FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term mesothoracic preepisternum ID (Ontology) FBbt:00004598 (Fly Anatomy)
Definition Anterior and major portion of the mesothoracic episternum or katepisternum.[ FlyBase:FBrf0037040 FlyBase:FBrf0068392 FlyBase:FBrf0111704 ]
CommentAccordingly to McAlpine (1981) the term mesothoracic preepisternum is used incorrectly (as by Snodgrass, 1935) and it should be referred to as katepisternum. In addition the mesothoracic katepisternum is frequently, but incorrectly called the sternopleuron (as in Steiner, 1976). Although in Diptera the mesosternum is greatly reduced and internalized, it is not fused with the katepisternum, and thus the latter should not be called sternopleuron. However, it seems that most publications still use the term sternopleuron (or sternopleurite) to refer to the katepisternum or preepisternum - https://orcid.org/0000-0001-5948-3092.
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)PHENOTYPE_MANIFEST_IN
Constructs (FBtp)PHENOTYPE_MANIFEST_IN
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 mesothoracic preepisternum (all annotations which use CV term, excluding "NOT" statements)
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sclerite
 |__preepisternum____________
episternum                   |
 |__preepisternum____________|
 |__mesothoracic episternum__|
mesothoracic pleurum         |
 |__mesothoracic episternum__|
                             mesothoracic preepisternum  116 rec.
                              |__sternopleural bristle 107 rec.
                                  |__anterior sternopleural bristle 15 rec.
                                  |__middle sternopleural bristle 6 rec.
                                  |__posterior sternopleural bristle 7 rec.
                                  |__ventral sternopleural bristle 6 rec.
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Is a preepisternum
Part of mesothoracic episternum
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