Paracortina inflata, Chen & Zheng & Jiang, 2023

Chen, Hui-Ming, Zheng, Chang-Bin & Jiang, Xuan-Kong, 2023, The millipedes (Diplopoda) in Yintiaoling National Natural Reserve, Southwest China, Zootaxa 5257 (1), pp. 49-81 : 54-57

publication ID 10.11646/zootaxa.5257.1.6

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scientific name

Paracortina inflata

sp. nov.

Paracortina inflata sp. nov.

Figs 7–10 View FIGURE 7 View FIGURE 8 View FIGURE 9 View FIGURE 10

Type materials. Holotype male: China, Chongqing, Wuxi County, Yintiaoling National Nature Reserve, Hongqi , Longtan Cave , 31°30’40.73” N, 109°49’40.93” E, alt. 1677 m, 14 August 2022, X.K. Jiang & H.M. Chen leg. GoogleMaps Paratypes: 5 males and 9 females, same data as holotype GoogleMaps ; 1 male and 2 females, Yintiaoling National Nature Reserve , Hongqi, a manual tunnel under the Shuangtong Dam, 31°31’16.83” N, 109°49’51.84” E, alt. 1458 m, 14 August 2022, X.K. Jiang & H.M. Chen leg. GoogleMaps

Etymology. This specific name is an adjective Latin word, meaning ‘inflated’ and refers to the shape of the prefemoroidal lateral processes of the gonopod.

Diagnosis. This species can be distinguished from other congeneric species by the large and inflated prefemoroidal lateral processes of the gonopod ( Figs 9A, C View FIGURE 9 ; 10A, C View FIGURE 10 ) (vs. clavate or stick-like in other species) and the particular shape of the apex of the gonopod ( Figs 9D View FIGURE 9 , 10D View FIGURE 10 ).

Description. Adult males body length 46–50 mm, width 2.8–3.0 mm, 56–58 pleurotergites + telson. Adult females body length 48–52 mm, width 3.1–3.4 mm, 57–60 pleurotergites + telson. Body coloration uniformly light brownish ( Figs 7 View FIGURE 7 , 8 View FIGURE 8 ).

Head convex, as broad as pleurotergite 5, covered with minute setae. Eyes with ca. 55 pigmented ocelli in 8 or 9 horizontal rows ( Fig. 8A View FIGURE 8 ). Organ of Tömösváry small, about 2–3 times larger than an ocellus, situated close to anteroventral side of eye. Antennae slender, reaching the posterior edge of PT6; length of antennomeres: 2=3>4=5>6>7>1; tip of antennomere 7 with four cones ( Fig. 8A View FIGURE 8 ). Collum much narrower than head ( Fig. 7 View FIGURE 7 ). pleurotergites 6 and 7 in males strongly enlarged ( Fig. 8A View FIGURE 8 ). Crests on collum and metazona moderately developed, 5+5 primary crests distinct, some secondary crests inconspicuous, 5–8 +5–8 ( Figs 7 View FIGURE 7 , 8B View FIGURE 8 ), and ca. 12 small crests down to ventral pleurotergal edge. 3rd primary crest strongly enlarged ( Fig. 8B View FIGURE 8 ). Ozopores starting with pleurotergite 6, present until penultimate pleurotergite, placed on tip of 3rd primary crest. Setal pattern as in Table 1 View TABLE 1 . Axial line rather distinct ( Fig. 8B View FIGURE 8 ). Epiproct simple, rear part with ca. 30 long setae in 3–4 transverse rows. Anal valves smooth, each divided into a small triangle and a large sclerite, both with a pair of macrosetae. Spinnerets comparatively thin and long, ending with a long macroseta. Hypoproct tripartite, medial sclerite largest, subrectangular, bearing two paramedian macrosetae; each lateral sclerite with a single macroseta ( Fig. 8C View FIGURE 8 ). Male leg-pairs 1 and 2 evidently shorter, leg-pair 3 slightly shorter than midbody legs. Midbody legs about twice as long as pleurotergite height. Coxal sacs present from 3rd at least to leg-pair 18, but most abraded. Coxae 2 with a gonopore posteriorly, opening from a small cone. Coxae 7 normal without mesal spine; prefemora slightly incrassate. Tarsal pads small, present from 3rd to about leg pair 21.

Gonopod coxae freely connected through a medial membranous lamina. Coxa strongly broadened, bearing a large, broad anterior process, tapering apically, near the length of telopodite ( Figs 9A–C View FIGURE 9 , 10A–C View FIGURE 10 ). Prefemur with two processes. Lateral process inflated and drop-shaped, densely setose, about half the length of telopodite ( Figs 9A, C View FIGURE 9 ; 10A, C View FIGURE 10 ). Inner process small, base with several setae ( Figs 9C View FIGURE 9 , 10C View FIGURE 10 ). Femoroidal stem long, slender, directed cephalad. Subterminal part of femoroidal stem broadened, forming a complex tip with ten apices ( Figs 9A–C View FIGURE 9 , 10A–C View FIGURE 10 ). One dorsal and one ventral process located subterminal part directed basally. Terminal part trifid ( Figs 9D View FIGURE 9 , 10D View FIGURE 10 ). Dorsal branch with two apices, basal one short and straight, directed mesally and distal one strongly bent, with a sharp tip. Ventral branch with three tips and a small apical lobe. A broad and rounded lobe located below the two branches. Seminal groove ending on the ventral branch.

Female. Slightly larger than males, pleurotergites 2 and 3 strongly enlarged. Leg pairs 1 and 3 with tarsal pads. Leg pair 1 strongly reduced in size. Leg pair 2 normal. All legs with unmodified coxae. Cyphopods small, densely setose ( Fig. 9E View FIGURE 9 ).

Distribution. Known only from the type locality.

Remarks. The family Paracortinidae contains two genera and 14 species, distributed in Southwest China (Yunnan and Sichuan) and Vietnam ( Liu & Tian 2015). The new species described here is the most northeast one on record, significantly expanding the distribution range of this family.

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