Eukoenenia amatei, Mayoral & Barranco, 2017

Mayoral, J. G. & Barranco, P., 2017, A cave-dwelling Iberian palpigrade (Arachnida: Palpigradi) of the Eukoenenia mirabilis group, Zootaxa 4363 (4), pp. 561-568 : 562-563

Eukoenenia amatei sp. nov.

( Figs. 1‒13 )

Material examined. Holotype: ♀, Cueva Nueva, 36º51’11’’ N, 2º31’ 57,42’’O, 592 m. o.s.l. T.M. de Almería, Sierra de Gádor, Almería, Spain, 26 November 1995, leg. P. Barranco & J. Amate, (UAL-Pp-005). Deposited in the collection of the Universidad de Almeria CECOUAL.

Description of female. Prosoma. Frontal organ with two elongated and granulated branches, 2.1 times longer than wide (28, long and 13, wide). Lateral organ with one pointed, granulate blade, 1.9 times longer than wide (28/ 15). Propeltidium with 10 + 10 short setae. Metapeltidium with 3 + 3 setae, t1 (25) much shorter than t2 (98) and t3 (65). Hand of chelicera with 6 dorsal and one ventral seta, each finger with 9 teeth. Basal segment of the chelicera with three setae in the distal series (d1-d3): d3> d2> d1; d1 thing, tapering and with small setules along its length, 53 long. d2 and d3 thickened, with subparallel borders, tiny setules and a truncated tip; d2 with a crown of spines on the truncated tip; d2 and d3 95 and 60 long, respectively ( Fig. 1 ). Sternum with 11 deuto-tritosternal setae.

Chaetotaxy of coxae. Pedipalp coxa with 19 setae of different lengths ( Fig. 2 ). Coxa I with 15 setae: 13 normal setae and two microsetae ( Fig. 3 ). Coxa II with 12 setae: 3 thickened and 9 normal setae ( Fig. 4 ). Coxa III with 11 setae: 3 thickened setae, one long macroseta and 7 normal setae ( Fig. 5 ). Coxa IV with 8 setae: 2 thickened and 6 normal setae ( Fig. 6 ). Thickened setae on coxae are tapering with a minute, obliquely projecting spine at the truncated tip. Coxae formula: Pcx: 19n; Icx: 13n, 2 ms; IIcx: 9n, 3 ts; IIIcx: 7n, 3 ts, 1 m; IVcx: 6n, 2 ts.

Palp ( Figs 7‒8 ): ta3 with 12 normal setae, 1 bifurcate seta (fs), 1 curved seta (cs), 4 macrosetae (m) and seta r absent ; ta2 with 1 normal seta and 5 macrosetae; ta1 with 1 normal seta and 1 macroseta; bta2 with 4 normal setae and 2 macrosetae; bta1 with 3 normal setae; ti with 9 normal setae; fe with 7 (8 on the other side) normal setae; tc with 7 long and 2 short normal setae. Palp formula: ta3: 12n, fs, cs, 4 m; ta2: 1n, 5 m; ta1: 1n, 1 m; bta2: 4n, 2 m; bta1: 3n; ti: 9n; fe: 7‒8n; tc: 9n (including 2 short ones, not ms).

Leg I ( Figs 9‒10 ): ta3 with 18 normal setae, 5 macrosetae, 2 bifurcate setae (fs) with equal branches and r; ta2 with 5 normal setae, 1 trichobothrium (tb) and 1 bifurcate seta (fs) with equal branches; ta1 with 5 normal setae; bta4 with 5 normal setae, 1 tb and 1 fs; bta3 with r, grt and 1 microseta; bta2 with 3 normal setae, 2 tb, and 1 fs with equal branches; bta1 with 2 normal setae, 2 tb and 1 fs with unequal branches; ti with 10 normal setae; pa with 9 normal setae and 1 tb; fe with 9 normal setae; tc with 12 normal setae, of which two are considerably smaller than the others. Leg I formula: ta3: 18n, 5 m, 2 fs, r; ta2: 5n, 1 tb, 1 fs; ta1: 5n; bta4: 5n, 1 tb, 1 fs; bta3: r, grt, 1 ms; bta2: 3n, 2 tb, 1 fs; bta1: 2n, 2 tb, 1 fs; ti: 10n; pa: 9n, 1 tb; fe: 9n; tc: 12n.

