pupal trachea [FBbt_00002956]

Tracheae of the pupa. The basic framework (primary trachea) develop using the larval trachea of tracheal metameres 1-5 as a template (Whitten, 1957). But the new branches that develop from this basic framework are limited to the pupal and pharate adult stages have a distinct morphology. New pupal branches appear as many grape-like clusters of tracheoles lying free in the body cavity. Each cluster contains many fine tracheoles, with as many as 100 arising from a single point. Each tracheolar initially cell has a tightly coiled, snail-like tracheolar lumen that uncoils during the pupal period, extending towards and attaching to the developing pharate adult tissues. The embryonic/larval dorsal branches posterior to tracheal metamere 5 collapse and are non-functional in the pupa - although may be maintained in a non-functional state as a template for growth of the adult system (Manning and Krasnow, 1993).
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Open pupal trachea in VFB

VFB Term Json

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            "Tracheae of the pupa. The basic framework (primary trachea) develop using the larval trachea of tracheal metameres 1-5 as a template (Whitten, 1957). But the new branches that develop from this basic framework are limited to the pupal and pharate adult stages have a distinct morphology. New pupal branches appear as many grape-like clusters of tracheoles lying free in the body cavity. Each cluster contains many fine tracheoles, with as many as 100 arising from a single point. Each tracheolar initially cell has a tightly coiled, snail-like tracheolar lumen that uncoils during the pupal period, extending towards and attaching to the developing pharate adult tissues."
        ],
        "comment": [
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