Willowsia arunachalensis, Mandal & Mandal & Suman & Bhattacharya, 2024

Mandal, Pritha, Mandal, Guru Pada, Suman, Kusumendra Kumar & Bhattacharya, Kaushik Kumar, 2024, Two new species and one new record of Willowsia Shoebotham, 1917 (Collembola: Entomobryidae) from the Eastern Himalayan region of India, European Journal of Taxonomy 935, pp. 101-121 : 110-112

publication ID	https://doi.org/ 10.5852/ejt.2024.935.2549
publication LSID	lsid:zoobank.org:pub:C4364351-09E6-4934-AF52-9EC6704E353F
DOI	https://doi.org/10.5281/zenodo.11277738
persistent identifier	https://treatment.plazi.org/id/8AEC0266-A90C-40E2-B23C-B82C9A363BD4
taxon LSID	lsid:zoobank.org:act:8AEC0266-A90C-40E2-B23C-B82C9A363BD4
treatment provided by	Plazi
scientific name	Willowsia arunachalensis
status	sp. nov.

Treatment

Willowsia arunachalensis sp. nov.

urn:lsid:zoobank.org:act:8AEC0266-A90C-40E2-B23C-B82C9A363BD4

Figs 4–6 View Fig View Fig View Fig , Tables 1–2 View Table 1 View Table 2 , 4 View Table 4

Diagnosis

Body segments with distinct pigment patches, intensely coloured laterally; Abd. III pigmented; Scales of long basal rib type, absent on legs and antennae, present on manubrium; labral papilla with 2–4 denticles; Abd. I–IV with 2, 4, 2, 8 central mac on each side respectively, Abd. IV with 13 lateral mac.

Etymology

The specific epithet was given after the type collection state Arunachal Pradesh ( India).

Type material

Holotype INDIA • ♀ (on slide); Arunachal Pradesh, West Kameng district, Bomdila town, Bomdila Forest Inspection Bungalow ; 27°15.957′ N, 92°25.520′ E; 8337 ft a.s.l.; 29 Mar. 2023; G.P. Mandal leg., reg. no. 3386/H14; NZC. GoogleMaps

Paratypes INDIA • 4 ♀♀ (on slides), 18 specs in alcohol; same collection data as for holotype; reg. no. 3387/H14; NZC GoogleMaps .

Description

MEASUREMENTS. Average body length in adult up to 3 mm ( Fig. 4A–B View Fig ).

COLOUR. Ground colour pale yellow, blue pigment scattered as distinct patches all over body, especially on lateral side. Eye patches dark blue; blue transverse band between eyes; ventral side of head blue pigmented. Antennae pigmented, darker towards tip. Legs with blue pigment, furcula unpigmented ( Fig. 4A–B View Fig ).

SCALES. Scales of long basal rib type ( Figs 4D View Fig , 5A View Fig ); present on body and ventral manubrium. Antennae and legs devoid of scales.

HEAD. Eyes 8+8, G and H smaller. Antenna 2.57 × as long as cephalic diagonal. Antennal segment ratio as I: II: III: IV = 1: 2.42: 2.26: 3.1. Ant. IV with bilobed apical bulb, many sensory setae and normal ciliated setae ( Fig. 5B View Fig ). Dorsal cephalic chaetotaxy as Fig. 5C View Fig , with four antennal (An), four median (M 1 –M 4) and seven sutural (S 0, S 2 –S 5, S 4i, S 5i) mac. Labral formula 4/5, 5, 5, prelabral setae ciliated and other smooth, four labral papillae each with 2–4 denticles ( Figs 4C View Fig , 5D View Fig ). Labial palp with a thick lateral process, tip not reaching at apex of labial papilla ( Fig. 5E View Fig ). Labial triangular setae as MREL 1 L 2, all ciliated ( Fig. 5F View Fig ).

THORAX. Thoracic mac as Fig. 5G View Fig ; Th. II with two medio-sublateral (in figure T2), nine posterior mac, Th. III with 13 mac on each side. Trochanteral organ with 15–17 smooth spiny setae, 11–12 in ‘L’ arrangement and five present in inner area ( Fig. 5H View Fig ). Unguis with 4 inner teeth,1 paired basal and 2 unpaired, one external basolateral tooth present. Hind leg paired and two unpaired teeth distance from unguis base 21 µm, 32 µm, 40 µm respectively, between two unpaired teeth 8 µm. Unguiculus lanceolate with outer edge serrate, tenent hair thick and serrated with clavate tip ( Figs 4E View Fig , 6A View Fig ).

ABDOMEN. Abd. IV 2.6 × as long as Abd. III along dorsal midline. Dorsal chaetotaxy of Abd. I–IV as shown in Fig. 6B–C View Fig . Abd. I with two central mac (m3, m4) and two sens. Abd. II with four central mac (a2, m3, m3e, m5) and 6–7 lateral mesochaete, two sens. Abd. III with two central (a2, m3), four lateral mac (am6, pm6, p6, m7a) and two two sens ( Fig 6B View Fig ). Abd. IV with 8 central mac (A4, A6, A6e, A7e, B4–B6, Si, Sm), 13 lateral mac and 7 S-setae ( Fig. 6C View Fig ). Ventral tube with 4+4 anterior long and other 10+10 ciliated setae, 8+8–10+10 smooth lateral flap setae, posterior side with 1+1 smooth setae ( Fig. 6D View Fig ). Tenaculum quadridentate with a stout single seta. Manubrial plaque with five ciliated seate, two pseudopores visible ( Fig. 6E View Fig ). Basal part of dens a little thick, uncrenulated dens 2.45 × as long as mucro. Mucro bidented with single basal spine ( Fig. 6F View Fig ).

Remarks

Willowsia arunachalensis sp. nov. is similar to W. ieti Yosii, 1971 in chaetotaxy pattern, although differs from the latter in having lanceolate hind unguiculus, spine number of trochanteral organ and absence of scale on antennae, details given in Table 4 View Table 4 . The new species is closest to W. cassagnaui Zhang, 2015 for both species have no scales on Ant. I and legs. However, the latter has 3+3 mac on Abd. I and rounded labral papillae. Willowsia buski ( Lubbock, 1870) and the new species share a similar body chaetotaxy though they differ in colour pattern, Abd. IV chaetotaxy, labral papillae structure, trochanteral setae number etc. ( Table 4 View Table 4 ). A detailed comparison of all the related species of Willowsia with W. arunachalensis is given in Table 1 View Table 1 along with chaetotaxic comparison of the same ( Table 2 View Table 2 ).