Entomobryoides sotoadamesi Jordana, Potapov & Baquero, 2011

Chang, Yan, Pan, Zhixiang & Ma, Yitong, 2020, A new species of Entomobrya (Collembola: Entomobryidae) from the Northeast China and first record of Entomobryoides sotoadamesi, Zootaxa 4731 (3), pp. 335-346 : 337-341

Entomobryoides sotoadamesi Jordana, Potapov & Baquero, 2011

Figs 3–4 , 22–35 , Table 1

Material examined: 5 females and 1 male on slides, China, Jilin Province, Yanbian Autonomous Prefecture, Antu County, Erdao Baihe Town , in litter, 8 Aug. 2009, collection number 1116, by Yitong Ma with aspirator, deposited in Nantong University .

Description of Chinese specimens. Labral chaetae 4/5, 5, 4, all smooth; labral papillae not clear seen ( Fig. 22 ). Lateral process (l.p.) of labial palp straight and short with tip not reaching apex of same papilla ( Fig. 23 ). Labial chaetae M 1 M 2 M 3 REL 1 L 2 (M3 sometimes absent), all ciliate; chaeta R 0.35–0.71 as long as chaeta M 1 ( Fig. 24 ). Dorsal cephalic chaetotaxy with 5 antennal (An), 4 median (M) and 8 sutural (S) mac, 6–13 mac in Gr. II, interocular chaetae as p, q, r, s, t ( Fig. 25 ).

Thorax. Th. II with 4 (m1, m2, m2i, m2i2 rarely absent) mac and 2–3 mesochaetae medio-medial (Mm), 4–5 (m4, m4i, m4i2, m4p, m4pi sometimes absent) mac medio-sublatera (Ms), 56–78 posterior mac, 1–3 medio-medial mesochaetae usually present, m5 absent, 1 ms and 2 sens. Th. III with (54) 59–62 mac and 2 sens ( Fig. 26 ). Trochanteral organ with about 55 chaetae ( Fig. 27 ).

Abdomen. Abd. I with 18–22 (m2i, m2, m3, m4, m4i, m4p, a1, a1a, a2, a2e, a3, a5, a5i, a6 always present, a3e and m5 sometimes present) mac, rarely with 26 mac, 1 ms and 1 sens; sens inner to ms. Abd. II with 7 (8) (a2, a3, m3e, m3ea, m3ep, m3, m 3ei, m3eai sometimes absent) central, 1 (m5) lateral mac and two sens. Abd. III with 3 (a2, a2a a3) central, 3 (am6, pm6, p6) lateral mac, 1 ms and 2 sens ( Fig. 28 ). Abd. IV with 7 (A2p, A5, A6, B2, Ae5pp, Ae7, Ae8) central and 18–26 lateral mac ( Fig. 29 ). Abd. V with 3 sens ( Fig. 30 ). Ventral tube with 16–27 ciliate chaetae on anterior face, 3+3 of them distally as mac ( Fig. 31 ), 2 apical smooth and many ciliate chaetae on posterior face ( Fig. 32 ), 6–13 smooth and 14–18 ciliate chaetae on each lateral flap ( Fig. 33 ). Manubrial plaque with 18 (13 or 26) ciliate chaetae and 2–5 pseudopores on each side ( Fig. 34 ) and ventro-apical part of manubrium with 57–76 ciliate chaetae ( Fig. 35 ).

Remarks. This species was first described in 2011 from Russia, Shkotovsky, western part of Anisimovka which is about 200 km from Jilin Province, China and it has not been recorded again since that time. Chinese specimens agree mostly with the original description in colour pattern, claw, chaetotaxy on abdomen, mucro and other characters. The difference between them is that tip of lateral process of labial palp is not reaching apex of same papilla in Chinese specimens, while exceeding in Russian specimens. In addition, S3 on dorsal head is present in the former, while absent in the latter. These differences are small and may be a geographic variation. This species is great different from Entomobryoides mauna in colour pattern, labial chaetae and chaetotaxy on Abd. IV ( Table 1 ). Our description complement the original one provided by Jordana et al. (2011) and presents several characters previously not reported to E. sotoadamesi .

Discussion. About 270 species of Entomobrya Rondani, 1861 have been described all over the world and only 18 of them were reported from China, which has a vast area of 9,600,000 km 2 and contains various environments. Possibly due poor investigation, most provinces do not present records of the genus ( Fig. 36 ).

