. Bulletin of the British Museum (Natural History). Zoology . 92 P. J. P. WHITEHEAD. Fig. 32. Engraulis eurystole (Swain & Meek). From Hildebrand 1964. 2nd supra-maxilla, entire lower edge with a single series of fine, close-set teeth ; pre- maxillae with very small teeth ; 1st (anterior) supra-maxilla slender, about equal to eye diameter, rounded distally and tapering to point anteriorly, 2nd (posterior) supra-maxilla expanded and rounded posteriorly, as deep as maxilla but leaving a portion of that bone exposed ventrally. Lower jaw slender, with a single series of teeth (fin
. Bulletin of the British Museum (Natural History). Zoology . 92 P. J. P. WHITEHEAD. Fig. 32. Engraulis eurystole (Swain & Meek). From Hildebrand 1964. 2nd supra-maxilla, entire lower edge with a single series of fine, close-set teeth ; pre- maxillae with very small teeth ; 1st (anterior) supra-maxilla slender, about equal to eye diameter, rounded distally and tapering to point anteriorly, 2nd (posterior) supra-maxilla expanded and rounded posteriorly, as deep as maxilla but leaving a portion of that bone exposed ventrally. Lower jaw slender, with a single series of teeth (finer than those of maxilla), continuous along jaw except for a short gap below junction of maxilla and pre-maxilla (Figure 33d) ; dentary symphysis below vertical at midpoint between snout tip and anterior eye border. Fine row of teeth on tongue, three to six minute teeth on posterior lateral projections of vomer, fine teeth in a single V-shaped series on endo-pterygoids, about six small teeth on palatines and a series of small teeth along postero-ventral ridge of ecto-pterygoids. Operculum narrow, 3-5 times as long as broad, its lower border at an angle of about 20 degrees to the horizontal; exposed portion of sub-operculum with evenly rounded posterior margin. Fine cutaneous canals covering opercular series and sub-orbitals. Greatest length of cheek region 1-33 times eye diameter. Dorsal surface of head with two deep supra-orbital canals bridged by an anterior and pos- terior strut, the latter above eye centre. Frontals barely separated in the midline posteriorly, frontal tips square, very small rectangular posterior frontal fontanelles exposed, their width one-sixth eye diameter. Temporal foramen small, about half size of pupil; pterotic bulla large, almost entirely filling pre-epiotic fossa. Posterior border of gill opening fairly evenly rounded, covered by opercular series except for narrow exposed crescent opposite posterior margin of operculum. Isthmus silvery, the sternoh
Size: 3149px × 793px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
