Entomobrya shaanxiensis, Jing & Ma, 2023

Jing, Mei-Dong & Ma, Yi-Tong, 2023, Three new species of Entomobryidae (Collembola, Entomobryoidea) from China, ZooKeys 1167, pp. 293-315 : 293

Entomobrya shaanxiensis sp. nov.

Figs 54-55 , 56-60 , 61-63 , 64 , 65, 66 , 67-70

Type material.

Holotype. ♀ on slide, China, Shaanxi Province, Xian City, Zhouzhi County, Cuifeng Town, Qingshan Park, 34°04'49″N, 108°01'58″E, 901 m asl, sample number 1109, collected by Y-T Ma, 17-VII-2012, from leaf litter, deposited in NTU. Paratypes. 4♀♀ on slides, same data as holotype.

Description.

Size. Body length up to 1.65 mm.

Colouration. Ground colour pale yellow in ethanol. Ant. IV and distal part of Ant. I-III blue pigment. Eyepatches dark blue. An irregular blue stripe present from eyepatch to Th. III laterally and from Th. II to Abd. III sublaterally, respectively. Posterior part of Abd. III with a transverse irregular blue stripe. Abd. IV with two irregular transverse stripes, one located medially and other posteriorly. Abd. V with a pair of blue spots. Legs with scattered pigment (Figs 54 , 55 ).

Head. Antenna 0.47-0.55 times body length; antennal segment ratio I: II: III: IV = 1: 1.70-2.00: 1.50-1.88: 2.43-2.75. Apical bulb of Ant. IV bilobed (Fig. 56 ). Eyes 8 + 8, G and H smaller than others, interocular chaetae with p, r, and t mes. Dorsal cephalic chaetotaxy with five antennal (An1, An2a, An2, An3a1, An3), four median (M1, M2, M3, M4) and eight sutural (S0, S1, S2, S3, S4, S4i, S5i, S5) mac (Fig. 57 ). Labral chaetae 4/5, 5, 4, all slender; prelabral chaetae ciliate, other smooth, four labral papillae with one minute denticle each (Fig. 58 ). Lateral process (l.p.) of labial papilla E differentiated, as thick as normal chaeta, with tip exceeding apex of papilla E (Fig. 59 ). Chaetal formula of labial base as MREL1L2, M rarely duplicate, all ciliate; R 0.56-0.71 times length of M (Fig. 60 ).

Thorax. Th. II usually with four medio-medial (m1, m2, m2i, m2i2 rarely absent), four medio-sublateral (m4, m4i, m4p, m4pi, m4i2 rarely present), 23-27 (p6 sometimes absent) posterior mac, one ms and two sens (ms antero-external to sens). Th. III with 29-33 mac and two sens (Fig. 61 ). Trochanteral organ with 21-27 smooth spiny chaetae (Fig. 62 ). Tenent hair capitate and longer than inner edge of unguis in length. Unguis with four inner teeth. Unguiculus acuminate and outer edge slightly serrate (Fig. 63 ).

Abdomen. Range of Abd. IV length as 4.03-5.50 times dorsal axial length of Abd. III. Abd. I with 10-11 (a1, a1a, a2-3, m2-4, m2i, m4i, m4p, a5, a1a sometimes absent) mac, ms antero-external to sens. Abd. II with six (a2, a3, m3, m3e, m3ea, m3ep) central, one (m5) lateral mac and two sens. Abd. III with two (a2, a3) central, and four (am6, pm6, m7a, p6) lateral mac, one ms and two sens (Fig. 64 ). Abd. IV with two normal length sens; centrally with eight mac, laterally 13-16 mac (Fig. 65 ). Abd. V with three sens, middle one posterior to m3 (Fig. 66 ). Anterior face of ventral tube with some ciliate chaetae, 3+3 of them as mac, line connecting proximal (Pr) and external-distal (Ed) mac oblique to median furrow (Fig. 67 ); posterior face and lateral flap not clearly seen. Manubrial plaque dorsally with about five ciliate chaetae and three pseudopores (Fig. 68 ); ventrally with 11-13 ciliate chaetae (Fig. 69 ). Distal smooth part of dens about 2.33 times as long as mucro. Mucro bidentate with subapical tooth subequal to apical one; tip of basal spine reaching apex of subapical tooth (Fig. 70 ).

Etymology.

Named after its locality: Shaanxi Province.

Ecology.

In the leaf litter.

Remarks.

The new species is characterised by its colour pattern, one minute denticle on each labral papilla, and the tip of the lateral process (l.p.) of the labial papilla E exceeding the apex of the papilla E. It is very similar to E. aino (Matsumara & Ishida, 1931) in colour pattern, macrochaetotaxy of Abd. III-IV and other characters, but there are some differences between them, such as chaetotaxy on Abd. I, II and IV (Table 3 ).

Figures

Figure 64. Entomobrya shaanxiensis sp. nov. Chaetotaxy of Abd. I-III. Scale bar: 50 μm.

Figures 54, 55. Habitus of Entomobrya shaanxiensis sp. nov. Scale bars: 500 μm.

Figures 56 - 60. Entomobrya shaanxiensis sp. nov. 56 apex of Ant. IV 57 dorsal chaetotaxy of head 58 labrum 59 labial palp E 60 labial base. Scale bars: 20 μm.

Figures 61 - 63. Entomobrya shaanxiensis sp. nov. 61 chaetotaxy of Th. II-III 62 trochanteral organ 63 hind foot complex. Scale bar: 50 μm (61); Scale bars: 20 μm (62, 63).

Figures 65, 66. Entomobrya shaanxiensis sp. nov. 65 chaetotaxy of Abd. IV 66 chaetotaxy of Abd. V. Scale bars: 50 μm (65); 20 μm (66).

Figures 67 - 70. Entomobrya shaanxiensis sp. nov. 67 anterior face of ventral tube 68 manubrial plaque 69 ventro-apical part of manubrium 70 mucro. Scale bars: 20 μm.