Trilacuna Tong & Li 2007
Creators: name: Wang, Ying
name: Tong, Yanfeng
name: Bian, Dongju
name: Li, Shuqiang
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Oonopidae
Trilacuna

description: Key to species of the genus Trilacuna occurring in China
(females of T. angularis and T. cuneata unknown)
1 (0) Males............................................................................................. 2
- Females.......................................................................................... 15
2 (1) Epigastric region strongly elevated (e.g., Fig. 6H; Liu et al. 2019: fig. 1E; Tong et al. 2019: figs 1I, 4I, 7I, 19I).......... 3
- Epigastric region flat................................................................................. 8
3 (2) Epigastric region with a long wedge-shaped scape (Liu et al. 2019: fig. 1E, F)................... T. cuneata Tong, 2019
- Epigastric region without the long wedge-shaped scape...................................................... 4
4 (1) Epigastric region with four long, very thick setae; sternum with many short, italic thick setae (Tong et al. 2019: fig. 4E, H, I)....................................................................... T. datang Tong, Zhang & Li, 2019
- Without the above-mentioned characters.................................................................. 5
5 (4) Epigastric region with a cluster of densely short seta (Fig. 6G).................................. T. wenfeng sp. nov.
- Epigastric region without the above-mentioned character.................................................... 6
6 (5) Sternum with several grooves on posterior part (Tong et al. 2019: fig. 1E)............. T. bawan Tong, Zhang & Li, 2019
- Sternum without grooves on posterior part................................................................ 7
7 (6) Sternum with a cluster of short setae on posterior part; embolus system with comb-like prolateral lobes (Tong et al. 2019: figs 19E, 20B)............................................................... T. xinping Tong, Zhang & Li, 2019
- Sternum without cluster of short setae on posterior part; embolus system without comb-like prolateral lobes, but with rows of lobes in basal ventral groove and a large distal plate (Tong et al. 2019: figs 7E, 8C)..... T. fugong Tong, Zhang & Li, 2019
8 (2) Embolus system with two very long, strongly curved outgrowths (Tong et al. 2018: fig. 2C, D)................................................................................................. T. simianshan Tong & Li, 2018
- Embolus system without the above-mentioned character..................................................... 9
9 (8) Palpal tibia with numerous, very long, penniform setae on prolateral surface and two long, strong setae on retrolateral surface; posterior part of sternum with two elevated ridges, each covered with a row of short, strong setae (Tong et al. 2018: figs 6E, 7C, D)....................................................................... T. songyuae Tong & Li, 2018
- Without the above-mentioned characters................................................................. 10
10 (9) Sternum with many rows of small ridges on posterior area (Tong et al. 2019: figs 13E, 16E)........................ 11
- Sternum without small ridges on posterior area........................................................... 12
11 (10) Embolus system with four long, finger-like lobes and two distal broad lobes prolaterally (Tong et al. 2019: fig. 17B)............................................................................... T. wuhe Tong, Zhang & Li, 2019
- Embolus system with two narrow, blade-like lobes prolaterally (Tong et al. 2019: fig. 14B)................................................................................................ T. longling Tong, Zhang & Li, 2019
12 (10) Endites distally slightly branched; embolus system with three long, tooth-like lobes prolaterally (Tong et al. 2019: figs 10E, 11B, D)............................................................... T. gongshan Tong, Zhang & Li, 2019
- Endites distally strongly branched; embolus system without three long, tooth-like lobes prolaterally................. 13
13 (12) Embolus system with a broad sickle-shaped branch prolaterally (Figs 2C, 3E)....................... T. difeng sp. nov.
- Embolus system without a broad sickle-shaped branch prolaterally............................................ 14
14 (13) Base of embolus system strongly bulged prolaterally (Tong & Li 2007: fig. 15)............. T. angularis Tong & Li, 2007
- Base of embolus system not bulged (Tong & Li 2007: fig. 9)............................. T. rastrum Tong & Li, 2007
15 (1) Surface of sternum strongly rugose (Tong et al. 2019: fig. 6E)...................... T. datang Tong, Zhang & Li, 2019
- Surface of sternum not strongly rugose.................................................................. 16
16 (15) Surface of sternum reticulated (e.g., Fig. 4D; Tong et al. 2018: figs 5E, 10E).................................... 17
- Surface of sternum smooth, or slightly rugose on middle part................................................ 19
17 (16) Middle part of posterior margin of epigastric scutum strongly extended posteriorly; endogyne with a very long, nearly coneshaped structure (Tong et al. 2018: figs 5H, I)..................................... T. simianshan Tong & Li, 2018
- Posterior margin of epigastric scutum smoothly curved, not strongly extended posteriorly; endogyne with a small globular shaped structure (e.g., Fig. 5A, B; Tong et al. 2018: figs 10H, I).............................................. 18
18 (17) Epigastric region with a pair of large dark knob; globular structure of endogyne very small (Tong et al. 2018: fig. 10H, I).............................................................................. T. songyuae Tong & Li, 2018
- Epigastric region without large dark knob; globular structure of endogyne large (Fig. 5A, B)........... T. difeng sp. nov.
19 (16) Surface of sternum slightly rugose on middle part (Tong et al. 2019: figs 15E, 18E).............................. 20
- Surface of sternum smooth........................................................................... 21
20 (19) Middle part of anterior margin of postgastric scutum smooth (Tong et al. 2019: fig. 24I)................................................................................................... T. longling Tong, Zhang & Li, 2019
- Middle part of anterior margin of postgastric scutum arch-shaped (Tong et al. 2019: fig. 25A)................................................................................................. T. wuhe Tong, Zhang & Li, 2019
21 (19) Endogyne with a posterior horseshoe-shaped sclerite (Tong et al. 2019: fig. 24F)........ T. fugong Tong, Zhang & Li, 2019
- Endogyne without horseshoe-shaped sclerite............................................................. 22
22 (21) Endogyne with only a transverse bar (Fig. 5D; Tong et al. 2019: fig. 25D)...................................... 23
- Endogyne with two transverse sclerites, i.e., an anterior transverse sclerite and a posterior transverse bar.............. 24
23 (22) Transverse bar of endogyne nearly straight (Fig. 5D).......................................... T. wenfeng sp. nov.
- Transverse bar of endogyne strongly curved (Tong et al. 2019: fig. 25D)............. T. xinping Tong, Zhang & Li, 2019
24 (22) Recurved arches of epigastric region weakly sclerotized (Tong et al. 2019: fig. 24G, H).................................................................................................. T. gongshan Tong, Zhang & Li, 2019
- Recurved arches of epigastric region strongly sclerotized (Tong et al. 2019: fig. 24A)............................. 25
25 (24) Transverse bar of endogyne straight; ALE separated by about 1.0 times their diameter; clypeus height about 1.1 times ALE diameters (Tong et al. 2019: fig. 3H).......................................... T. bawan Tong, Zhang & Li, 2019
- Transverse bar of endogyne curved; ALE separated by about 1.3 times their diameter; clypeus height about 2.0 times ALE diameters (Tong & Li 2007: fig. 5)................................................. T. rastrum Tong & Li, 2007
description: Published as part of Wang, Ying, Tong, Yanfeng, Bian, Dongju & Li, Shuqiang, 2021, Two new species of the genus Trilacuna from Chongqing Municipality, China (Araneae, Oonopidae), pp. 431-443 in Zootaxa 4927 (3) on pages 432-433, DOI: 10.11646/zootaxa.4927.3.6, http://zenodo.org/record/4542368