Liphistius pyinoolwin, Xu & Yu & Aung & Yu & Liu & Lwin & Sang & Li, 2021

Xu, Xin, Yu, Li, Aung, Khin Pyae Pyae, Yu, Long, Liu, Fengxiang, Lwin, Wai Wai, Sang, Men Zing & Li, Daiqin, 2021, A new species of Liphistius from Myanmar and description of the actual male of L. birmanicus Thorell, 1897 (Araneae, Mesothelae, Liphistiidae), ZooKeys 1031, pp. 41-58 : 41

publication ID	https://dx.doi.org/10.3897/zookeys.1031.59102
publication LSID	lsid:zoobank.org:pub:78C9CC2B-6D4E-4665-B2BD-E5CB05D09552
persistent identifier	https://treatment.plazi.org/id/781BD6EE-9EC1-4C53-944A-9F45E2F44AE9
taxon LSID	lsid:zoobank.org:act:781BD6EE-9EC1-4C53-944A-9F45E2F44AE9
treatment provided by	ZooKeys by Pensoft
scientific name	Liphistius pyinoolwin
status	sp. nov.

Treatment

Liphistius pyinoolwin View in CoL sp. nov. Figs 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7

Liphistius birmanicus Platnick & Sedgwick, 1984: 8 (only 2♂♂ 5♀♀ from Pyin Oo Lwin, Mandalay Region, Myanmar, alt. 1150 m; collected by W. Sedgwick on 13 July 1982; deposited in AMNH (2♂♂ 4♀♀; examined) and MCZ (1♀; not examined)), misidentification, partim; Schwendinger, 1990: 331-332 (illustration based on 2♂♂ 4♀♀ (AMNH)), misidentification.

Type material.

Holotype: Mynamar · ♂; Mandalay Region, Pyin Oo Lwin District, Pyin Oo Lwin township, Anesakhan Village, near Dat Taw Gyaint Waterfall Resort, the View Resort & Restaurant; 21.98°N, 96.38°E; alt. 908 m; 13 July 2018; D. Li, F.X. Liu, X. Xu and L. Yu leg.; XUX-2018-089. Paratypes: Myanmar · 7 ♂♂, 15 ♀♀; same data as for the holotype; XUX-2018-090, 093, 094, 096, 098, 099A, 102, 103, 103A, 104, 104A, 105, 106, 107-110, 110A, 110B, 110C, 111, 111A.

Other material: Myanmar · 1 ♂, 4 ♀♀ (AMNH; examined); Mandalay, Pyin Oo Lwin; alt. 1150 m; 13 July 1982; W. Sedgwick leg.; AMNH_IZC 00356855 (♂; matured on 14 October 1982, died on 23 February 1983), AMNH_IZC 00356856 (♀; moulted on 28 February 1983, died on 17 April 1983), AMNH_IZC 00356857 (♀; moulted on 27 January 1983, died on 14 February 1983), AMNH_IZC 00356858 (♀; died on 15 October 1982), AMNH_IZC 00356859 (♀; moulted on 6 November 1982, died on 1 March 1983).

Diagnosis.

Males of L. pyinoolwin sp. nov. can be distinguished from those of L. birmanicus , L. lahu Schwendinger, 1998, L. lordae , and L. pinlaung by the presence of a lateral process on the paracymbium (Figs 3A, H, I View Figure 3 , 4B View Figure 4 ); from those of L. birmanicus by the larger tibial apophysis (Fig. 3A, B, H, I View Figure 3 ), the plane cumulus (Figs 3A, B, H-J View Figure 3 , 4A View Figure 4 ), the smaller paraembolic plate (Figs 3A-J View Figure 3 , 4F, G View Figure 4 ), and the wider shorter contrategular process (Figs 3E View Figure 3 , 4F View Figure 4 ); from those of L. lahu by the narrower tegulum (Figs 3C, F, J View Figure 3 , 4F, G View Figure 4 ); from those of L. lordae by the wider tibial apophysis at base (Figs 3A, B, H, I View Figure 3 , 4B View Figure 4 ), and the shorter, less regularly arranged setae on the cumulus (Figs 3A, B, H, I View Figure 3 , 4A View Figure 4 ); from those of L. pinlaung by the tegulum with a slightly dentated margin (Figs 3C, F, J View Figure 3 , 4F View Figure 4 ). Females of L. pyinoolwin sp. nov. resemble those of L. birmanicus , L. hpruso and L. pinlaung by the poreplate with two pairs of lobes, but can be distinguished from those of L. birmanicus and L. pinlaung by the small, narrower posterior stalk (Figs 5D-I View Figure 5 , 6D, E, G, H View Figure 6 , 7B-I View Figure 7 ), as well as the narrower, longer receptacular cluster (Figs 5G-I View Figure 5 , 6G-I View Figure 6 , 7C, G-I View Figure 7 ); from those of L. hpruso by the poreplate with larger anterior lobes (Figs 5D-I View Figure 5 , 6D-I View Figure 6 , 7A-I View Figure 7 ); from those of the other Liphistius by the poreplate with four anterior lobes (Figs 5G-I View Figure 5 , 6G-H View Figure 6 , 7A-I View Figure 7 ).

Description.

Male (holotype). Total length, excluding chelicerae, 13.95. Carapace 6.03 long and 6.17 wide, black brown, furnished with a few short, scattered bristles. ALE>PLE>PME>AME, eye sizes and interdistances: AME 0.10, ALE 0.60, PME 0.21, PLE 0.42, AME-AME 0.07, AME-ALE 0.09, PME-PME 0.11, PME-PLE 0.08, ALE-PLE 0.09, ALE-ALE 0.06, PLE-PLE 0.36, AME-PME 0.09. Chelicerae robust, promargin of chelicerae groove with 12 strong denticles of variable size. Labium 0.61 long and 1.09 wide, wider than long, fused with sternum. Sternum 2.77 long and 1.03 wide, longer than wide, and a few weakly spined setae on the anterior tip and many long spined setae on the posterior tip, elongated posterior tip. Opisthosoma 6.71 long and 5.00 wide, black, with 12 tergites, the fifth largest, 8 spinnerets. Legs without distinct annulations. Superior tarsal claws of anterior legs with 3 or 4 teeth, of posteriors with 4. Measurements: leg I 15.73 (4.42 + 1.39 + 3.78 + 3.80 + 2.34), leg II 16.16 (4.31 + 1.36 + 3.49 + 4.38 + 2.62), leg III 18.09 (4.15 + 1.34 + 4.16 + 5.68 + 2.76), leg IV 23.69 (5.66 + 1.57 + 5.18 + 7.66 + 3.62).

Palp: Tibial apophysis very broad at base, with four long, stouter setae with similar lengths and a few short spines (Figs 3A-C, H-J View Figure 3 , 4A-C View Figure 4 ); paracymbium wide, with pointed lateral process and many setae situated at the tip, and several tapering spines on the plane cumulus (Figs 3A, B, H, I View Figure 3 , 4A View Figure 4 ); subtegular apophysis well developed (Figs 3C, F, J View Figure 3 , 4F, G View Figure 4 ); contrategulum with a conical, short, blunt-tipped process (Figs 3D-F View Figure 3 , 4E View Figure 4 ), distal edge widely arched, with a smooth sharp projection (Figs 3B, D, F, G View Figure 3 , 4F, G View Figure 4 ); tegulum small, with a slightly dentated margin (Figs 3C, F, J View Figure 3 , 4F, G View Figure 4 ); paraembolic plate short, widely rounded (Figs 3A-J View Figure 3 , 4E-G View Figure 4 ); embolus short conical, basally sclerotized, with 6 longitudinal ridges that reach the tip, embolic parts adjacent (Figs 3A-J View Figure 3 , 4C-G View Figure 4 ).

