Eukoenenia roscia Christian & Isaia & Paschetta & Bruckner 2014, species nova
Creators: name: Christian, Erhard
name: Isaia, Marco
name: Paschetta, Mauro
name: Bruckner, Alexander
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Palpigradi
Eukoeneniidae
Eukoenenia
Eukoenenia roscia

description: Eukoenenia roscia Christian, species nova
(Figures 2, 5 F, 6, 9, 11, 12 F, 13 F, 14 F, 23–25)
Material examined. Holotype female: Italy, Piemonte, Province of Cueno, Rossana, Grotta delle Fornaci o di Rossana (44°32′02″N, 07°25′52″E, 554 m a.s.l.); 15 August 2012, leg. E. Lana. Two paratypes: 1 male, 1 female; same locality; 16 February 2012, leg. M. Morando & E. Lana. Additional material: 1 female; same locality; 3 March 2013, leg. E. Lana.
Deposition. Museum of Natural History, Vienna, Austria, Arachnological Collection. Acquisition numbers 21.881 (holotype), 21.882 (paratype male), 21.883 (paratype female).
Etymology. The Comune di Rossana derives its name from the Roman gens Roscia. The specific epithet roscia is used as a noun in apposition.
Diagnosis. A species with all characters of the E. spelaea complex, as described above. Body length over 1800 µm; each finger of chelicera with 8 teeth; lateral organ with 5–7 blades; 6 (5) deuto-tritosternal setae; articles I bta3 and IV bta slender; forked seta present on I bta4; proximal forked seta of I ta3 about same length as rod seta; males with more than 3+3 setae a on the sternites IV–VI (females often have 3+3); segment XI of opisthosoma with 10 setae.
Description. Morphometric data are given in Table 1 under ♀ 01, ♀ 02 (holotype) and ♂ 03.
General appearance. Body length without flagellum 1830–1960 µm. Shape and pubescence of trunk as in other members of E. spelaea complex. Trunk of living individuals orange reddish, particularly opisthosoma.
Prosoma. Frontal organ 39–42 µm long; the two lanceolate, reticulated branches have pointed tips. The 5–7 blades of the lateral organ (Fig. 6) are 42–44 µm long, pointed-lanceolate and finely reticulated (Fig. 5 F). Propeltidium with 10+10 setae, the shortest (30–31 µm) in central position, the longest (50–54 µm) laterally in posterior half. Setae t 1, t 2 and t 3 of metapeltidium 76–82, 127–135 and 84–100 µm long, respectively. Labrum with usual cuticular pattern and 5+5 short setae. Deuto-tritosternum with 6 (3 specimens) or 5 setae (1 specimen) of 43–50 µm. First article of chelicera with a proximal longitudinal series of 6 setae (p 4 and p 6 thick; p 4 sparsely barbed, p 6 partly serrate), a distal series of 3 aligned setae (d 3 strong, smooth near base, sparsely barbed in middle, closely barbed near tip, 2.5× length of d 1 and d 2) and 1 apical seta. Hand of chelicera with 7 setae: 4 in a dorsal line, 1 ventral, 1 close to articulation of movable finger, and 1 on a tubercle of the fixed finger. Fingers with 8 teeth each. Coxal chaetotaxy as described above for spelaea group. Near the tip of the pedipalp is a curved seta that looks like a long, strongly asymmetric forked seta; one typical fs is inserted somewhat behind. Leg I with 7 trichobothria in usual arrangement and a total of 8 forked setae. Ta3 of leg I has 4 fs in distal half, arranged as 1+1+2: fs 1 about same length as nearby rs; fs 2 inserted closer to cs in the three females, but closer to m in the single male. I bta3 very slender, length/width 3.23–3.52; compared to the similarly shaped I bta3 of E. strinatii, seta r of the new species is longer and more proximally inserted, at 42–46% of article length from base (Fig. 12 F vs. B, and Fig. 24, I bta3/ r and I bta3/d r). I bta4 bears, close to the insertion of the trichobothrium, one fs (Fig. 11; this forked seta is also present in E. spelaea from Partigiano and Griffen). IV bta slender, length/width 5.32–6.54, with 4 setae, these exhibiting some variation in length and insertion distance, but consistently r <grt <esd; tip of r does not project beyond distal end of the article (Fig. 13 F).
Opisthosoma. Anterior tergites with t 1, t 3, s on segment II, and usually t 1, t 2, t 3, s on III–VI. Seta t 2 absent in one female symmetrically on segment III and on the right side of IV. Sternites IV–VI each with a pair of submedian circular structures and lateral setae s 1 and s 2; females can have more than 3+3 submedian setae a at least on segment IV, the male has (4–)5 setae a on these sternites (Figs 6 & 14 F). The setation of the terminal segments (Table 3) is partly variable, but on segment XI all specimens (N = 4) have 10 setae about as long as the segment. The 2 dorsal setae on the intermediate ring of the flagellum are as long as the 2 ventral ones. Not even fragments of the flagellum are preserved.
Female genital area. First lobe has an evenly rounded or gently truncate apex, uniform pubescence and 7+3 setae on each side. The 7 setae on ventral area of lobe arranged in 4 transversal rows, 2–3–1–1 from base to tip (as in Fig. 16, left). The innermost of the 3 apical setae measures 23–28 µm; it is always slightly shorter than the others. Each half of second lobe possesses 3 setae. The total formula is thus 7+3/3.
Male genital area. Shape and phaneres of genital area as in E. strinatii (compare Figs 18 & 19), chaetotactic formula 2+9+2f/3/4. Base of deeply split first lobe lies behind a row of 2+2 sternal setae. The roundish lateral extension of each half carries 3 setae, the oblong submedian extension has 6 setae and, on the apical bend, 2 fusules (f 1, f 2) that are about the same length as the neighbouring setae. No sockets visible at roots of fusules. Second lobe furcates in its distal half into two triangular, pointed flaps, each of which carries 3 setae (a, b, c) near its base, with b being more proximally inserted than a. On the third lobe the two flaps branch off closer to the base and converge apically. They are broadly triangular, end in two parallel needles and have 4 setae: w, z, y, x (from base to tip).
description: Published as part of Christian, Erhard, Isaia, Marco, Paschetta, Mauro & Bruckner, Alexander, 2014, Differentiation among cave populations of the Eukoenenia spelaea species-complex (Arachnida: Palpigradi) in the southwestern Alps, pp. 52-86 in Zootaxa 3794 (1) on pages 75-79, DOI: 10.11646/zootaxa.3794.1.2, http://zenodo.org/record/4914649