Four pairs of thoracic appendages are present. Cypris; Cypridina. It includes spiders, scorpions, ticks and mites. These small arthropods possess dorsoventrally flattened body adapted for ectoparasitic mode of life on fishes. Speleonectes; Lasionectes. Body is divided into head, thorax and abdomen. Arthropods include creatures that live in water, on land and in the air. They have an exoskeleton, which they shed in order to grow. Ex. Appendages also have respiratory function. The names Oondylopoda and Gnathopoda have been subsequently proposed for the They are commonly known as sea spiders that measure 1-10 mm in length. Ex. Classification of Phylum Arthropoda. Ex. Cyclops; Caligus, Monstrilla. CLASSIFICATION OF ARTHROPODA (After Snodgrass, 1938, 1960) Phylum ARTHROPODA Arthropods are bilaterally symmetrical, metamerically segmented animals having chitinous exoskeleton. Cephalothorax is covered with carapace. Arthropods constitute about 80% of all animals. The phylum Arthropoda gets its name from two Greek words that mean "jointed leg." Legs long for crawling on the sea bottom. Arthropoda is classified into five classes on the basis of body divisions, body appendages, habitat, organs of respiration and modes of excretion. Large crustaceans that have 5-segmented head, 8-segmented thorax and 6-segmented abdomen. Classification of Phylum Arthropods: On the basis of body divisions and presence or absence of certain appendages, the phylum arthopoda is divided into seven classes. They are marine scavengers in which abdominal appendages carry gills and telson is long spike-like. The phylum Arthropoda is comprised of the classes Crustacea, Arachnida, Chilopoda, Diplopoda and Insecta. They have upgraded the class Crustacea into subphylum rank and the subclasses under … Found in marine caves in Bahamas. Maxillae are used for anchoring on host. Crustacea is a subphylum of Arthropoda that contains over 50,000 species including lobsters, crayfish, and shrimp. Deirocheilocaris. Moulting is necessary for growth. Trunk is ringed without appendages. They also possessed segmented antennae and a pair of compound eyes. Abdomen is without legs. Orientation, Navigation and Homing in Animals, Crypsis (Deception In Predator-Prey Interaction). They are marine, either sedentary or parasitic. But the classification of Arthropoda followed in the present text is generally based on Vandel (1949), Snodgrass (1960) and Storer (1979). Ex. They are ectoparasites on deep water crustaceans. Apus; Daphnia. There are only 5 surviving species of horse-shoe crabs in the world and hence they are called living fossils. Arthropods include an incredibly diverse group of taxa such as insects, crustaceans, spiders, scorpions, and centipedes. They are marine bottom dwellers having long antennae for food gathering. The classification of Arthropoda of Ruppert and Barnes (1994) as given partly in this textbook (4th ed. Chart” and explain that organisms in the Phylum Arthropda are classified into subgroups called Subphylum, Class, and Order. There are far more species of arthropods than species in all other phyla combined, and the number of undescribed species in the largest assemblage of arthropods, the insects, probably numbers in the tens of millions. The classification of phylum arthropoda are as follows: Crustacea. Ex. Arthropoda: information (1) Arthropoda: pictures (5014) Arthropoda: specimens (116) Arthropoda: sounds (13) Related Taxa Unspecified Chelicerata spiders, mites, scorpions, and relatives The body is covered by a single large carapace. Ex. Arachnida is a class of animals un-der the subphylum Cherlicerata. They possess two pairs of antennae and their body is divisible into cephalothorax and abdomen. There are 6 pairs of abdominal appendages carrying 5 pairs of book gills for respiration. The phylum is sometimes called Arthropoda, but strictly this term denotes a (putative - see Tactopoda) clade that also encompasses the phylum Onychophora. Ex. Class 1 Crustacea (Crusta: shell) Habitat: They are mostly aquatic, few are terrestrial and very few are parasitic. Identification of Insects and their Relatives: Insects are part of the phylum of animals called Arthropoda. There are no antennae in these arthropods. Arthropods belong to phylum Euarthropoda. They are terrestrial as well as aquatic animals.