Female (XUX-2018-094, Fig. 2D View Figure 2 ). Total length, excluding chelicerae, 10.40. Carapace 4.79 long, 4.72 wide, light brown, furnished with few short, scattered bristles (Fig. 2D View Figure 2 ). Eight eyes on darkened ocular tubercle, ALE> PLE> PME> AME. Eye sizes and interdistances: AME 0.06, ALE 0.45, PME 0.19, PLE 0.35; AME-AME 0.08, AME-ALE 0.10, PME-PME 0.05, PME-PLE 0.10, ALE-PLE 0.05, ALE-ALE 0.10, PLE-PLE 0.33, AME-PME 0.06. Chelicerae light and glabrous proximally, robust, dark brown; promargin of chelicerae groove with 11-12 denticles of variable size. Labium 0.59 long, 1.25 wide. Sternum 2.55 long, 1.23 wide, light brown with several setae. Opisthosoma 5.44 long, 3.84 wide, brown, with 12 tergites, and 8 spinnerets. Legs brown with strong hairs and spines, long and short black sparse setae, with three tarsal claws. Measurements: palp 7.89 (2.84 + 1.05 + 1.98 + 2.02), leg I 10.16 (3.33 + 1.32 + 2.22 + 1.90 + 1.39), leg II 9.95 (3.15 + 1.07 + 2.14 + 2.03 + 1.56), leg III 11.10 (3.18 + 1.19 + 2.55 + 2.58 + 1.60), leg IV 15.60 (4.41 + 1.24 + 3.53 + 3.91 + 2.51).

Female genitalia: Posterior margin of genital sternite curved (Figs 5A-C View Figure 5 , 6A-C View Figure 6 , 7A View Figure 7 ); approximately rectangular poreplate wider than long, with a pair of large, well separated anterior lobes and a pair of small anterolateral lobes; the anterior lobes very close to the anterolateral lobes (Figs 5D-I View Figure 5 , 6D-I View Figure 6 , 7B-I View Figure 7 ); transition between poreplate and posterior stalk distinct (Figs 5D-I View Figure 5 , 6D, E, G, H View Figure 6 , 7B-I View Figure 7 ); posterior stalk long, narrow; racemose receptacular cluster long and narrow, central dorsal opening sphere-shaped (Figs 5D-F View Figure 5 , 6D-F View Figure 6 , 7D-F View Figure 7 ).

Etymology.

The species epithet " Liphistius pyinoolwin " is a toponym referring to the type locality.

Distribution.

Myanmar (Mandalay Region).

Variation.

Body size: males (N =8): BL 8.63-13.95, CL 4.23-6.03, CW 4.87-6.17, OL 3.76-6.71, OW 2.85-5.17; females (N =15): BL 10.40-14.21, CL 4.79-6.37, CW 4.55-5.91, OL 5.44-8.10, OW 3.84-6.27; The examined females have different genitalia, including the specimen XUX-2018-110, which lack the posterior stalk (Fig. 6F View Figure 6 , 6I View Figure 6 ); the shape of the anterior and anterolateral lobes of the poreplate is variable (Figs 5G-I View Figure 5 , 6G-I View Figure 6 , 7C View Figure 7 , 7G-I View Figure 7 ); In some specimens, the receptacular cluster is beyond the anterior margin of the poreplate dorsally (Figs 5D View Figure 5 , 6D View Figure 6 , 7A, D, E View Figure 7 ), whereas in others are not (Figs 5E, F View Figure 5 , 6E, F View Figure 6 , 7B, F View Figure 7 ), and the size and shape of the receptacular cluster may be slightly different (Figs 5G-I View Figure 5 , 6G-I, C, G-I View Figure 6 ); the shape and size of the central dorsal opening are also variable (Figs 5D-F View Figure 5 , 6D-F View Figure 6 , 7B, D-F View Figure 7 ).

Remarks.

We examined 8 males and 15 females collected from Pyin Oo Lwin by us, as well as 1 male and 4 females collected by W. Sedgwick on 13 July 1982, which were used to redescribe L. birmanicus by Platnick and Sedgwick (1984) and reviewed by Schwendinger (1990). After examined the male and females collected by W. Sedgwick, even though the male palp was distorted (Fig. 4A-C View Figure 4 ), we can still identify it as the same as the descriptions and illustrations by Platnick and Sedgwick (1984), and the same as the males and females collected by us at Pyin Oo Lwin.