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You are here:   animal list > Ocypode cordimanus

 

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Ocypode cordimanus Desmarest, 1825

Smooth-handed ghost crab

Sharon Edgley (2011)


 

 

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Overview

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Comprehensive Description


Distribution


Physical Description

Size


Identification Resources


Ecology

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Biogeographical Distribution


Ecological Sentinel


Life History & Behaviour


Behaviour

Burrowing


Cyclicity


Evolution & Systematics

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Systematics or Phylogenetics


Morphology and Physiology

External Morphology


Internal Anatomy


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Molecular Biology & Genetics

Nucleotide Sequences


Molecular Biology


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Identification Resources

Two species of ghost crab are common to Australia: Ocypode cordimanus Desmarest, 1825 (Smooth-handed ghost crab) and O. ceratophthalmus Pallas, 1772 (Horned ghost crab) (Jones and Morgan 1994).  Three species uncommon to Australia are O. pallidula Jacquinot, 1842-47, O. convexa Quoy and Gaimard, 1824 and O. fabricii H. Milne Edwards, 1837 (Jones 1988). 

Adult O. cordimanus are easily distinguished from O. ceratophthalmus by the absence of ocular stylets (Barrass 1963).  Additionally, O. cordimanus is one of two species (the other being O. sinensis, not found in Australia) that lack a stridulatory organ on the cheliped (Horch 1975). 


Table 1| Adapted from Jones 1988.

Characters used to distinguish adults of Ocypode species found in Australia

 

Carapace
c.l.    c.w.
of largest specimen

Ocular
stylets

Stridulating
ridge

Notches of lower orbital margin

Fingers of small chela

Hairbrushes on pereiopods

 

 

O. ceratophthalmus

 

 

40    45                      

 

Very long and slender

A few round tubercles above, 14-30 striae below

Median

indistinct,

lateral absent

 

 

Acute

♂ triple brushes on II & III

♀ single brush on II

 

 

 

 

O. cordimanus

 

 

 

35      40        

 

 

 

Absent

 

 

 

Absent

Median very slightly, lateral broad key-hole shaped

 

 

 

Acute

 
♂ single brushes on II & III

♀ single brush on II

 

 

 

O. fabricii

 

 

38.5    41    

 

 

Very short

 

Many very fine striae

 

Median slight, lateral U-shaped

 

Rounded and truncate

♂ triple or double brush on II

♀ single brush on II

 

 

O. convexa

 

40.5 47.2      

 

Absent

10-25 rounded tubercles

 Median deep, lateral deep

 

Acute

♂ & ♀ single brush on II and III

 

 

 

 

O. pallidula

 

 

 

21.8 23.8     

 

 

 

Absent

 

 

25-40 evenly spaced fine striae

 

Median weak to absent, lateral absent

 

 

 

Acute

♂ double brush on II and III

♀ single brush on II and III

 

Classification

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