. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ONTOGENY OF SQUID MANTLE KINEMATICS 159. Figure 4. Nonconsecutive digitized video frames from an escape jet by a 3-week-old specimen of Sepiii- teuthis lessoiiiaiw (25-mm DML). (A) The squid immediately before the start of mantle contraction. The mantle is fully expanded, and the mantle cavity is full of water. The bright region of reflection on the head (arrow) is the plastic washer of the tethering apparatus. (B) The squid just after the start of the escape jet. The anterior edge of the mantle (arrow) has contracted, and t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ONTOGENY OF SQUID MANTLE KINEMATICS 159. Figure 4. Nonconsecutive digitized video frames from an escape jet by a 3-week-old specimen of Sepiii- teuthis lessoiiiaiw (25-mm DML). (A) The squid immediately before the start of mantle contraction. The mantle is fully expanded, and the mantle cavity is full of water. The bright region of reflection on the head (arrow) is the plastic washer of the tethering apparatus. (B) The squid just after the start of the escape jet. The anterior edge of the mantle (arrow) has contracted, and the remainder of the mantle is just beginning to contract. (C) The mantle near its maximum contraction for the escape jet. The head is drawn back into the mantle cavity, and the fins are folded along the body. ID) The end of the exhalant phase and the start of the inhalant phase of the escape- jet. The tins (barely visible on right side) are unfurling and beginning to undulate. The head is maximally withdrawn into the mantle cavity, and the anterior edge of the mantle is starting to flare (arrow) away from the head. squid larger than 40 mm DML (about 5 to 6 weeks post hatching). One video field (about 17 ms) after the start of anterior mantle-edge contraction, two events occurred: (1) the fins were folded against the ventral side of the mantle, and (2) the remainder of the mantle began to contract rapidly, expelling water from the mantle cavity through the funnel (Figs. 4B, C). Nearly simultaneous with folding of the tins, the head was drawn back into the mantle cavity, presumably by the activation of the head retractor muscles. Maximal head retraction was completed within two video fields (about 34 ms) and was maintained until the end of the exhalant phase of the jet (Fig. 4C). At the end of the exhalant phase of the jet, the fins unfolded and began undulating immediately. Concurrent with fin unfolding, the. Please note that these images are extracted from scanned page images t
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
