Homidia apigmenta
publication ID |
https://doi.org/ 10.5281/zenodo.193472 |
DOI |
https://doi.org/10.5281/zenodo.5678754 |
persistent identifier |
https://treatment.plazi.org/id/03BF7511-FFB2-FFF3-FF1C-08D5FB31D61E |
treatment provided by |
Plazi |
scientific name |
Homidia apigmenta |
status |
sp. nov. |
Homidia apigmenta n sp.
Figs 1–22 View FIGURES 1 – 2 View FIGURES 3 – 11 View FIGURES 12 View FIGURES 13 – 22 , Table 1 View TABLE 1
Type material. Holotype, female on slide, CHINA: Fujian Province: Shaowu City, Shunchang Country, 22. x. 2008, collection number S 08102206, collected by Zhi-Xiang Pan & Xin Qi. Paratypes, 9 females and 2 males on slide and 15 in alcohol, same data as holotype. Four paratypes (2 on slide and 2 in alcohol) deposited in Nanjing University and others (9 on slide and 13 in alcohol) in School of Life Sciences, Taizhou University, China.
Description. Size. Maximum body length up to 3.7 mm.
Colour pattern. Ground colour pale in alcohol ( Figs. 1–2 View FIGURES 1 – 2 ). Eye patches dark blue and with transverse band in front of eyes. Antennae pigmented and gradually darker towards tip. Lateral margin of Th. II–III and coxa slightly pigmented. No pigment on body, legs and furcula.
Head. Eyes 8+8; G and H smaller than others, and sometimes invisible under light microscope ( Fig. 3 View FIGURES 3 – 11 ). Antenna 2.5–3.1 times as long as cephalic diagonal; antennal segment ratio as I:II:III:IV=1:1.3–1.7:1.3– 1.7:1.6–2.8. Basal Ant. I with 3 dorsal and 4 ventral spiny straight setae ( Fig. 4 View FIGURES 3 – 11 ). Distal Ant. II with 3–4 rodlike sensory setae ( Fig. 5 View FIGURES 3 – 11 ). Ant. III organ with 2 rod-like sensilla ( Fig. 6 View FIGURES 3 – 11 ). Ant. IV apical bulb bilobed ( Fig. 7 View FIGURES 3 – 11 ). Dorsal cephalic chaetotaxy (following Szeptycki 1973) with 3 antennal (A), 3 ocellar (O) and 5 sutural (S) macrochaetae ( Fig. 3 View FIGURES 3 – 11 ). Labral papillae absent. Prelabral and labral setae as 4/5, 5, 4, all smooth. Maxillary outer lobe with 1 apical seta, 1 subapical seta and 3 sublobal hairs on sublobal plate; subapical seta subequal in length to and slightly thicker than apical one ( Fig. 8 View FIGURES 3 – 11 ). Five papillae A–E on labial palp (following Fjellberg 1998) respectively with 0, 5, 0, 4, 4 guard setae; lateral process differentiated being thick as normal with tip not reaching apex of the same papilla ( Fig. 9 View FIGURES 3 – 11 ). Setal formula of labial base usually as M, R, E, L1 and L2 (supplementary seta of M rarely present) (following Gisin 1964); seta E smooth and others ciliate; seta M slightly expanded; setae L1 and L2 strongly expanded and leaf-like; partial setae posterior to labium also strongly expanded ( Figs. 12 View FIGURES 12 a and 12b).
Thorax. Th. II with 4 medio-medial (m1, m2, m 2i, m 2i 2), 3 medio-sublateral (m4, m 4i, m4p), 27–31 posterior setae and 3 s-chaetae; p 4i 2 sometimes absent; p6 as mesochaeta. Th. III with about 40 macrochaetae and 2 s-chaetae; macrochaeta p4 absent ( Fig. 10 View FIGURES 3 – 11 ). Coxal macrochaetal formula as 3/4+1, 3/4+2 ( Fig. 11 View FIGURES 3 – 11 ). Trochanteral organ with 33–43 smooth spiny setae ( Fig. 13 View FIGURES 13 – 22 ). Inner differentiated tibiotarsal setae slightly ciliate, most distal smooth seta present on hind leg. Tenent hair clavate and slightly longer than inner edge of unguis. Unguis with 4 minute inner teeth and 2 lateral teeth. Unguiculus lanceolate with outer edge slightly serrate ( Fig. 14 View FIGURES 13 – 22 ).
