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FIGURES 11–12 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 11–12. Megalothorax tatrensis sp. nov.: 11, right antenna, dorsal view (sensillum of Ant. III organ and apical organite enlarged); 12, furca, posterior view.

FIGURES 32–35 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 32–35. Megalothorax hipmani sp. nov.: 32, head, dorsal side; chaetae of anterior row enlarged; 33, mandible from two different views; 34, maxillary outer lobe; 35, ventral side of head with labium and connection of integumentary channels with linea ventralis.

FIGURES 22–25 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 22–25. Megalothorax carpaticus sp. nov.: 22, chaetotaxy and arrangement of sensory fields on thorax and abdomen, a—abdominal sensory field (enlarged), b—Abd. V–VI with anal and female genital field (av—anal valve chaetae), c—sensory field at leg III base (enlarged), d—sensory field at leg II base (enlarged), e—thoracal sensory field (enlarged); 23, tubus ventralis; 24, retinaculum; 25, male genital plate.

FIGURES 7–10 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 7–10. Megalothorax tatrensis sp. nov.: 7, chaetotaxy and arrangement of sensory fields on thorax and abdomen, a—thoracal sensory field (enlarged), b—sensory field at leg II base (enlarged), c—sensory field at leg III base (enlarged), d—abdominal sensory field (enlarged); 8, tubus ventralis; 9, retinaculum; 10, Abd. V–VI with anal and female genital field, Abd. VI te—tergum, Abd. VI st—sternum, gp—genital plate, ns—neosminthuroid chaetae, avanal valve chaetae.

FIGURES 58–61 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 58–61. Integumentary channels on head: 58, Megalothorax tatrensis sp. nov.—dorsally; 59, Megalothorax carpaticus sp. nov.—dorsally, a—ventrolateral view of head with integumentary channels; 60, Megalothorax hipmani sp. nov.—on headback; 61, Megalothorax draco sp. nov.—dorsally and laterally on headback.

FIGURES 28–31 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 28–31. Megalothorax carpaticus sp. nov.: 28, leg I; 29, leg II; 30, leg III; 31, unguis and unguiculus of leg I.

FIGURES 54–57 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 54–57. Megalothorax draco sp. nov.: 54, leg I; 55, leg II; 56, leg III; 57, unguis and unguiculus of leg I.

FIGURES 17–21 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 17–21. Megalothorax carpaticus sp. nov.: 17, head, dorsal side, chaetae of anterior row enlarged; 18, mandible; 19, maxillary outer lobe; 20, head of maxilla; 21, ventral side of head with labium and connection of integumentary channels with linea ventralis.

FIGURES 50–51 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 50–51. Megalothorax draco sp. nov.: 50, chaetotaxy and arrangement of sensory fields on thorax and abdomen, a—sensory field at leg III base (enlarged), b—sensory field at leg II base with sensillum s1 (enlarged), cthoracal sensory field (enlarged), d—tubus ventralis, e—retinaculum, f—Abd. V–VI with anal valve, female genital plate and neosminthuroid chaetae (enlarged), g—abdominal sensory field (enlarged), h—sensillum s3 enlarged, av—anal valve, gp—genital plate, ns—neosminthuroid chaetae; 51, male genital plate.

FIGURES 41–44 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 41–44. Megalothorax hipmani sp. nov.: 41, leg I; 42, leg II; 43, leg III; 44, unguis and unguiculus of leg I.

FIGURES 39–40 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 39–40. Megalothorax hipmani sp. nov.: 39, left antenna, dorsal view (apical organite of Ant. IV enlarged, position marked with star); 40, furca, posterior view.

FIGURES 52–53 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 52–53. Megalothorax draco sp. nov.: 52, right antenna, dorsal view (sensillum of Ant. III organ and apical organite enlarged); 53, furca, posterior view, a—lateral view of mucro.

FIGURES 45–49 in Four new troglobiotic species of the genus Megalothorax Willem, 1900 (Collembola: Neelipleona) from the Carpathian Mountains (Slovakia, Romania)

FIGURES 45–49. Megalothorax draco sp. nov.: 45, head, dorsal side; chaetae of anterior row enlarged; 46, head of maxilla, different views; 47, maxillary outer lobe; 48, mandible; 49, ventral side of head with labium and connection of integumentary channels with linea ventralis.

