Description

Redescription. Body length 1024 ± 32 µm (range: 963 – 1097; n = 19). Head 109 ± 5 µm long in dorsal view (range 94 – 116; n = 19); head setae short; setae sd 4 and sd 5 present, seta d 6 absent (Fig. 23). Single frontal pore anterior to the level of the pseudoculi. Rostrum very short. Pseudoculus almost circular, diameter 7 µm (range: 6 ‒ 8; n = 19), longitudinally divided (Fig. 24); PR = 15.3 (range 13.1 – 18.3, n = 19). Maxillary gland with a globular calyx and a distinct “ sock-shaped ” posterior dilation (Fig. 25), the proximal part 20 µm long (range: 19 – 22; n = 19), CF = 5.4 (range: 4.8 – 6.0; n = 19). Maxillary palpus with thin, pointed sensilla (Fig. 26). Labial palpus with three setae and large ovoid sensillum (Fig. 27). Foretarsus length 66 µm (range: 63 – 68; n = 19), claw 21 µm (range: 18 – 23; n = 16), without inner tooth, TR = 3.2 (range 2.7 – 3.6; n = 16); empodium length 6 µm (range: 5 – 7, n = 16), EU = 0.28 (range 0.24 – 0.38, n = 16); S-shaped seta as long as claw, 21 µm (range: 20 – 23; n = 16). Sensillum t 1 claviform, BS = 0.48 (range 0.41 – 0.51, n = 19); t 2 thin, t 3 large, leaf-like, subequal in length to t 1. Sensillum a short, not reaching base of d; sensillum b broad and very long, surpassing the base of claw; c reaching the base of d; sensilla e, f and g reaching the empodium, f nearer to e than to g. Sensillum a’ broad, sword shaped, reaching the base of b’; c' rather long and thin, its apex reaching the base of claw. Ventral seta β 1 slightly shorter than interior seta δ 4; δ 4 situated nearer to c’ than to b’ (Figs. 28 – 29). Foretarsal pore present near the base of sensillum c (Fig. 28). Middle tarsus length 26 µm (range: 22 – 28; n = 16); claw length 15 µm (range: 13 – 16; n = 15). Hind tarsus length 30 µm (range: 27 – 33; n = 15); claw length 16 µm (range: 13 – 18; n = 15). Thoracic tergite I (Fig. 30) with two pairs of setae (ratio setae 1: 2 = 1.54: 1; range 1.33 ‒ 1.75; n = 19) (Table 3). Thoracic tergites II and III (Fig. 30) each with two pairs of anterior setae (A 2, A 4); seta P 1 a very short; seta P 2 a short, present on mesonotum, nearer to P 3 than to P 2, absent on metanotum. Seta P 5 very short. Length ratio of setae P 1: P 2 on mesonotum as 1: 1.5 (range 1.3 – 1.6, n = 19). Tergite I with three pairs of anterior setae (A 1, A 2, A 5); seta A 5 very short; seta P 3 short; setae P 1 a, P 3 a, P 4 a and P 5 absent. Tergites II – V each with three pairs of anterior setae (A 1, A 2, A 5); setae P 1 a and P 3 a absent (Table 3). Seta A 4 present on tergite VI. Seta P 3 in urotergites II ‒ VI anterior to line P 2 ‒ P 4. Tergite VII (Fig. 31) with 3 pairs of anterior setae (A 2, A 4, A 5); P 3 a present. Tergite VIII (Fig. 32) with 3 pairs of anterior setae (A 2, A 4, A 5); P 1 a absent. Setae P 2 a on tergites V ‒ VII very short, close to P 2. Tergites IX and X with 12 setae; tergites XI and XII with 4 and 9 setae, respectively (Fig. 32). Prosternum (Fig. 33) formula 2 + 4 / 6 (A 1 + M 1, 2 / P 1, P 2, P 3), mesosternum and metasternum (Fig. 34) formulas 5 + 2 / 4 and 7 + 2 / 4, respectively. Sternites I – VII with 3 anterior setae (Fig. 35); sternites VIII ‒ XI with 4 setae; sternite XII typically with 6 setae (Fig. 36). Thoracic tergites II and III with sl pores (Table 4). Tergites I ‒ VIII with psm pores; al pores on tergites II ‒ VII; psl pores on tergites VI ‒ VII (Fig. 31). Tergite XII with ac pore (Fig. 32). Thoracic sternites and abdominal sternites I ‒ IV without pores. Sternites V ‒ VII each with asymmetrical spsm pore near the base of seta P 1; sal pores on sternites V and VI (Fig. 35); sternite XII with sal pores (Fig. 36). Connecting lines on anterolateral corners of sternites IV – VI absent. Abdominal appendages II and III with long subapical seta and very short apical median seta. Striate band on Abd. VIII complete, with distinct striae (Figs. 32, 36); comb with 9 – 12 small and nearly regular teeth (Fig. 37). Irregular row of minute granules just posterior to striate band. Penis with 5 + 5 setae (Fig. 38). Female squama genitalis distinctly tripartite with pointed acrostylus (Fig. 39). Chaetotaxic variation infrequent; symmetrical and asymmetrical absence of seta P 2 a on thoracic tergite II (one adult in both cases); asymmetrical absence of seta A 4 on tergite VI (one adult); asymmetrical absence of seta A 1 on tergite V (one adult); symmetrical and asymmetrical absence of seta 1 on tergite IX (one adult in both cases); asymmetrical presence of a long seta between P 2 and P 3 on sternite VI (one adult); presence of only 3 setae on sternite IX. On holotype seta P 2 a on metanotum nearer to seta P 3 than to P 2. Imago and Pre-imago Maturus Junior Larva II Formula Complementary Setae Formula Complementary Setae Dorsal * Seta P 2 a present only in the holotype. Pre-imago. Length of body 889, 895 µm (n = 2), head 97, 100 µm, foretarsus length 62, 64 µm, TR = 3.4, 3.5, BS = 0.48, 0.52. Chaetotaxy and porotaxy identical to those of adults (Tables 3, 4). Maturus junior. Length of body 752 ± 17 µm (range: 742 – 771; n = 3), head 90 ± 6 µm (range: 84 – 96; n = 3), foretarsus length 55 ± 4 µm (range: 52 – 60; n = 3), TR = 3.3, BS = 0.51 ‒ 0.57. Chaetotaxy (Table 3) differing from that of adults in absence of seta A 4 on tergite VI, absence of setae 1 a and 2 a on tergite X, absence of setae on sternite XI. Larva II. Length of body 666 ± 21 µm (range: 643 – 683; n = 3), head 80 ± 6 µm (range: 73 – 83; n = 3), foretarsus length 48 ± 1.5 µm (range: 47 – 50; n = 3), TR = 2.8 – 3.6. Chaetotaxy is shown in Table I.

Common Names

No common names available.

Taxonomic Hierarchy

Kingdom: Animalia

Phylum: Arthropoda

Class: Protura

Order: Protura

Family: Acerentomidae

Genus: Acerentulus

Species: Podolinella ruseki (Nosek, 1967) Nosek, 1967