Campodea (Campodea) alluvialis Sendra

Sendra, Alberto, Jiménez-Valverde, Alberto, Gilgado, José D., Ledesma, Enrique, Baquero, Enrique, Pérez-Suárez, Gonzalo, Cuesta, Eva, Herrero-Borgoñón, Juan J., Jordana, Rafael, Tinaut, Alberto, Barranco, Pablo & Ortuño, Vicente M., 2017, Diplurans of subsurface terrestrial habitats in the Iberian Peninsula, with a new species description (Diplura: Campodeidae), Zootaxa 4291 (1), pp. 61-80 : 73-76

Campodea (Campodea) alluvialis Sendra , new species

Material studied. Prebaetic Mountains : Barranc del Xarquet, 1 ♂, alluvial MSS, 2 SSD, IV 2012 ; 4 ♂♂, 5 ♀♀, 4 juveniles, alluvial MSS, 2SSD, VII 2012; 12 juveniles, alluvial MSS, 2SSD, IX 2012. Barranc de Turrubanes , 1 juvenile, alluvial MSS, 1 SSD, IX 2012 . GIBSES leg. Serpis river, 1 ♀, under a stone, 8 V 2001, A. Sendra leg. Sellent river ; 1 ♀, clay soil, 2 III 2002 , A. Sendra & A. Moreno leg. Dry watercourse near Xaló , Alacant, 1 ♀, 7 II 2004 V .M. Ortuño leg.

Type material: ♀ holotype, 4 ♂♂ and 4 ♀♀ paratypes from Barranc del Xarquet, elev. 540 m, Tàrbena, Alacant, alluvial MSS, 2SSD, VII 2012, deposited in Torres Sala Entomological Collection; 1 ♂ paratype from same locality and SSD collected in April 2012, deposited in MCNB (Natural Science Museum of Barcelona).

Description. Holotype female length 2.5 mm, one paratype female 2.4 mm; length of two males 2.2, 2.3 mm. Antennae and cerci two-thirds length of body. Epicuticle with microdenticles; body with short and smooth clothing setae.

Complete antennae with 21‒22 antennomeres in juveniles, 23‒25 antennomeres in adults. Sensillum of third antennomere small, located in ventral position between macrosetae d and e. Antennomeres small, longer than wide. Cupuliform organ on apical antennomere containing four simple sensilla. Short gouge sensilla (12 µm) with up to 2 to 4 sensilla in one single distal whorl. Frontal process not developed, with one apical macroseta and two posterior macrosetae, each with one or two distal barbs. Three macrosetae along line of insertion of antennae, and with the following relative lengths: a = 0.63, p = 0.73, i = 1; x setae not differentiated. Labial palp suboval, with lateroexternal sensillum, two guard setae, up to 8 setae on anterior border and up to 80 neuroglandular setae.

Pronotum and mesonotum each with 1+1 ma, 1+1 la, 1+1 lp macrosetae, metanotum 1+1 ma; their length in relations with the length of the body has shown in Table 4; ma and la macrosetae relatively short in relation with the longer lp macrosetae. Marginal setae slightly differentiated from clothing setae except the more lateral which bear few short distal barbs. Legs short, metathoracic legs reaching abdominal segment VI. Femur III without dorsal macrosetae. Tibia III with a short ventral macroseta (32 µm) with a short apical barb. Calcars with long barbs almost from their basis. Dorsal and lateral tarsal setae smooth. Claws subequal slightly curved, without lateral crests. Telotarsal process smooth and setiform.

