What are the three major subphyla of arthropods?
The phylum Arthropoda is commonly divided into four subphyla of extant forms: Chelicerata (arachnids), Crustacea (crustaceans), Hexapoda (insects and springtails), and Myriapoda (millipedes and centipedes).
How many legs do Uniramians have?
Subphylum Uniramia Insects first evolved 300 million years ago. Their body is divided into three tagmata: head, thorax, abdomen. Insects have 6 legs and usually 1 or 2 pairs of wings.
What are the characteristics of chelicerata?
Common name: chelicerates, arachnids Like all arthropods, they have a segmented body and segmented limbs and a thick chitinous cuticle called an exoskeleton. Chelicerates have two body segments; a cephalothorax and an abdomen. They have no antennae, but have six pairs of appendages.
What are the 4 main characteristics of arthropods?
All arthropods posses an exoskeleton, bi-lateral symmetry, jointed appendages, segmented bodies, and specialized appendages.
What is the subphylum?
Definition of subphylum : a category in biological classification ranking below a phylum and above a class.
What are the 3 main characteristics of arthropods?
Major External Characteristics
- Exoskeleton containing chitin.
- Body bilaterally symmetrical.
- Body segments grouped into specialized regions (= tagmata, plural)
- Jointed appendages.
- These jointed appendages variously specialized for feeding, locomotion, sensing.
Why are insects called Uniramians?
The name Uniramia was temporarily rejected as a polyphyletic group, but when used now refers to the subphylum consisting of the insects + myriapods. Subphylum Uniramia is characterized by uniramous (single-branching) appendages, one pair of antennae and two pairs of mouthparts (single pairs of mandibles and maxillae).
What are the three body regions of Uniramians?
Subphylum Uniramia Insects first evolved 300 million years ago. Their body is divided into three tagmata: head, thorax, abdomen.
What are the classification of Chelicerata?
ChelicerataChelicerata / Scientific name
classification of arthropods Chelicerata belong to the class Arachnida, containing the spiders, scorpions, ticks, and mites. They are largely terrestrial arthropods, living beneath stones and logs, in leaf mold, and in vegetation, but there are some aquatic mites that live in fresh water and in the sea.
What are defining characteristics of arthropods?
All arthropods posses an exoskeleton, bi-lateral symmetry, jointed appendages, segmented bodies, and specialized appendages. The major arthropod classes can be separated by comparing their number of body regions, legs, and antennae.
What is another word for subphylum?
n. taxonomic category, taxonomic group, taxon.