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Coenobita perlatus

中文/日本語

Click different parts of the land hermit crab

Scientific name: Coenobita perlatus
Chinese name: 橙紅陸寄居蟹 /  珍珠陸寄居蟹 /  草苺陸寄居蟹
English name: Strawberry Land Hermit Crab
Japanese name: サキシマオカヤドカリ
Max length of front part (head) of  cephalothorax: 18mm
Distribution(Map):

India ~ Pacific Ocean, Madagascar, Japan, North America, Australia, Red Sea.

Habitat:

Live near coast , beach, cay area, like climbing. They like to find food in the intertidal zone at night. They usually move in a group.

Chirping: Can make sound
Favorite Shell: Turbo shell, Tonna Shell
*Remark

In Japan, they are in danger species and belong to a natural monument. In Australia, export is prohibited.

The following species information  is for reference only

 Body Colour / Spot
 

Body colour generally in Orange, Orange-red or Red.

橙色個體 橙紅色個體
火紅色個體

White granule / spot on whole body.

 

 

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 Eyes / Eyestalks
Eyes are elongated in shape. Eyestalks are same colour with body or sallowish.
 

 


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 Antenna
 
1st and 2nd pair of antenna are orange in colour (White circle). Antennal acicle cannot move, fused with second segment of its peduncle.
 

 


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 Claws / Walking Legs
 

Left claw is a little bit larger than right claw and both 2 claws have many spots. There are 4~7 ridge (////) on the upper part of the big claw (White circle). There are some hair on the inside part of 2 claws.

 

Shape of big claw has a little bit different among different species

 


Walking legs are strong for climbing. The last 2 parts (dactylus & propodus) of their 3rd left walking leg (White circle) are very strong.
 

According to the articles of Akira Asakura (Japan Natural History Museum and Institute, Chiba) and Yukio Nakasone (University of the Ryukyus), outer surface of propodus of left 3rd leg not separated from dorsal surface by a well-marked longitudinal crest.

 DRAW by TONY

 


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 Abdomen
 

Abdomen is quite short and fat (Red circle).

 

 


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 Juvenile
 

According to the information that posted before, juvenile tend to white/light pink in colour. Orange / red colour will become much more when they grow. According to the photos form Database of Crustacea (Decapoda, Stomatopoda), the below photos are considered to be the juvenile of C. perlatus.

shield length 6.4mm
shield length 11.2cm

 

According to the information from a Taiwan friend, juvenile of C. perlatus is not white in colour, about 90% of juvenile is in orange / red colour (just like adult crabs), 10% of juvenile have some white band on the legs and claws (upper part is orange / red , lower part is white). This description seems do not match that photos from Database of Crustacea (Decapoda, Stomatopoda)

And when we look at the belows photo, we can find that even the juvenile is very small in size, their body colour is same as adult one.

 

Is the juvenile of C. perlatus really change from white to orange / red colour or they are originally in orange / red colour as adult? Or in fact the photos from Database of Crustacea (Decapoda, Stomatopoda) in fact is the species of C. pseudorugosus? There is no more information until now.

After discuss with the members of Hermit Crab Association, we think that there may be 2 difficult growing process, this depends on different location which they live and what they eat.

 

growing process 1

 

growing process 2 (click the photo to see bigger photo, scale about 1:1)

 


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 Male sexual tube
 

The shape of male sexual tube as below.

 


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C. cavipes C. brevimanus C. perlatus
C. rugosus C. purpureus C. violascens
C. clypeatus C. variabilis C. compressus
C. spinosus C. scaevola C. olivieri
C. carnescens C. pseudorugosus C. rubescens
C. longitarsis Birgus latro

 

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