. Cephalopoda. Cephalopoda. the area behind the gills is much longer, as are the superficial vessels in this area (posterior aorta and posterior pallial veins). The posterior aorta branches in the form typical for the Oegopsida. The median pallial septum is restricted to the posterior part of the mantle cavity and the median pallial artery begins, accordingly also far posteriorly, but there is still a common trunk of the two posterior pallial arteries, which supply the fins (in contrast to the Enoploteuthidae, p. 2 64).. FIGURE 148. Young stage ofOnychoteuthis (orAncistroteu- this) from the de
. Cephalopoda. Cephalopoda. the area behind the gills is much longer, as are the superficial vessels in this area (posterior aorta and posterior pallial veins). The posterior aorta branches in the form typical for the Oegopsida. The median pallial septum is restricted to the posterior part of the mantle cavity and the median pallial artery begins, accordingly also far posteriorly, but there is still a common trunk of the two posterior pallial arteries, which supply the fins (in contrast to the Enoploteuthidae, p. 2 64).. FIGURE 148. Young stage ofOnychoteuthis (orAncistroteu- this) from the deep plankton of Naples. 8x. The posterior end Is deformed but can be reconstructed after Figure 149 as follows: the posterior part of the gladius should be more extended and the ventral median line of the mantle should pass in the continuation of the cone (dotted in b). The spine would then be directed obliquely upward and posteriorly. The general habitus resembles that of the live animal, in contrast to the preceding figure. Head and arms resemble those in Figure 147. The funnel is very large and extended but smaller than in the live animal. The small central drawing is an optical median section through the posterior end of the gladius of a younger larva. The rostrum is still attached terminally on the apex of the cone. The fins of this stage extend almost to the apex of the rostrum which is situated between them as a transition toward the next stage. The stage shown in Figure 150 is further developed. The gladius is more completely surrounded; the keel of the rhachis is visible at some points through the skin. Also visible is the lanceola, a narrow area between the fins, which tapers rapidly anteriorly and more gradually posteriorly. The fins have a posterior point which passes in a curve toward the rounded lateral margin. The fins have grown markedly anteriorly and occupy one fifth of the length of the mantle. The eyes are much larger and laterally displaced so that their rou
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectcephalopoda
