. Cephalopoda. Cephalopoda. than two thirds of the second pair, which was already much longer than the first in the preceding stage. The formula at this stage is 2, 1, 3,4. A swimming margin appears on the distal part of the second pair but this is not visible on the third and first pair. The tentacles are very delicate. The club bears 2 basal and 4 distal rows of suckers. The buccal funnel is weak but distinctly developed, consisting of 7 FIGURE 149. Young stage of Onychoteu this b a n ks i or A n c i s t r o t e u t hi s lichtensteini, after removal of the ventral part of the muscula
. Cephalopoda. Cephalopoda. than two thirds of the second pair, which was already much longer than the first in the preceding stage. The formula at this stage is 2, 1, 3,4. A swimming margin appears on the distal part of the second pair but this is not visible on the third and first pair. The tentacles are very delicate. The club bears 2 basal and 4 distal rows of suckers. The buccal funnel is weak but distinctly developed, consisting of 7 FIGURE 149. Young stage of Onychoteu this b a n ks i or A n c i s t r o t e u t hi s lichtensteini, after removal of the ventral part of the muscular mantle. 8x. Note the beginning differentiation of the third pair of arms (A3); the beginning of the typical connection between the fourth and third pair of arms; the developed funnel bonds (Th); form of the funnel retractors (Tr); degree of development of the gills; course of posterior aorta, lateral pallial vein (VI) and posterior pallial vein (Vp). Note also the gill ligaments,branchial spleen (light,translucent) (Km),afferent and efferent branchial vessels, branchial hearts (Kg) .venous appendages (Vs), renal papillae (Ni), origin of the posterior aorta (Ao),hind intestine, anal papilla, ink sac (Tb),vena cava (Vc),base of tentacles (Te), fourth pair of arms (A4),gill band (Kb). Re - origin of cephalopodial retractor in the shell sac; x - probable margin of shell sac (cf. Figure 64 on p. 152); Ms — septum of mantle; Ap — posterior pallial artery; Co — cone; Rs — rostrum. 309 This stage has a dorsal length of the mantle of mm and the fins are mm long. There are several specimens with a similar habitus, the largest with a mantle length of min and a fin length of mm, all of them of uncertain systematic position. If the mantle is 11 mm long, Ancistroteuthis lichtensteini can be distinguished from Onycho- teuthis banks i. In Onychoteuthis b an k s i, for example, the fins are longer than one third of the mantle, in A. lichtensteini they are at first sho
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectcephalopoda
