Notum
The notum (plural nota) is the
segment, or the dorsal surface of the body of nudibranch gastropods. The word "notum" is always applied to dorsal structures; in other words structures that are part of the back of an animal, as opposed to being part of the animal's ventral surface, or underside.This word is used in
nudibranchs
.
In insects
In
dorsal portion of an insect's thoracic segment. The pterothoracic nota (comprising the meso- and metathoracic segments) have two main divisions - the anterior wing-bearing alinotum and the posterior phragma-bearing postnotom.[1] The phragma, or endotergite, is a transverse infolding of the intersegmental sclerite, and its main function is to provide a reinforcing basis of attachment for the dorsal longitudinal muscles. Accordingly, phragmata tend to be best developed in actively flying insect species.[2]
In most winged insects, the structure of each successive notum is quite variable; in the
Membracidae, order Hemiptera
).
The notum on the first thoracic segment is called the
metanotum
.
In nudibranch gastropods
See also
References
- ^ Cranston, P. S, and P. J Gullan. The Insects: An Outline Of Entomology. 5th ed. Chichester: Wiley-Blackwell, 2014. Print.
- ISBN 0-412-61390-5.
- ISBN 0-930118-13-8
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