First record of the terrestrial isopod Platyarthrus parisii Arcangeli, 1930 (Crustacea: Oniscidea: Platyarthridae) for the European continent, with remarks on Platyarthrus schobliiBudde-Lund, 1885 Lluc GARCIA, Manuel BAENA, Álvaro PÉREZ-GÓMEZ and Daniel ROJAS SHNB Garcia, L., Baena, M., Pérez-Gómez, Á. and Rojas, D. 2018. First record of the terrestrial isopod Platyarthrus parisii Arcangeli, 1930 (Crustacea: Oniscidea: Platyarthridae) for the European continent, with remarks on Platyarthrus schoblii Budde-Lund, 1885. Boll. Soc. Hist. Nat. Balears, 61: 113-119. ISSN 0212-260X. e- ISSN 2444-8192. Palma (Illes Balears). The terrestrial isopod Platyarthrus parisii Arcangeli, 1930 (Oniscidea: Platyarthridae), a myrmecophilous species, is recorded for the first time at continental Europe. All the specimens studied come from different locations in the south of the Iberian Peninsula (Cádiz, Tarifa and Jerez de la Frontera, in the region of Andalusia, Spain). Besides, some morphological traits of this species are illustrated NATSUORCAIEL TDAET L DE’SH IBSATLÒERAIAR S for the first time. Differences with Platyarthrus schoblii Budde-Lund, 1885, of which it was considered a subspecies, are discussed. The validity of the current subspecies Platyarthrus schoblii intermedius Vandel, 1946 is also discussed. Key words: Isopoda; Oniscidea; Platyarthrus; Iberian Peninsula. PRIMERA CITA DE L'ISÒPODE TERRESTRE Platyarthrus parisii ARCANGELI, 1930 A EUROPA CONTINENTAL AMB NOTES SOBRE Platyarthrus schoblii BUDDE-LUND, 1885. Es cita per primera vegada a Europa continental l'isòpode terrestre mirmecòfil Platyarthrus parisii Arcangeli, 1930 (Oniscidea: Platyarthridae). Tots els exemplars estudiats procedeixen de diverses localitats del sud de la península Ibèrica (Cádiz, Tarifa i Jerez de la Frontera, a la regió d'Andalusia, Espanya). S'il·lustren per primer cop alguns dels seus caràcters morfològics i es discuteixen les diferències entre aquesta espècie i Platyarthrus schoblii, de la qual va ser considerada una subespècie. També es discuteix la validesa de la subespècie Platyarthrus schoblii intermedius Vandel, 1946. Paraules clau: Isopoda; Oniscidea; Platyarthrus; Peninsula Ibèrica. Lluc GARCIA, Museu Balear de Ciències Naturals; P.O. Box nr. 55. Sóller (Mallorca) Balearic Islands 07100. Spain.; [email protected], Corresponding author; Manuel BAENA, Departamento de Biología y Geología, I.E.S. Alhaken II, c/ Manuel Fuentes “Bocanegra” s/n, 14005 Córdoba. Spain, [email protected]; Álvaro PÉREZ-GÓMEZ Calle Sierra de Palo nº6, 11406, Jerez de la Frontera, Cádiz. Spain; E-mail: [email protected] ; Daniel ROJAS 11380, Tarifa (Cádiz). [email protected] Recepció del manuscrit: 19-setembre-2018; revisió acceptada: 31-desembre-2018. 114 Boll. Soc. Hist. Nat. Balears, 61 (2018) Introduction Method The genus Platyarthrus Brandt, 1833 The specimens were found in the field, comprises about 28 described species of under stones or inspecting ant nests, and small terrestrial isopods (Oniscidea: collected by a brush impregnated with Platyarthridae), most of them are alcohol. They were preserved and stored in myrmecophilic. Species of this genus are 70% ethanol. mainly distributed by the Mediterranean For the morphological study, they were region and part of the Middle East, besides treated for a few hours with Aman's in some oriental Atlantic islands and coasts, Lactophenol liquid and dissected under the central Asia, India and Yemen (see stereomicroscope (Olympus VMT and Schmalfuss, 2003; Taiti & Checcucci, Euromex Nexius). Appendices and 2009). Because of their ability for living mouthparts have then been mounted on a inside the ant nests, some Platyarthrus slide using Faure's liquor. The drawings species have been transported by man, with were made in pencil under an Olympus their host ants, beyond their natural CH30 optical microscope equipped with an distribution area (see Garthwaite & Taiti, Olympus DA camera lucida. The final 1989; Tartally et al., 2004). So far both in illustrations have been inked by hand, the Iberian Peninsula and the Balearic tracing the sketches with a light box. archipelago, there have been recorded 6 To analyze the dorsal sculpture, an species of this genus (see Schmalfuss, entire specimen was dyed with methylene 2003). blue dissolved in the lactophenol, to Platyarthrus parisii Arcangeli, 1930 is a highlight the tergal ribs by contrast. The myrmecophilous species, known so far only sample was then photographed using a from the Canary Islands and Morocco digital Dino-Lite microscope and the final (Arcangeli, 1930; Taiti & Rosano, 2015). In image, once desaturated, were modified to this paper, it