. Bulletin of the British Museum (Natural History). Zoology . CLUPEOID FISHES OF THE GUIANAS 63. Fig. 16. Pellona harroweri (Fowler). From Hildebrand 1964 (as Ilisha harroweri). times as long as deep, projecting strongly beyond upper jaw ; six to eight backwardly directed conical teeth on either side of symphysis. Fine granular teeth on palatines, ecto- and endo-pterygoids, those on the latter forming a well-defined and slightly raised oval tooth-pad ; granular teeth on tongue but vomer endentulous. Operculum about twice as high as broad, anterior margin vertical, posterior margin
. Bulletin of the British Museum (Natural History). Zoology . CLUPEOID FISHES OF THE GUIANAS 63. Fig. 16. Pellona harroweri (Fowler). From Hildebrand 1964 (as Ilisha harroweri). times as long as deep, projecting strongly beyond upper jaw ; six to eight backwardly directed conical teeth on either side of symphysis. Fine granular teeth on palatines, ecto- and endo-pterygoids, those on the latter forming a well-defined and slightly raised oval tooth-pad ; granular teeth on tongue but vomer endentulous. Operculum about twice as high as broad, anterior margin vertical, posterior margin with a small but well-defined excavation preceded by a ridge leading to bony plate overlying a small cavity (Figure 17), the latter apparently connected to cutaneous canal system. Opercular series as in Figure 17. Dorsal surface of head with two prominent ridges on each side, converging posteriorly ; fronto-parietal region with two additional ridges on either side. Frontals separated in the midline posteriorly to leave a pair of semicircular posterior frontal fontanelles separated by a narrow median extension of the supra-occipital. Posterior border of gill opening fairly evenly rounded but with well-developed cleithral lobe, silver. Isthmus silver, with posterior third bearing scales, scutes and a fleshy lobe on either side ; branchiostegal membrane covering anterior third of isthmus. Gillrakers moderately slender, straight, the longest 1-33 times length of corresponding gill filaments ; filaments of anterior hemibranch slightly shorter than those of posterior hemibranch ; no medio-pharyngobranchial. About six short, stubby gillrakers on posterior face of 3rd epibranchial (two to three comparable rakers on posterior face of 2nd epibranchial - a rare condition in clupeoid fishes). Pseudobranch present, exposed, its length just over half eye diameter, bearing about 20 filaments. Swimbladder without postcoelomic prolongations. Dorsal fin origin from equidistant to three-quarters
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