. Cephalopoda. Cephalopoda. behind in the development of some parts. I therefore assume that the two larvae belong to Ancistroteuthis and O ny c h ot eu t h i s, but I cannot decide to which genus, not even with the help of older FIGURE 147. A young larva of Onychoteuthidae (Ancistro- teuthis or Onychoteuthis) from the deep plankton of Naples. 10 X'. Slightly reconstructed. The anterior part of the body of the live animal does not project so strongly from the mantle sac; it is shown here as in the specimen to show the parts of the funnel apparatus and mantle cavity. The anterior pa
. Cephalopoda. Cephalopoda. behind in the development of some parts. I therefore assume that the two larvae belong to Ancistroteuthis and O ny c h ot eu t h i s, but I cannot decide to which genus, not even with the help of older FIGURE 147. A young larva of Onychoteuthidae (Ancistro- teuthis or Onychoteuthis) from the deep plankton of Naples. 10 X'. Slightly reconstructed. The anterior part of the body of the live animal does not project so strongly from the mantle sac; it is shown here as in the specimen to show the parts of the funnel apparatus and mantle cavity. The anterior part of the body is retracted into the mantle. Note the develop- ment of the arms, which have slightly progressed. The head shows the typical characters of very young Teuthoidea (cf. Figure 88). Also the funnel apparatus, which has an oblong rectangular neck bond but still no funnel bonds. Most charac- teristic are the form of the posterior end and the attachment of the fins. The typical habitus of such larvae is shown better in Figure 148 than in Figure 147, except for the posterior end, which is also deformed, although it can be reconstructed after Figure 149. The ventral part of the mantle is retracted from the attachment at the margin of the cone, and the posterior end of the gladius is strongly curved ventrally. It is almost impossible to avoid such a deformation during preservation (cf. concluding Section 3). The posterior end resembles otherwise that of the preceding stage. The fins are slightly larger. The typical corners are distinct at the anterior 307 margin of the mantle. The funnel is large, projecting and slightly sac- shaped. In the live animal, the funnel is even longer and its opening projects to before the head (cf. Figure 111). The arms resemble those of the preceding stage (Figure 147), but the apex of the tentacle shows hardly a transition to a quadriserial arrangement and the connection between the third and fourth arms is still not recognizable. Figure 149
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectcephalopoda
