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S-TYPE VENTRAL ORGANIZATION:
A term so named because of the sigmoidal nature of the
sulcus. The sixth
precingular plate (1i) tends to have a triangular shape, with anteriorly converging lateral margins and a narrow, typically
planate anterior margin. The fourth
apical plate or its
homologue (A) tends to be (but is not always) long and predominantly
ventral, and contacts the
anterior sulcal plate (ai). See also
L-type ventral organization. Refer to Text-Figure 82.
DINOFLAJ (c) 1998