Drepanura polychaeta, Ma, Yitong, Chun, Zhao & Greenslade, Penelope, 2015

Ma, Yitong, Chun, Zhao & Greenslade, Penelope, 2015, The genus Drepanura (Collembola: Entomobryidae) in Australia: descriptions of two new species and redescriptions of five known species, Zootaxa 4058 (3), pp. 373-387 : 376-378

Drepanura polychaeta sp. nov.

Figs 21−35

Types. Holotype: female, Australia, Barrow Island, 20o 45’S 115o 25’E, 2005/2006, collected by S. Callan. Paratype: 6 females, same data as holotype. All deposited in SAM.

Description. Body length up to 2.5mm.

Ground colour yellow in alcohol. Eye patch and antennae blue-black. Anterior and lateral margins of head with dark blue pigment. Blue pigment also present on legs except tibiotarsi. A narrow longitudinal strip present on midline from Th. II −Abd. II. Abd. II −V with irregularly patches ( Fig. 21 ).

Antenna 0.7−0.8 times as long as body. Antennal segmental ratio in length as I:II:III:IV = 1:1.4−1.7:1.1−1.7:1.5−2.6. Dorsal cephalic chaetotaxy with 4 antennal (An1, An2, An3a1, An3), 2 median (M2, M4) and 7 sutural (S0, S2, S3, S4, S 4i, S5, S 5i) macrochaetae ( Fig. 22 ). Eyes 8+8, G and H smaller. Interocular chaetae as p, q, r, s, t or p, q, r, v, s, t, p chaeta larger than others ( Fig. 23 ). Labral and prelabral chaetae as 4/5, 5, 4; prelabral ones ciliate, others smooth; subapical labral papillae 4, each with 3−4 secondary apical spinules ( Fig. 24 ). Labial triangular chaetae as in fig. 25, 3 chaetae present between M and E, all finely ciliate.

Dorsal macrochaetae shown as in Fig 26 . Th. II with 2 (m1, m2) macrochaetae in Mm area and 4 (m 4i, m4, m4p, a5) macrochaetae in Ms area. Th. III with 4 (a1, a2, a2a, a3) macrochaetae in Am area and 8(9) (a 4i 2, a 4i, a4, a5, m 5i, m5, rarely a5e, 2 unknown) macrochaetae in As area. Trochanteral organ with 30−33 smooth spiny chaetae ( Fig. 27 ). Tibiotarsus with inner differentiated ciliate chaetae, most distal one on hind leg smooth. Tenent hair thick with tip clavate, 1.2−1.6 × length of inner side of unguis. Unguis with 4 inner teeth, first pair at 0.4 distance from base of claw, and 2 unpaired teeth, first one at 0.7 and distal one at 0.8 distance from base respectively. Unguiculus acuminate with outer edge serrate ( Fig. 28 ).

Abd. IV 4.5−8.5 times as Abd. III in length along dorsal midline. Dorsal macrochaetae shown in Figs 29−30 . Abd. I with 19 central and 2−5 lateral macrochaetae on each side. Abd. II with 16−18 central and 5−8 lateral macrochaetae. Abd. III with 1 central (m3) and 3 lateral (am6, pm6, p6) macrochaetae ( Fig. 29 ). Abd. IV with 53−61 central and 27−38 lateral macrochaetae ( Fig. 30 ). Tenaculum with 4 teeth and 1 long ciliate chaeta ( Fig. 31 ). Ventral tube anteriorly with 20 ciliate chaetae of different sizes ( Fig. 32 ), laterally with 8 smooth chaetae and 1 ciliate chaeta ( Fig. 33 ). Manubrial plaque with 5 ciliate chaetae and 2 pseudopores on each side ( Fig. 34 ). Dens without spines, uncrenulated part 1.6−2.3 times as mucro in length. Mucro falcate and tip of basal spine not reaching apex of the tooth ( Fig. 35 ).

Etymology. Named because of the large number of macrochaetae on abdomen.

Remarks. This species is close to the Australian species D. albocoerulea ( Schött, 1917) in colour pattern of the abdomen, but the body chaetotaxy is different ( Table 1 ). It is also similar to the Russian species D. montana Martynova & Chikatunov, 1968 , but each labral papilla has 3−4 secondary apical spinules in D. polychaeta sp. nov. and only one in D. montana .

Figures

FIGURES 21 − 35. Drepanura polychaeta sp. nov.: 21, habitus; 22, dorsal chaetotaxy of head; 23, eyes and interocular chaetotaxy; 24, labrum; 25, labium; 26, chaetotaxy of Th. II − III; 27, trochanteral organ; 28, foot complex; 29, chaetotaxy of Abd. I − III; 30, chaetotaxy of Abd. IV; 31, tenaculum; 32, anterior face of ventral tube; 33, lateral flap of ventral tube; 34, plaque of manubrium; 35, mucro.