Achaeus spinosus

Achaeus spinosus

''Achaeus spinosus'' is a small decapod which belongs to the large family of the Inachidae or the spider crabs.
Decorator Crab - Achaeus spinosus Nudi Falls, Lembeh. This one is covered in yellow hydroids. I still need to find which species.
https://www.jungledragon.com/image/76470/decorator_crab_-_achaeus_spinosus.html Achaeus spinosus,Geotagged,Indonesia,Spring

Appearance

The ''Achaeus spinosus'' carapace has an oval shape and does not exceed 4 centimetres or 1.6 inches in length. This crab possesses long fine clawless legs, except the front pair which is smaller and bears chelae . The pedunculate eyes are red. The whole whitish body is thickly covered with fine hairs which help to fix some pieces of sponge or fixed hydroids for camouflage.
Achaeus spinosus dressed in polyps/hydroids Air Bajo, Lembeh.
Another view with the polyps ready to catch particles Achaeus spinosus,Geotagged,Indonesia,Spring

Distribution

''Achaeus spinosus'' can be observed in the tropical waters of the Indo-west Pacific area, including the Red Sea. ''Achaeus spinosus'' usually lives in association with some species of soft coral or sponge.

''Achaeus spinosus'' feeds on plankton and suspended particles which it catches by climbing on the host with whom it's in association to expose itself to the current. ''Achaeus spinosus'' is often observed on its living support. This crab is active at night.
Achaeus spinosus dressed in polyps/hydroids Air Bajo I, Lembeh.
These crabs dress on different types of hydroids and polyps that help them fish prey and camouflage!
See this article for more info:
https://www.theguardian.com/science/blog/2018/jan/30/gone-fishin-decorator-crabs-use-other-species-as-fishing-rods-study-reveals Achaeus spinosus,Geotagged,Indonesia,Spring

Habitat

''Achaeus spinosus'' can be observed in the tropical waters of the Indo-west Pacific area, including the Red Sea. ''Achaeus spinosus'' usually lives in association with some species of soft coral or sponge.

''Achaeus spinosus'' feeds on plankton and suspended particles which it catches by climbing on the host with whom it's in association to expose itself to the current. ''Achaeus spinosus'' is often observed on its living support. This crab is active at night.

References:

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Taxonomy
KingdomAnimalia
DivisionArthropoda
ClassMalacostraca
OrderDecapoda
FamilyInachidae
GenusAchaeus
SpeciesA. spinosus
Photographed in
Indonesia