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Mysmena wawuensis

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Mysmena wawuensis is a species of spider found in China. It grows to 0.75 millimetres long. It is named after the Wawu Mountain National Forest Park in Sichuan Province in southwestern China where it was discovered and first described in 2013 by Yucheng Lin and Shuqiang Li. It was collected from the leaf litter at an altitude of 1,929 metres (6,329 ft) and is only known from the type locality.[2][3][4][5]

Description

Measuring just 0.75 mm (0.03 in) long, Mysmena wawuensis is one of the smallest spiders known.[3] The carapace is round in the male and pear-shaped in the female. The cephalothorax is brown with dark margins, the sternum is black and the disproportionately large opisthosoma is black, with yellow flecks.[6]

References

  1. ^ "Taxon details Mysmena wawuensis Lin & Li, 2013". World Spider Catalog. Natural History Museum Bern. Retrieved 2016-04-13.
  2. ^ Li, Shuqiang. "Mysmena wawuensis". EurekAlert!. Pensoft Publishers. Retrieved 16 June 2013.
  3. ^ a b "Two Amazingly Tiny Spider Species Found in China". Sci-News.com. Retrieved 16 June 2013.
  4. ^ "Wild Fact #16 – The Newly Discovered Spider – Mysmena wawuensis". Wild Facts. Retrieved 16 June 2013.
  5. ^ Crew, Becky (12 June 2013). "Two new species of Chinese spider are positively weeny". Scientific American. Retrieved 16 June 2013.
  6. ^ Lin, Yucheng; Li, Shuqiang (12 May 2013). "Two new species of the genera Mysmena and Trogloneta (Mysmenidae,Araneae) from Southwestern China" (PDF). ZooKeys. Pensoft Publishers. Retrieved 16 June 2013.
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Mysmena wawuensis: Brief Summary

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Mysmena wawuensis is a species of spider found in China. It grows to 0.75 millimetres long. It is named after the Wawu Mountain National Forest Park in Sichuan Province in southwestern China where it was discovered and first described in 2013 by Yucheng Lin and Shuqiang Li. It was collected from the leaf litter at an altitude of 1,929 metres (6,329 ft) and is only known from the type locality.

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Description

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Male (holotype). Somatic characters see Fig. 1A–C. Coloration: Prosoma brown centrally, dark marginally. Sternum black. Opisthosoma black, with tiny yellow speckles. Measurement: Total length 0.60. Prosoma 0.36 long, 0.35 wide, 0.32 high. Opisthosoma 0.36 long, 0.32 wide, 0.39 high. Clypeus 0.12 high. Sternum 0.25 long, 0.21 wide. Length of legs [total length (femur + patella + tibia + metatarsus + tarsus)]: I 1.14 (0.36, 0.14, 0.25, 0.18, 0.21); II 0.97 (0.30, 0.13, 0.21, 0.14, 0.19); III 0.76 (0.21, 0.11, 0.13, 0.13, 0.18); IV 0.93 (0.29, 0.13, 0.20, 0.14, 0.17). Prosoma (Fig. 1A, C): Carapace near round. Cephalic pars elevated, sharply vertical forward and slope backward. Ocular area at apex, dark. Eight eyes in two rows. AME black, others white. ALE and PLE contiguous. AME smallest, ALE largest. ARE slightly procurved, PRE straight. Chelicerae yellow, small, as long as endites (Fig. 1C). Legs: Femora pale yellow, other segments yellow proximally, gray distally. Leg formula: I-II-IV-III. Leg I with a distal metatarsal clasping macroseta prolaterally on 1/3 position. Leg I and II with a subdistal sclerotized femoral spot ventrally. Patellae I–IV with a dorsal seta distally. Tibiae I–IV with a dorsal seta proximally, and with 3 trichobothria. Metatarsi I–IV with only one trichobothrium. Opisthosoma (Fig. 1A–C): Globular dorsally. Spinnerets dark, the anteriors larger than the posteriors. Colulus indistinct. Anal tubercle grey. Pedipalp (Figs 2–3, 5–6): Femur long, with a subdistal macroseta ventrally (Figs 2A–B, 5A–B). Patella short, with a few setae. Tibia swollen, bowl-shaped, covered with long setae on distal margin ventrally and dorsally (Figs 3D–E, 6D–E). Cymbium membranous, wide, arisen from tibial margin ventrally (Fig. 6E), paracymbium attached with long setae along prolateral margin, a sclerotized cymbial process subdistally, a row of setae on cymbial fold subdistally and a primary cymbial conductor distally (Figs 3D–E, 6D–E). Tegulum rugose, translucent (Figs 2C, 3A–C). Spermatic duct visible through subtegulum (Figs 3A–C, 6A–C). Embolus long, thin and sparal (Figs 3C, 6C), coiling into four loops. Embolic end exceeded apex of cymbium (Figs 2C, 5A–C). Female (one of paratypes). Somatic characters see Fig. 1D–F. Coloration: Same as in male. Measurement: Total length 0.75. Prosoma 0.36 long, 0.32 wide, 0.30 high. Opisthosoma as in male, 0.54 long, 0.50 wide, 0.61 high. Clypeus 0.05 high, distinctly lower than in male. Sternum 0.23 long, 0.21 wide. Length of legs [total length (femur + patella + tibia + metatarsus + tarsus)]: I 1.05 (0.34, 0.14, 0.21, 0.16, 0.20); II 0.93 (0.29, 0.13, 0.18, 0.14, 0.19); III 0.77 (0.23, 0.11, 0.13, 0.13, 0.17); IV 0.99 (0.30, 0.13, 0.20, 0.16, 0.20). Prosoma (Fig. 1D, F): Carapace near pear-shaped. Cephalic part lower than in male. Eyes arrangement, chelicerae and endites as in male. Legs: Color, number of trichobothria same as in male, except for leg I without distal metatarsal clasping macroseta prolaterally. Sclerotized femoral spot present at leg I and II as in male. Leg formula: I-IV-II-III. Opisthosoma (Fig. 1D–F): Globose dorsally. Spinnerets grey, the anteriors larger than the posteriors. Colulus small, pale. Epigynum (Figs 4, 7): Large, weakly sclerotized, darkish. Epigynal area covered with short setae (Fig. 4B). A small, sclerotized scape stands on epigynal posteromargin mesially (Fig. 4B–C). Spermathecae short clubbed, weakly sclerotized, twisted, attached with membranous, rugose accessory bursae (Figs 4C, 7C). Fertilization ducts short, connected with spermathecae and accessory bursa. Copulatory ducts long, curved, weekly sclerotized, derives from inner side of spermathecae ventrally (Figs 4C, 7C).
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Yucheng Lin, Shuqiang Li
bibliographic citation
Lin Y, Li S (2013) Two new species of the genera Mysmena and Trogloneta (Mysmenidae, Araneae) from Southwestern China ZooKeys 303: 33–51
author
Yucheng Lin
author
Shuqiang Li
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Distribution

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Known only from the type locality (Fig. 13).
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Yucheng Lin, Shuqiang Li
bibliographic citation
Lin Y, Li S (2013) Two new species of the genera Mysmena and Trogloneta (Mysmenidae, Araneae) from Southwestern China ZooKeys 303: 33–51
author
Yucheng Lin
author
Shuqiang Li
original
visit source
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Zookeys