. Cephalopoda. Cephalopoda. form. The arms of the third pair are the longest, and the first arms remain the shortest. The typical swimming margins develop. Particularly important is the development of the tentacles. The stalk becomes very long, slightly flattened dorsoventrally, sometimes with edges bordering the inner and outer side; a narrow margin develops along the outer side. (311). FIGURE 152. Right clubs of older stages of Onycho- teuthis banksi. a-48x; b - 45x; c-40x. The specimens had a dorsal mantle length of 11,13 and 15 mm. Note: 1) loss of the biserial stalked suckers (St) ()
. Cephalopoda. Cephalopoda. form. The arms of the third pair are the longest, and the first arms remain the shortest. The typical swimming margins develop. Particularly important is the development of the tentacles. The stalk becomes very long, slightly flattened dorsoventrally, sometimes with edges bordering the inner and outer side; a narrow margin develops along the outer side. (311). FIGURE 152. Right clubs of older stages of Onycho- teuthis banksi. a-48x; b - 45x; c-40x. The specimens had a dorsal mantle length of 11,13 and 15 mm. Note: 1) loss of the biserial stalked suckers (St) (); 2) development of rows of knobs (Kn) between the rows of suckers on the carpal part (C, Ct); 3) the progressing conversion of suckers into hooks ( Hk) on the hand part; 4) the development of hooks from parts of the sucker, hood of hook (l),apex of hook (2), base of hook (3); 5) growth of the swimming margin (Sm); 6) the addition of further suckers (x) to the originally last suckers on the apex. The typical development of the tentacle club is shown in Figure 152. In younger specimens, slightly older than those described above, there are 4 rows of suckers in the larger distal part of the club and still only 2 rows in the proximal part, of which the first developed and functional suckers are the largest. A swimming margin extends on the dorsal margin of the club, in the distal quarter. Protective margins develop along the whole club in the form of edges. The biserial proximal part corresponds to the "stalk part" of the club and the suckers are later gradually lost, except for a few next to the 4 rows. The first two oblique transverse rows become the carpal part without changing their arrangement; between the rows of suckers develop rows of knobs corresponding to the rows of suckers of the opposite club. The following rows of four form the hand part. The suckers of the ventral middle row are transformed first and correspond to the largest hooks of the club. Their d
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectcephalopoda
