Willowsia sexachaeta, Chang, 2018

Chang, Yan, 2018, Three new species of Willowsia (Collembola: Entomobryidae) from Guizhou Province, China, European Journal of Taxonomy 470, pp. 1-18 : 4-8

publication ID	https://doi.org/ 10.5852/ejt.2018.470
DOI	https://doi.org/10.5281/zenodo.5667116
persistent identifier	https://treatment.plazi.org/id/885D511B-FF92-115C-FDED-FADFFC0CFA0A
treatment provided by	PlaziZenodoSync
scientific name	Willowsia sexachaeta
status	sp. nov.

Treatment

Willowsia sexachaeta View in CoL sp. nov.

urn:lsid:zoobank.org:act:972AD9E1-C147-43A0-ADA4-184AEB45550B

Figs 1 View Fig. 1 ̅4, Tables 1–2 View Table 1

Diagnosis

A longitudinal stripe present from eyepatch to Th. III along lateral side; Abd. I with 3 mac; Abd. II with 3 central mac; Abd. III with 2 central and 3 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

Named after the characteristic six (Latin word “ sex- ”) macrochaetae present on the central part of Abd. IV.

Type material

Holotype CHINA: ♀, on slide, 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 and litter, 21 Apr. 2014, Shangze Wu leg. (collection number 1132, NTU). GoogleMaps

Paratypes

CHINA: 9 ♀♀, on slides, same data as holotype.

Description

MEASURMENTS. Body length up to 1.6 mm.

COLOUR. Ground colour pale yellow. Antennae with scattered blue pigment, especially distal part of each segment. Eyepatches dark blue. Longitudinal stripe present from eyepatch to Th. III along lateral side ( Figs 1A–1B View Fig. 1 ).

HEAD. Antenna 0.4̅0.6 × as long as body. Antennal segments ratio as I: II: III: IV = 1.0: 1.7̅2.2: 1.7̅2.3: 2.8̅3.5. Distal part of Ant. IV with many sensory chaetae, normal ciliate chaetae and a bilobed apical bulb ( Fig. 2A View Fig. 2 ). Dorsal cephalic chaetotaxy with 5̅7 antennal (An), 4 median (M) and 8 sutural (S) mac. Interocular chaetae as p, s, t, all finely ciliate ( Fig. 2B View Fig. 2 ). Eyes 8+8, G and H smaller ( Fig. 2B View Fig. 2 ). Labral chaetae as 4/5, 5, 4, all slender; prelabral chaetae ciliate, other smooth; labral papillae not clearly

seen ( Fig. 2C View Fig. 2 ). Lateral process of labial palp curved, slightly thicker than normal chaetae, with tip

not reaching apex of labial papilla ( Fig. 2D View Fig. 2 ). Labial triangular chaetae as MREL1L2, all finely ciliate ( Fig. 2E View Fig. 2 ).

THORAX. Th. II with 2 (m4, m 4i) medio-sublateral, 9̅11 posterior mac (p4 sometimes absent, p6 rarely present), 1 ms and 2 sens ( Fig. 2F View Fig. 2 ). Th. III with 8̅9 (p 1i sometimes present) median, 6 (m5, a6, p5, p6, m6, m6e) lateral mac and 2 sens, p5 rarely absent ( Fig. 2F View Fig. 2 ). Trochanteral organ with 27̅38 smooth spiny chaetae ( Fig. 2G View Fig. 2 ). Unguis with 4 inner teeth, one pair located about 0.5 from base of inner edge of unguis, distal unpaired two at about 0.7 and 0.9 distance from base respectively. Unguiculus acuminate and outer edge serrate. Tenent hair thick with clavate tip, almost equal to or slightly longer than inner edge of unguis ( Fig. 2H View Fig. 2 ).

ABDOMEN. Abd. IV 3.0̅4.5 times as long as Abd. III along dorsal midline. Dorsal mac shown in Fig. 3A–B View Fig. 3 . Abd. I with 3 (m2, m3, m4) mac, 1 ms and 1 sens; sens inner to ms. Abd. II with 3 (a2, m3, m3e) central, 1 (m5) lateral mac and 2 sens. Abd. III with 2 (a2, m3) central, 3 (am6, pm6, p6) lateral mac, 1 ms and 2 sens ( Fig. 3A View Fig. 3 ). Abd. IV with 6 (A3, A6, B3, B4, B5, B6) central and 11̅13 lateral mac ( Fig. 3B View Fig. 3 ). Ventral tube anteriorly with 11̅16 ciliate chaetae ( Fig. 3C View Fig. 3 ), posteriorly with 2 apical smooth chaetae and 7̅11 ciliate chaetae ( Fig. 3D View Fig. 3 ), laterally with 5 smooth and 2̅3 ciliate chaetae ( Fig. 3E View Fig. 3 ). Manubrial plaque with 6̅7 ciliate chaetae and 2 (rarely 3) pseudopores ( Fig. 3F View Fig. 3 ). Dens without spines, uncrenulated dens 1.4̅1.7 times as mucro in length. Mucro bidentate, two teeth subequal and tip of basal spine reaching subapical tooth ( Figs 3G View Fig. 3 , 4A View Fig. 4 ).

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 ( Figs 4B–4C View Fig. 4 ).

Remarks

The new species is similar to another Chinese species, W. baoshanensis Chai & Ma, 2017 , in colour pattern and scale morphology, but the difference between them in chaetotaxy is great. It is also similar to the species W. japonica ( Folsom, 1897) in colour pattern on the body and three mac on Abd. I, but scale morphology is of the spinulate type in the former and the short rib type in the latter ( Table 1 View Table 1 ). The differences between the three species are great, as shown in Table 2.