• Source: Cyclocosmia

Cyclocosmia is a genus of mygalomorph trapdoor spiders in the family Halonoproctidae, first described by Anton Ausserer in 1871. Originally placed with the Ctenizidae, when the family split in 2018, this genus was placed with the Halonoproctidae as the type genus. The name is derived from the Greek "kyklos" (κυκλος), meaning "circle", and "kosmeo" (κοσμεω), meaning "to adorn".




Description


C. ricketti females are 28 millimetres (1.1 in) long, with a disk diameter of 16 millimetres (0.63 in). Their burrows are 7 to 15 centimetres (2.8 to 5.9 in) deep, and only the bottom portion of the burrow is silk lined.
These are trapdoor spiders, whose species are distinguished from each other by the pattern of the abdominal disk, the number of hairs on its seam, and the shape of the spermathecae. They have abdomens that are abruptly truncated, ending in a hardened disc that is strengthened by a system of ribs and grooves. They use this to clog the entrance of their burrows when threatened, a phenomenon called phragmosis. The disks have strong spines around the edge, and they each have four spinnerets just anterior to it. The posterior, retractable spinnerets are particularly large.




Species


As of April 2019 it contains ten species:

Cyclocosmia lannaensis Schwendinger, 2005 – China, Thailand
Cyclocosmia latusicosta Zhu, Zhang & Zhang, 2006 – China, Vietnam
Cyclocosmia liui Xu, Xu & Li, 2017 – China
Cyclocosmia loricata (C. L. Koch, 1842) – Mexico
Cyclocosmia ricketti (Pocock, 1901) – China
Cyclocosmia siamensis Schwendinger, 2005 – Thailand, Laos
Cyclocosmia sublatusicosta Yu & Zhang, 2018 – China
Cyclocosmia subricketti Yu & Zhang, 2018 – China
Cyclocosmia torreya Gertsch & Platnick, 1975 – USA
Cyclocosmia truncata (Hentz, 1841) (type) – USA




References






Further reading


Schwendinger, Peter J. (2005): Two new Cyclocosmia (Araneae: Ctenizidae) from Thailand. Revue Suisse de Zoologie 112(1): 225-252




External links



Cyclocosmia at Bugguide.net
Cyclocosmia close up

Kata Kunci Pencarian:

• Cyclocosmia
• Cyclocosmia ricketti
• Cyclocosmia truncata
• Phragmosis
• Cyclocosmia loricata
• Torreya trap-door spider
• List of trapdoor spiders
• Spider
• Halonoproctidae
• List of Halonoproctidae species