FIGURE 1 in A new group of species of the genus Megalothorax (Collembola, Neelidae) with Gondwanan distribution, and introducing an open interactive identification key of Megalothorax species

FIGURE 1. Megalothorax anterolenis sp. nov. (A) Chaetotaxy of trunk tergites from Th. I to Abd. IV, with representation of the secondary granulation. (B, C, D) Head, (B) dorsal side including labrum and maxillary palp, (C) ventral side including labium basal fields, (D) variant morphology of the connection between linea ventralis and integumentary channels.

FIGURE 6 in A new group of species of the genus Megalothorax (Collembola, Neelidae) with Gondwanan distribution, and introducing an open interactive identification key of Megalothorax species

FIGURE 6. Megalothorax zealanterolenis sp. nov. (A) Chaetotaxy of trunk tergites from Th. I to Abd. V, (B) Head dorsal side. (C) Mandibula. (D) Antenna.

FIGURE 5 in A new group of species of the genus Megalothorax (Collembola, Neelidae) with Gondwanan distribution, and introducing an open interactive identification key of Megalothorax species

FIGURE 5. Megalothorax tasmanterolenis sp. nov. (A) Chaetotaxy of antenna, arrow indicates a facultative chaeta. (B) Claw I. (C) Claw II. (D) Claw III. (E) Furca posterior side.

FIGURE 9 in A new group of species of the genus Megalothorax (Collembola, Neelidae) with Gondwanan distribution, and introducing an open interactive identification key of Megalothorax species

FIGURE 9. Megalothorax tasmanterolenis sp. nov. (A) Integument with secondary granules and area of enlarged primary hexagons devoid of secondary granules, abdominal region dorsal side. (B) Integument, with area of enlarged primary granules, dorso-anterior part of head. (C) Enlarged and clear S-chaeta Sa2 on Ant. IV, compared with (D) normal, dark S-chaetae (e.g. Sb3, Sb4, Sb5) on Ant. IV. Megalothorax zealanterolenis sp. nov. (E) mucro with focus on the smooth and waved internal posterior lamella.

FIGURE 4 in A new group of species of the genus Megalothorax (Collembola, Neelidae) with Gondwanan distribution, and introducing an open interactive identification key of Megalothorax species

FIGURE 4. Megalothorax tasmanterolenis sp. nov. (A) Chaetotaxy of trunk tergites from Th. I to Abd. IV, area of repartition of the secondary granulation represented in grey, (B) Head dorsal side. (C, D) anterior side of the labrum anterior process, (D) labrum posterior side. (E) Maxillary outer lobe. (F) Mandibula. (G) Maxilla.

FIGURE 2 in A new group of species of the genus Megalothorax (Collembola, Neelidae) with Gondwanan distribution, and introducing an open interactive identification key of Megalothorax species

FIGURE 2. Megalothorax anterolenis sp. nov. (A, B) Labrum anterior process, (A) posterior side, (B) anterior side. (C) Maxillary outer lobe internal side. (D) Mandibula. (E) Maxilla. (F, G) Antenna (F) posterior side, (G) anterior side. (H) Abd. VI tergite and sternite, Abd. V and IV sternites, and posterior side of manubrium and dens (furca), chaeta and lobe in dotted line are missing on the figured specimen but normally present. (I) dens anterior side. (J) Mucro.

FIGURE 8 in A new group of species of the genus Megalothorax (Collembola, Neelidae) with Gondwanan distribution, and introducing an open interactive identification key of Megalothorax species

FIGURE 8. (A) Diagram of dorsal head chaetotaxy, chaeta in blue present only in M. tasmanterolenis sp. nov. and M. zealanterolenis sp. nov., channel in blue present only in M. tasmanterolenis sp. nov. (B) Diagram of ventral head chaetotaxy. (C) Diagram of antenna chaetotaxy. (D) Body chaetotaxy diagram, s-chaetae shape based on M. anterolenis sp. nov. (E) Connection of integumentary channels and linea ventralis: (a) crossed, (b) transitional form, (c) circular.