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You are here:   animal list > Planaxis sulcatus



Planaxis sulcatus (Born, 1778)

Furrowed Clusterwink

Terence Tan (2011)


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Brief Summary

Common Names

Comprehensive Description

Biogeographical Distribution

Physical Description and Morpholgy

Features of a Planaxid Shell


Shell Morphology

External Anatomy

Internal Anatomy


Evolution & Systematics

Fossil History



Local Distribution and Habitats

Micro-habitats and Associations

Life History & Behaviour

Larval Development

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Locomotion and Foraging Behaviour

Predator Avoidance and Escape Behaviour


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Local Distribution and Habitats

Located just north of the Tropic of Capricorn, Heron Island (23°26′31.20″S 151°54′50.40″E) is a small coral cay, belonging to the Capricorn Group on the Southern Great Barrier Reef, Queensland, Australia (Rohde 1981). It is approximately 300 m and 900 m in diameter and is composed of mainly lithified coral sand and beachrock (Rohde 1981).

On Heron Island, P. sulcatus are predominantly found on beachrock formations that extends for the most parts, the southern beaches (Southside) and to a smaller extend on the northern side (North Beach) of the island
(Rohde 1981).  Populations of P. sulcatus are found to occur almost exclusively on the upper parts of the beachrock formation on the Southside of Heron Island, which are exposed during low tides (Rohde 1981). They occur in distinct, isolated clusters, mostly in crevices between adjacent rocks and depressions of beachrock during low water (Rohde 1981).


                                   Local environment on Heron Island  and P. sulcatus habitat. (A) Aerial view of Heron Island.
area highlighted in red (Southbeach), marked the area at which the population survey of
                                   P. sulcatus
was conducted in October 2011. Populations of  P. sulcatus  are   found  to  occur 
exclusively on  the  upper  parts  of the beachrock formation on the Southside of  the
                                   Island (B) Beachrock Environment found along Southbeach. (C)  P. sulcatus  exposed  on the
                                   beachrocks during low tide on Heron Island. (D) Beach Rock formation along Southbeach

 A population density estimate survey was conducted during a field trip to the island on October 2011. Using stratified random sampling techniques and 100 1m X 1m transects, the density of P. sulcatus on the Southside of Heron Island was estimated to occur at approximately 22 individual snails per m2 of beachrock surveyed. Approximately 600 m of beachrock on the Southside of the island was covered during the survey in October 2011.