Paracondeellum dukouense (Tang & Yin, 1988)

Bu, Yun, Xiong, Yan, Luan, Yun-Xia & Yin, Wen-Ying, 2019, Protura from Hainan Island, China: new species, checklist and distribution, ZooKeys 879, pp. 1-21 : 6-11

Paracondeellum dukouense (Tang & Yin, 1988) Figures 3 , 5 ; Tables 3 , 4

Diagnosis.

Paracondeellum dukouense (Tang & Yin, 1988) is characterized by the one pair of A -setae on tergite I, absence of A -setae and P1a seta on tergites II–VI, absence of A -setae and nine pairs of P -setae (P2a present) on tergite VII, tergites IX and X with 14 and 12 setae respectively, absence of seta d4 on head, and female squama genitalis with pointed acrostylus.

Material examined.

Lectotype, female (slide no. 1), paralectotype, female (slide no. 2) (SEM), China, Sichuan, Dukou City (currently, Panzhihua City), Jinjiang County, soil under grass, 1155 m elev., 26.55N, 101.85E, 26-IX-1985, B.W. Tang and G.T. Jin collectors. We designated as the lectotype the female on slide no. 1 and the other female on slide no. 2 as the paralectotype.

Redescription.

Body length of holotype 880 μm and paratype 720 μm; yellow-brown, with foretarsus darker ( Fig. 5A ).

Head. Elliptic, length 93-100 μm, width 70 μm. Dorsal setae longer than subdorsal and lateral ones, rostrum slightly protruded ( Fig. 5C ). Setae d6 and sd6 present, sd6 sensillum-shaped; d4 and sd4 absent; d6 and d7 11 μm and 6 μm long, respectively ( Fig. 5C ). Pores cp and fp present. Pseudoculus round, without lever, length 13 μm, width 11 μm. PR = 7.2-7.7 ( Fig. 5C ). Canal of maxillary gland short, with globular calyx and sausage-like posterior dilation. CF = 13.3-14.3 ( Fig. 5B ). Labial palpus well developed, with four setae and apical tuft, without basal sensillum. Maxillary palpus with two subequal sensilla.

Foretarsus. Length 46-50 μm, claw length 15-17 μm, TR=2.9-3.1; empodium length 4-5 μm, EU=0.24-0.33. Dorsal sensilla t-1 and t-2 slender and long, BS=0.66; t- 3 short sward-like, nearly reaching base of claw ( Fig. 3D ). Exterior slide with only sensilla a, b and f present; a spatulate, b and f short sward-like ( Fig. 3D ). Interior sensilla a ' and c ' short sward-like, b ' absent ( Fig. 3E ). Relative length of sensilla: t-2> t-1> c'> a> t3> a'> (b = f) ( Fig. 3D, E ). Length of middle tarsus 20 μm; claw length 12 μm. Length of hind tarsus 23 μm; claw length 15 μm.

Thorax. Thoracic chaetotaxy given in Table 3 . Setae 1 and 2 on pronotum subequal in length, 10 μm long; mesonotum with seven pairs of posterior setae, P5a minute; metanotum with six pairs of posterior setae, P5a absent; setae P1, P1a, P2 on mesonotum 10 μm, 1.5 μm, 14 μm respectively; P1a on meso- and metanotum short, pin-shaped. Prosternum with anterior seta A2 ( Fig. 5D ), meso- and metasternum each with four posterior setae ( Fig. 5E ), metasternum with six anterior setae. All setae on sterna normal. Pores on thorax not detectable.

Abdomen. Abdominal chaetotaxy given in Table 3 . Tergite I with one pair of anterior setae (A5) and six pairs of posterior setae, A5 short, sensillum-shaped. Tergites II–VI without anterior setae and seven pairs of posterior setae, P2a present, P1a and P3a absent ( Fig. 5F ). Tergite VII without anterior setae and with nine pairs of posterior setae, both P2a and P3a present ( Fig. 5G ). Accessory setae P2a and P4a on tergites II–VII short, sensillum-shaped, 4 μm in length, P1a and P3a on tergites VII normal, 9 -10 μm in length ( Fig. 5F, G ). Tergite VIII with three pairs of anterior setae (A1, A3, A5) and seven pairs of posterior setae, P3a short (5 μm) ( Fig. 5G, K, L ). Posterior central seta Pc present on sternites IV–VII slender, 8-9 μm long ( Fig. 5 H–J ). P1a on sternites IV–VI short pin-shaped, 2 μm long ( Fig. 5H, J ), on sternite VII as normal seta, 9 μm long ( Fig. 5I ). Sternites IX and X with short P3a seta ( Fig. 5L ), which had been omitted in original description.

Tergites I–VII with pores psm and al, VIII with pores psm only, IX–XI without pores, XII with single median pore. Pores on sternites I–VI not observed due to the opacity of the old specimens ( Fig. 5H, J ); three posteromedial pores observed on sternite VII ( Fig. 5I ), VIII with posteromedial pore ( Fig. 5L ), IX–XI without pores, XII with one pair of sal pore.

Abdominal appendages typical of the genus. Subapical setae and apical setae on appendage III 12-13 μm and 6-8 μm long, respectively. Striate band on abdominal segment VIII reduced to a single serrate line ( Fig. 5G, K, L ). Comb on abdomen VIII rectangular, with 10 teeth, 12-13 μm wide ( Fig. 5K ). Female squama genitalis short, with pointed acrostylus.

Etymology.

Named for Dukou City (now Panzhihua City, Sichuan Province) where type specimens were collected.

Distribution.

China (Sichuan, Yunnan).

Remarks.

Paracondeellum dukouense was originally described based on two syntypes ( Tang and Yin 1988). In the original description ( Tang and Yin 1988) and in the monograph of Yin (1999), most important characters such as foretarsal sensilla, pseudoculus, maxillary gland, as well as body chaetotaxy were briefly described and illustrated. After careful study of type specimens under a modern phase contrast microscope with higher resolution, we find that sensillum c ' is present on the foretarsus and that some of the setae on the body were previously ignored due to the lower resolution of the microscope used. We correct here these mistakes in the original description and supplement the description of head chaetotaxy, the porotaxy, and the shapes of setae on the body. Table 4 compares P. dukouense with the new species.

Figures

Figure 3. A-C Paracondeellum paradisum sp. nov., holotype A sternite VI (spm = sternal posteromedial pore) B tergite VII, right side C sternite VII (spsm = sternal posterosubmedial pore). D-E Paracondeellum dukouense (Tang & Yin, 1988) holotype D foretarsus, exterior view E foretarsus, interior view. Arrows indicate pores. Scale bars: 20 μm.

Figure 5. Paracondeellum dukouense (Tang & Yin, 1988), holotype A habitus B canal of maxillary gland C head, dorsal view D prosternum E mesosternum F tergite VI G tergites VII-VIII H sternite VI I sternite VII J sternite V K tergites VIII-XII L sternites VIII-XII. Arrows indicate pores. Scale bars: 20 μm.