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FIGURE 15. Antenna, genus Megalothorax. M in Morphological review of the order Neelipleona (Collembola) through the redescription of the type species of Acanthoneelidus, Neelides and Neelus

FIGURE 15. Antenna, genus Megalothorax. M. nigropunctatus (A) posterior side, (B) anterior side modified after Schneider & D'Haese (2013); M. perspicillum (C) posterior side, (D) anterior side modified after Schneider & D'Haese (2013), (E) dorsal side; M. svalbardensis (F) posterior side, (G) anterior side. Scale bar (E) = 10 µm.

FIGURES 31–35 in Two new «nosed» species of the genus Megalothorax (Collembola: Neelidae) from Russia

FIGURES 31–35. Megalothorax processus sp. nov.: 31—body chaetotaxy, lateral view; 32—claw III, lateral view; 33— unguiculus I, posterior view; 34—claw I, anterior view; 35—rami of tenaculum (variation). Abbreviations as in Figs 9–12.

FIGURES 9–12 in Two new «nosed» species of the genus Megalothorax (Collembola: Neelidae) from Russia

FIGURES 9–12. Megalothorax roseus sp. nov.: 9—body chaetotaxy, lateral view; 10–12—furca, lateral (10), anterior (11), and posterior (12) view; 12—furca, posterior view. Abbreviations as in Fig. 7.

FIGURES 13–17 in Two new «nosed» species of the genus Megalothorax (Collembola: Neelidae) from Russia

FIGURES 13–17. Megalothorax roseus sp. nov.: 13–15—legs I (13), II (14), and III (15), lateral view; 16—claw III, anterior view; 17—unguiculus I, posterior view.

FIGURES 36–37. Altai habitats for M in Two new «nosed» species of the genus Megalothorax (Collembola: Neelidae) from Russia

FIGURES 36–37. Altai habitats for M. roseus sp. nov. (36, Kuznetsky Alatau ridge) and M. processus sp. nov. (37, entrance to Chuyskaya basin).

FIGURES 7–8 in Two new «nosed» species of the genus Megalothorax (Collembola: Neelidae) from Russia

FIGURES 7–8. Megalothorax roseus sp. nov.: 7—body chaetotaxy, dorsal view; 8—antenna, dorsal and ventral views. sf— sensory field, s1, s2—swollen sensilla on body, wrc—wax-rods (this is the same free wax rod generating crypt as in Schneider et al. 2013), S—S-chaetae, thickened chaetae on Ant. III–IV; Sy, Sa, Sx, a, Or—sensory organ.

FIGURES 24–26 in Two new «nosed» species of the genus Megalothorax (Collembola: Neelidae) from Russia

FIGURES 24–26. Megalothorax processus sp. nov. and M. roseus sp. nov.: 24–25—antenna, dorsal (24) and ventral (25) views; 26—diagram of the chaetotaxy of the antenna for M. roseus and M. processus. Abbreviations as in Fig. 8.

FIGURES 2–6 in Two new «nosed» species of the genus Megalothorax (Collembola: Neelidae) from Russia

FIGURES 2–6. Megalothorax roseus sp. nov.:2—forehead, front view; 3—chaetae of labrum, front view; 4—labrum, labium, postlabial area, and maxillary palp; 5—head, dorsal view; 6—forehead, lateral view. Ant. —antenna, ia—inter-antennal position, a0—unpaired chaetae on forehead, sf—sensory field, pr.l.—pre-labral, pr.a.—pre-antennal, cl.a.—clypeal anterior, cl.m.—clypeal median, cl.p.—clypeal posterior, f.p.—frontal posterior, f.m.—frontal median, f.a.—frontal anterior, pa.p.p— postantennal posterior, pa.a.—postantennal anterior, mol—maxillary outer lobe, sh—possible location of sublobal hair, A–E: labial papillae, b,d,e—accessory papillae, H, h1, h2—hypostomal chaetae, f.p.w.—four papilla wart.

