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	Kingdom Animale | Phylum Arthropoda

Arthropods on the site Subphylum Tracheata Class Collembola Springtails Class Insecta Mangrove Moth Sea Skater Halovelia Subphylum Chelicerata Class Pycnogonida (Pantopoda) Sea Spider Class Arachnida Marine Spider Desis Class Merostomata Subclass Xiphosura Horseshoe Crab Subphylum Crustacea Arthropods Arthropods have segmented limbs and an external skeleton. Nearly all marine ones belong to the subphylum Crustacea. Subphylum Tracheata This subphylum is characterised by the presence of a tracheal system which is used for breathing atmospheric air. Members of the subphylum include those in the Class Colembola and Insecta. Subphylum Chelicerate Members of this subphylum have pincer-like appendages on the head called chelicerae which are mainly used for feeding. They usually breathe by means of special structures called "book-gills". Members of the subphylum include those in the Class Pcynogonida, Arachnida and Merostomata.

Introduction Shore environment

From A Guide to Seashore Life by Dr Leo W H Tan and Peter K L Ng Published by the Singapore Science Centre and sponsored by BP @Raffles Museum of Biodiversity Research and Singapore Science Centre