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Glossary of biological terms: T

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tagma (plural: tagmata) (zoology). Applies to the arthropods where the segments of the body are grouped into different functional units (regions of specialisation) called tagmata. In the insects there are three tagmata: head, thorax and abdomen. In the Cheliceriformes (which includes the arachnids) there are two tagmata: prosoma and opisthosoma. Regional specialisation of the arthropod body is termed tagmosis

tepal (botany). Like a petal but applies to flowers where the calyx and corolla (together termed the perianth) are combined into one unit. See perianth for illustration.


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