Spinaethorax Papáč & Palacios-Vargas, 2016

Schneider, Clément & Deharveng, Louis, 2017, First record of the genus Spinaethorax Papáč & Palacios-Vargas, 2016 (Collembola, Neelipleona, Neelidae) in Asia, with a new species from a Vietnamese cave, European Journal of Taxonomy 363, pp. 1-20 : 3-4

Genus Spinaethorax Papáč & Palacios-Vargas, 2016 Figs 1–8 , 9A, D ; Table 1

Revised diagnosis

Eyes and post-antennal organ absent. Secondary granulation made of fine grains; dermastra missing; integumentary channels absent. Anterior process of labrum absent or very weak. Ant. III and IV fused; S-chaeta S1 short and wide; S-chaeta S5 present; two apical sensory rod-like chaetae (a, sa). Basomedian fields of labium with 4 + 4 chaetae; basolateral fields of labium with 3 + 3 chaetae. Oral fold with enlarged lateral chaeta. Sensory fields well-developed with swollen inner chaetae; sf6 with three guard chaetae. Trunk with 4 + 4 s-chaetae (s1, s2, s3, s3’). Abd. IV sternum with 1 + 1 neosminthuroid chaetae. Distal articular process of manubrium with convex tip. Dens without median articular process. Unguis with basal narrowing; with well developed lamella Bp; lamella la missing on unguis II. Tenaculum with 3 + 3 teeth.

Keys or tables for determination of the genera of Neelidae are available in Papáč & Palacios-Vargas (2016) and Schneider (2017).

Figures

Fig. 1. Spinaethorax adamantis sp. nov., habitus, with enlargement of the protuberance bearing wax rod secretory element of sf6.

Fig. 2. Spinaethorax adamantis sp. nov. A–B. Chaetotaxy of the head. A. Dorsal side. B. Ventral side, anterior part. C. Labrum dorsal side. D–F. Labium. D. Focus on papillate chaetae of the palp. E. Focus on chaetae in proximal field. F. focus on papilla H. G–H. Maxilla, different views. I. Left mandible. J–K. Maxilla outer lobe. J. Lateral side. K. Ventral side. Abbreviations: blf = basolateral field of labium; bmf = basomedian field of labium; mol = maxilla outer lobe; of = oral fold. Labial palp lettering after Fjellberg (1999).

Fig. 3. Spinaethorax adamantis sp. nov. A–D. Chaetotaxy of the antenna. A. Dorsal side. B. Ventral side. C. Focus on S-chaeta Sx and Organite Or with enlargement of the latter. D. S-chaeta S1, different aspects. Asterisks indicate modified chaetae. Chaetae implanted on the other side represented with gray stroke.

Fig. 4. Spinaethorax adamantis sp. nov. A. Chaetotaxy of the trunk. B. Focus on the τ-chaetae (asterisks link τ-chaetae in A and B). C. Focus on s-chaeta s2. D. Focus on the neosminthuroid chaeta. Secondary granulation of Th.II–Abd.V terga partially shown (anterior, ventral and posterior limits, also limits near sensory fields and wrc1–8).

Fig. 5. Spinaethorax adamantis sp. nov. A–C. Chaetotaxy of legs. A. Leg I with focus on apical chaetae of tibiotarsus, asterisk indicates a special chaeta. B. Leg II (also with sf4 on Th. II precoxal area). C. Leg III (also with sf5 on Th. III precoxal area). D–G. Morphology of claws. D. Claw I posterior side. E. Claw I anterior side. F. Claw II posterior side. G. Claw III posterior side.

Fig. 6. Spinaethorax adamantis sp. nov. A–B. Male sexual apparatus. A. Male genital plate (asterisk indicates a chaetanot seen on otherside, possiblyunpaired).B. Immature male genital plate.C. Manubrium/ dens anterior articular process. D. Chaetotaxy of manubrium and dens posterior side. E. Distal part of dens and mucro anterior side. F. Mucro posterior side. G–H. Tenaculum. H. Focused on apical teeth and basal process. I. Ventral tube lateral side.

Fig. 7. Spinaethorax adamantis sp. nov. A–B. Diagram of the chaetotaxy of the head: A dorsal side, B ventral side. C. Diagram of the chaetotaxy of the trunk. Enlarged or lanceolate chaetae with thicker line. Nomenclature of chaetotaxy after Schneider & D’Haese (2013), Schneider et al. (2016) and Schneider (2017), partial equivalence with head nomenclature of S. tonoius (Palacios-Vargas & Sánchez 1999) is given in A (IL1–5 chaetae).

Fig. 8. Spinaethorax adamantis sp. nov., partial diagram of the chaetotaxy of the antenna (Ant. III/Ant. IV).

Fig. 9. A. Schematic interpretation of the labrum of Spinaethorax adamantis sp. nov. B–F. Chaetotaxic organization of sf6. B. Neelus murinus. C. Megalothorax minimus. D. Spinaethorax adamantis sp. nov. E. Megalothorax granulosus. F. Acanthoneelidus pratensis. G–L. Outline of claw III, normalized in length, of representatives of the six genera of Neelipleona. G. Spinaethorax adamantis sp. nov. H. Neelus murinus. I. Megalothorax minimus. J. Zelandothorax novaezealandiae. K. Neelides folsomi. L. Acanthoneelidus pratensis. H, I, K, L after Schneider (2017), J after Bonet (1947).