18/06/2014

Phát hiện hai loài Nhện mới Eupoa daklak, E. lehtineni

Copulatory organs and somatic characters of Eupoa daklak sp. n. 33 epigyne, ventral view 34 vulva, dorsal view 31 female body, dorsal view. Abbreviations as explained in ‘Material and methods’. Scale bars: 0.1 mm. Hình theo Zookeys. 2014.
(biodivn.blogspot.com) Mới đây, hồi tháng 5 - 2014, tạp chí Zookeys công bố một loài Nhện mới cho khoa học được phát hiện ở Buôn Ma Thuột, tỉnh Đắc Lắc, Việt Nam. Loài mới này có tên Eupoa daklak (Arachnida, Araneae, Salticidae - Họ Nhện), là loài nhện nhỏ chưa đến 1cm, tuy nhiên mẫu vật và thông tin về con đực vẫn chưa được ghi nhận. Ngoài ra, nhóm nghiên cứu còn mô tả một loài mới Eupoa lehtineni sp. n. được mô tả từ Thái Lan nhưng mẫu vật mô tả con cái được thu ở Khu bảo tồn Thiên nhiên Vĩnh Cửu, huyện Vĩnh Cửu, tỉnh Đồng Nai (biodivn.blogspot.com)

Eupoa daklak sp. n.
http://zoobank.org/EF8169C1-C2D9-45C3-BAC0-38DD65DBBD40
http://species-id.net/wiki/Eupoa_daklak
Type. Holotype ♀ (ZMUM) from Viet-Nam, Dak Lak Prov., c. 25 km SSW of Buon Ma Thuot (c. 12°26'48"N, 107°58'E), Dak Linh, 500 m a.s.l., 28-29.04.1986, L.N. Medvedev & S.I. Golovatch.
Etymology. The species epithet is a noun taken in apposition of the type locality: Daklak province of Viet-Nam.
Diagnosis. The central shallow depression of the epigyne of Eupoa daklak sp. n. (Fig. 33) is unique among all the Eupoa species known to us. The male of Eupoa daklak sp. n. remains unknown.
Comments. Although this species is described on the basis of a single female, it is highly unlikely that it could belong to one of the three other new species described below on the basis of males (Eupoa lobli sp. n. from Malaysia;Eupoa pappi sp. n. and Eupoa pulchella sp. n. from Thailand). All Eupoa species, as well as those of two closely related genera (Corusca and Sinoinsula), are litter-dwellers, with most of them (except for Eupoa lehtineni sp. n.) having small, local ranges. For instance, 22 distinct species of Corusca and Sinoinsula were recently described from Hainan Island of China alone. Therefore, it is safe to conclude that this and three other Eupoa species that are described herein on the basis of a single sex from very distant localities indeed belong to different species. Finally, there is no technical way to match this female with one of the males, unless they were collected together.
Distribution. The type locality only.
Description.
Male unknown.
FEMALE. Measurements. Carapace 0.89 long, 0.76 wide and 0.49 high at PLE. Ocular area 0.59 long, 0.77 wide anteriorly and 0.71 wide posteriorly. Diameter of AME 0.24. Clypeus height 0.07, chelicera length 0.29. Abdomen 1.06 long, 0.89 wide. Length of leg segments: I: 0.47 + 0.22 + 0.29 + 0.29 + 0.19; II: 0.41 + 0.19 + 0.23 + 0.23 + 0.19; III: 0.39 + 0.17 + 0.26 + 0.27 + 0.19; IV: 0.61 + 0.23 + 0.43 + 0.34 + 0.23. Leg spination. Leg I: Tb v 2-2-2ap; Mt v 2-2-2ap. Leg II: Tb v 2-2; Mt v 2-2-2ap. Leg III: Tb pr and rt 0-1-0; Mt pr 1-1ap, rt and v 1-0. Leg IV: Tb pr and rt 0-1-0; Mt pr 1-0-2ap, rt 1-0-1ap, v 1-0. Coloration (Fig. 35). Carapace yellow-brown, with brownish radial veins on thorax and yellow eye field. Blackened around eyes. Clypeus naked, yellow, with a brown marginal line. Sternum, maxillae, labium and chelicerae yellow, tinged with brown. All abdomen brownish yellowish, without a colour pattern. Book-lung covers yellow, tinged with brown. Spinnerets: anterior pair brownish, posterior pair pale yellow. All legs yellow, with poorly marked brownish patches at segment joints. Palps: femora and patellae brownish, metatarsi and tarsi yellow. Epigyne and vulva as in Figs 33–34: epigynal plate as a rounded shallow depression; insemination ducts thin and transparent; pear-shaped receptacles are close to each other, meeting up along the median line.

