Figure. Ventral view of Gonatus berryi, 240 mm ML, fresh. Photograph by T. Kubodera.
- Arms
- Arm formula: II=III=IV>I; arms II-IV 60-70% of GL, arms I 50-60% of GL.
- Armature in four series: arms I-III with 2 medial series of hooks (replaced by suckers at arm tips) and 2 marginal series of suckers; arm IV with suckers only.
- Average number of hooks and suckers on proximal half of each arm I-III = 25 at 50 mm GL, 33 at 119 mm GL.
- All arm suckers with similar dentition: Ca. 10-14 pointed teeth distally grading to smooth region proximally.
- Suckers of medial series of arms IV largest (1.5x largest arm III suckers), followed by marginal suckers of arms IV, then the marginal suckers of arms III. Click on an image to view larger version & data in a new window
Figure. Side and oral views of arm armature of G. berryi, 119 mm GL, plesiotype. Left - Large hook and inner ring of a large marginal sucker of arm III. Right - Inner ring of large medial series sucker (left) and of large marginal sucker (right) of arm IV. Drawings from Young (1972).
- Tentacles
- Primary locking-apparatus with 5-6 thick ridges, each with medial sucker and alternating knobs.
- Largest suckers of ventral-marginal series with 8-9 teeth on distal half of inner ring; these suckers distinctly larger than largest arm suckers (median Arm IV).
- Dorsal margin of tentacular stalk with series of alternating suckers and pads along most of stalk length; distal few suckers each with only trace of thick ridges.
- Ventral margin of tentacular stalk with single series of suckers along distal half of stalk. Number of suckers in ventral series ca. 38-58% of those in dorsal series.
Click on an image to view larger version & data in a new window
Figure. Side and oral views of club armature of G. berryi 119 mm ML, plesiotype. A - Inner ring of largest sucker of ventral marginal zone. B - Inner ring of sucker from the middle of the dactylus, ventral series. C - Inner ring of a sucker taken one-fifth of the tentacle length from the base of the club. D - Central hook. E - Distal hook. F - First proximal hook. Drawings from Young (1972).
- Measurements and counts
Character/Station no. 8117 8117 7394 7394 7394 7343 Sex - - - - - Male Gladius length
49 52 42 56 34 119 Mantle width
17 16 13 14 10 35 Fin Length 24 24 18 28 14 65 Fin width 38 34 29 35 24 72 Arm length, I
29 31 22 33 19 65 Arm Length, II 35 37 26 37 22 73 Arm Length, III 34 37 27 37 23 77 Arm Length, IV
32 34 26 36 20 76 1/2 Arm I, sucker count*
25 25 23 28 23 33 1/2 Arm II, sucker count* 25 25 24 28 21 34 1/2 Arm III, sucker count* 25 25 22 29 22 34 1/2 Arm IV, sucker count* 38 40 35 41 33 45 Tentacle length 43 57 38 55 30 85 Club length 17 19 13 20 11 30 Club sucker count
173 165 166 162 163 168 Stalk sucker count (SSC), dorsal series 86 71 77 74 76 83 SSC, ventral series
32 25 41 26 31 36 SSC, medial region 1 0 0 0 0 1
