taxonID	type	description	language	source
03A687AEFFDBFFA69BB3FBAADF61C221.taxon	materials_examined	Examined material: 1 female, China, Hainan Island (western coast), Changjiang County, vicinity of Changhua town, Qizi Bay, 19 ° 21 ' 12 " N, 108 ° 40 ' 25 " E, flotation of sand samples (Nos. 34, 35 and 38) on beach, 6 - IV- 2011, Y. Bu, C. W. Huang, M. B. Potapov and N. A. Kuznetsova leg.	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
03A687AEFFDBFFA69BB3FBAADF61C221.taxon	discussion	Remarks. This is the first record for China. Distribution covers the marine littoral environments. from Brazil, Cuba, Gambia, Bahrain, Malaysia (Sabah), Singapore, and Sri Lanka (Murphy, 1971). The species was described from Brazil and dedicated to Professor Paulo Sawaya (so the correct name is Pseudanurida sawayai and not P. sawayana, as originally described and cited in many articles). In the same year of Schuster’s description, Murphy (1965) characterized and illustrated a series of specimens from Gambia, including the complete dorsal chaetotaxy, which were identified as Pseudanurida cf. bogoyawlenskyi (Baker, 1905); however, later Murphy (1971) recognized that those specimens were actually of P. sawayai. The species was described from Brazil (Recife: Barra das Jangadas) in a creek connecting Rio Pirapama and Rio Jaboatão, a few km South of Piedade Marine Biol. Station, in mangroves; nevertheless after Murphy (1971) it also has been found in Gambia (West Africa) in mangroves and rocky shore; Sabah (North Borneo), Labuan on weed-covered rocks, small inlet inside Labuan town at low tide; Singapore, Pasir Ris, sparse mangroves by small stream; Bahrain, Persian Gulf, edge of inland, fresh-water stream (maybe of artesian origin); Ceylon, Mendel lake (a brackish lagoon on the West coast) and in Mannar, Giant’s tank (a large, inland, artificial fresh-water lake). It was found by Christiansen & Bellinger (1988) in mangroves of Puerto Rico, and also under and on rocks in Florida, USA. Now is has been found in sandy beach, so it seems that this species can live in different habitats.	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
03A687AEFFDBFFA59BB3F8A4DB42C631.taxon	materials_examined	Type species: Oudemansia coerulea Schött, 1893	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
03A687AEFFDBFFA59BB3F8A4DB42C631.taxon	diagnosis	Diagnosis. General aspect like Pseudachorutes. Labrum elongated, forming a beak with long distal setae, short proximal setae, with a total of 11 – 13 setae. Labium truncate. Hypopharynx well developed, bifid at the apical end. 8 eyes on each side, in three groups (4, 1 and 3), 3 ocular setae, postantennal organ absent. Mandible with one or two longitudinal rows of teeth on median edge. Maxilla styliform. Ant. III organ with two relatively long microsensilla, not in a groove, not covered by cuticular fold, guard sensilla short. Dorsal guard sensillum migrated towards Ant. IV. Ant. IV with trilobed apical bulb and one apical organite; ms absent. Usually with few cylindrical sensilla, no ventral sensorial file. Body chaetotaxy composed of only two rows of short smooth setae on each segment. Sensorial setae long. Body sensorial setae on Th. II and III are m 6 and p 4; on Abd. I – IV on p 5, in Abd. V on p 3. Some species with pseudocelli well developed on head, posterior to eye patch, and on Abd. I, III, and IV. No capitate tenent hairs on tibiotarsi. Claw moderately long, untoothed or armed with inner and / or lateral teeth. Ventral tube with 2 + 2 to 4 + 4 setae. Retinaculum with 3 + 3 teeth. Furcula short but well developed, mucro and dens fused, with 5 – 6 dental setae on posterior side. Abd. VI with 2 – 4 spines or spiniform setae. Colour black, dark blue, blue-red or purple. Length 0.8 – 2.0 mm. Inhabitants of marine littoral environments. (Delamare Deboutteville & Massoud, 1964).	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