FIGURE 1 in Two new «nosed» species of the genus Megalothorax (Collembola: Neelidae) from Russia

FIGURE 1. Records of the two new species: black circles—M. roseus sp. nov., quadrates—M. processus sp. nov.

FIGURES 18–23 in Two new «nosed» species of the genus Megalothorax (Collembola: Neelidae) from Russia

FIGURES 18–23. Megalothorax processus sp. nov.: 18—chaetotaxy of forehead, front view; 19—maxillary outer lobe (mol) with one sublobal hair (sh); 20—labrum, front view; 21—labial palp; 22—head, dorsal view;23—forehead, lateral view. c.p.— cuticular process. Other abbreviations, as in Figs 2–6.

FIGURES 2–5 in New species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from a superficial subterranean habitat at Dobšinská Ice Cave, Slovakia

FIGURES 2–5. Megalothorax dobsinensis sp. n.: 2, head, dorsal side; 3, outer lobe of maxilla; 4, left mandibula; 5, ventral side of head with labium and connection of epicuticular channels with linea ventralis.

FIGURE 17 in New species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from a superficial subterranean habitat at Dobšinská Ice Cave, Slovakia

FIGURE 17. Megalothorax dobsinensis sp. n.: 17, diagram of ventral chaetotaxy of head and cuticular channels.

FIGURE 1. A in New species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from a superficial subterranean habitat at Dobšinská Ice Cave, Slovakia

FIGURE 1. A, Dobšinská Ice Cave, entrance: collapse doline (Photo: Ľ. Kováč); B, Dobšinská Ice Cave, cold site at the cave entrance: limestone scree covered by soil, leaves and pioneer vegetation, mostly mosses and liverworts (Photo: Ľ. Kováč); C, Harmanecká Cave, entrance morphology (Photo: Ľ. Kováč); D, Harmanecká Cave, Izbica Hall, twilight zone, limestone scree on the bottom partly covered with sediment, algae, cyanobacteria and mosses (Photo: P. Fenďa).

FIGURES 12–14 in New species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from a superficial subterranean habitat at Dobšinská Ice Cave, Slovakia

FIGURES 12–14. Megalothorax dobsinensis sp. n.: 12, part of the leg I; 13, part of the leg II; 14, part of the leg III.

FIGURES 10–11 in New species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from a superficial subterranean habitat at Dobšinská Ice Cave, Slovakia

FIGURES 10–11. Megalothorax dobsinensis sp. n.: 10, antenna, dorsal view (S-chaetae S2, S3 on Ant. III enlarged); 11, furca, posterior view.

FIGURES 26–27 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 26–27. Megalothorax carpaticus sp. nov.: 26, right antenna, dorsal view (sensillum of Ant. III organ and apical organite enlarged); 27, furca, posterior view, a—lateral view of mucro.

FIGURES 13–16 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 13–16. Megalothorax tatrensis sp. nov.: 13, leg I; 14, leg II; 15, leg III; 16, unguis and unguiculus of leg I.

FIGURES 1–6 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 1–6. Megalothorax tatrensis sp. nov.: 1, head, dorsal side; 2, anterior part of head with labrum, chaetae of anterior row enlarged; 3, mandible; 4, head of maxilla; 5, maxillary outer lobe, o.f.—oral fold, b.s.—basal chaeta, sl.h.— sublobal hair, t.h.—terminal hair; 6, ventral side of head with labium and connection of integumentary channels with linea ventralis, b.f.l.—basolateral field of labium.

FIGURES 36–38 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 36–38. Megalothorax hipmani sp. nov.: 36, chaetotaxy and arrangement of sensory fields on thorax and abdomen, a—sensillum s3 enlarged, b—abdominal sensory field (enlarged), c—Abd. V–VI with anal valve and female genital plate (enlarged, av—anal valve chaetae), d—sensory field at leg III base (enlarged), e—sensory field at leg II base (enlarged), f—thoracal sensory field (enlarged); 37, tubus ventralis; 38, retinaculum.