. Bulletin of the British Museum (Natural History). Zoology . CLUPEOID FISHES OF THE GUIANAS 79. Fig. 25. Odontognathus compressus Meek & Hildebrand. From Hildebrand 1964. triangular fontanelles (2-5 mm long at 132-6 mm or one-third eye diameter ; quarter eye diameter at 81-4 mm ). Temporal foramen exposed, kidney-shaped, one-third pupil diameter. Swimbladder without postcoelomic prolongations. Posterior border of gill opening evenly rounded, without cleithral lobe. Isthmus devoid of scutes, not quite reaching posterior border of branchiostegal membrane. Gillrakers sl
. Bulletin of the British Museum (Natural History). Zoology . CLUPEOID FISHES OF THE GUIANAS 79. Fig. 25. Odontognathus compressus Meek & Hildebrand. From Hildebrand 1964. triangular fontanelles (2-5 mm long at 132-6 mm or one-third eye diameter ; quarter eye diameter at 81-4 mm ). Temporal foramen exposed, kidney-shaped, one-third pupil diameter. Swimbladder without postcoelomic prolongations. Posterior border of gill opening evenly rounded, without cleithral lobe. Isthmus devoid of scutes, not quite reaching posterior border of branchiostegal membrane. Gillrakers slender, almost straight, half eye diameter and twice length of correspond- ing gill filaments ; filaments of the two hemibranchs about equal. Two or three short gillrakers on posterior faces of both the 2nd and 3rd epibranchials. Pseudo- branch present, exposed, about half eye diameter, with a dozen filaments. Dorsal fin origin far back on body, about twice as close to caudal base as to snout tip and on vertical from 18th to 20th branched anal ray, the finrays slender, broken distally in all. Pectoral fin tips failing to reach anal fin base by 1-1-5 eve diameters (closest in juvenile) ; short axillary scale present, 3-0-3-5 times in length of fin. Pelvic fins entirely absent. Anal fin origin nearer to snout tip than to caudal base by one eye diameter (juvenile), equidistant (middle specimens) or nearer to caudal base by three-quarters eye diameter (largest specimen). Caudal fin damaged but evidently weakly forked in life. Scales : oval, up to 1-5 times as deep as broad in some, apparently very easily shed since few remain. Unexposed portion of scale with a single continuous vertical striation preceded by up to six faint radial striae not reaching centre of scale ; ex- posed portion of scale with slightly eroded posterior border and a few faint, short radiating striae. Caudal possibly not scaled. Colour : uniform light brown with a narrow silver midlateral line, half eye dia- met
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