Willowsia zhaotongensis, Chai, 2017

Chai, Rui & Ma, Yitong, 2017, Two new species of Willowsia (Collembola: Entomobryidae) from Yunnan Province, China, European Journal of Taxonomy 311, pp. 1-12 : 6-10

Willowsia zhaotongensis sp. nov.

urn:lsid:zoobank.org:act:C1D8D5E5-3BF2-4726-B875-2B729F0DB073

Figs 4−6 ; Table 2

Diagnosis

Dorsal part of Abd. II & III and median and posterior parts of Abd. IV central with blue pigments; Abd. I usually with 4+4 mac; Abd. II with 4−5 + 4−5 dorso-central mac; Abd. III with 3+3 dorso-central and 5+5 lateral mac; spinulate type scales present on Ant. I, head, body, legs, ventral tube and ventral side of manubrium.

Etymology

The specific epithet refers to the type locality: Zhaotong City.

Type material

Holotype

CHINA: ♀, on slide, collected in Yuanlong Village, Yongfeng Town, Zhaoyang District , Zhaotong City , Yunnan Province, rotten stems of maize, 1 Aug. 2014, Fudong Ding leg. (collection number 1149, Nantong University).

Paratypes

CHINA: 7 ♀♀ on slides, 4 ♀♀ in alcohol, same data as holotype.

Description

COLOUR PATTERN. Body length up to 2.3 mm. Eyepatch dark blue. Dorsal part of Abd. II & III and median and posterior parts of Abd. IV centrally with blue pigment. Coxa and distal part of Ant. IV weakly pigmented ( Fig. 4 A–B).

HEAD. Antenna 0.45−0.56 times as long as body. Ratios of length of antennal segments I:II:III:IV = 1:1.6−2.0:1.3−1.7:2.3−3.1. Distal part of Ant. IV with many sensory setae, normal ciliate setae and apical bulb biolobed ( Fig. 5A ). Dorsal cephalic chaetotaxy with 7 antennal (An), 4 median (M 1 −M 4,) and 9 sutural (S 0 −S 6, S 4i, S 5i) mac. Interocular area with p, s, t setae. Eyes 8+8, G and H smaller ( Fig. 5B ). Labral setae as 4/5, 5, 4, all slender; prelabral setae ciliate, other smooth; distal margin of labrum with 4 papillae, each with 1 denticle ( Fig. 5C ). Lateral process of labial palp straight, as thick as normal setae, with tip not reaching apex of labial papilla ( Fig. 5D ). Labial triangle setae as in Fig. 5E , all finely ciliate.

THORAX. Dorsal macrochaetae shown as in Fig. 5F . Th. II with 2 (m1, m2) (rarely 3, m2i present) mediomedian, 3 (m4, m 4i, m4p) medio-lateral and 16−18 posterior mac on each side, 2 S-setae present on medio-lateral margin. Th. III with 16−17 median and 6 (a6, a6i, p5, p6, m6, m6e) lateral mac on each side. Trochanteral organ with 42−49 smooth spiny setae ( Fig. 5G ). Unguis with 4 inner teeth, one pair located 0.45−0.50 from base of inner edge of unguis, distal unpaired two respectively at 0.70−0.74 and 0.85−0.88 distance from base. Unguiculus acuminate and outer edge serrate. Tenent hair thick with clavate tip, slightly longer than inner side of unguis ( Fig. 5H ).

ABDOMEN. Abd. IV 2.8−5.0 times as long as Abd. III along dorsal midline. Dorsal mac shown in Figs 6A & 6B . Abd. I with 4 (m2, m3, m4, m4p) (rarely 3, m4p absent) mac. Abd. II with 4−5 (a2, a3, m3, m3e, m3ep, a3 sometimes absent), 1(m5) lateral mac and 2 sensory chaetae. Abd. III with 3 (a2, a3, m3) dorso-central, 5 (am6, pm6, p6, m7a, p7) lateral mac and 3 sensory chaetae ( Fig. 6A ). Abd. IV with 10−12 central (A3, A4, A6, B3, B4, B5, B6 always present) and 17−20 lateral mac as in Fig. 6B . Ventral tube anteriorly with 3 large and 15−23 small ciliate setae ( Fig. 6C ), posteriorly with 2 apical smooth setae and about 35 ciliate setae of different sizes ( Fig. 6D ); lateral flap not clearly seen. Manubrial plaque with 8−11 ciliate setae and 3(4) pseudopores on each side ( Fig. 6E ). Dens without spines, uncrenulated dens 1.4−1.7 times as long as mucro. Mucro bidentate, two teeth subequal and tip of basal spine reaching subapical tooth ( Fig. 6F ).

SCALES. All scales spinulate type and present on Ant. I, head, body, legs and ventral tube, ventral side of manubrium ( Fig. 6G ).

Remarks

The new species can easily be distinguished from the other species of the genus by their color pattern, except for the Vietnamese species Willowsia bartkei Stach, 1965 . Both new species have blue pigment on the dorsal part of Abd. II and III and on the median and posterior parts of Abd. IV centrally, but there is no blue pigment on Abd. I posteriorly and Abd. II and III laterally in the former, whereas pigment is present in the latter. The other differences, such as chaetotaxy and scales, are listed in Table 2 .

Figures

Fig. 4. Willowsia zhaotongensis sp. nov. A−B. Habitus (A = paratype; B = holotype). Scale bars: 500 μm.

Fig. 5. Willowsia zhaotongensis sp. nov. A. Apex of Ant. IV. B. Dorsal chaetotaxy of head. C. Labrum. D. Lateral process of labial palp. E. Labium. F. Chaetotaxy of Th. II−III. G. Trochanteral organ. H. Hind foot complex. Scale bars: A, C–E, G–H = 15 μm; B, F = 50 μm.

Fig. 6. Willowsia zhaotongensis sp. nov. A. Chaetotaxy of Abd. I−III. B. Chaetotaxy of Abd. IV. C. Anterior face of ventral tube. D. Posterior face of ventral tube. E. Plaque of manubrium. F. Distal part of dens and mucro. G. Scale. Scale bars: A–B = 50 μm; C–G = 15 μm.