Ioniorhynchus henderickxi sp. nov.

(Figs 1–15)

Material examined, HOLOTYPE, 1♂: [p] Greece: Zakynthos, Spilia Cagioti-Giri, 25.IV.2013 H. Henderickx lgt. / red label [p] HOLOTYPE Ioniorhynchus henderickxi sp. nov. P. Hlaváč det., 2015. (NMPC).

Description. Body (Figs 1–3) shiny, elongate, dark olive coloured, antennae and tarsi lighter. Length of body 4.95 mm, maximum width of elytra 1.56 mm.

Head (Figs 4, 5) unpunctured at base, densely punctured behind rostral furrow. Eyes completely atrophied. Anterior part of rostrum (Fig. 4) wide, pterygia prominent, ratio HW/MWR = 1.25, smooth, with very sparse puncturation, with about 5 golden setae on each side, ratio WRF/MWR = 0.35, elevated rostral carinae, edges slightly arched, closest in middle, with about 6–7 punctures on sides; rostral furrow with well defined sulcus in posterior part, relatively short, ratio HL/LRF = 2.25.

Antenna (Fig. 6) slender and long, scape very long, evenly extended from base to apex, funicle only about 1.15 times as long as scape, scape about 6.4 times as long as wide and about 3.2 times as long as antennomere II which is 1.45 times as long as antennomere III; antennomeres IV–VIII subequal, elongate, slightly extended from base to apex; antennal club (Fig. 7) three segmented, pedunculate at base, 2.5 times as long as wide; funicle about 2.15 times as long as club, antennomere IX strongly extended from base to apex, funnel-like, twice as long as transverse antennomere X; terminal antenomere conical, slightly longer than X.

Pronotum (Fig. 8) slightly elongate, about 1.2 times as long as wide and 1.25 as long as head, shiny, with very uneven and sparse puncturation, punctures of different size, lacking setation, with ill-defined antibasal fovea.

Elytra (Fig. 9) elongate, about 1.8 times as long as wide, maximum width in the middle, smooth, shiny, with ten rows of punctured striae; width of interval variable, with uneven, sparse, short setae; apex of each elytron (Figs 10, 11) rounded, with more setae; laterally with large projection oriented downwards.

Legs (Figs 12, 13) long, slender; all femora and tibiae dentate on inner margins; protibiae (Fig. 12) and mesotibiae with three well-defined spines located in mid third of tibial length; metatibiae (Fig. 13) with five welldefined spines located in mid third and base of apical third; all femora with well-defined spine located on its widest part.

Male genitalia. Aedeagus (Figs 14, 15) long and slender; in lateral view S—shaped, with strongly curved, hook-like apex, median part straight, base less curved; in ventral view apex slightly oriented dextrally (right). Spiculum gastrale (Fig. 16) very long with wide lamina.

Sexual dimorphism. Female unknown.

Differential diagnosis. Ioniorhynchus henderickxi is similar to the sympatric species I. doriae and to I. gasparoi (Osella & Zuppa, 2006) in the same shape of rostrum with large, prominent pterygia (Figs 4, 5; Magrini et al. 2005: Figs 2, 3 ( I. doriae); Osella & Zuppa 2006: Fig. 1 ( I. gasparoi)). Pterygia are only slightly defined in I. loebli (Magrini et al. 2005: Figs 37, 38) and almost absent in I. imprevisus (Magrini et al. 2005: Figs 19, 20). An additional common feature for I. henderickxi, I. doriae and I. gasparoi is the sinistrally (left) oriented apex of the aedeagus in ventral view (Figs 14, 15). In contrast, the apex of aedeagus is dextrally oriented in ventral view in I. loebli (Magrini et al 2005: Figs 51, 52) and I. imprevisus (Magrini et al 2005: Figs 32, 33). Ioniorhynchus henderickxi differs from I. doriae and I. gasparoi by the different shape of the apex of the elytra with a large projection oriented laterally downwards (Figs 10, 11; Magrini et al. 2005: Figs 8, 9 (both I. doriae); Osella & Zuppa 2006: Fig. 1 ( I. gasparoi)), by different types of spines on the tibiae and femora (Figs. 12, 13; Magrini et al. 2005: Figs 11, 12 (both I. doriae); Osella & Zuppa 2006: Fig. 2 ( I. gasparoi)) and by the different shape of the aedeagus with the middle part straight (Figs 14, 15; Magrini et al. 2005: Figs 14, 15 (both I. doriae); Osella & Zuppa 2006: Fig. 3 ( I. gasparoi)).

Etymology. Patronymic, named after Hans Henderickx, Belgium, specialist on Pseudoscorpionida and the collector of the holotype.

Biology. The specimen was collected only a few meters deep in the cave where there was still a little bit of light, under a wet piece of wood.

Distribution. Greece (Zakynthos Island).