The outer ring of arms and tentacles is the brachial crown. The inner ring formed by the buccal membrane and buccal supports is the buccal crown. The lateral keel of arm IV is also known as the "tentacular sheath."
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Figure. Oral view of the brachial crown of a loliginid squid. Drawing modified from Naef, 1923 (Cephalopoda. Fauna und Flora des Golfes von Neapel. Monograph, no. 35)
In this illustration, the buccal connectives attach to the dorsal margins of arms I and II and to the ventral margins of arms III and IV (i.e., the formula is DDVV). Buccal suckers occur in only a few decapodiform families. The number of buccal supports varies from six to eight.
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University of Hawaii, Honolulu, HI, USA
National Museum of Natural History, Washington, D. C. , USA
Katharina M. Mangold (1922-2003)
Laboratoire Arago, Banyuls-Sur-Mer, France
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Cephalopod Brachial and Buccal Crowns
Richard E. Young, Michael Vecchione, and Katharina M. Mangold (1922-2003).
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