N: not reaching apex of the same papilla; R: reaching apex of the same papilla; L: larger than apical tooth; E: equal to apical tooth; S: smaller than apical tooth; *: Stach 1963; ▲: Stach 1963; ▄: Jordana 2012.

Entomobryoides Maynard, 1951 is better represented in Hawaii than anywhere else ( Christiansen & Bellinger 1992) and among the 10 known species of the genus, six of them were reported from the archipelago. In China, the only record of Entomobryoides , E. mauna Christiansen & Bellinger, 1992 , was reported by Wang in 2003. We suspect that his specimens do not belong to E. mauna since his description was so simple that there was no other information except its locality. Secondly, E. mauna was described from Hawaii and there was no other reliable record from any other place. Thirdly, there is no other report of the genus from Japan, Koren and Southeast Asia in which Collembola fauna was well studied. So we believe Wang’s record maybe bolongs to E. sotoadamesi or other species.

Figures

FIGURE 36. Distribution of known Chinese species of Entomobrya and Entomobryoides. 1, Entomobrya aino (Matsumura & Uchida, 1931); 2, E. cheni Baquero, Arbea & Jordana, 2010; 3, E. chungseensis Baquero & Jordana 2008; 4, E. corticalis (Nicolet, 1842); 5, E. dingi Ma & Shi, 2018; 6, E. dorsosignata Stach, 1963; 7, E. fjellbergi Baquero & Jordana 2008; 8, E. griseoolivata (Packard, 1873); 9, E. hortensis Stach, 1963; 10, E. huangi Chen & Ma, 1998; 11, E. imitabilis Stach, 1963; 12, E. karlstetterae Baquero & Jordana 2008; 13, E. leviseta Ma & Shi, 2018; 14, E. marginata (Tullberg, 1871); 15, E. mieheorum Baquero & Jordana 2008; 16, E. pekinensis Stach, 1963; 17, E. polychaeta Ma & Shi, 2018; 18, E. retingensis Baquero & Jordana 2008; 19, Entomobryoides sotoadamesi; 20, Entomobrya tristriata sp. nov.

FIGURES 1–4. 1–2, Entomobrya tristriata sp. nov., habitus; 3–4, Entomobryoides sotoadamesi, habitus.

FIGURES 22–27. Entomobryoides sotoadamesi 22, prelabral and labral chaetae; 23, lateral process of labial papilla E; 24, labium; 25, dorsal cephalic chaetotaxy; 26, dorsal chaetotaxy of Th. II–III; 27, trochanteral organ. Scale bars: 22–24, 27 = 20 µm; 25–26 = 50 µm.

FIGURES 28–30. Entomobryoides sotoadamesi 28, dorsal chaetotaxy of Abd. I–III; 29, dorsal chaetotaxy of Abd. IV; 30, dorsal chaetotaxy of Abd. V. Scale bars: 28–30 = 50 µm.

FIGURES 31–35. Entomobryoides sotoadamesi 31, anterior face of ventral tube; 32, apical part of posterior face of ventral tube; 33, lateral flap of ventral tube; 34, manubrial plaque; 35, ventro-apical part of manubrium. Scale bars: 31–35 = 20 µm.

Tables

TABLE 1. Comparison among Entomobryoides sotoadamesi, E. mauna, Entomobrya tristriata sp. nov., E. sibirica and E. unostrigata.

Characters	Entomobryoides	Entomobryoides	Entomobrya	Entomobrya	Entomobrya
	sotoadamesi	mauna	tristriata sp. nov.	sibirica	unostrigata
Labial chaetae	M 1 M 2 M 3 REL 1 L 2	m 1 m 2 rel 1 l 2	M 1 M 2 REL 1 L 2	Not known	Not known
Apical bulb on Ant. IV	absent	absent	present	present ▲	present*
Tip of lateral process of	N	R	N	R ▲	R*
labial palp Subapical tooth on mucro	L	E	L	L ▲	S*
Mac. on Mm of Th. II	4	5	4–5	2 ▄	2 ▄
Mac. on Ms of Th. II	4–5	5	3	3 ▄	4 ▄
Central mac on Abd. II	7 (8)	6	6	5 ▄	6 ▄
Central mac on Abd. III	3	4	3	2 ▄	2 ▄
Central mac on Abd. IV	7	11	15–17	10 ▄	16 ▄
Locality	Russia, China	Hawaii	China (Jilin)	Russia	Spain, America
(Jilin)