Vindobonella leopoldina gen. n., sp. n. from Austria (Protura: Acerentomidae s. l.)

A new genus, Vindobonella gen. n. (Acerentomidae s. l.), and a new species, Vindobonella leopoldina sp. n., are described from Vienna. The new genus belongs to a group characterized by a reduced labial palp and a non-modified striate band on abdominal segment VIII.


INTRODUCTION
An investigation of the soil fauna of the city of Vienna revealed two new proturan species of the family Eosentomidae (Szeptycki & Christian, 2000).The new acerentomid species described in the present paper is placed in a new genus: Vindobonella gen.n.
Etymology: The genus name (female gender) is derived from Vindobona (lat.)= Vienna, the species name refers to the type locality Leopoldsberg.
Diagnosis (characters arranged according to their sup posed systematic significance): A genus of the family Acerentomidae s.l. ( = sensu Tuxen, 1964).Meso-and metanotum with 4 anterior setae.Seta P3 on urotergites II-VI anterior to line P2-P4.Abdominal legs II and III with 2 setae.Striate band on abdominal segment VIII nor mal.Labial palp without tuft.Seta P2a on meso-and metanotum nearer to P3 than to P2. Calyx of filamento di sostegno ovoid, smooth.Foretarsus with sensillum b', sensillum d nearer to c than to e, tl claviform (cf.Rusek, 1974), t2 spindle-like, t3 cylindrical.Head with postpseudocular seta.Dorsal lobe of telson with a single pore.Urosternite VIII with four setae.Habitus similar to Gracilentulus species.Description: Head without differentiated sensory setae.Postpseudocular seta present.Labial palp reduced, with three setae and a long, thick, more or less parallel-sided sensillum.Filamento di sostegno with smooth, ovate calyx and long, simple posterior filament.Pseudoculus round, with short lever.
Foretarsal sensillum b' present, tl claviform, t2 thick and pointed (not filiform and thin as in most Acerentomi dae), t3 cylindrical.Sensillum d inserted proximad to level of insertion of t2, much nearer to c than to e.
Seta P3 on abdominal terga II-VI anterior to line P2-P4.Seta P2a on urotergite I is a gemmate microchaeta, A5 on urotergite I and all accessory setae on abdominal segments II-VII are thin, linear microchaetae.Abdominal legs with 4, 2, and 2 setae, respectively, subapical seta on legs II and III more than twice length of apical seta.Urosternite II with seta P la.Pore psm present on the urotergites I-VIII,psl on VI and VII, al on II-VII.Sternal porotaxy of Acerentulus type: medial pore only on urosternite VII.Striate band on abdominal segment VIII well developed, normal.Hind margin of comb VIII straight.Urosternite VIII with 4 setae in one row, seta la absent.Urotergite X with seta la present, set of setae on urotergites IX and X identical.Urosternite XI with 4 setae.Hind margin of segments IX-XI and of the telson smooth.A single dorsal pore on the dorsal lobe of the tel son.Female squama genitalis of Acerentulus type, acrostyli situated subapically.
Affinities: Vindobonella gen.n. belongs to a group of acerentomid genera with a well developed (normal) striate band on abdominal segment VIII and a reduced labial palp without terminal tuft.In the structure of the foretarsus (the shape of sensillum b, the position of sensilla, the relatively long empodial appendage), in the pres ence of four setae on urosternite XI and in the short female squama genitalis the new genus is most similar to Tuxenidia Nosek & Cvijovic, 1969and Podolinella Szeptycki, 1995(Nosek & Cvijovic, 1969;Szeptycki, 1995).Vindobonella differs from both these genera in the pecu liar, thick and pointed sensillum t2 ("spindle-like", cf.Tuxen, 1964).From Podolinella it differs in the presence nr of specimens 5 1 3 1 of a postpseudocular seta on the head, the uniformly Not included in the type material: 1 preimago and 3 shaped head setae, the cylindrical sensillum t3 (in Podolinella it is "leaf-like"), and in the structure of the reduced labial palp (with a long apical seta -probably a rudiment of the terminal tuft -in Vindobonella, versus a small conical structure in Podolinella).It differs from Tuxenidia in the structure of the striate band (normal in Vindobonella, highly modified in Tuxenidia), the number of setae on urosternite VIII (4 versus 6), and the number of setae on abdominal legs II and III (2 versus 1).
Foretarsal sensillum b' present; tl claviform; t2 long and thick, pointed (spindle-like); t3 short, cylindrical, api cally rounded; d proximal to level of insertion of t2, much nearer to c than to e. External sensillum a of medium length, reaching base of y3; b extremely long, reaching base of claw; c subequal to a; d shorter than c, reaching base off.Internal sensillum a' situated on level of tl, long and thin, parallel-sided, reaching base of b'; b' and c' equal, long and thin, nearly seta-like.All exterior and interior sensilla, with exception of b, thin, parallel-sided.Proximal pore proximal to level of insertion of sensillum c.Setae ¡31 and 84 short, equal; the latter situated proximal to base of c'.Relative length of foretarsal sen silla: Claw without inner tooth; empodial appendage relatively long.BS about 0.5, TR 2.3-3.8;EU 0.3-0.4.
Trunk chaetotaxy as in Table 2. Urotergite I without P la; P2a of same shape as P la on nota; A5 as a short and thin linear microchaeta.Urotergites II-VI without setae P la and P3a; accessory setae are short and thin linear microchaetae.Urotergite VII with 3+3 anterior setae (A2, A4, A5); seta P la absent, P2a and P3a present.Accessory setae as on preceding tergites.Seta P4a like other acces sory setae, situated on the membrane between dorsal part of tergite and laterotergite.Pore psm on urotergites I-VIII, psl on VI and VII, al on II-VII: dorsal to A5 on uroterites II-VI, ventral to A5 on VII.Second anterior lines on urotergite VII visible only on the lateral part of the tergite.
Abdominal legs with 4, 2, and 2 setae, respectively; apical seta on legs II and III less than half the length of subapical seta.Accessory setae on urosternites I-VII of the same shape as on tergites, but shorter.Urosternite VII without seta Pc.Connecting line on urosternites IV-VI absent.Urosternites I-IV without pores; V with a single, asymmetrically situated pore; VI with 1+1 pores, VII with a single pore, situated medially near the hind margin of the tergite.
Striate band on abdominal segment VIII well developed, normal.Urotergite VIII with a more or less    regular row of small granules, and some granules forming the traces of a second row; urosternite with a single row of small granules.Comb VIII with straight hind margin, composed of 8-11 (mostly 9-10) slender teeth.Pore psm without surrounding teeth.Urosternite VIII with 4 setae, seta la absent.
Seta la on urotergites IX and X shorter than seta l.Urotergite XI with 2+2 setae, seta l absent.Setae on hind margin of dorsal lobe of telson short, equal.Dorsal pore single.Urosternite XI with 2+2 setae, external subequal to internal ones.
Maturus junior without seta P la on urosternite I and without setae on urosternite XI.Larva II with a larval seta on the ventral lobe of the telson.Larva I and prelarva unknown.
Chaetal variability: Asymmetrical lack of M2 on prosternum in one of five adults.

sp. nov.
Location of type material: In the collection of the Insti tute of Systematics and Evolution of Animals of the Polish Academy of Sciences, Krakow, except paratypes 6183 and 6187 and 2 maturi juniores at the Naturhistori sches Museum Wien.All specimens are mounted in Marc André II medium.