Paracondeellum paradisum Bu & Yin sp. nov. Figures 2, 3, 4; Tables 2, 4

Diagnosis.

Paracondeellum paradisum sp. nov. is characterized by two pairs of A -setae on tergite I, one pair of A -setae, and eight pairs of P -setae on tergites II–VI, absence of A -setae and P2a seta on tergite VII, tergites IX and X with 12 and 10 setae, respectively, absence of seta d4 on dorsal side of head, and female squama genitalis short, with conical acrostylus.

Material examined.

Holotype, female (slide no. HN-SY-P2017016) (SNHM), China, Hainan, Sanya City, Yalong Bay Tropical Paradise Forest Park, soil of the tropical rain forest, 200 m elev., 18.25°N, 109.63°E, 22-III-2017, Y. Bu collector. Paratypes, 1 female (slide no. HN-SY-P2017071) (SNHM), same data as holotype.

Description.

Holotype: body length 570 μm, yellow-brown, foretarsus darker (Fig. 4A).

Head. Elliptic, length 80 μm, width 50 μm (Fig. 2A). Head setae short, rostrum slightly protruded. Setae d6 and sd6 present, d4 and sd4 absent, d6 and d7 length 6 μm and 7 μm respectively. Pores cp and fp present. Pseudoculus oval, without lever, length 8 μm, width 6.5 μm . PR = 10 (Fig. 2B). Canal of maxillary gland short, with globular calyx and short sausage-like posterior dilation. CF = 10 (Figs 2C, 4B). Labial palpus well developed, with four setae and apical tuft, without basal sensillum (Fig. 2D). Maxillary palpus with two subequal seta-like sensilla (Fig. 2E).

Foretarsus. Length 31 μm, claw length 9 μm, TR = 3.4; empodium length 2 μm, EU = 0.22. Dorsal sensilla t-1 and t-2 slender and long, BS = 0.63; t-3 short and spatulate, not reaching base of claw (Fig. 2G). Exterior side with only sensilla a, b and f present; a spatulate, b and f short (Fig. 2F). Interior sensilla a’ and c ' short sward-like, b ' absent. Relative length of sensilla: t-2> t-1> c'> t3> a> a'> (b = f) (Fig. 2F, G). Length of middle tarsus 15 μm; claw length 10 μm . Length of hind tarsus 17 μm; claw length 12 μm .

Thorax. Thoracic chaetotaxy given in Table 2. Setae 1 and 2 on pronotum subequal in length, 6 μm and 7 μm respectively (Fig. 2H); mesonotum with seven pairs of posterior setae, P5a minute; metanotum with six pairs of posterior setae, P5a absent; setae P1, P1a, P2 on mesonotum 6 μm, 1 μm, 7 μm, respectively; P1a on meso- and metanotum short, pin-shaped (Fig. 2H). Prosternum without seta A2. All setae on thoracic sternites of normal shape. Pores on thorax not observed.

Abdomen. Abdominal chaetotaxy given in Table 2. Tergite I with two pairs of anterior setae (A1, A5) and six pairs of posterior setae, A5 short, sensillum-shaped (Fig. 2I). Tergites II–VI with one pair of anterior (A1) and eight pairs of posterior setae, P2a present and P3a absent (Figs 2J, 3A, 4E, F). Tergite VII without anterior setae and with eight posterior setae, P2a absent and P3a present (Figs 3B, C, 4E, F). Accessory setae P1a on tergites I–V short pin-shaped (4 μm), on tergites VI–VII normal (5 μm). Accessory setae P2a and P4a always pin-shaped, 2 μm in length. P3a on tergite VII of normal shape and 5 μm long (Fig. 4E, F). Tergite VIII with two pairs of anterior setae (A1, A3) (Fig. 4C). Posterior central seta Pc present on sternites IV–VII, sensillum shaped, 4-5 μm long (Figs 3A, C, 4F). P1a on sternites IV–VI short, pin-shaped (Fig. 3A), on sternite VII setiform (Fig. 3C).

Tergites I–VII with pores psm and al (Fig. 2I, J), VIII with pores psm only, IX–XI without pores, XII single median pore. Sternites I–VI each with single posteromedial pore spm (Figs 3A, 4F), VII with three posteromedial pores (Figs 3C, 4F), VIII with single posteromedial pore (Fig. 4D), IX–XI without pores, XII with one pair of anterolateral sal pores.

Abdominal appendages typical of the genus. Subapical setae and apical setae on appendage III 11 μm and 5 μm long respectively. Striate band on abdominal segment VIII reduced to a single serrate line (Fig. 4D). Comb on abdomen VIII rectangular, with 10 teeth, 10 μm wide (Fig. 2K). Female squama genitalis short, with conical acrostylus (Fig. 2L).

Etymology.

Latin “paradisum”, after "Paradise Forest Park" where type specimens were collected.

Distribution.

China (Hainan)

Remarks.

The genus Paracondeellum Yin, Xie & Zhang, 1994 is endemic to China and was previously known by a single species, P. dukouense, from Sichuan and Yunnan provinces. Paracondeellum paradisum sp. nov. differs from P. dukouense in the shape of foretarsal sensilla, pseudoculus, and female squama genitalis, and in the body chaetotaxy. A comparison of the morphology of these two species is given in Table 4.