is mentioned for the first time improve brightness and contrast levels. in the Iberian Peninsula and also in the European continent. Some of the male morphological Results characters and the tergal structure are illustrated. Up to date, the mouthparts, have Platyarthrus parisii Arcangeli, 1930 not been illustrated yet. The morphology of Platyarthrus schöbli parisii Vandel, 1946 this parts has been also drawn to facilitate Platyarthrus parisii Taiti & Rosano, 2015 further comparisons with other related species. The studied morphological Studied material: characters of Platyarthrus parisii have been 10/06/2006 Cádiz, Los Barrios, Montera compared with those of Platyarthrus del Torero, Manuel Baena leg. 4 ♀;no ants schoblii Budde-Lund, 1885, that Vandel were collected. 01/04/2018 Cádiz, Tarifa, (1946) have considered as a subspecies of Daniel Rojas leg. 10 ♀, 4 ♂; in two nests of the former. Pheidole pallidula. 21-04-2018 Cádiz, Jerez de la Frontera, Álvaro Pérez Gómez leg. 3♀; inhabiting with Pheidole pallidula. The samples are deposited in the collection of the first author. L. Garcia et al., First record of Platyarthrus parisii (Crustacea: Oniscidea) in Europe 115 Fig. 1. Platyarthrus parisii . Cádiz (Spain). A. ♀ Habitus. B. ♂ Seventh pereiopod (frontal). C. ♂ First pereiopod (caudal), D. ♂ First pereiopod (frontal). E. First antenna. Fig. 1. Platyarthrus parisii . Cádiz (Espanya). A. ♀ Hàbitus. B. ♂ Setè pereopodi (frontal). C. ♂ Primer pereopodi (caudal). D. ♂ Primer pereopodi (frontal). E. Antènula. 116 Boll. Soc. Hist. Nat. Balears, 61 (2018) Taxonomical remarks rib and an incomplete third rib have not The maximum size observed been described so far. The uropods of corresponds to a non-ovigerous female of Platyarthrus parisii have a relative short 2.82 mm total length (excluding the exopodite, measuring less than a third of uropods). The specimens have been the length of the basipodite. In P. schoblii identified based on the dorsal sculpture and the exopodite of the uropods reaches half other somatic characters and also on the the length of the basipodite. The shape of structure and shape of the first pleopod of the first and second pleopods of the male is the male. Some of the characters of the also different, especially the endopodite, male (i.e. first pleopod and the first and which would confirm its belonging to a seventh pereopods) have recently been different species (compare the Figs. 2 A-B depicted with material from North Africa and 3 C-D-E-F). In fact, Arcangeli (1952) (Taiti & Rosano, 2015), but the original again considers P. parisii as an independent description (Arcangeli, 1930) is based only species of P. schoblii but without illustra- on female specimens. ting its main differential characteristics. As As in the type illustrated by Arcangeli Taiti and Rosano (2015) indicated, the (1930) and Taiti & Rosano (2015), in our small differences in the shape of the specimens (Figs. 1A, 3B) the cephalothorax cephalothorax observed between the and the terguites are traversed specimens from Morocco and those of the longitudinally by five pairs of ribs, each of Canaries drawn by Arcangeli (1930), do not them formed by groups of 10-12 aligned allow to clarify if they are due to a scale-setae. In the first terguite the rib variability of the species since in the number 1 is short and domed and the rib-3 Canaries it was never collected again. It is reduced and does not reach as the others, would be necessary a completed to the front edge of the segment. The rib examination of more individuals of the number 4 lack. This is one of the Canarian archipelago and of the other morphological characteristics of this localities in order to reach a definitive species according to Vandel (1946). It is conclusion. also characterized by the frontal lobe that in this species tends to take quadrangular Remarks on Platyarthrus schoblii shape and lifted upwards. The lateral lobes Schmalfuss (2003) considered that the are large with rounded anterior external systematic situation of the Platyarthrus angles. schoblii complex is obscure and it is Mouthparts, male sexual characters and necessary to study the morphology of new other morphological details as illustrated material to elucidate if some of the (Figs. 1 B-E, 2 A-H). subspecies of P. schoblii should be considered as different species. In this line Discussion we have also studied specimens of Platyarthrus schoblii presenting a short Vandel (1946) considered Platyarthrus fourth rib in the first terguite, characteristic parisii as a subspecies of Platyarthrus that according to Vandel (1946; 1962) schoblii. However, within the variability of would