Basitarsus leg IV (IVbta) (Fig. 11) with seven setae: pair esd inserted most distally; gla inserted about one third from the base of segment; r inserted proximal of gla and followed closely by pair esp; grt inserted proximal to all other setae.

Lengths and ratios given in measurements below.

Opisthosoma: Tergites II‒VI each with 3 + 3 dorsal setae: t1, t3 and one slender lateral seta s on each side. Sternite III, with 2 + 2 setae. Sternite IV with 3 + 3 setae, inner ones (a1, a2) 55 long and s1 35 long. Sternite V with a1, a2 68 and 55 long, and s 1, s 2 45 and 35 long, respectively. Sternite VI bearing 8 normal setae: medial 2 setae (a1) 50 long and (a2) 55 long; in addition, s1 and s2 setae on each side of a2, 50 and 40 long, respectively ( Fig. 12 ). Sternite VII with (a 1) 50 long, and s 1, s2 40 long. Segments VIII‒XI with 11, 6, 6 and 7 setae, respectively. Flagellum not preserved.

Genital region: Two of lobes with a total of 22 setae. First lobe with 9 + 9 setae in 5 transverse rows: 1 + 1, 1 + 1, 2 + 2, 1 + 1, and 4 + 4 on border of lobe; of these, a4 (33-37) and a3 (32-35) longer than a2 (29-30) and a1 (24- 27). Second lobe with 2 + 2 setae, z (18-20) and y (15) ( Fig. 13 ).

Measurements. Body: L 1176, B 330. Palp: Pcx 143, Ptc 198, Pfe 138, Pti 185, Pbta1 65, Pbta2 85, Pta1 53, Pta2 55, Pta3 80. Leg I: Icx 182, Itc 238, Itfe 170, Ipa 203, Iti 207, Ibta1+2 170, Ibta3 90, Ibta4 83, Ita1 40, Ita2 53, Ita3 180. Leg IV: IVcx 108, IVtc 130, IVfe 198, IVpa 173, IVti 238, IVbta 198, IVta1 80, IVta2 82, a 18, er 60, grt 115, gla 108, r 100, esd 66-68, esp 78-85. Ratios: t/r 1.98, t/er 3.3, gla/grt 0.94, B/bta 1.67, bta/ti 0.83.

Male. Unknown.

Etymology. This species is named after the collector of the species, Juan Amate Salmerón.

Figures

FIGURE 12. Eukoeneneia amatei sp. nov. Ventral chaetotaxy of opisthosoma.Scale bar 100 µm.

FIGURE 13. Eukoenenia amatei sp. nov. Female genitalia, ventral view.Scale bar 25 µm.

FIGURE 1–6. Eukoeneneia amatei sp nov. 1, Distal series of setae (d 1 ‒ d 3) on the basal segment of the chelicera.Scale bar 50 µm. 2, Pedipalp coxa.3, Coxa I. 4, Coxa II. 5, Coxa III. 6, Coxa IV. Scale bar 100 µm. Thickened setae (ts) in solid black.

FIGURE 7–8. Eukoeneneia amatei sp. nov. 7, Palp:ta3‒bta1. 8, Palp: ti-tc.Scale bar 100 µm.

FIGURE 9–10. Eukoeneneia amatei sp. nov. 9, Leg I: ta3-‒bta1+2. 10, Leg I: ti‒tc. Scale bar 100 µm. FIGURE 11. Eukoeneneia amatei sp. nov. Leg IV, bta. Scale bar 100 µm.