Eupoa lehtineni sp. n.
http://zoobank.org/ACCC403B-039D-4B0E-8EE1-4C9AA4458999
http://species-id.net/wiki/Eupoa_lehtineni
 
Copulatory organs and somatic characters of Eupoa lehtineni sp. n. 25 male palp, retrolateral view 26 ditto, median view 27 male tibial apophysis, retrolateral view 28 male palp, apical view 29 epigyne, ventral view 30 female carapace, ventral view 31 female spinnerets, ventral view 32 female abdomen, ventral view. Abbreviations as explained in ‘Material and methods’. Scale bars: 50 μm (27, 29), 0.1 mm (25–26, 28, 30–32). Hình theo Zookeys. 2014.
Types. 
Holotype ♂ (ZMTU) from India, Meghalaya, East Khasi Hills, Umran, riverside forest, 1200 m a.s.l., 4.05.1979, P.T. Lehtinen.
Paratypes: INDIA: 2♂5♀ (ZMTU), together with the holotype. – THAILAND: 3♂5♀ (MHNG, one male without abdomen and palp), Trat Prov., Ko Chang, west side (12°03'N, 102°18'E), WINKLER-extraction in secondary forest with primary spots (AS-T-5), 50-200 m a.s.l., 3-23.12.1999, A. Schultz; 1♀ (MHNG), Kanchanaburi Prov., Sai Yok Distr., Sai Yok National Park, near HQ, 100 m a.s.l., 21.07.1987, P.J. Schwendinger. – VIET-NAM: 1♀ (ZMUM), Dong Nai Prov., Vinh Cuu Dist., Vinh Cuu Nature Reserve (= Ma Da Forest), c. 6 km N of Ba Hao Vil. (c. 11°19'N, 107°05'E), 80 m a.s.l. (sample-5), 10.05.1995, T. Sergeeva; 1♀ (ZMUM), same locality (sample-11), 6.06.1995, T. Sergeeva.
Etymology.The species is named in honour of our colleague and friend, Dr Pekka Lehtinen (Turku, Finland), who collected the holotype.
DiagnosisBy the conformation of the large, round tegulum, the tibial apophysis and the thin compound terminal apophysis that is hidden in the apical cavity of tegulum (Figs 26), the male of Eupoa lehtineni sp. n. is most similar to that of Eupoa lobli sp. n., but can easily be distinguished by the shape of tegular and median apophyses. The female of Eupoa lehtineni sp. n. has the easily recognizable triangle epigynal plate (Figs 29) and the mutual arrangement and shape of receptacles.
Distribution. From eastern India, south-eastward to Thailand and southern Viet-Nam (present data).
Description.
MALE (from Thailand: Ko Chang). Measurements. Carapace 0.94 long, 0.79 wide and 0.51 high at PLE. Ocular area 0.61 long, 0.79 wide anteriorly and 0.77 wide posteriorly. Diameter of AME 0.24. Clypeus height 0.06, chelicera length 0.29. Abdomen 0.76 long, 0.58 wide. Length of leg segments: I: 0.44 + 0.22 + 0.30 + 0.26 + 0.16; II: 0.40 + 0.21 + 0.21 + 0.24 + 0.19; III: 0.38 + 0.18 + 0.22 + 0.27 + 0.20; IV: 0.59 + 0.23 + 0.41 + 0.30 + 0.23. Leg spination. Leg I: Mt v 2-2-2ap. Leg II with no spines. Leg III: Tb pr and rt 0-1-0. Leg IV: Tb pr and rt 0-1-0; Mt pr and rt 0-1-1-ap. Coloration. Carapace light grey-brown, with grey-yellow eye field and with poorly visible dark brown radial veins on thorax. Blackened around eyes. Clypeus naked, yellow-brown. Sternum light grey-brown. Maxillae, labium