From ZooTerms (Dictionary of Invertebrate Zoology)
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suture (noun; Latin sutura, seam): 1. Line of junction of 2 parts generally immovably connected.

2. (Arthropoda: Crustacea) In Cirripedia, a line or seam at the juncture of two compartmental plates; weakly calcified areas of the integument for separation at ecdysis.

3. (Arthropoda: Insecta) Grooves marking the line of fusion of two former plates; a narrow membranous area between sclerites; line of juncture of elytra in Coleoptera.

4. (Mollusca: Gastropoda) The continuous spiral line on the shell surface where whorls adjoin.