FB2026_03 , released September 17, 2026
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Term apodeme of rostrum-haustellum joint ID (Ontology) FBbt:00003517 (Fly Anatomy)
Definition Apodeme that facilitates rotation of haustellum relative to the rostrum (McKellar et al., 2020). One (ventroposterior) arm is attached to the external cuticle of the rostrum, continuous with the lacinia (Grimaldi, 1994; McKellar et al., 2020). An anterior arm is continuous with the external cuticle of the haustellum (McKellar et al., 2020). A dorsal arm is free and forms the insertion site for proboscis muscle 4 (McKellar et al., 2020). This muscle is also attached to a rigid part of the rostrum, so that it rotates the apodeme and extends that haustellum as it contracts (McKellar et al., 2020).[ FlyBase:FBrf0007734 FlyBase:FBrf0076448 FlyBase:FBrf0246028 ]
Also Known As"cardio-stipital element of lacinia" ; "maxillary apodeme" ; "Y-shaped apodeme"
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 apodeme of rostrum-haustellum joint (all annotations which use CV term, excluding "NOT" statements)
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gnathal segment
 |__maxillary segment________
mouthpart                    |
 |__proboscis________________|
apodeme                      |
 |__adult apodeme____________|
adult integumentary system   |
 |__adult apodeme____________|
organism subdivision         |
 |__proboscis________________|
ventral ectoderm derivative  |
 |__proboscis________________|
                             apodeme of rostrum-haustellum joint  7 rec.
                              |__anterior arm of apodeme of rostrum-haustellum joint
                              |__dorsal arm of apodeme of rostrum-haustellum joint
                              |__ventroposterior arm of apodeme of rostrum-haustellum joint 4 rec.
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Is a adult apodeme
Part of maxillary segment
proboscis
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