FB2026_03 , released September 17, 2026
CV Term Report
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Term stomodeal invagination ID (Ontology) FBbt:00005326 (Fly Anatomy)
Definition Infolding of the anteroventral embryo that arises during stage 10 (Campos-Ortega and Hartenstein, 1997). Its formation begins when cells surrounding the stomodeal anlage, which consists of a plate of tall cylindrical cells just prior to invagination, divide synchronously (Campos-Ortega and Hartenstein, 1997). The invaginated cells divide immediately afterwards, forming a monolayered epithelium (Campos-Ortega and Hartenstein, 1997). It is initially oriented perpendicular to the horizontal plane, but progressively bends towards the ventral plane (Campos-Ortega and Hartenstein, 1997). It grows caudally by cell divisions and incorporation of neighboring ectodermal cells (Campos-Ortega and Hartenstein, 1997).[ FlyBase:FBrf0089570 ]
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)EXPRESSION_STAGE_TISSUE_POSITION
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 stomodeal invagination (all annotations which use CV term, excluding "NOT" statements)
     stomodeal invagination | germline clone
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embryo
 |__extended germ band embryo__
anatomical structure           |
 |__multicellular structure____|
                               stomodeal invagination  148 rec.
                                |__early stomodeal invagination 93 rec.
                                |   |__esophagus primordium(+) 19 rec.
                                |   |__proventriculus inclusive primordium 2 rec.
                                |   |__stomatogastric nervous system primordium 68 rec.
                                |__late stomodeal invagination 43 rec.
                                    |__esophagus primordium(+) 19 rec.
                                    |__frontal ganglion primordium 1 rec.
                                    |__proventricular ganglion primordium
                                    |__proventriculus inner layer primordium 22 rec.
                                    |__proventriculus intermediate layer primordium 21 rec.
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Is a multicellular structure
Part of extended germ band embryo
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