Glenognatha tangi ( Zhu, Song & Zhang, 2003 ) Jimmy Cabra-García & Antonio D. Brescovit, 2016

Jimmy Cabra-García & Antonio D. Brescovit, 2016, Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae), Zootaxa 4069 (1), pp. 1-183 : 39-45

Glenognatha tangi ( Zhu, Song & Zhang, 2003) new combination

( Figs. 25–30 , 131 )

Dyschiriognatha tangi Zhu, et al. 2003 : 207, figs. 113 A –G, 114 A –F ( female holotype from Yongning county, Guangxi province, China, 22º42´N, 108º24´E, 6.xii.1982, Zhang Yongquiang leg., deposited in HU, not examined ; Paratypes: 1♂ from Jinghong county , Yunnan province, China, 22º00´N, 100º48´E, 10.vii.1983, Zhu Chuandian leg., deposited in HU, not examined , 5♀ 1♂ paratypes from Nanning city, Guangxi province , China, 22º48´N, 108º18´E, 11.xii.1986 Zhang Yongquiang leg., deposited in HU, 1♂ and 1♀ examined ); World Spider Catalog 2015.

Transfer justification. Study of the D. tangi male paratype and other specimens from Myanmar shows that this species has all the synapomorphies of the genus Glenognatha . The conductor ( Figs. 27B–C , 28H–I ), the embolus ( Fig. 27D , 28H ), the paracymbium ( Fig. 28G ) and the female genitalia ( Fig. 28A–C ) exhibit the typical Glenognatha morphology.

Diagnosis. Males and females of G. tangi resemble those of G. dentata and G. argyrostilba by the presence of pore-bearing and setae-bearing depressions on the lateral surface of the carapace ( Figs. 29 A, E–F ). Males can be distinguished from the former by the absence of tooth-like projections on the conductor lamina ( Fig. 28H ) and from the latter by the shape of the conductor lamina which is not sinuous in ventral view ( Fig. 28H ). Females can be distinguished from both species by the smooth sternum ( Fig. 25G ) and the absence of setae-bearing tubercles on the antero-ectal surface of the chelicerae ( Figs. 26D–F ).

Description. Male and female described by Zhu et al. (2003). Additional data.

Male ( Myanmar, USNM). Habitus as in Figures 25 A –D . Cephalothorax with pore-bearing and setae-bearing depressions ( Figs. 29 A, E–F ). Cephalothorax 0.70 high. Abdomen 1.05 high. Sternum 0.45 long, 0.50 wide, smooth ( Fig. 29D ). Chelicerae as in Figures 26 A –C . Cheliceral fang outgrowth well-developed ( Fig. 26 A ). Epiandrous fusules as in Figure 30C . Spinnerets as in Figures 30D–F . Palp as in Figure 27 .

Female ( Myanmar, USNM). Habitus as in Figures 25E–H . Cephalothorax with pore-bearing and setae-bearing depressions. Cephalothorax 0.75 high. Abdomen 1.47 high. Sternum 0.50 long, 0.50 wide, smooth ( Fig. 25G ). Chelicerae as in Figures 26D–F . Genitalia with well-developed spermathecae ( Figs. 28 A –C ). UE entire ( Figs. 28 A –B ).

Variation. Male total length 1.9–2.2 (N = 4; average 2.1), cephalothorax length 0.8–1.1 (N = 4; average 0.9), femur I length 0.9–1.2 (N = 4; average 1.1).

Distribution. Known from Guangxi and Yunnan provinces in China and Sagaing region in Myanmar ( Fig. 131 ).

Remarks. The examined female paratype of D. tangi is a specimen of G. dentata . Due to the impossibility to obtain additional loan of type series females of D. tangi , the identification of the female of this species was based on the original description ( Zhu et al. 2003) and a female specimen from Myanmar which has a very similar habitus to G. tangi males stored in the same vial ( Figs. 25E–H ). The characters used in the key of Zhu et al. (2003) to distinguish females of G. tangi from G. dentata (e.g. carapace color, gonopore width and spermathecae shape oval or spherical) can be variable due to intraspecific variation or conservation artifacts. Accordingly, we propose new characters to diagnose G. tangi females.