and chelicerae grey-yellow. Abdomen light grey-brown, dorsum completely covered with large scutum and with a thin longitudinal, medial yellow line. Book-lung covers light grey-brown. Spinnerets: anterior pair grey brownish, posterior pair yellow. All legs grey-yellow, with dark brown patches at segment joints, but patellae, tibiae and metatarsi I pro-ventrally with dark brown longitudinal stripe. Palp grey-yellow, its structure as in Figs 25–28: patellar apophysis short and obtuse; tibial apophysis blade-shaped, bent dorsad; tegulum well-developed, apically with prominent, hook-shaped tegular apophysis; median apophysis massive, directed ventrad; compound terminal apophysis thin and long, situated inside the apical cavity of tegulum; embolus coiled, making two revolutions, with its terminal end resting on top of the cymbium.
FEMALE (from Viet-Nam: Dong-Nai). Measurements. Carapace 0.93 long, 0.73 wide and 0.51 high at PLE. Ocular area 0.59 long, 0.75 wide anteriorly and 0.71 wide posteriorly. Diameter of AME 0.24. Clypeus height 0.06, chelicera length 0.33. Abdomen 0.89 long, 0.71 wide. Length of leg segments: I: 0.49 + 0.26 + 0.31 + 0.31 + 0.21; II: 0.39 + 0.21 + 0.23 + 0.26 + 0.18; III: 0.39 + 0.17 + 0.24 + 0.31 + 0.21; IV: 0.63 + 0.23 + 0.49 + 0.37 + 0.23. Leg spination. Leg I: Tb v 2-2-2ap; Mt v 2-2-2ap. Leg II: Tb pr 0-1-0, v 1-1; Mt v 2-2-2ap. Leg III: Tb pr 0-1-0, Mt pr 1-1ap, rt 1ap. Leg IV: Tb pr and v 0-1-0; Mt pr 2-0-2ap, rt 1-0-1ap. Coloration. Carapace pale brown, with yellow eye field and a thin longitudinal median line on thorax. Blackened around eyes. The entire carapace covered (not very densely) with white and transparent elongated scales. Clypeus naked, brown-yellow. Sternum yellow, tinged with brown. Maxillae, labium and chelicerae pale yellow. Abdomen: dorsum light brown, with a longitudinal medial yellow line; sides light brown, each with a wide yellow stripe; venter yellow. Anterior edge of carapace with a bunch of long brownish hairs. Book-lung covers yellow. Spinnerets: anterior pair brownish, posterior pair pale yellow. All legs yellow, with brownish (semi)rings at segment joints, but femora, patellae and tibiae I pro-ventrally with dark brown stripe. Palps: femora and patellae light brown, metatarsi and tarsi yellow. Epigyne and vulva as in Figs 29,: epigynal plate triangular, with obtuse tip directed anteriorly, covered with long whitish hairs; insemination ducts relatively short, subparallel and directed anteriorly; receptacles relatively small and rounded; receptacles and fertilization ducts situated in the anterior part of vulva.
Tài liệu tham khảo: Taxonomic notes on the genus Eupoa Żabka, 1985 (Arachnida, Araneae, Salticidae); Dmitri V. Logunov and Yuri M. Marusik; Zookeys. 2014; (410): 63–93. Published online May 21, 2014. doi:   10.3897/zookeys.410.7548.  

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