Traegaardhia nasuta Zacharda, 2010

Zacharda, Miloslav, Fong, Daniel, Hobbs Iii, Horton H., Piva, Erminio, Slay, Michael E. & Taylor, Steven J., 2010, 2474, Zootaxa 2474, pp. 1-64 : 21-26

Traegaardhia nasuta Zacharda , n. sp. ( Figs 13–16)

Material examined

HOLOTYPE: adult male, northeastern Italy, Veneto, the Hills of Conegliano, San Pietro di Feletto (Treviso), Buso dei Zambon Cave (6080 V/ TV), 190 m a.s.l., coll. E. Piva, 12.3.1994, deposited in the Museum of Biological Diversity , Ohio State University, Type No. OSAL0007422.

Diagnosis

Naso strikingly enlarged, lobe-shaped. Cheliceral fixed digit terminates in four cusps, two of them subapical, and with distinct prebasal lateral fissure located at level of insertion of proximal cheliceral seta; proximal cheliceral seta inserted at level of articulation of movable digit; tip of proximal cheliceral seta overlaps insertion of distal seta. Cheliceral movable digit serrated along approximately distal third of masticatory surface. Palpal tarsus longer than femorogenu, with twelve ciliated setae and one spiniform solenidion. Coxae I, II, III, IV with 3-1-5-3/4 finely pubescent setae, respectively. Rhagidial organ I comprised of five rhagidial solenidia (ω) lying in tandem in confluent depressions; distal solenidion in separate depression; stellate famulus (ε) subtending proximal rhagidial solenidion. Tarsus II with three rhagidial solenidia lying in tandem in confluent depressions, and small spiniform famulus (ε) subtending proximal rhagidial solenidion.

Affinities

Traegaardhia nasuta n. sp. differs from the other known Traegaardhia -species in (1) the strikingly enlarged lobe-shaped naso; (2) the morphology of the cheliceral fixed digit with large subapical cusps; (3) the rhagidial organ I comprised of five rhagidial solenidia lying in tandem, four proximal of them in confluent depressions, proximal stellate famulus subtending proximal rhagidial solenidion.

Etymology

The epithet nasuta refers to the enlarged lobe-shaped naso which resembles a nose (= nasus in Latin). Feminine gender.

Description

Adult male (one examined). Length of idiosoma 1248 µm. Ratio of leg I length to idiosomal length 2.04.

Gnathosoma . Subcapitulum slender, subtriangular ( Fig. 14E); ratio of length to breadth 1.54; distal hypostomal lips with spiniform internal and serrate external malar processes; adoral setae nude and overlapping apex of subcapitulum; proximal subcapitular setae pubescent, internal pair slightly longer than external pair. Dorsal surface of chelicera with shallow saddle-shaped depression at level of bases of digits ( Fig. 14A,B); cheliceral digits long, slender; dorsal surface of fixed digit with distinct short narrow rim above insertion of distal cheliceral seta; fixed digit terminates in four cusps, two of them in conspicuous subterminal position ( Fig. 14C), and with distinct prebasal lateral fissure located at level of insertion of proximal cheliceral seta; movable digit serrated along approximately distal third of masticatory surface. Chelicera with two setae; proximal seta inserted above articulation of movable digit; tip of proximal seta overlaps insertion of distal seta; tip of distal seta slightly overlaps apex of fixed digit. Length of chelicera 320 µm, dorsoventral width 99 µm, length of movable digit 112 µm, length of proximal and distal cheliceral setae 46 and 82 µm, respectively, distance between their insertions 36 µm. Ratios: cheliceral length to dorsoventral width 3.23, length of movable digit to length of chelicera 0.35, length of movable digit to dorsoventral width of chelicera 1.13. Palpal tarsus longer than femorogenu ( Fig. 14H); ratio of length to width of tarsus 5.53. Length of palpal trochanter, femorogenu, tibia and tarsus 49, 221, 105 and 238 µm, respectively. Number of setae and solenidia (in brackets) on palpal trochanter, femorogenu, tibia and tarsus 0-2-3-12(1), respectively; tarsal solenidion long, spiniform, erect. Small tubercle on apex of palpal tarsus.

Prodorsum. Naso well-developed, lobe-shaped ( Fig. 13A,C), with pair of internal vertical setae v 1 (bothridial setae sc 1 torn off in the examined specimen). Length of setae: v 1 99, v 2 125, sc 1 torn off, sc 2 198 µm.

Opisthosomal dorsum and anal region. Tegument very fine and transparent (cupules were not discernible); setae c 1 overlap insertions of successive d 1 ( Fig. 13A); d 1 and e 1 reach about three quaters of distance to insertion of successive seta; seta f 1 reaches to insertion of h 1. Length of setae: c 1 165, c 2 330, d 1 145, e 1 132, f 1 181, f 2 132, h 1 214, h 2 165, ps 1 148, ps 2 115, ps 3 56, ad 1 62 µm.

Podosoma. Coxae I, II, III, IV with 3-1-5-3/4 finely pubescent setae, respectively; three and four setae asymmetrically on coxae IV.

Genital region. Genital valves each with 6 finely pubescent genital setae (g) of similar length, about 28– 36 µm, arranged evenly along medial edge of valve ( Fig. 13B). Seven and eight aggenital setae (ag) of similar length, about 82–89 µm. Length of genital valves 138 µm. Sperm sac (ss) club-shaped, showing through tegument.

Legs. Leg I 2544 µm long, about twice as long as idiosoma. Basifemur of the leg IV subdivided into two equal parts ( Fig. 16). Empodia of all legs setulose, about as long as claws; claws each with small clawlet ventrobasally. Setae on all leg segments strikingly long and fine. Number of setae and solenidia (solenidia and famulus (ε) bracketed), respectively, on legs I-II-III-IV (Figs 15,16): trochanters 1-1-2-2, basifemora + telofemora 5+5-6+5-4+4-4+4, genua 11(1)-10(1)-8(1)-6, tibiae 11(2)-9(2)-9(2)-6(1), tarsi 18(5+ε)-16(3+ε)- 14-14. Genua I and II each with one erect spiniform distoventral solenidion (σ); genu III with one small spiniform dorsomedial solenidion. Tibia I with one erect spiniform dorsomedial solenidion (Φ), and one small dorsodistal rhagidial solenidion; tibia II with one spiniform erect dorsoproximal solenidion, and one lanceolate dorsodistal solenidion recessed in deep pit with large, broadly open surface pore ( Fig. 14D); tibia III with two erect dorsomedial spiniform solenidia arranged in tandem; tibia IV with one erect spiniform dorsoproximal solenidion. Tarsus I long and slender, its tip slightly tapers in lateral view; ratio length to width 19.0, with five rhagidial solenidia (ω) lying in tandem, four proximal of them in confluent depressions and one distal in separate depression dorsodistally; stellate famulus (ε) subtending proximal rhagidial solenidion ( Fig. 14F); tarsus II with three rhagidial solenidia lying in tandem in confluent depressions and small spiniform famulus (ε) subtending proximal rhagidial solenidion ( Fig. 14G).

Remark T. nasuta is a troglomorphic troglobiont.