An internal ridge having its origin at the base of the pleural apophysis and extending along the posterior margin of the mesocoxal cavity; receiving the attachment of indirect wing muscles.
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith