GUIDE TO COMMON SPIDERS
IN BORNEO ISLAND
EDA SAWMILL 21-11-2014 FRI 8:46AM
CONTAINER 28-11-2014 FRI 8:32AM
Classification: Family Pholcidae,
Crossopriza lyoni is a widespread species of cellar
spiders that prefer to live in or around human structures. They are
commonly known as tailed cellar spiders, tailed daddy longlegs
spiders, and sometimes box spiders. They all possess extremely long
fragile legs that can reach up to 6 cm (2.4 in) long and a body
length of that ranges from 2.5 to 7 mm (0.098 to 0.276 in). Their
abdomens are distinctly squarish when viewed from the side and their
carapace is more or less circular when viewed from above. They also
possess two kinds of sound-producing organs and have six eyes.
They also possess two types of stridulatory organs. The first type
is located at the posterior tips of their cephalothorax (the prosoma)
in the form of two triangular protrusions. The spiders rub these
structures with a matching pair of sclerotized plates at the
anterior portion of the abdomen, producing sound. These structures
are more prominent in females. They also possess stridulatory files
(in the form of a series of small ridges) on their chelicerae which
are rubbed against the pedipalps to produce sound. The second type
is more prominent in males.
Male Crossopriza lyoni spiders are recognizable by the enlarged pedipalps.
Male bulbous pedipalps
|Cephalothorax = The united head and thorax.
Carapace = The
hard dorsal covering of the cephalothorax.
The cephalothorax is wider than it is long, greyish-white to pale amber in color.
The carapace is subcircular. In the middle of the upper surface is a deep depression (thoracic fovea) and a darker longitudinal band of color.
|The legs are grey to amber in
colour and covered with
numerous small longitudinal brown spots.
The 'knee joints' are brown, and the ends of the femur and tibiae are girdled with white.
|Crossopriza lyoni possess extremely long fragile legs.
Females have slightly shorter legs than males.
|This females of Crossopriza lyoni is 5 mm in length. (Image
Males are slightly smaller, at about 2.5 to 6 mm (0.098 to 0.236 in) in length, and have prominent pedipalps.
|Crossopriza lyoni has two types:
1- 6 eyes Crossopriza lyoni
The Crossopriza lyoni found in Borneo Island are 8 eyes.
The eyes are pearly-white in color and located at the tip of the
cephalothorax in two groups of three.
|Abdomen is boxy shape
The characteristic boxy shape of their abdomens (C. cylindrogaster has a cylindrical abdomen)
The abdomen (the opisthosoma) is gray with white lateral stripes and various dark and light patches on the sides and the upper surface. An irregular darker stripe runs lengthwise at the bottom surface. The abdomen is angular and somewhat box-shaped, with a small conical hump on the upper back.