03A687AEFFDBFFA59BB3F8A4DB42C631.taxon	distribution	Distribution. Indonesian Archipelago, Vietnam, Japan, China, Madagascar, Australia and United States of America.	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
03A687AEFFDBFFA59BB3F8A4DB42C631.taxon	discussion	Remarks. This is the only genus in the Subfamily Pseudachorutinae with anal spines. Mouthparts are very complex and the hypopharynx well developed; eyes separated in 3 groups. All members of this group are marine littoral inhabitants. There is a strong reduction of cephalic chaetotaxy and of body, with only two rows of setae on each segment.	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
03A687AEFFD8FFAD9BB3FCB5D8A7C6A5.taxon	description	Figs 1 – 23	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
03A687AEFFD8FFAD9BB3FCB5D8A7C6A5.taxon	materials_examined	Material examined. Type specimens: Holotype, female (slide no. 8 - 1) (SHNM), China, Hainan Province, Sanya city, sandy beach of Ximaozhou island, flotation of sand samples, 18 ° 14 ’ N, 109 ° 22 ’ E, 17 - III- 2011, Y. Bu and C. W. Huang cols. Paratypes: 1 female (slide no. 8 ‒ 2), same data of holotype; 5 females [slides no. 1 – 3 (UNAM), 6, 7, 11 (SHNM)], 1 male (slide no. 9) (SHNM), China, Hainan Province, Sanya city, sandy beach of Ximaozhou island, flotation of sand samples, 18 ° 14 ’ N, 109 ° 21 ’ E, 5 - IV- 2011, Y. Bu, C. W. Huang, M. B. Potapov and N. A. Kuznetsova cols. Additional material: 2 juveniles (slides no. 4, 5) (UNAM), 1 juvenile (slide no. 12) (SNHM), same locality data as holotype.	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
03A687AEFFD8FFAD9BB3FCB5D8A7C6A5.taxon	description	Description. Adult body length average (n = 8) 1.24 mm (range 0.99 – 1.51 mm). Color dark purple / black; intersegmental areas not developed on thorax, slightly on abdomen (Fig. 1). Cuticle with strong granulation (Fig. 2). One pair of pseudocelli on head close to seta p 5 (Figs 12, 14) and on abdominal segments I, III and IV close to sensorial setae (Figs 5, 19). Thorax and abdomen without paratergites. Antennae subequal to head length (about 220 µm). Ant. I – II – III + IV ratio = 1: 1.1; 1.3. Dorsal side of Ant. IV with trilobed apical bulb displaced subapically, close to subapical organite, both set in a tegumental depression; ms absent; only four well-differentiated sensilla (S 3, S 4, S 7 and S 8); S 1 and S 2 present but very thin and acuminate; small setae “ i ” and “ x ” present (Fig. 7). Ant. III organ with Sgd smaller and thinner than sensilla, displaced towards Ant. IV; internal microsensilla long, half-length of Sgv and freely exposed, ventral microsensillum present, Sgv slightly curved (Fig. 9). Ant. I and II with 7 and 11 setae respectively (Fig. 8). Head. Eyes 8 + 8 in three groups, one with eyes A, B, C and D, other with H and another with E, F and G; Oc 1 – 3, Oc 3 smaller than others (Figs 12, 13). PAO absent. Five dorsal cephalic setae (d 1 – 5), only four subdorsal setae (sd 2 – 5); p 1 – 3 present, p 2 smaller than others; without unpaired setae, v and c rows absent (Fig. 12). Labrum elongated as a beak, with strong proximal granulation (Figs 4, 11), four prelabral setae and 9 labral setae; formula: 4 / 3, 4, 2; similar to Pseudanurida, last two seta (a) longer and thicker than others (Fig. 11). Labral sclerotification with two slight apical short projections (Fig. 10). Mandible with two strong teeth, one basal and one median, 12 small apical teeth (Fig. 15); maxilla styliform (Fig. 16). Hypopharynx complex with two serrate lamella and 9 apical teeth (Figs 3, 15). Labium truncate apically, with C seta long and laterally displaced, setae A – B in normal position and D apically