Entomobrya polychaeta, Ma & Shi, 2018

Yitong Ma & Shidi Shi, 2018, Three new species of Entomobrya (Collembola: Entomobryidae) from China, European Journal of Taxonomy 419, pp. 1-21 : 8-13

Entomobrya polychaeta sp. nov.

urn:lsid:zoobank.org:act:B53D28DE-4033-467F-9077-60C916C12AF7

Figs 6–10, Table 2

Diagnosis

Three pairs of interrupted, longitudinal dark blue stripes present from Th. II to Abd. III; 7–9 mediomedial and 6–8 medio-sublateral mac on Th. II; 4 central and 8 lateral mac on Abd. III.

Etymology

The specific epithet is derived from the Latin ‘ poly ’, meaning ‘many’, referring to the many mac on the lateral side of Abd. III.

Type material

Holotype

CHINA: ♀ on slide, 108 National Highway, Mazhao Town , Zhouzhi County, Xi’an City , Shaanxi Province, 34°03′35″ N, 108°11′47″ E, altitude ca 566 m, in litter, with aspirator, 15 Jul. 2012, Yitong Ma leg. (Nantong University, collection number 1115).

Paratypes

CHINA: 2 ♀♀ on slides, same collecting data as for holotype.

Description

MEASUREMENTS. Body length up to 2.24 mm.

COLOUR. Ground colour pale yellow. Middle and distal parts of Ant. I–III blue pigmented and pigment also present on Ant. IV. An irregular dark blue circle present along margin of head. Besides a transverse dark stripe present between eyepatches, some dark patches present on middle and posterior part of head. A pair of longitudinal stripes present laterally from anterior part of Th. II to Abd. IV. There are also two pairs of discontinuous longitudinal stripes from posterior part of Th. II to Abd. III: one is located centrally and other medio-laterally. Posterior margin of Abd. III with a narrow transverse blue stripe. Abd. IV with longitudinal median stripes and irregular patches. Coxae, distal part of femora and middle part of tibiotarsi with blue pigment ( Fig. 6A–C).

HEAD. Antenna 0.58–0.68 times as long as body. Antennal segments ratio as I: II: III: IV = 1.00:1.56– 1.85: 1.32–1.74: 1.85–2.12. Distal part of Ant. IV with many sensory chaetae, normal ciliate chaetae and apical bulb unilobed ( Fig. 7A). Lateral process (l.p.) of labial palp curved with tip reaching apex of same papilla ( Fig. 7B). Subapical chaeta of maxillary outer lobe subequal to apical one, 3 smooth hairs on sublobal plate ( Fig. 7C). Labial chaetae MREL 1L2, all ciliate; chaeta R 0.67–0.70 as long as chaeta M ( Fig. 7D). Labral chaetae 4/5, 5, 4, prelabral chaetae ciliate and other smooth; labral papillae 4 and each with 1 minute denticle ( Fig. 7E). Clypeus not clearly seen. Dorsal cephalic chaetotaxy with 4 antennal (An), 4 median (M), 8 sutural (S) mac and 6–7 mac in Gr. II; interocular chaetae as p, s, t ( Fig. 7F).

THORAX. Th. II with 7–9 medio-medial, 6–8 medio-sublateral, 33–35 posterior mac, 1 ms and 2 sens. Th. III with 42–43 mac and 2 sens ( Fig. 8A). Coxal macrochaetal formula as 3 (2 pseudopores)/ 4+2, 3 (4 pseudopores) /4+2 (2 pseudopores) ( Fig. 8 B –D). Trochanteral organ with 28–33 chaetae ( Fig. 8 E). Tenent hair subequal to inner side of unguis, with tip strongly clavate. Unguis with 4 inner teeth, basal pair located 0.47̅0.49 distance from base of inner edge of unguis, distal unpaired two respectively at 0.71̅0.73 and 0.88̅0.89 distance from base. Unguiculus acuminate with outer edge serrate ( Fig. 8 F).

ABDOMEN. Abd. IV 5.02–6.11 times as Abd. III in length along dorsal midline. Abd. I with 12(11) (m 2i, m2, m3, m4, m 4i, m4p, a1, a1a, a2, a3, a5, m 4i sometimes absent) mac, 1 ms and 1 sens; sens inner to ms. Abd. II with 7(8) (a2, a3, m3e, m3ea, m 3ei, m3ep, m3, an unknown mac sometimes present between m3e and m3ep) central, 1 (m5) lateral mac and two sens. Abd. III with 4 (a2, a3, a3a, m3) central, 8(6 or 7) (am6, pm6, m7a, m7, p6, p7, 2 unknown) lateral mac, 1 ms and 2 sens ( Fig. 9 A). Abd. IV with 48̅58 central and 26̅29 lateral mac ( Fig. 9 B). Abd. V with 3 sens ( Fig. 9 C). Ventral tube with 39 ciliate chaetae on anterior face (in 1 individual) ( Fig. 10 A), posterior face not clearly seen, 5 smooth and 11̅17 ciliate chaetae on each lateral flap ( Fig. 10 B). Manubrial plaque with 7 ciliate chaetae and 3 pseudopores on each side in 2 individuals ( Fig. 10 C). Distal smooth part of dens about 1.48–1.56 times as long as mucro. Mucro bidentate and subapical tooth equal to apical tooth. Basal spine almost reaching apex of subapical tooth ( Fig. 10D).

Remarks

The new species is characterised by its three pairs of longitudinal dark blue stripes present from Th. II to Abd. III, 7–9 medio-medial and 6–8 medio-lateral mac on Th. II, usually 8 lateral mac on Abd. III. It is most similar to the Korean species E. koreana Yosii, 1965 and the Chinese E. retingensis Baquero & Jordana, 2008 in colour pattern, but the differences between them are great, such as chaetotaxy on Th. II and Abd. III and the ratio of the smooth part of the dens to the mucro ( Table 2).

Tables

Table2. Comparison amongEntomobryapolychaetasp.nov., E.koreanaYosii,1965and E.retingensis Baquero & Jordana, 2008.

Characters	E. polychaeta sp. nov.	E. koreana	E. retingensis
Blue longitudinal stripes from Th. II to Abd. III	6 stripes	5 stripes	no longitudinal stripes
Medio-medial mac on Th. II	7–9	2	0
Medio-lateral mac on Th. II	6–8	4	2
Central mac on Abd. III	4	3	3
Lateral mac on Abd. III	8	4	3
Length ratio of smooth part of dens to mucro	1.5–1.6	2.3	2.4
Locality	China (Shaanxi)	Korea	China (Tibet)