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A Guide to Common Singapore Spiders
by Joseph K H Koh
  Singapore Psechrus
Psechrus singaporensisThorell 1894
 
close-up of body
Female
Builds a three-dimensional web with a tent in the centre and a funnel-like retreat at one end. Hangs upside-down under the tent and escapes quickly into the retreat when disturbed.

Classification: Family Psechridae, Psechrid Spiders.
Habitat: Mud wall flanking jungle tracks.
Female: 15-17 mm.
Male: 15-16 mm.
Distribution: Singapore, Malaysia, Indonesia.
Egg-sacs are carried with the jaws of the mother.

Psechrids are long-legged spiders with cribellum and calamistrum.
The cribellum is a cigar-shaped plate on the underside of the abdomen, in front of the spinnerets. The upper margin of the second last segment (metatarsus) of the fourth leg is armed with a row of strongly curved spines known collectively as the calamistrum. The legs have three claws and have a tuft of hairs under the third claw.

The two genera in the family can be distinguished by the markings on the underside of the abdomen. In Psechrus, it has a white line in the middle. In Fecenia, the underside of the abdomen has a dark band which is constricted in the centre by a pair of white patches.
diagram of bodyUnderside of a female Fecenia macilenta,
showing the pattern and the cribellum (arrowed)
  From "A Guide to Common Singapore Spiders" by Joseph K. H. Koh
BP Guide to Nature Series published by the Singapore Science Centre and sponsored by British Petroleum
© 2000 Joseph K H Koh