secondary spicules (PORIF) Microscleres distributed throughout the mesenchyme.
secondary teeth (BRACHIO) In Stropheodontidae, two projections from the ventral process that fit into sockets of the brachial valve.
second axillary (ARTHRO: Insecta) 1. A sclerite articulating partly with the preceding sclerite and partly with the base of the radius; submedia. 2. An articulation sclerite of an insect wing along the first axillary that touches the base of the radial vein anteriorly, with a ventral portion of the sclerite set below the wing surface; intra-alare.
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