E., PILIPIUK I., SKIBIŃSKA E. (eds). Fauna of Poland. Characteristic and checklist of species, II. Muzeum i Instytut Zoologii PAN, Warszawa, pp.: 5-7. RĄKOWSKI G., WALCZAK M., SMOGORZEWSKA M. (eds) Rezerwaty przyrody w Polsce Środkowej. Instytut Ochrony Środowiska, Warszawa, 528 pp. VIGNA TAGLIANI V.A Studi sui Dermatteri. V. Una nouva Chelidurella dell Apenino meridionale (Dermaptera, Forficulidae). Memorie della Societa Entomologica Italiana 72: Received: March 10, 2010 Accepted: December 27, 2010