Difference Between Chordates and Non-chordates

Chordates and Non-chordates are primarily differentiated by the presence or absence of an important structure called the notochord at some point in their lifecycle. However, there are many more differences that separate these two groups of organisms. Read on to learn the difference between chordates and non-chordates.

Difference Between Non-chordates and Chordates
Present (at least in one stage in their lifecycle) Absent. Non-chordates do not have a
Cold Blooded/Warm Blooded
Chordates can either be cold-blooded or warm-blooded All non-chordates are cold-blooded
Mode of Respiration
Respiration occurs either through lungs or gills Non-chordates respire through tracheae, gills or body surface
Presence of Haemoglobin
Present Absent. Hemolymph is present, which is analogous to blood in the vertebrates
Germ Layer
Chordates are triploblastic Non-chordates can either be triploblastic, diploblastic, or neither
Chordates are bilaterally symmetric Non-chordates can either be bilateral, radial, bi-radial, or asymmetrical.
True coelomates Can be either true coelomates, acoelomates, pseudocoelomates.
Tail (post-anal)
Usually present Absent
Present in some animals, such as tortoises. Present
Present Absent
Mostly poor Mostly good
Nerve Chord
Dorsal, single, without ganglia Ventral, double, usually bears ganglia
Blood Circulation
Closed Usually open circulation
It is differentiated and opens before the last segment Usually absent. If present, it opens on the last segment
Present, dorsal to pharynx in head Present in some cases, but nowhere as complex as the brain in chordates.
Organ-system Protoplasmic to organ-system
Ventrally placed Absent. Dorsal/ lateral placement if present
Mammals Arthropods

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Frequently Asked Questions on Chordates and Non-chordates

How are chordates different from non-chordates?

Chordates and Non-chordates are primarily differentiated by the presence or absence of an important structure called the notochord.

Are any invertebrates present in chordates?

Some invertebrates are classified as chordates as they have a notochord, though they lack a proper backbone. Invertebrates that are considered chordates are tunicates and lancelets.

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  1. You always show me how we are starting the question which is very important 👌

  2. I need 11th book

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