Sinamma quadrata Tong & Li, 2022

Cheng, Weihua, Ren, Lingshu, Tong, Yanfeng, Bian, Dongju & Li, Shuqiang, 2022, Two new species of the spider genus Sinamma Lin & Li, 2014 (Araneae, Tetrablemmidae) from Guangdong Province, China, Zootaxa 5091 (3), pp. 443-454 : 444-448

publication ID	https://doi.org/ 10.11646/zootaxa.5091.3.4
publication LSID	lsid:zoobank.org:pub:0DE7087E-2D0B-472D-9919-7EC18D9BE3DC
DOI	https://doi.org/10.5281/zenodo.5848309
persistent identifier	https://treatment.plazi.org/id/03CD87B1-3A1F-FFDE-BFFA-FA9CFC98F85F
treatment provided by	Plazi
scientific name	Sinamma quadrata Tong & Li
status	sp. nov.

Treatment

Sinamma quadrata Tong & Li View in CoL , sp. nov.

Figs 1A–I View FIGURE 1 , 2A–I View FIGURE 2 , 3A, B View FIGURE 3 , 4A–C View FIGURE 4 , 8 View FIGURE 8

Type material. Holotype: Male (SYNU-497), near Donghua Temple (24º9'15.48"N, 113º26'36.6"E; elevation 157 m), Yingde City, Qingyuan City, Guangdong Province, China, 5 April 2021, W. Cheng, Y. Huang, K. Yang and T. Jiang leg. GoogleMaps Paratypes: 3 males (SYNU-498-500) and 5 females (SYNU-501-505), same data as holotype GoogleMaps .

Etymology. The specific name is an adjective and derives from the Latin word “quadratus”, referring to the quadrangular shape of the palpal bulb.

Diagnosis. Males of Sinamma quadrata sp. nov. resemble Sinamma oxycera Lin & Li, 2014 in having the conical cheliceral horn, the pointed eye tubercles and the strongly modified leg I. Females of the new species resemble Sinamma oxycera by the finger-shaped inner vulval plate. Males of Sinamma quadrata sp. nov. can be distinguished from Sinamma oxycera and S. yingae sp. nov. by the quadrangular shaped palpal bulb and the beltshaped embolus ( Fig. 2A, B View FIGURE 2 ) (vs pyriform-shaped palpal bulb and thread-like embolus in S. oxycera and S. yingae ( Lin & Li 2014: fig. 2A, B; Fig. 6A, B View FIGURE 6 )). Males of the new species also can be distinguished from S. yingae by having pointed eye tubercles ( Fig. 1G, H View FIGURE 1 ) (vs lacking pointed eye tubercles in S. yingae ( Fig. 5G, H View FIGURE 5 )). Females of the new species can be distinguished from S. oxycera Lin & Li, 2014 by lacking cephalic tubercles ( Fig. 1F, I View FIGURE 1 ) (vs with a pair of cephalic tubercles in S. oxycera ( Lin & Li 2014: fig. 1F, H)); from S. yingae sp. nov. by having fingershaped inner vulval plate ( Fig. 4C View FIGURE 4 ), the posterior part of sternum strongly bulged ( Fig. 1E, F View FIGURE 1 ) and the cephalic part slightly elevated ( Fig. 1F View FIGURE 1 ) (vs triangle-shaped inner vulval plate ( Fig. 7C View FIGURE 7 ), flat posterior part of the sternum ( Fig. 5E, F View FIGURE 5 ), and cephalic part slightly sloping, with the highest point of carapace at ocular area ( Fig. 5F View FIGURE 5 ) in S. yingae ).

Description. Male (holotype, SYNU-497). Coloration: body reddish-brown; legs yellowish brown. Measurements: total length 1.31; carapace 0.70 long, 0.57 wide, 0.43 high; abdomen 1.00 long, 0.73 wide, 0.62 high; clypeus 0.39 high; sternum 0.39 long, 0.41 wide. Length of legs: I 1.64 (0.55, 0.20, 0.36, 0.26, 0.27); II 1.51 (0.50, 0.19, 0.35, 0.25, 0.22); III 1.36 (0.41, 0.19, 0.33, 0.20, 0.23); IV 1.80 (0.55, 0.19, 0.45, 0.34, 0.27).

Carapace ( Fig. 1A, C, G, H View FIGURE 1 ): reticulated, strongly rugose, margin with small denticles; ocular area raised, eye tubercle long, sharp ( Fig. 1G, H View FIGURE 1 ); clypeus very high, anterior margin rounded ( Fig. 1G, H View FIGURE 1 ); cheliceral horn long, basally wide, distally crooked ( Fig. 1H View FIGURE 1 ); sternum with sparse setae, rugose ( Fig. 1B View FIGURE 1 ). Legs ( Fig. 3A, B View FIGURE 3 ): femur I swollen; tibiae I–III with 3 trichobothria, tibia IV with 4 trichobothria, and metatarsi I-IV with a trichobothrium; tibia I with one very small ventral tubercle (svt); metatarsus I with two distal tubercles (dt).

Abdomen ( Fig. 1B, C View FIGURE 1 ): booklung covers long oval, dark brown; dorsal scutum oval, finely reticulated; ventral scutum rugose; postgenital plate narrow, subequal in width to preanal plate ( Fig. 1B View FIGURE 1 ).

Palp ( Fig. 2A–I View FIGURE 2 ): femur smooth; patella approximately 1/2 femur in length, connected to tibia subbasally; bulb long, quadrangular; embolus long, belt-shaped, curved slightly, strongly sclerotized; sperm duct extending, visible through the bulbal integument.

Female (paratype, SYNU-501). Coloration: same as in male.

Measurements: total length 1.49; carapace 0.67 long, 0.53 wide, 0.33 high; abdomen 1.15 long, 0.81 wide, 0.70 high; clypeus 0.22 high; sternum 0.39 long, 0.40 wide. Length of legs: I 1.62 (0.55, 0.18, 0.37, 0.25, 0.27); II 1.51 (0.47, 0.18, 0.34, 0.25, 0.27); III 1.36 (0.39, 0.17, 0.31, 0.24, 0.25); IV 1.79 (0.54, 0.18, 0.46, 0.34, 0.27).

Carapace ( Fig. 1D, F, I View FIGURE 1 ): cephalic part slightly elevated ( Fig. 1F View FIGURE 1 ), clypeus lower than in male; cheliceral horn absent. Posterior part of sternum strongly bulged ( Fig. 1F View FIGURE 1 ). Legs as in male, except for leg I undecorated.

Abdomen ( Fig. 1E, F View FIGURE 1 ): ventral episgastric scutum rugose; postgenital plate straight, as wide as preanal plate; preanal plate rectangular-shape.

Genitalia ( Fig. 4A–C View FIGURE 4 ): epigynal fold wide ( Fig. 4A View FIGURE 4 ); vulval stem wide, strongly sclerotized; lateral horns slightly sclerotized, supporting the base of vulval ducts of spermathecae; inner vulval plate finger-shaped, slightly sclerotized ( Fig. 4C View FIGURE 4 ).

Distribution. Known only from the type locality ( Fig. 8 View FIGURE 8 ).