Willowsia christianseni

Chang, Yan, 2018, Three new species of Willowsia (Collembola: Entomobryidae) from Guizhou Province, China, European Journal of Taxonomy 470, pp. 1-18: 9-10

publication ID

https://doi.org/10.5852/ejt.2018.470

publication LSID

lsid:zoobank.org:pub:23F39FCF-8162-4933-BF5D-B7FFD9A5500C

persistent identifier

http://treatment.plazi.org/id/FEBAECA8-BB5C-46FC-95C1-6A194A32330B

taxon LSID

lsid:zoobank.org:act:FEBAECA8-BB5C-46FC-95C1-6A194A32330B

treatment provided by

Plazi

scientific name

Willowsia christianseni
status

sp. nov.

Willowsia christianseni  sp. nov.

urn:lsid:zoobank.org:act:FEBAECA8-BB5C-46FC-95C1-6A194 A32330 B

Figs 5 View Figure ̅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).GoogleMaps 

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 View Figure ).

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 View Figure ). Dorsal cephalic chaetotaxy with 6 antennal (An), 4 median (M) and 8 sutural (S) mac ( Fig. 6B View Figure ). Interocular chaetae as p, s, t, all finely ciliate ( Fig. 6B View Figure ). Eyes 8+8, G and H smaller ( Fig. 6B View Figure ). 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 View Figure ). Lateral process of labial palp curved, slightly thicker than normal chaetae, with tip exceeding apex of labial papilla ( Fig. 6D View Figure ). Labial triangular chaetae as in Fig. 6E View Figure , MREL 1L2 all finely ciliate.

THORAX. Dorsal macrochaetae shown as in Fig. 6F View Figure . 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 View Figure ). 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 View Figure ).

ABDOMEN. Abd. IV 4.0 times as long as Abd. III along dorsal midline. Dorsal mac shown in Figs 7A–7B View Figure . 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 View Figure ). Abd. IV with 10̅12 central (A3, A4, A6, B3, B4, B5, B6 always present) and about 14 lateral mac as in Fig. 7B View Figure . Ventral tube anteriorly with about 15 ciliate chaetae ( Fig. 7C View Figure ), 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 View Figure ).

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 View Figure ).

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.