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Bird Dung Spider

Cyrtarachne

Description:

Light brown colour, about 25mm aprox. total large, with a large abdomen with 2 big brown spots. Cyrtarachne is a species of orb-weaving spider which is commonly known as Bird-dropping Spider because this is what they seem, it's also believed to mimicry a snail as a form of protection from predators.

Habitat:

Spotted at Campuhan Ridge Walk, Ubud - Bali. It aslo can be found in India (Kerala), Japan, China, Korea, Taiwan and Myanmar.

Notes:

Spiders of the genus Cyrtarachne are known to feed mainly on moths. Webs of these spiders have several unique characteristics: they are horizontal, have widely spaced spiral thread, the spiral thread has low shear joint (one end of a spiral connected to a radius breaks easily), and the viscid “spanning” threads are coated with a unique glue capable of adhering to moths. Other source about this spider spotted at Bali Island: http://www.baliwildlife.com/photogallery... Classification: Phylum: Arthropoda Class: Arachnida Order: Araneae Family: Araneidae Genus: Cyrtarachne

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21 Comments

JordiPrats
JordiPrats 3 years ago

Just found another source with a spotting of Cyrtarachne spider in Bali:
http://www.baliwildlife.com/photogallery...

DanielePralong
DanielePralong 4 years ago

Thanks Jordi. If not C. inaequalis it is a very similar species. I think that Bali is quite underscribed and undercollected. This document lists no Cyrtarachne species for Bali:
http://www.cacaospiders.com/IndonesianSp...

JordiPrats
JordiPrats 4 years ago

According to WSCA (World Spider Catalog) Cyrtarachne inaequalis distribution is India, China, Korea & Myanmar
http://www.wsc.nmbe.ch/species/3733

JordiPrats
JordiPrats 4 years ago

Thanks Leuba, António, Gilma and Felix.

Leuba Ridgway
Leuba Ridgway 4 years ago

Congratulations on the SOTD - great mimic indeed !

Great capture Jordi,congrats on the SOTD and thanks for sharing

DanielePralong
DanielePralong 4 years ago

Congratulations Jordi, this stunning spider is our Spotting of the Day!

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Felix Fleck
Felix Fleck 4 years ago

Great pictures and info!

JordiPrats
JordiPrats 4 years ago

Ok Daniele, agree will leave by now at genus level, I checked some spider lists for Indonesia but not found.

DanielePralong
DanielePralong 4 years ago

Online images of C. bufo show it being much whiter. Have you found any species listed for Bali? In doubt my suggestion would be to leave it at genus level. I would like to feature it but we don't want to populate the internet with incorrect IDs ;-)

JordiPrats
JordiPrats 4 years ago

Thanks Daniele for the advise, yes I think you are right as C. Inaequalis looks more similar in colour.
Anyway I checked the 'Checklist of spiders from Indonesia and New Guinea' (2011)/ Kathrin Stenchly / Department of Crop Sciences, Agroecology, Georg-August-University Goettingen, Germany as well as web based sources and still cannot find this specimen in Bali.

JordiPrats
JordiPrats 4 years ago

Thanks Albert!

DanielePralong
DanielePralong 4 years ago

Great images Jordi! Are we sure this is C. bufo? There are many species in the genus Cyrtarachne and I found it hard to find information about its distribution to Bali.This seems a better match to C. inaequalis for instance:
http://symbiota4.acis.ufl.edu/scan/porta...
http://www.inaturalist.org/taxa/360439-C...

AlbertKang
AlbertKang 4 years ago

Wow!
That's a great find and nice pictures too :D

JordiPrats
JordiPrats 4 years ago

Thanks Sukanya

SukanyaDatta
SukanyaDatta 4 years ago

Super spotting!

JordiPrats
JordiPrats 4 years ago

Thanks Joseph

Good find Jordi!

JordiPrats
JordiPrats 4 years ago

Thanks NamgyaI

DrNamgyalT.Sherpa
DrNamgyalT.Sherpa 4 years ago

Great spotting JordiPrats!

JordiPrats
Spotted by
JordiPrats

Bali, Indonesia

Spotted on Nov 11, 2016
Submitted on Nov 18, 2016

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