displaced, papillated seta L absent (Figs 3, 17). Two pairs of postlabial setae. Chaetotaxy composed of ordinary mesosetae of different size (smallest 11 µm) and long sensorial setae (62 µm), posterior setae becoming longer towards Abd. VI, ratio ordinary setae of row a: sensorial setae approximately 1: 4.3. Sensorial setae formula by half body: 022 / 11111 (Figs 12, 19). Th. I with 2 + 2 setae. Axial setae formula by half body: 122 / 22222; never with three rows of setae on any segment of body. Legs chaetotaxy I – III as follows: Subcoxa I – 1,2,2; Subcoxa II – 0,1,1; Coxa – 3,6,7; Trochanter – 6,6,6; Femur – 13,12,11; Tibiotarsus – 18,18,17, no tenent hairs, without M seta. Length of tita I – III 53, 54 and 58 µm respectively, ungues thick, with a strong basal inner tooth (Fig. 18). Ratio ungues III: Tita = 1: 1.2; ratio ungues III: mucro = 1.4. Abd. V with pairs of 5 dorsal setae, sensorial setae in p 3. Four anal spines, two a 1 (40 µm) and two a 2 (33 µm) (Figs 2, 19). Anal spine a 1 slightly curved, a 2 straight. Other setae on Abd. VI normal (not spiniform), m 1 longer than m 2. Ventral chaetotaxy. Thorax without ventral setae. VT with 2 + 2 setae; Abd. II with 2 + 2 ventro-internal setae. Tenaculum strong, with 3 + 3 teeth; Abd. III with 2 + 2 ventrointernal setae and 1 + 1 ventrolateral. Abd. IV with 4 + 4 ventro-lateral; 2 + 2 ventro-external and 1 + 1 ventro-internal seta (Fig. 20). Furcula complete and well developed; manubrium with 7 + 7 setae; dens short, with coarse granulation and 6 setae; mucro more than 1 / 3 of dens, no clear separation between them, slightly tapering with a small hooked apex; ratio mucro: dens; manubrium = 1: 2.3; 2.8 (Fig. 21). Female genital plate with 3 + 3 pregenital setae, 6 – 9 circumgenital setae and 2 eugenital setae (Fig. 22). Male genital plate with 3 + 3 pregenital setae, no circumgenital setae, but two circular organs, each with six short cylindrical structures similar to sensilla, 5 + 5 eugenital setae (Figs 6, 23). Ventral lateral anal valves with 14 + 14 setae and 3 hr microsetae (Fig. 20). Posterior anal valve with 3 ventral setae.	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
03A687AEFFD8FFAD9BB3FCB5D8A7C6A5.taxon	distribution	Distribution. China (Hainan). Only known from the type locality.	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
03A687AEFFD8FFAD9BB3FCB5D8A7C6A5.taxon	etymology	Etymology. This species name is dedicated to both Professor Jian-Xiu Chen, retired professor from Nanjing University and Professor Jian Chen from Hubei University of China, for their contributions to the knowledge of Collembola taxonomy and spider’s biology, respectively, and for their friendship and help given to the authors for many years.	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
03A687AEFFD8FFAD9BB3FCB5D8A7C6A5.taxon	discussion	Remarks. Oudemansia chenorum sp. nov. has small anal spines a 2 (a 1> a 2), so it seems related with Oudemansia subcoerulea Denis, 1948, O. dubia Denis 1947 and O. petiti Delamare Deboutteville & Massoud, 1964. Oudemansia petiti is similar to O. esakii Kinoshita, 1932 but differs in the number of manubrial setae (14 vs. 20). The new species has same kind of male genital organs as O. petiti but differ in the number of mandibular teeth, which are very numerous in P. petiti (20) and in two rows. In P. chenorum sp. nov. the anal spines have different length and seta a 3 is normal. Oudemansia petiti lacks Oc 2 and Oc 1 is short (very long in the new species) and one dental seta is distally displaced from the other five.	en	Palacios-Vargas, José G., Bu, Yun (2020): New records of Collembola from marine littoral sand of Hainan Island, China with description of a new Oudemansia species (Neanuridae: Pseudachorutinae). Zootaxa 4810 (1): 117-130, DOI: 10.11646/zootaxa.4810.1.6
