Arms IV (i.e., the ventral arms) are not usually the largest in decapodiforms. In a few families, however, arms IV of most species are not only much longer but generally much thicker, due to the broad lateral membrane, than the other arms.
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Figure. A - Chiroteuthis veranyi, side view, photograph by E. McSweeny. B - Chiroteuthis spoeli, drawing by J. R. Schroeder. C - Mastigoteuthis agassizii, dorsal view, drawing from Verrill, 1881. (A, B - Fam. Chiroteuthidae; C - Fam. Mastigoteuthidae)
Verrill, A.E. 1881. The cephalopods of the north-eastern coast of America. Part II. The smaller cephalopods, including the "squids" and the octopi, with other allied forms. Trans. Connecticut Acad. Sciences, 5: 259-446.
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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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Page: Tree of Life
Cephalopod Arms IV: Size
Richard E. Young, Michael Vecchione, and Katharina M. Mangold (1922-2003).
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