A third species of Parakermania Vandel, 1973 (Isopoda: Oniscidea: Armadillidae) from China Author Hong, Xinkai 0000-0003-3374-5044 College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China & xinkaihong 1999 @ 163. com; https: // orcid. org / 0000 - 0003 - 3374 - 5044 Author Wang, Yutao College of Tourism, Hainan Normal University, Haikou 571158, China Author Li, Weichun College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China text Zootaxa 2022 2022-01-07 5087 3 484 488 journal article 2751 10.11646/zootaxa.5087.3.5 b473c7cf-410c-49cc-ae98-65dfc7c51217 1175-5326 5826927 50F64BC1-4AEE-4B8D-A930-F42D449759A9 Parakermania longa sp. nov. Figs 1–2 Holotype . Male , CHINA : Hainan Island , Chengmai ( 19°43′N , 110°01′E ), a secondary broad-leaved forest near Road 303, 26.v.2021 , leg. Yutao Wang , prep. slide nos. L20182−20184 . Paratypes . Three males, two females , same collection data as holotype . Diagnosis. Body with thin and long ornamentations on outer sides of pereonite 6, conspicuously reaching beyond apex of telson. Description. Body length of males 2.0–3.0 mm, of females 3.0– 3.5 mm . Body elliptic, able to roll up into ball; head white, pale yellow mixed with pale brown on cephalon and around ommatidia, cephalon with frontal shield slightly protruding over vertex; dorsum pale brown mixed with pale yellow; each pereonite with six tubercles except for pereonite 7 with three tubercles, outer tubercles on pereonite 6 developed into two thin and long ornamentations going beyond apex of telson, median tubercle on pereonite 7 enlarged into thumb-shaped projection; epimera of pereonite 1 round, pereonites 2−7 with triangular epimera ( Fig. 1A–C ); pereonites 1 and 2 with small lobe and large tooth on ventral side ( Fig. 1D ). FIGURE 1. Parakermania longa sp. nov. A, habitus in life; B, holotype in dorsal view; C, holotype in lateral view; D, cephalon and pereon-epimera 1 and 2 of holotype in ventral view. Scale bars: 0.1 mm. Antennula composed of three articles, distal article bearing apical set of small aesthetascs ( Fig. 2A ). Antenna short and stout, second article of flagellum twice as long as first article ( Fig. 2B ). Mandibles with molar process reduces to single plumose seta ( Fig. 2C, D ). Maxillula with outer branch bearing 4+6 teeth, inner branch with two stout penicils ( Fig. 2E ). Maxilla distally bilobate, with inner lobe distinctly narrower than outer lobe ( Fig. 2F ). Maxilliped with three long setae on apical margin of endite, palp two-jointed ( Fig. 2G ). Pereopod 1 and 7 without particular modifications ( Fig. 2H, I ). Pleopods , sexual differentiation. Male pleopod 1 exopodite small bean-shaped, no visible respiratory structures ( Fig. 2J ); endopodite with broad basal part, narrowed towards apical tip, apex beak-shaped and covered with tiny spines ( Fig. 2K ). Pleopod 2 exopodite concave on outer margin, inner margin basally convex, narrowed towards apical tip ( Fig. 2L ); endopodite thin and long, distinctly longer than exopodite ( Fig. 2M ). Telson with nearly quadrangular distal part, distal part about half as wide as basal part, ending with convex apical margin; uropodal protopodite nearly trapezoidal, postero-lateral corners broadly rounded; minute exopodites inserted dorsally beneath small tooth ( Fig. 2N, O ). Distribution. China ( Hainan ). Etymology. The specific name is derived from the Latin longus = long, in reference to the species has two long ornamentations on the outer sides of the sixth pereonite. Remarks. This new species shares common derived characters with other two congeners ( P. minima Vandel, 1973 and P. maculata Kwon & Taiti, 1993 ) in having well-developed tubercles on dorsum of body, short and stout antenna, triangular epimera on pereonites 2−7, small lobe on ventrum of pereonite 1 and large ventral tooth on pereonite 2 ( Fig. 1 ). But it can be distinguished from the latter species by 39 dorsal tubercles on pereonites, and two outer tubercles on pereonite 6 developed into thin and long ornamentations reaching beyond apex of telson ( Fig. 1A–C ). In P. minima , pereonites have 63 dorsal tubercles, and outer tubercles on pereonites 1–6 developed into long spine-shaped projections, but not reaching telson ( Vandel 1973 : fig. 109). In P. maculata , dorsum of pereonites covered with 60 small rounded tubercles ( Kwon & Taiti 1993 : fig. 315).