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Table 3 Number of specimens (N) and total and mean estimated weight (eW) of each cephalopod species identified from the stomach contents of large pelagic predators caught in the central Mediterranean (SWO = Swordfish; BFT = Bluefin tuna; ALB = Albacore; MSP = Mediterranean spearfish), together mean values of beak size in mm (LRL or LHL)

From: Pelagic cephalopods of the central Mediterranean Sea determined by the analysis of the stomach content of large fish predators

Superorder and order Family Cephalopod species SWO BFT
N LRL/LHL (mm) eW (g) N LRL/LHL (mm) eW (g)
Mean SD Tot Mean SD Mean SD Tot Mean SD
Octopodiformes
Octopoda Octopodidae Eledone cirrhosa 1 2.1 0    0   
Pteroctopus tetracirrhus 3 0.8 0.1 5.2 1.7 0.1 0    0   
Scaeurgus unicirrhus 0    0    0    0   
Argonautidae Argonauta argo 14 2.5 1.2 124.3 8.9 11.9 4 3.8 0.9 86.9 21.7 12.0
Ocythoidae Ocythoe tuberculata 11 2.9 1.9 96.4 8.8 8.2 0    0   
Tremoctopodidae Tremoctopus violaceus 19 2.7 2.2 4,979.8 262.1 901.1 48 2.5 1.3 5,502.0 114.6 348.0
Decapodiformes
Oegopsida Brachioteuthidae Brachioteuthis riisei 6 2.4 0.4 38.8 6.5 2.7 0    0   
Chiroteuthidae Chiroteuthis veranyi 19 2.3 0.8 177.8 9.4 9.2 1 82.3
Cranchiidae Galiteuthis armata 16 2.6 0.9 178.1 11.1 17.4 0    0   
Ancistrocheiridae Ancistrocheirus lesueurii 3 2.6 3.0 515.7 171.9 296.8 1 1.0
Enoploteuthidae Abralia veranyi 4 1.5 0.4 8.7 2.2 1.2 0    0   
Histioteuthidae Histioteuthis bonnellii 13 2.1 0.6 393.9 30.3 21.3 1 247.4
Histioteuthis reversa 19 2.9 0.6 1,041.7 54.8 24.6 3 2.6 0.9 126.4 42.1 35.5
Octopoteuthidae Octopoteuthis cfr sicula 1 935.3 0    0   
Ommastrephidae Illex coindetii 103 3.7 1.2 9,916.1 96.3 62.4 4 2.9 1.4 243.3 60.8 55.6
Ommastrephes bartrami 35 4.1 2.5 5,635.0 161.0 253.0 4 5.1 3.3 976.4 244.1 319,3
Todarodes sagittatus 315 3.8 1.6 43,923.1 139.4 138.0 26 2.3 1.1 988.5 38.0 50.9
Todaropsis eblanae 0    0    2 3.7 273.8 136.9
Onychoteuthidae Ancistroteuthis lichtensteinii 202 2.9 1.1 10,397.5 51.5 57.7 9 2.7 1.4 434.6 48.3 59.4
Onychoteuthis banksii 71 1.4 0.6 885.7 12.5 27.0 17 1.5 0.9 468.0 27.5 45.3
Thysanoteuthidae Thysanoteuthis rhombus 5 5.4 4.1 40,100.8 8,020.2 12,521.8 1 5,091.2
Myopsida Loliginidae Alloteuthis subulata 0    0    0    0   
Sepioidea Sepiolidae Heteroteuthis dispar 172 1.0 0.3 224.9 1.3 3.3 10 0.8 0.2 9.3 0.5 0.4
Total cephalopods per predator 1,032    119,580.8    131    14,531.2   
Superorder and order Family Cephalopod species ALB MSP
N LRL/LHL (mm) eW (g) N LRL/LHL (mm) eW (g)
Mean SD Tot Mean SD   Mean SD Tot Mean SD
Octopodiformes
Octopoda Octopodidae Eledone cirrhosa 1 2.7 0    0   
Pteroctopus tetracirrhus 64 0.6 0.2 99.1 1.6 0.1 0    0   
Scaeurgus unicirrhus 30 0.6 0.1 45.1 1.5 0.1 0    0   
Argonautidae Argonauta argo 18 0.6 0.2 51.7 0.1 0.1 11 2.1 0.9 193.4 17.6 13.0
Ocythoidae Ocythoe tuberculata 7 0.9 0.5 10.3 0.5 0.7 0    0   
Tremoctopodidae Tremoctopus violaceus 0    0    14 2.0 1.0 710.8 50.8 71.9
Decapodiformes
Oegopsida Brachioteuthidae Brachioteuthis riisei 0    0    0    0   
Chiroteuthidae Chiroteuthis veranyi 0    0    0    0   
Cranchiidae Galiteuthis armata 0    0    0    0   
Ancistrocheiridae Ancistrocheirus lesueurii 8 0.7 0.3 9.4 0.4 0.6 4 4.4 1.8 967.5 241.9 243.6
Enoploteuthidae Abralia veranyi 0    0    0    0   
Histioteuthidae Histioteuthis bonnellii 0    0    7 1.7 0.8 156.1 22.3 21.9
Histioteuthis reversa 1 142.6 4 2.8 0.6 192.6 48.1 21.3
Octopoteuthidae Octopoteuthis cfr sicula 0    0    0    0   
Ommastrephidae Illex coindetii 32 1.1 0.8 364.5 11.4 24.1 13 2.7 1.6 735.8 56.6 55.0
Ommastrephes bartrami 0    0    0    0   
Todarodes sagittatus 221 1.2 0.5 1,086.4 4.9 6.9 3 2.3 1.2 100.2 33.4 27.7
Todaropsis eblanae 0    0    0    0   
Onychoteuthidae Ancistroteuthis lichtensteini 91 1.2 0.6 502.9 5.5 18.5 0    0   
Onychoteuthis banksii 181 1.1 0.5 1,101.3 6.1 12.8 1 132.1
Thysanoteuthidae Thysanoteuthis rhombus 0    0    0    0   
Myopsida Loliginidae Alloteuthis subulata 2 0.8 7.7 3.9 0    0   
Sepioidea Sepiolidae Heteroteuthis dispar 1,220 0.9 0.2 1,083.6 0.7 0.5 0    0   
  Total cephalopods per predator 1,876 4,507.3 57 3,188.4