Body length (mm) HTL (µm) Lengths of notal macrosetae (µm)

Pronotum Mesonotum Metanotum ma la lp ma la lp ma 1.5 430 30 23 55 29 25 63 28 1.4 454 25 22 60 25 24 60 22 1.6 480 30 22 62 25 30 65 28 1.8 632 30 25 75 27 35 72 27 2.2 635 38 28 82 32 40 80 30 2.5 793 50 40 105 50 62 100 42 2.3 808 50 38 98 45 58 105 48 2.2 812 47 40 100 40 55 102 43 2.4 816 52 42 102 50 55 101 45 Distribution of abdominal macrosetae on tergites ( Fig. 3 ): 1+1 lp on V to VII, 3+3 lp1 to lp3 on VIII and 5+5 lp1 to lp5 on IX; all long and well barbed. Urosternite I with 6+6 thick macrosetae with long barbs; urosternites II to VII with 4+4 macrosetae, urosternite VIII with 1+1 macrosetae. Apical setae of styli with basal tooth divided in two branches and 0, 1 or 2 thin subapical barbs; smooth subapical setae and ventral medial setae bifurcated tips. Cercus base followed by up to 10 short primary articles, each bearing two whorls of macrosetae with barbs on distal two-thirds, mixed from proximal to distal articles with one to three whorls of smooth setae; distal end of each article bearing whorl of smooth microsetae.

Male urosternite I with field of glandular setae on posterior margin with up to 100 g 1 -glandular setae and two subtrapezoidal appendages bearing two fields of up to 30 a1 -glandular setae on apex and field of 15 thinner a2 - glandular setae lateral-internally. Female subcylindrical appendages with up to 14 a1 -glandular setae.

Remarks. The absence of lateral posterior macrosetae on the metanotum is an uncommon characteristic shared by a few species of the Campodea subgenus from the western European region: Campodea staphylinus Westwood, 1842 , Campodea galilaea Wygodzinsky, 1942 , cited by Bareth (1980) as an isolated population from Sardinia Island; Campodea pusilla Condé, 1957 and Campodea navasi Sendra & Moreno, 2004 . Due to geographical proximity and the absence of lateral anterior macrosetae on the urotergites, C. navasi is likely the most similar to C. alluvialis n. sp. In fact the specimen from Serpis river was quoted as Campodea navasi by Sendra & Moreno (2004). Both are small species, 2‒3 mm in length; they have short, smooth clothing, epicuticle with microdenticles, simple thoracic macrosetae and marginal setae or glandular fields on urosternite I and their appendages. The key feature for discriminating the species is the presence of a pair of lateral posterior macrosetae on urotergite V (absent in C. navasi ). Also, the number of antennomeres is slightly greater in C. alluvialis n. sp. (17‒21 antennomeres in C. navasi , 23‒25 in C. alluvialis n. sp. in adults); and the differential in length and thickness between marginal setae and clothing setae is greater in C. alluvialis Sendra n. sp. than in C. navasi .

Etymology. The specific name for this new species, alluvialis , is derived from its alluvial-dwelling habitat in dry spots of rivers ( Fig. 4 ).

Habitat and distribution. Campodea alluvialis n. sp. occurs in non-flooded spots of channel rivers and is almost exclusively located in alluvial debris, alluvial MSS ( Fig. 4 ). Its known distribution is in several alluvial nonflooded spots around watersheds in eastern of Prebaetic Mountains such as: the Guadalest-Bolulla, the Xaló, the Girona, the Serpis, and the Xúquer watersheds ( Fig. 1 ).

Figures

FIGURE 1. Map of known locations of Diplura in MSS habitats in the Iberian Peninsula in addition to previously reported French MSS sites (Bareth 1983).

FIGURE 3. Campodea (Campodea) alluvialis n. sp., holotype ♀, urotergites V – VIII.

FIGURE 4. Habitats of Campodea (Campodea) alluvialis n. sp. A ‒ C. Alluvial MSS habitat in Barranc del Xarquet (Tàrbena, Alacant). A. Panoramic view of the ravine; B. SSD installation in alluvial MSS; C. Pitfall trip from SSD after three months of sampling. D, E. MSS habitat in Barranc de Turrubanes (Vall d’Ebo, Alacant). D. SSD installation in the alluvial MSS; E. Panoramic view of installation site.