. Bulletin of the British Museum (Natural History) Geology Supplement. 4o ELOPIFORM FISHES n pu1 nsppu2 eP1-3 un3 pu5. 5 mm i 1 i Fig. 17. Anaethalion vidali (Sauvage). Caudal skeleton in left lateral view. Camera lucida drawing of , partially restored. Arrows indicate upper and lower principal fin-rays. There is also variation in the length of the second preural neural spine, long in A. angustus, ' three-quarter length ' in A. (?) cf. subovatus and ' half-length ' in A. angustissimus, A. knorri, A. gigas and A. sp. The three epurals of most species of Anaethalion form a g
. Bulletin of the British Museum (Natural History) Geology Supplement. 4o ELOPIFORM FISHES n pu1 nsppu2 eP1-3 un3 pu5. 5 mm i 1 i Fig. 17. Anaethalion vidali (Sauvage). Caudal skeleton in left lateral view. Camera lucida drawing of , partially restored. Arrows indicate upper and lower principal fin-rays. There is also variation in the length of the second preural neural spine, long in A. angustus, ' three-quarter length ' in A. (?) cf. subovatus and ' half-length ' in A. angustissimus, A. knorri, A. gigas and A. sp. The three epurals of most species of Anaethalion form a graded series but those of A. angustissimus are subequal in length, as in many primitive euteleostean fish. It is also to be noted that A. gigas from the Kimmeridgian of Spain shows a large neural structure above the first preural and first ural centra. This appears to be a result of fusion between two neural arches which in other species remain separate. Such a fused structure may be a function of size. Regrettably, too few specimens were examined to allow an assessment of these variations. The neural arches and spines are known to vary in Megalops (Text-fig. 33) and perhaps little attention is justified. The development of laminar bone in some species may be of significance since this feature is usually associated with the euteleostean caudal skeleton (Patterson 1970b).. 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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