Additional material examined (N= 5). New records. MYANMAR: Sagaing: Chattin Wildlife Sanct. Takontaing, 23º37´20´´N, 95º31´52´´E, elev. [179m], 7–12.x1998, J. Coddington & R. Baptista leg., 1♀ 3♂ 1 immature ( USNM).

Figures

FIGURE 25. Glenognatha tangi from Myanmar (USNM). A – D, male habitus. A, dorsal (arrow, lateral depressions). B, lateral. C, ventral (arrow, pleural bar). D, frontal. E – H, female habitus. E, dorsal (arrow, lateral depressions). F, lateral. G, ventral (arrow, pleural bar). H, frontal. Scale bars, 200 µm. TS: posterior tracheal spiracle.

FIGURE 26. Glenognatha tangi from Myanmar (USNM). A – C, male left chelicerae. A, anterior. B, posterior. C, mesal. D – F, female left chelicerae. D, anterior. E, posterior. F, mesal. Scale bars, 100 µm. CFO: Cheliceral fang outgrowth. Prt: promarginal tooth.

FIGURE 27. Glenognatha tangi from Myanmar (USNM). A – D, male left palp, schematic. A, ventral. B, conductor, ventral. C, conductor, dorsal. D, embolus, ventral. E – H, male left palp. E, ventral. F, dorsal. G, prolateral. H, retrolateral. Scale bars, 100 µm. C: conductor. CB: cymbium. CRa: conductor retrolateral apophysis. E: embolus. EMg: embolic medial groove. P: paracymbium. T: tegulum. TO: tarsal organ.

FIGURE 28. Glenognatha tangi. A – C, female genitalia (USNM). A, dorsal. B, ventral. C, lateral. D – F, male left palp. D, ventral. E, dorsal. F, anterior. G, paracymbium. H – I, embolus and conductor. H, ventral. I, dorsal. Scale bars, 100 µm (A – F), 1 0 µm (G – I). C: conductor. CB: cymbium. CD: copulatory duct. CRa: conductor retrolateral apophysis. E: embolus. EMg: embolic medial groove. MC: membranous chamber. P: paracymbium. S: spermathecae. T: tegulum. TO: tarsal organ. UE: uterus externus.

FIGURE 29. Glenognatha tangi. Male cephalothorax. A, lateral (white and black boxes define areas of figures E and F, respectively). B, frontal. C, dorsal. D, ventral. E, lateral cuticle (arrows, setae-bearing depressions). F, cuticle detail (arrows, pore-bearing depressions). Scale bars, 100 µm (A – D), 20 µm (E – F).

FIGURE 30. Glenognatha tangi. A – C, male abdomen. A, ventral. B, posterior tracheal spiracle (box defines are of figure M). C, epiandrous fusules. D – F, male spinnerets. D, ALS. E, PMS. F, PLS. G – J, male leg I. G, femur (arrows, trichobothrial bases). H, tibia (arrows, trichobothrial bases). I, metatarsus (box defines area of figure L). J, tarsus. K, male leg metatarsus IV. L, metatarsus I trichobothrium. M, cuticle horizontal bars. Scale bars, 100 µm (A, G – I, K) 20 µm (J), 10 µm (B – F, L – M). AC: aciniform gland spigots. AG: aggregate gland spigots. FL: flagelliform gland spigot. MAP: major ampullate gland spigot. mAP: minor ampullate gland spigot. PI: piriform gland spigots. TO: tarsal organ. TS: posterior tracheal spiracle.

FIGURE 131. Distribution of G. argyrostilba, G. tangi, G. dentata and G. smilodon.