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You are here:   animal list > Lambis lambis

 

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Lambis lambis (Linaeus 1758)

Spider Conch


 Jarrad Oxley (2011)


 

 

Fact Sheet

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Overview

Brief Summary


Distribution


Physical Description

Size


Sexual Dimorphism


Identification Resources


Ecology

Local Distribution and Habitats


Crypsis


Life History & Behaviour

Feeding


Locomotion


Strength During Locomotion (Report)


Righting


Reproduction and Development


Evolution & Systematics

Fossil History


Phylogenetics


Morphology and Physiology

Shell Morphology


Body Morphology


Internal Anatomy


Conservation

Trends


Threats


References & More Information

Acknowledgements


References

Sexual dimorphism

Spider conchs are very sexually dimporphic (Walls 1980). There are a number of characteristics used to distinguish males from females, the most obvious being size; males tend to grow much larger and more robust than females.

The six hollow marginal digitations of the flared outer lip are also used to distinguish genders of this species, as subtle differences occur in their size and shape. In males, the two anteriormost digitations are short and protrude posteriorly from the shell (See Figure 1). Whereas in females, the two anteriormost digitations are long and protrude anteriorly from the shell (See Figure 2). 

   
 
Figure 1: Dorsal view of male spider conch with
anterior end to the bottom.
 
Figure 2: Dorsal view of female spider conch with
anterior end to the bottom.

Apart from shell characteristics, males can be distinguished from females by the presences of a relatively large penis, or verge, on the right dorsal part of the visceral mass. This can be observed when males extend their visceral mass from their shells (See Figure 3).


Figure 3: Male spider conch extended from shell. Note the relatively large penis. 
Figure 4: Female spider conch extended from shell. No penis present.


Images

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(48 objects, created 10/11/2012)

Album: This is a private album that is not visible to anonymous users 2011

Summary:

Date:

12

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Classification

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Kingdom
Animalia
Phylum
Mollusca
Class
Gastropoda
Order
Littorinimorpha
Superfamily
Stromboidea
Family
Strombidae