. Bulletin of the British Museum (Natural History). Zoology . n8 P. J. P. WHITEHEAD. Fig. 43. Anchoa spinifer, detail of head with arrow indicating triangular projection on sub-operculum (from a fish 159-5 mm from batch g of material studied). eye diameter ; eye fully covered by thin layer of adipose tissue. Maxilla with tapering, pointed tip, projecting more than half eye diameter beyond tip of 2nd supra-maxillary and projecting just beyond gill cover and well beyond articulation of lower jaw ; lower edge of maxilla with a single series of slightly curved conical teeth, the
. Bulletin of the British Museum (Natural History). Zoology . n8 P. J. P. WHITEHEAD. Fig. 43. Anchoa spinifer, detail of head with arrow indicating triangular projection on sub-operculum (from a fish 159-5 mm from batch g of material studied). eye diameter ; eye fully covered by thin layer of adipose tissue. Maxilla with tapering, pointed tip, projecting more than half eye diameter beyond tip of 2nd supra-maxillary and projecting just beyond gill cover and well beyond articulation of lower jaw ; lower edge of maxilla with a single series of slightly curved conical teeth, the longest (at midpoint of jaw) up to 0-9 mm in large specimens, tooth length decreasing evenly anteriorly and posteriorly ; pre-maxillae similarly toothed ; 1st (anterior) supra-maxilla plate-like, slender, a little over one eye diameter, 2nd (posterior) supra-maxilla 1-25 eye diameters long, with expanded posterior part (about one-third depth of maxilla), slender and tapering anterior shaft, and a middle section arched to fit closely over the upper edge of the maxilla, to which it is closely bound by tissue. Lower jaw slender, its depth about six times in its length ; edge of jaw with teeth similar in size and shape to those of upper jaw ; vertical from dentary symphysis a little nearer to anterior eye border than to snout tip. A patch of three to seven conical teeth on antero-lateral projections of vomer ; rugose teeth on palatines and ecto- and endo-pterygoids ; fine denticulations along upper edge of anterior half of hyoid arch ; tooth plates covering inner surfaces of first three branchial arches ( Figure 44) and in one alizarin-stained specimen (batch c, 1297 mm ) many small and independent tooth plates are scattered in the mucosa of mouth (toothed areas in all specimens much greater than shown by Nelson 1970 : fig. 4b). Operculum very narrow, about seven to eight times as long as broad, its lower margin at an angle of about 60 degrees to the horizontal; its posteri
Size: 2157px × 1159px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
