Pseudachorutes vasylii, Kaprus’, Ighor J. & Weiner, Wanda M., 2009

Kaprus’, Ighor J. & Weiner, Wanda M., 2009, The genus Pseudachorutes Tullberg, 1871 (Collembola, Neanuridae) in the Ukraine with descriptions of new species, Zootaxa 2166, pp. 1-23 : 7-9

Pseudachorutes vasylii sp. nov.

Figs 22–31 , 83

Pseudachorutes laricis Arbea & Jordana, 1989 in: Kaprus’ et al. 2006

Description. Body length without antennae 0.50–0.65 mm. Colour in alcohol bluish-grey, ocular plate bluishblack. Tegumental granulation fine.

Antennae shorter than head. Ant. I with 7 setae, Ant. II with 12 setae and Ant. III with 19 ordinary setae. Ant. III and IV fused dorsally, ventral separation well marked. Sensory organ of Ant. III consisting of two small, globular internal sensilla, two subcylindrical guard sensilla (ventral sensillum is 1.25 times as long as dorsal one) and two guard setae between them; ventral microsensillum present. Ant. IV with about fifty ordinary setae and six distinct subcylindrical sensilla; dorsoexternal microsensillum and subapical organite present; apical vesicle simple or slightly bilobated ( Figs 23–24 ).

PAO round with 4–6 vesicles, 1.2–1.7 times larger than ocellus B ( Fig. 28 ). 8+8 eyes. Buccal cone elongated. Mandible with four teeth (medial tooth small, subapical tooth bigger than medial one) ( Fig. 25 ). Styliform maxilla with two lamellae; one of them with two small teeth, another one with tiny apical hook ( Fig. 26 ). Labral formula: 2/3,3,4 ( Fig. 83 ). Labium with 2+2 small organites x and small papillate seta L, with 12+12 ordinary setae ( Fig. 27 ). Perilabial area with 4+4 subequal setae.

Dorsal chaetotaxy as in Fig. 22 , with mesosetae and longer sensory setae s. Formula per half tergum as: 022/11111. Microsensilla on Th. II present. Head with unpaired seta d1, without a0 seta. Th. I with 3+3 setae. Th. II and III with 10+10 setae (a2, a5 and m4 setae absent). Abd. I–III with 8+8 setae (m-row and a3 setae absent) and Abd. IV with 9+9 setae (m-row setae absent), seta s = p5. Abd. V without a2 and p2 setae, seta s = p3.

Ventral chaetotaxy: thoracic sterna without setae, VT with 4+4 setae, Abds. II–VI as in Fig. 31 . Abds. I without setae, Abds. II with 4+4 setae, Abds. III with 6–7+6–7 setae.

Dens with six setae ( Fig. 30 ). Mucro slightly hooked with broad lateral lamella. Manubrium with 12+12 setae. Tenaculum with 3+3 teeth. Each anal valve with two setae hr ( Fig. 31 ).

Tibiotarsi I, II and III with 19, 19 and 18 setae, respectively, seta B7 absent on tibiotarsus III ( Fig. 29 ). Femora I, II and III with 13, 12 and 11 setae, trochanters I, II and III with 6, 6 and 6 setae, coxae I, II and III with 3, 7 and 8 setae, subcoxae 2 of legs I, II and III with 0, 2 and 2 setae, subcoxae 1 of legs I, II and III with 1, 2 and 2 setae, respectively. Claw with small inner tooth and without lateral teeth ( Fig. 29 ). Empodial appendage absent.

Type material. Holotype: male (on slide), Ukraine, Ivano-Frankivs’k district, Karpats’ky National Park, near Vorochta village, Chornohora ridge, Pozhyzhevska Mt., 1500 m alt., Duschekia viridis and Pinus mugo crooked forest, leaf litter, 27.VI.1991, leg. I. Kaprus’. Paratypes: 13 males and 12 females (on slides), the same data as holotype. The material is preserved in the following collections: holotype, 19 paratypes (10 males and 9 females) in SNHMU, 8 paratypes (5 males and 3 females) in ISEA.

Other material. 2 males and 2 females (on slides), Ukraine, Chernivtsi district, near Perkalab village, Chyvchyny ridge, Gnatasia Mt., 1500 m alt., Picea abies forest, leaf litter and moss, 14.VIII.1990, leg. I. Kaprus’; 4 males and 4 females (on slides), Ukraine, Ivano-Frankivs’k district, near Mykulychyn village, Gorgany ridge, 900 m alt., Fagus and Abies forest, leaf litter and moss, 25.VI.1991, leg. I. Kaprus’; 18 males and 15 females (on slides), Ukraine, L’viv district, near Skole town, Skolivs’ki Beskydy ridge, 1000 m alt, crooked Fagus forest, leaf litter and soil, 24.V.1990, leg. I. Kaprus’; 2 males (on slide), Ukraine, Zakarpattia district, near Vynogradove town, Chorna Mt., Fagus forest, leaf litter and soil, 5.IV.1989, leg. I. Kaprus’; 1 male and 2 females (on slides), Ukraine, Zakarpattia district, near Rakchiv town, Marmarosh ridge, Pip Ivan Mt., Picea forest, leaf litter and soil, 26.VIII.1991, leg. I. Kaprus’.

Etymology. The new species is dedicated to Vasyl I. Kaprus’, younger son of one of authors.

Biology. The species is connected with humid soil, litter and moss of Carpathians forests. Bisexual.

Discussion. The new species is related to Pseudachorutes laricis Arbea & Jordana, 1989 . Both species have the same type of dorsal chaetotaxy: with 3+3 setae on Th. I, without seta a2 on Th. II and Abd. V, the same type of apical bulb (simple or slightly bilobated), mucro (with long and broad lateral lamella). They differ in the labral formula: 2/3,3,4 in P. v a s y l i i sp. nov. and 2/2,3,3,4 in P. l a r i c i s (R. Jordana pers. comm.), in the number of postantennal vesicles (4–6 in the new species and 7–9 in P. l a r i c i s) and the presence of small tooth on the inner edge of claw in the new species (absent in P. laricis ). The labium in P. vasylii has additional morphological structures: 2+2 small organites x and small papillate setae L which are absent in P. l a r i c i s.

Figures

FIGURES 22 – 31. Pseudachorutes vasylii sp. nov. 22, dorsal chaetotaxy of body; 23, Ant. III and IV ventrally; 24, Ant. III and IV dorsally; 25, mandible; 26, maxilla; 27, labial chaetotaxy; 28, PAO and eyes; 29, distal part of leg III; 30, furca; 31, chaetotaxy of Abds. I – VI.

FIGURES 76 – 84. Shape and chaetotaxy of labrum: 76, Pseudachorutes corticicolus (Schäffer, 1896); 77, Pseudachorutes parvulus Börner, 1901; 78, Pseudachorutes subcrassus Tullberg, 1871; 79, Pseudachorutes pratensis Rusek, 1973; 80, Pseudachorutes scythicus sp. nov.; 81, Pseudachorutes janstachi sp. nov.; 82, Pseudachorutes palmiensis Börner, 1903; 83, Pseudachorutes vasylii sp. nov.; 84, Pseudachorutes vitalii sp. nov.