Family Hersiliidae

Hersiliidae SUKAU

Hersilia SUKAU

Female
18mm with tails. Net body length is 9mm

10-9-2010 Sukau

Hersilia KNP

Hersilia KNP

Female

16-12-2009 Kinabalu National Park

Hersilia GERGASSI

Hersilia GERGASSI

Female 10mm with Tails. 5mm Net Body length

31-8-2009  GERGASSI

Hersilia GEMOK

Hersilia GEMOK

Female 7mm with Tails. 4.5 mm Net Body length

9-8-2009  BUKIT GEMOK

 

Hersilia GERGASSI  |  Hersilia GEMOK  |


Hersilia GEMOK

Hersilia GEMOK

Female

9-8-2009 Bukit Gemok

This Hersilia spider (Long-spinnered Bark Spiders) is a genus of tree trunk spiders in the Hersiliidae family. Sometimes known as Two-tailed spiders, due to the 2  greatly enlarged spinnerets.

Males grow up to 8 mm long, and females up to 10 mm. Hersilia spiders can be found on tree trunks in gardens or jungle fringes in Africa, Asia and Australasia.

This female is 7mm including the length of the 2 spinnerets. Excluding the 2 spinnerets the nett body length is only 4.5mm.  Found on a tall tree trunk in Sabah, Malaysia.


Species in Borneo :
The revisions by Baehr & Baehr and Rheims & Brescovit revealed that there are only 6 species in Borneo Island.

1) Hersilia impressifrons Baehr & Baehr, 1993 (Borneo)
2) Hersilia jajat Rheims & Brescovit, 2004 (Borneo)
3) Hersilia kerekot Rheims & Brescovit, 2004 (Borneo)
4) Hersilia kinabaluensis Baehr & Baehr, 1993 (Borneo)
5) Hersilia lelabah Rheims & Brescovit, 2004 (Borneo)
6) Hersilia sumatrana (Thorell, 1890) (India, Malaysia, Sumatra, Borneo)


The Hersiliidae is a small family of flat, highly cryptic, medium-sized spiders, which mostly live on tree trunks or rocky crags. They can easily be recognized by the flattened body, raised eye region, the extremely long posterior spinnerets, and the long legs stretched out radically on tree bark or lichen-covered crags.

The Hersiliidae, commonly called long-spin or two tailed spiders, is a smaller family comprising 7 genera and 148 species worldwide of which 66 species of 4 genera are known from the Oriental Region (Baehr and Baehr 1993, Platnick 2005).

The genus Hersilia, comprised of about 58 species worldwide, occurs mainly in the Ethiopian, Oriental, and Australian Regions.

Genus Promurricia containing only 1 species, P. depressa Baehr et Baehr, 1993, is endemic to Sri Lanka (Ceylon);

Genus Murricia containing about 3 species occurs in India, Sri Lanka, and Singapore; and

Genus Neotama containing 4 species occurs in India, Sri Lanka, and Indonesia (Sumatra and Java) (Baehr and Baehr 1993, Platnick 1997 2005).

Hersilia is usually found in trees. The Hersiliidae is a family of spiders noted for their elongated posterior lateral spinnerets which can be as long as the abdomen in long-spinnered bark spiders and less in rock living species.

 
Hersilia is a diurnal, arboreal genus which can sometimes be found on nearby rocks. They do not spin webs or construct retreats and can often be spotted only by the reflection of the sun on their dragline silk threads. They capture  prey by swaying their long spinnerets over the victim and encircling it wrapping more silk over it. The prey is then bitten and consumed on the spot. The egg sac is wrapped in silk with bits of bark debris attached to aid camouflage.
 


 
Hersiliids are small to medium (4.5-12.5mm body length) dorso-ventrally flattened spiders.

Long legs stretched out radically on tree bark or lichen-covered crags.

They are quick and difficult to capture as they disappear into the narrowest of crevices.

Left : This Hersiliids female spider body is 7mm including the length of the 2 spinnerets.

If excluding the 2 spinnerets the net body length is only 4.5mm.


 
View from front: the 8 eyes situated in two recurved rows, on a raised hump (tubercle).

 
View from above: the carapace is oval with the 8 eyes situated in two recurved rows, on a raised hump (tubercle).

The anterior median eyes are largest.

 


 

Distinctive elongate lateral spinnerets, which are used in prey capture by swaying them over the victim thus wrapping the victim in silk.

The oval abdomen is wider posteriorly with the posterior lateral spinnerets extending out parallel to each other. The inner edge of these spinnerets is lined with silk-producing tubules (spine-like spigots)

They are cryptically coloured in variegated shades of cream, orange, green, brown, grey and black, features they share with the family Selenopidae.


 
Hersiliids are small to medium (4.5-12.5mm body length) dorso-ventrally flattened spiders.

Long legs stretched out radically on tree bark or lichen-covered crags.

They are quick and difficult to capture as they disappear into the narrowest of crevices.

Left : This Hersiliids female spider is 7mm including the length of the 2 spinnerets.

If excluding the 2 spinnerets the net body length is only 4.5mm.


 
 
 

 

SPIDERS OF BORNEO

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