be correponded to that of Platyarthrus schoblii, specimens with the Platyarthrus schoblii ssp. intermedius, first terguite with this shape of the external while in the nominal species this rib is totally missing. L. Garcia et al., First record of Platyarthrus parisii (Crustacea: Oniscidea) in Europe 117 Fig. 2. Platyarthrus parisii. Cádiz (Spain). A. ♂ First pleopod. B. ♂ Second pleopod. C. ♂ Genital papilla. D. Maxilliped. E. Second maxilla. F. First maxilla. G. Right mandible. H. Left mandible. Fig. 2. Platyarthrus parisii. Cádiz (Espanya). A. ♂ Primer pleopodi. B. ♂ Segon pleopodi. C. ♂ Apòfisi genital. D. Maxil·lípede. E. Maxil·la. F. Maxíl·lula. G. Mandíbula dreta. H. Mandíbula esquerra. 118 Boll. Soc. Hist. Nat. Balears, 61 (2018) Fig. 3. Cephalon and first tergites, dorsal view of (A) Platyarthrus parisii . Cádiz (Spain) and (B) Platyarthrus schoblii intermedius . Córdoba (Spain). C. ♂ First pleopod endopodite of Platyarthrus schoblii intermedius .D. ♂ First pleopod endopodite of Platyarthrus schoblii schoblii. E.♂ Second pleopod exopodite of Platyarthrus schoblii schoblii. F.♂ Second pleopod exopodite of Platyarthrus schoblii intermedius. Fig. 3. Cèfalon i primers terguits en vista dorsal de (A) Platyarthrus parisii, Cádiz (Espanya) i de (B) Platyarthrus schoblii intermedius, Córdoba (Espanya). C. ♂ Endopodi del primer pleopodi de Platyarthrus schoblii intermedius. D. ♂ Endopodi del primer pleopodi de Platyarthrus schoblii schoblii. E. ♂ Exopodi del segon pleopodi de Platyarthrus schoblii schoblii. F. ♂ Exopodi del segon plepodi de Platyarthrus schoblii intermedius. In the south of Spain and the Balearic present traces, more or less apparent, of rib- Islands there are populations of 4 in the first four terguites, an additional Platyarthrus schoblii with individuals that characteristic of the subspecies intermedius have the typical form and others in which (Fig. 3B). However, the males of the forms L. Garcia et al., First record of Platyarthrus parisii (Crustacea: Oniscidea) in Europe 119 we attribute to the nominal species and superiore d'Agricoltura in Portici, 24: 82- those that could be classified as belonging 91. to the subspecies intermedius have identical Arcangeli, A. 1952. La fauna terrestre isopodologica della Puglia e delle isole first pleopods (compare Figs. 3 C-D and 3 Tremiti e sua probabile origine in rapporto E-F). But, within the same population, all alla diffusione transadriatica di specie. the specimens examined present the same Memorie di Biogeografia adriatica, 2: 109- dorsal sculpture. For this reason, it seems 172. pertinent to maintain the validity of the Garthwaite, R. & Taiti, S. 1989. Platyarthrus subspecies intermedius for Platyarthrus aiasensis Legrand (Isopoda: Oniscidea: schoblii. Platyarthridae) in the Americas. Bulletin of the Southern California Academy of Sciences, 88: 42-43. Schmalfuss, H. 2003. World catalog of Additional material terrestrial isopods (Crustacea: Isopoda). Stuttgarter Beiträge zur Naturkunde, Serie Platyarthrus schoblii schoblii, 9/6/1998 A, Nr. 654: 1-341. Isla Congreso, Chafarinas Islands, Spain, Taiti, S. & Checcucci, I. 2009. New species and Guillem X. Pons leg. 4 ♀; 29/12/2002 records of terrestrial Isopoda (Crustacea, Sóller, Mallorca, Spain, Lluc Garcia leg. Oniscidea) from Socotra Island, Yemen. 2♂, 4♀; 20/03/2004 Jalón, Alicante, Spain, Zookeys, 31:73-103. José L. Lencina leg. 1♂. Taiti, S. & Rosano, C. 2015. Terrestrial isopods Platyarthrus schoblii intermedius, from the Oued Laou basin, north-eastern Morocco (Crustacea: Oniscidea), with 12/04/2003 Carcabuey, Córdoba, Spain, descriptions of two new genera and seven Manuel Baena leg. 1♂, 2♀; 22/04/2006 new species. Journal of Natural History, 49 Zuberos, Córdoba, Spain, Manuel Baena (33-34): 2067-2138. leg. 2♂, 6♀; 18/10/2005 Eivissa, Balearic Tartally, A., Hornung, E. & Espadaler, X. 2004. Islands, Spain, 1♂, 4♀, Lluc Garcia leg. The joint introduction of Platyarthrus schoblii (Isopoda: Oniscidea) and Lasius neglectus (Hymenoptera: Formicidae) into Acknowledgment Hungary. Myrmecologische Nachrichten, 6: 61-66. Vandel, A. 1946. Crustacés isopodes térrestres We thank Dr. Samuel Pinya (Museu (Oniscoïdea) épigés et cavernicoles du Balear de Ciències Naturals, Sóller, Portugal. Anaïs da Faculdade de Ciências Majorca) for his aid in the revision of the do Porto, 30: 135-427. text. Vandel, A. 1962. Faune de France, 66. Isopodes terrestres (deuxième partie), pp: 417-931. Paris. Bibliography Arcangeli, A. 1930. Isopodi terrestri raccolti nelle Isole Canarie dal Prof. Filippo Silvestri . (con aggiunte). Bollettino del Laboratorio di Zoologia generale e agraria della R. Scuola