NOTE Hernandez-Garcia: Diet of Xiphias gladius 



41 1 



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Appendix 



Description of the "unknown A" lower beak 



Terms and measurement used to describe the char- 

 acteristic beak (the "Unknown A") are the same as those 

 used by Clarke (1980, 1986a). The beak (Fig. 2 (belongs 

 to an unidentified species of oegopsid, and its general 

 shape is similar to the beak oiDiscoteuthis. It is taller 

 than it is long (Fig. 2A) and although five of them had 

 digested wings, the largest beak (lower rostral 

 length=4.4 mm) had a full wing with an isolated spot. 

 The rostrum is distinctly shorter than deep (gl 

 a-0.67, where g is the hood length in the midline 

 and a is the length of the rostral edge visible in pro- 



file) and narrow (i/j=2.8, where i is the LRL andj is 

 the distance between the jaw angles). There is no 

 hook in the rostral edge, but rather this is sharp- 

 edged and thickened. The crest is short and has a 

 notch in the lateral wall to the side of the crest (Fig. 

 2, A and C). The hood does not lie close to the crest. 

 The surface of the hood has a very soft fold. The jaw 

 angle is obtuse and a sharp anglepoint is present (Fig. 

 2B). Jaw angle is obscured from the side by a very low 

 wing fold (Fig. 2, A, B, and F) which is covered by 

 cartilage (dotted area). A distinct lateral wall ridge 

 forms a fin (Fig. 2, E, I), similar to Histioteuthis beaks 

 (type A) described by Clarke (1980). This runs toward 

 the midpoint of the posterior edge of the lateral wall 

 (Fig. 2, E, III). The beaks ofDiscoteuthis lack this ridge. 



