Liacarus (Liacarus) neonominatus Subías, 2004

Liacarus (Liacarus) neonominatus Subías, 2004 View in CoL

(syn.: Dorycranosus arcticus Grishina, 1984 , preoccupied by Banks (1899))

Material

Two specimens (two males): Russia, Western Siberia , Yamal Peninsula, near Lake Yaroto-1, shrub-lichen tundra, 67°51'34.61" N, 71°5'27.45" E, practically undisturbed moist soil (locality 2, Figs. 1, 2 View Figures 1–3 ), 10.viii.2024 (А. V. Soromotin) GoogleMaps ; six specimens (five males and one female): the same, but dry loamy sand (locality 3, Fig. 3 View Figures 1–3 ).

All specimens (preserved in 70% solution of ethanol with a drop of glycerol) are deposited in the collection of the University of Tyumen, Museum of Zoology , Tyumen, Russia .

Supplementary description ( Figs. 4–28 View Figures 4–5 View Figures 6–12 View Figures 13–16 View Figures 17–20 View Figures 21–24 View Figures 25–28 )

Measurements – Body length: 555–585 (seven males), 630 (one female); notogaster width: 390– 420 (seven males), 480 (one female).

Integument ( Figs. 4, 5 View Figures 4–5 , 20 View Figures 17–20 , 23, 24 View Figures 21–24 , 26 View Figures 25–28 ) – Body brown. Surface densely microsculpturing tuberculate (visible under high magnification in dissected specimens); lamella and dorsal part of tutorium longitudinally striate; lateral side of body partially with microgranulate cerotegument.

Prodorsum ( Figs. 4–6, 8, 9 View Figures 4–5 View Figures 6–12 , 17–24 View Figures 17–20 View Figures 21–24 ) – Rostrum with median rectangular ledge bordered by two deep incisions and with several (six to eight) lateral teeth (anterior tooth is largest). Lamella (excluding cusp) shorter than half of prodorsum; lamellar cusp slightly shorter than basal part of lamella, distally with strong inner tooth and small lateral outer tooth (sometimes reduced); cusps clearly separated medially, parallel or slightly divergent, connected mediobasally by one small interlamellar tooth. Rostral (52–56) and lamellar (71–75) setae rod-like, barbed; lamellar seta inserted in distal part of lamellar cusp; interlamellar seta (26–28) distinctly thinner than rostral and lamellar setae, setiform, slightly barbed; bothridial seta (34–41) with short exposed stalk and longer, fusiform (narrowed or pointed distally), slightly barbed head; in some specimens, bothridial head has apical spike; exobothridial seta not observable. Tutorium long, ridge-like, directed to rostrum, continue lateral and near the insertion of rostral seta.

Notogaster ( Figs. 4 View Figures 4–5 , 6, 7 View Figures 6–12 , 17–21 View Figures 17–20 View Figures 21–24 , 25 View Figures 25–28 ) – Eleven pairs of notogastral setae (28–34) setiform, smooth; each seta inserted on small tubercle. Opisthonotal gland opening and all lyrifissures well observable.

Gnathosoma ( Figs. 10–12 View Figures 6–12 ) – Subcapitulum size: 154–169 × 86–90; subcapitular setae (a, h: 30– 34; m: 37–41) setiform, slightly barbed; both adoral setae (26–30) setiform, barbed. Palp length: 90– 97; setation: 0-2-1-3-9(+ω); postpalpal seta (7–9) spiniform, smooth. Chelicera length: 154–169; cheliceral setae (cha: 52–56; chb: 37–41) setiform, barbed.

Epimeral and lateral podosomal regions ( Figs. 5 View Figures 4–5 , 6 View Figures 6–12 , 19 View Figures 17–20 ) – Epimeral setal formula: 3-1-3-3; setae 1a, 2a, 3a (17–19) setiform, smooth, others (1b, 3b, 3c: 30–34; 1c, 4a, 4b, 4c: 26–28) setiform, slightly barbed; 1a, 2a, 3a, 3c inserted on distinct tubercles, others on slight tubercles. Circumpedal carina distinct.

Anogenital region ( Figs 5–7 View Figures 4–5 View Figures 6–12 , 19 View Figures 17–20 , 26 View Figures 25–28 ) – Anogenital setal formula: 6-1-2-3; genital (17–19), anal (30–34) and adanal (30–34) setae setiform, erect, smooth; all adanal setae inserted on slight tubercles; both aggenital setae (30–34) setiform, erect, slightly barbed. Adanal lyrifissure transverse.

Legs ( Figs. 13–16 View Figures 13–16 , 19 View Figures 17–20 , 21 View Figures 21–24 , 27, 28 View Figures 25–28 ) – Median claw thicker than lateral ones, all slightly barbed on dorsal side. Dorsoparaxial porose area on all femora and on trochanters III, IV distinct. Formulas of leg setation and solenidia: I (1-5-3-4-20) [1-2-2], II (1-4-2-4-16) [1-1-2], III (2-3-1-3-15) [1-1-0], IV (1-2-2-3-12) [0-1-0]; homology of setae and solenidia indicated in Table 1; seta s on tarsus I eupathidial, located between paired setae u and a; solenidia ω 1 and ω 2 on tarsi I, II and σ on genu III rod-like, rounded apically, other solenidia setiform to subflagellate.

parentheses refer to a pair of setae.

Diagnosis

Based on our supplementary description and on the original description ( Grishina 1984) of adult L. neonominatus , we propose the following diagnostic morphological traits for this species:

Body length: 522–665. Surface microsculpturing tuberculate; lamella striate. Rostrum with median rectangular ledge, two incisions and several lateral teeth. Lamellar cusp distally with strong inner tooth and small outer tooth (sometimes reduced); cusps separate medially, connected mediobasally by small tooth. Rostral and lamellar setae medium-sized, rod-like, barbed; interlamellar seta short, setiform, slightly barbed; bothridial seta short, fusiform (sometimes with apical spike), slightly barbed, with head longer than stalk. All notogastral setae short, setiform, smooth, inserted on tubercles. All epimeral and anogenital setae short, setiform. Adanal lyrifissure transverse.