Abdomen. Abd. I with 10 (11) (a1–3, m2–4, m 2i, m 4i, m4p, a5; a1a sometimes absent) macrochaetae and 2 s-chaetae. Abd. II with 6 (a2, a3, m3, m3e, m3ea, m3ep) central, 1 (m5) lateral macrochaetae and 2 schaetae. Abd. III with 2 (a2, m3) central, 4 (am6, pm6, m7a, p6) lateral macrochaetae and 3 s-chaetae ( Fig. 15 View FIGURES 13 – 22 ). Abd. IV with 6–9 macrochaetae on anterior part, arranged in irregular transverse row; posterior part with 4 (A6, Ae7, B4, B5) macrochaetae and 1 (B6) mesochaeta; Ae7 sometimes as mesochaeta ( Fig. 16 View FIGURES 13 – 22 ). Abd. V with 3 s-chaetae; m3a and a 5i sometimes absent ( Fig. 17 View FIGURES 13 – 22 ). Anterior face of ventral tube with many ciliate setae, including 4+4 as macrochaetae, line connecting proximal (Pr) and external-distal (Ed) (following Chen & Li 1997) macrochaetae oblique to median furrow ( Fig. 18 View FIGURES 13 – 22 ); posterior face with 5–8 (mostly 5) subapical smooth and numerous ciliate setae ( Fig. 19 View FIGURES 13 – 22 ); lateral flap with 6–7 smooth and 13–18 ciliate setae ( Fig. 18 View FIGURES 13 – 22 ). Manubrial plaque with 3 pseudopores, 2 inner and 7–12 outer ciliate setae ( Fig. 20 View FIGURES 13 – 22 ). Dentes with 18–39 spines; basal setae (following Szeptycki 1973) bs1 and bs2 spiny and multilaterally ciliate, bs1 slightly shorter than bs2; proximal-inner seta (pi) ciliate, apparently thinner, slender and longer than bs1 and bs2 ( Fig. 21 View FIGURES 13 – 22 ). Mucro bidentate with subapical tooth obviously larger than apical one; basal spine short, with tip only reaching apex of subapical tooth ( Fig. 22 View FIGURES 13 – 22 ). Tenaculum with 4+4 teeth and 1 large, multi-laterally ciliate basal seta. Genital plate papillate.
Ecology. In leaf litter of bamboo forest.
Etymology. Named after the unpigmented body.
Remarks. The new species is characterized by colour pattern with pigment absent on dorsal body tergites, leaf-like modified setae on ventral side of the head, presence of macrochaeta a1 on Abd. I, and absence of macrochaeta A4 and A5 on posterior side of Abd. IV.
It is most similar to H. polyseta in having expanded modified setae L1 and L2 and smooth E on ventral side of the head, claw structure, mucro, chaetotaxy on Abd. II and Abd. III, and macrochaetae on anterior face of ventral tube. It can be distinguished from the latter by absence of pigment on body, cephalic chaetotaxy, modified seta M on submentum, coxal macrochaetae formula, absence of A4 on Abd. IV, longer seta pi on dental base and fewer dental spines. It is also similar to H. latifolia , H. qimenensis , H. ziguiensis in having expanded modified setae ventrally on head, chaetotaxy of Abd. II–III, claw structure and mucro; however, it differs from them by colour pattern, having expanded modified M, L1 and L2 on labium, and in the macrochaeta A4 on Abd. IV. Differences between the new species and the other four similar species are listed in Table 1 View TABLE 1 .
Position of line connecting 4+4, oblique 3+3, oblique 3+3, oblique 3+3, oblique 4+4, subparellel
macrochaetae Pr and Ed to
median furrow of ventral tube
Distribution in China Fujian Hunan Zhejiang Anhui, Anhui Guangxi,
Jiangsu,
Zhejiang, Fujian
H. apigmenta . n. sp. | H. polyseta | H. latifolia | H. qimenensis | H. ziguiensis | |
---|---|---|---|---|---|
Labial basal seta M S Labial basal seta M | rarely present expanded | present normal | present normal | absent normal | present slightly expanded |
Labial basal seta L1 | expanded | expanded | normal | normal | slightly expanded |
Labial basal seta L2 | expanded | expanded | normal | normal | slightly expanded |
Cephelic chaetotaxy | 3A, 3O, 5S | 4A, 3O,6S | 3A, 3O, 5S | 3A, 3O, 5S | 3A, 3O, 6S |
Macrochaeta A4 Abd. IV | absent | present | present | present | present |
Dental spines | 18–39 | 47–64 | 21–38 | 39–54 | 42–66 |
Dental basal seta pi | slender | spiny, thick | slender | spiny, thick | spiny, thick |
Comparison of dental basal setae in length | pi> bs2> bs1 | bs2> bs1> pi | pi> bs2> bs1 | bs2> bs1> pi | pi> bs2> bs1 |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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