FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term mesothoracic metatarsus ID (Ontology) FBbt:00004692 (Fly Anatomy)
Definition First tarsal segment of the mesothoracic leg. Proximally, it articulates with the tibia and distally with the second tarsal segment. Its surface is covered with eight longitudinal rows of bristles, with ventral rows 1 and 8 having thicker and shorter bristles. In contrast to the pro- and metathoracic metatarsi.[ FlyBase:FBrf0012178 FlyBase:FBrf0031004 FlyBase:FBrf0219028 ]
Also Known As"mesothoracic basitarsus" ; "mesothoracic tarsal segment 1" ; "T2 tarsal segment 1" (for all, see Synonyms field below)
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Data ClassFieldDirect annotations
Alleles (FBal)PHENOTYPE_MANIFEST_IN
Insertions (FBti)PHENOTYPE_MANIFEST_IN
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 Alleles Insertions
 mesothoracic metatarsus (all annotations which use CV term, excluding "NOT" statements)
     mesothoracic metatarsus | heat sensitive
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tarsal segment
 |__metatarsus___________________
 |__mesothoracic tarsal segment__|
mesothoracic tarsus              |
 |__mesothoracic tarsal segment__|
                                 mesothoracic metatarsus  18 rec.
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Is a metatarsus
mesothoracic tarsal segment
Develops from presumptive mesothoracic metatarsus
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https://www.ento.csiro.au/biology/drosophila/melanogaster.html?mesobasitarsus