Willowsia christianseni Chang 2018, sp. nov.
Creators: name: Chang, Yan
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Collembola
Entomobryomorpha
Entomobryidae
Willowsia
Willowsia christianseni

description: Willowsia christianseni sp. nov.
urn:lsid:zoobank.org:act:FEBAECA8-BB5C-46FC-95C1-6A194 A32330 B
Figs 5 ̅7, Tables 1, 3
Diagnosis
Anterior margin of Th. II and lateral margin of Th. II̅III with blue pigment, an interrupted blue stripe present along posterior margins of Abd. I and II respectively; Abd. I with 4 mac; Abd. II with 4 central mac; Abd. III with 3 central and 4 lateral mac; Scales spinulate type and present on Ant. I̅II, dorsal side of head and terga, coxa to tibiotarsus, anterior face of ventral tube and ventral side of manubrium.
Etymology
In memory of Kenneth Christiansen, who gave me much help in the taxomony of Collembola.
Material examined
Holotype CHINA: ♀, on slide, collected from outside of Shangdiwan Cave, Louna Village, Dingxiao Town, Xingyi City, Guizhou Province, 25°09′33″ N, 105°02′35″ E, 1300 m a.s.l., in rotten stem of maize, 28 Apr. 2014, Shangze Wu leg (Collection number 1144, NTU).
Paratype CHINA: 1 ♀, on slide, same data as holotype.
Description
MEASUREMENTS. Body length up to 1.8 mm.
COLOUR. Ground colour pale yellow. Eyepatches dark blue. Ant. I̅IV almost blue pigmented except proximal part of each segment. Anterior margin of Th. II and lateral margin of Th. II̅III with blue pigment. An interrupted blue stripe present along posterior margins of Abd. I and II respectively. Blue pigment also present on posterior part of Abd. III̅V, distal part of femora of middle and hind legs (Figs 5A–5B).
HEAD. Antenna 0.5̅0.6 times as long as body. Antennal segments ratio as I: II: III: IV = 1: 1.7̅2.2: 1.7̅2.0: 3.0̅3.3. Distal part of Ant. IV with many sensory chaetae, normal ciliate chaetae and a bilobed apical bulb (Fig. 6A). Dorsal cephalic chaetotaxy with 6 antennal (An), 4 median (M) and 8 sutural (S) mac (Fig. 6B). Interocular chaetae as p, s, t, all finely ciliate (Fig. 6B). Eyes 8+8, G and H smaller (Fig. 6B). Labral chaetae as 4/5, 5, 4, all slender; prelabral chaetae ciliate, other smooth; distal margin of labrum with 4 papillae, each with a denticle (Fig. 6C). Lateral process of labial palp curved, slightly thicker than normal chaetae, with tip exceeding apex of labial papilla (Fig. 6D). Labial triangular chaetae as in Fig. 6E, MREL1L2 all finely ciliate.
THORAX. Dorsal macrochaetae shown as in Fig. 6F. Th. II with 1 (m1) medio-median, 2 (m4, m 4i) medio-sublateral and 18 posterior mac, m5, ms and sens not clearly seen. Th. III with 13 median, 6 (m5, a6, p5, p6, m6, m6e) lateral mac and 2 sens on each side. Trochanteral organ with 21 smooth spiny chaetae (Fig. 6G). Unguis with 4 inner teeth, one pair located 0.5 from base of inner edge of unguis, distal unpaired two at 0.8 and 0.9 distance from base respectively. Unguiculus acuminate and outer edge serrate. Tenent hair thick with clavate tip, slightly longer than length of inner edge of unguis (Fig. 6H).
ABDOMEN. Abd. IV 4.0 times as long as Abd. III along dorsal midline. Dorsal mac shown in Figs 7A–7B. Abd. I with 4 (m2, m3, m4, a5) mac, 1 ms and 1 sens; sens inner to ms. Abd. II with 4 (a2, m3, m3e, m3ep) central, 1 (m5) lateral mac and 2 sens. Abd. III with 3 (a2, a3, m3) central, 4 (am6, pm6, p6, m7) lateral mac, 1 ms and 2 sens (Fig. 7A). Abd. IV with 10̅12 central (A3, A4, A6, B3, B4, B5, B6 always present) and about 14 lateral mac as in Fig. 7B. Ventral tube anteriorly with about 15 ciliate chaetae (Fig. 7C), posteriorly and laterally not clearly seen. Dens without spines, uncrenulated dens about 2.5 × as long as mucro in. Mucro bidentate, two teeth subequal and tip of basal spine reaching subapical tooth (Fig. 7D).
SCALES. Hyaline, spinulate type, leaf-like and present on Ant. I̅II, dorsal side of head and terga, coxa to tibiotarsus, anterior face of ventral tube and ventral side of manubrium (Fig. 7E).
Remarks
The new species is similar to the species W. nigromaculata (Lubbock, 1873) in colour pattern, but scale morphology is of the spinulate type in the former and the long basal rib type in the latter. It is also similar to another species from Guizhou Province, W. pseudoshi Ma, 2016, in chaetotaxy of Th. III and Abd. I̅II, but the colour pattern and chaetotaxy of Abd. III̅IV are not the same. The differences between the three species are great, as shown in Table 3.
description: Published as part of Chang, Yan, 2018, Three new species of Willowsia (Collembola: Entomobryidae) from Guizhou Province, China, pp. 1-18 in European Journal of Taxonomy 470 on pages 9-10, DOI: 10.5852/ejt.2018.470, http://zenodo.org/record/1492621