. Bulletin of the British Museum (Natural History). Zoology . . Fig. 8. Scale features in (a) Harengula humeralis and (b) H. jaguana, showing the slight difference in ridge pattern between the two species. the toothplates that overlie the basihyal and basibranchials (Figure yc, d). In the specimens of H. humeralis examined, these two toothplates are quite narrow (about o-i eye diameter). In specimens of H. jaguana the toothplates are much wider (about one-third eye diameter), the posterior plate being constricted a little before its midpoint and bearing lateral projections posteri
. Bulletin of the British Museum (Natural History). Zoology . . Fig. 8. Scale features in (a) Harengula humeralis and (b) H. jaguana, showing the slight difference in ridge pattern between the two species. the toothplates that overlie the basihyal and basibranchials (Figure yc, d). In the specimens of H. humeralis examined, these two toothplates are quite narrow (about o-i eye diameter). In specimens of H. jaguana the toothplates are much wider (about one-third eye diameter), the posterior plate being constricted a little before its midpoint and bearing lateral projections posteriorly. This difference in shape has been confirmed in the specimen designated putative neotype of Clupea humeralis Cuvier (103-0 mm , SU 5041, Whitehead 1967a) by Dr William Eschmeyer (in litt.), in the supposed type of Harengula jaguana Poey (see below), and in Poey's Berlin specimen of Harengula sardina (106-2 mm , ZMB 5967) by Dr Christine Karrer (in litt.). In specimens identified as Harengula clupeola the toothplates resemble those of H. jaguana but are slightly narrower and lack the two lateral projections posteriorly ; they are still very much broader than in H. humeralis, however, but the anterior broadening of the basibranchial plate is not so abrupt. The key given below has been modified from that of Rivas (1964) and is intended for identification of Guianas material. In spite of the painstaking studies of Rivas and Storey, the genus is still in need of revision ; the basibranchial toothplate character should be tested in Caribbean and Gulf Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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