Homidia hangzhouensis, Pan & Ma, 2021

Pan, Zhi-Xiang & Ma, Yi-Tong, 2021, Two new species of Homidia (Collembola: Entomobryidae) from Eastern China, Zootaxa 4995 (1), pp. 179-194 : 180-182

Homidia hangzhouensis sp. nov.

Figs 2 −30, Table 1

Types. Holotype: adult female on slide, China, Zhejiang Province, Hangzhou City, Xiaoshan District, Xianghu Yuewangling , 30°09′20″N, 120°13′35″E, altitude 47 m, 17 July 2018, collection number: 1186, by Yitong MA with entomological aspirator . Paratypes: Five adult females on slides, same data as holotype. All deposited in NTU.

Description. Body length up to 2.11 mm, holotype 2.11 mm. Colour pattern as in Fig. 2 : back ground colour pale yellow; Ant. III and distal part of IV blue; eye patches dark blue; central part of Th. III, coxae, and hind femora with scattered blue pigment; Abd. IV and V with two and one irregular transverse bands, respectively.

Antenna 2.11−2.60 times length of cephalic diagonal, 0.42−0.47 times body length; antennal segment ratio I: II: III: IV = 1: 1.50−1.56: 1.33−1.44: 2.56−3.33. Apical bulb of Ant. IV bilobed (Fig. 3). Sensory organ of Ant. III as 2 long and 1 short rods (Fig. 4). Sensory organ of Ant. II as 2 rods (Fig. 5). Ant. I with 3 dorsal and 4 ventral basal smooth spiny chaetae (Fig. 6). Eyes 8 + 8 (Fig. 8), G and H smaller than others, interocular chaetae with mes p, r, and t. Dorsal cephalic chaetotaxy (Fig. 7) with 4 antennal (An), 5 median (an additional mac between M2 and M3, the homology unclear) and 8 sutural (S) mac. Prelabral and labral chaetae as 4/5, 5, 4, all smooth, labral papillae absent (Figs 9−10). Basal chaeta of maxillary outer lobe thin, subequal to apical one; sublobal plate with 3 smooth chaeta-like processes (Fig. 11). Lateral process (l.p.) of labial papilla E differentiated, as thick as normal chaeta, with tip almost reaching apex of papilla E (Fig. 12). Chaetal formula of labial base as MRel1L2, chaetae e and smooth, others ciliate, R/M as 0.44−0.51 (Fig. 13).

Th. II (Fig. 14) with 4 medio-medial (m1, m2, m2i, m2i2), 3 medio-sublateral (m4, m4i, m4p), 30−33 posterior mac, 1 ms and 2 se (ms antero-external to se). Th. III with 36 mac and 2 se. Pseudopores on coxa I−III (Figs 15−17) as 2, 4, 1, respectively; coxal macrochaetal formula as 3/4+1, 3/4+2. Trochanteral organ (Fig. 18) with 39−46 smooth spiny chaetae. Tenent hair capitate and shorter than inner edge of unguis. Unguis (Fig. 19) with 4 inner teeth, basal pair located 0.42−0.48 distance from base of inner edge of unguis, distal unpaired teeth inserted at 0.64−0.70 and 0.84−0.91 distance from base, respectively. Unguiculus (Figs 19−20) lanceolate, outer edge slightly serrate.

Range of Abd. IV length as 7.60−10.51 times dorsal axial length of Abd. III. Chaetotaxy Abd. I-III as in Fig. 21. Abd. I with 8−10 (a1, a2, a3, a5, m2−4, m2i, m4i, m4p; a1 and a5 sometimes absent), ms antero-internal to se. Abd. II with 6 (a2, a3, m3, m3e, m3ea, m3ep) central, 1 (m5) lateral mac and 2 se. Abd. III with 1−2 (a2, m3, a2 sometimes absent) central and 4 (am6, pm6, m7a, p6) lateral mac, 1ms and 2 se. Abd. IV ( Fig. 22 ) with about 68 elongate and 2 normal se; anteriorly with 7−10 mac arranged in irregular transverse row, posteriorly with 7−9 (A4−6, B4−6, Ae7, Ae6 and an unknown mac sometimes present) central mac, laterally with 14−20 mac. Abd. V ( Fig. 23 ) with 3 se and middle se postero-external to m3. Anterior face of ventral tube with 22−23 ciliate chaetae, 3+3 of them as mac, line connecting proximal (Pr) and external-distal (Ed) mac oblique to median furrow ( Fig. 24 ); posterior face with 5 distal smooth and numerous ciliate chaetae; lateral flap with 6 smooth and 8−9 ciliate chaetae ( Fig. 25 ). Manubrial plaque dorsally with 9−14 ciliate chaetae and 2−3 pseudopores ( Fig. 26 ); ventrally with 24−35 ciliate chaetae on each side ( Fig. 27 ). Dens with 24−34 smooth inner spines; basal chaetae (bs1 and bs2) spiniform, bs1 shorter than bs2 ( Fig. 28 ). Mucro bidentate with subapical tooth larger than apical one; tip of basal spine slightly exceeding apex of subapical tooth; distal smooth section of dens shorter than mucro in length ( Figs 29 –30).

Ecology. Found in rotten leaves, mainly composed of Mallotus apelta and Rhus chinensis .

Etymology. Named after its locality: Hangzhou City.

Remarks. The new species is characterised by smooth chaetae e and l1 on labial base, two irregular transverse stripes on Abd. IV, absence of blue pigment on Ant. I−II, Abd. I−II and presence on Ant. III−IV. It is similar to the Chinese species H. xianjuensis Wu and Pan, 2016 in having smooth labial chaetae e and l1, colour pattern on antennae and Abd. IV, but there are great differences between them, such as, colour pattern on head and Abd. II−III, and number of mac on posterior part of Abd. IV. It is also similar to H. formosana Uchida, 1943 and H. hexaseta Pan, Shi and Zhang, 2011 in smooth chaetae e and l1 on labial base and absence of pigment on thorax but can be distinguished from the latter two species by the colour pattern on Abd. IV and other characters ( Table 1).

Figures

FIGURE 2 Homidia hangzhouensis sp. nov. 2, habitus. Scale bar: 500 μm.

FIGURES 22−23. Homidia hangzhouensis sp. nov. dorsal chaetotaxy. 22, Abd. IV; 23, Abd. V. Scale bars: 22 = 100 μm; 23 = 20 μm.

FIGURES 24−29. Homidia hangzhouensis sp. nov. 24, anterior face of ventral tube. 25, posterior face and lateral flap of ventral tube; 26, manubrial plaque (a circle with a slash designates a pseudopore); 27, ventro-apical part of manubrium; 28, proximal section of dens; 29, mucro. Scale bars: 24−29 = 20 μm.