. Bulletin of the British Museum (Natural History). Zoology . CLUPEOID FISHES OF THE GUI AN AS. Fig. 6. Sardinella aurita Valenciennes. From Hildebrand 1964 (as S. anchovia). base by 1-66-2-00 eye diameters ; no single axillary scale but seven triangular scales above upper edge of fin to leave a shallow groove into which the fin can fold. Pelvic fin base about equidistant between pectoral base and anal origin ; axillary scale present, 0-75-0-80 length of fin ; base of pelvics below vertical from 5th or 6th branched dorsal ray. Anal origin about 0-5 eye diameter nearer to caudal ba
. Bulletin of the British Museum (Natural History). Zoology . CLUPEOID FISHES OF THE GUI AN AS. Fig. 6. Sardinella aurita Valenciennes. From Hildebrand 1964 (as S. anchovia). base by 1-66-2-00 eye diameters ; no single axillary scale but seven triangular scales above upper edge of fin to leave a shallow groove into which the fin can fold. Pelvic fin base about equidistant between pectoral base and anal origin ; axillary scale present, 0-75-0-80 length of fin ; base of pelvics below vertical from 5th or 6th branched dorsal ray. Anal origin about 0-5 eye diameter nearer to caudal base than to pelvic base ; base of fin invested in low scaly sheath ; last two branched rays noticeably larger than ante-penultimate ray. Caudal fin with a pair of large alar scales, the upper one underlain by another, smaller scale ; a scattering of small circular scales on rest of fin. Scales : mostly shed ; unexposed portion with one major vertical and four (anterior scales) to six (posterior scales) minor vertical striae, the latter not meeting in the centre of the scale except occasionally in posterior scales ; slightly eroded hind border, slightly produced into a median bulge, with a few short radiating striae at edge. Colour : brown, the upper third of body slightly darker ; fins hyaline except for dark speckling at tips of dorsal rays. Note. These Guyana specimens hardly differ from the lectotypes of 5. aurita and S. anchovia, the only difference being their slightly greater body depth (see above, p. 24) and more posterior anal fin origin (pre-anal distance 76-0-79-9 per cent of , ; cf. 75-4 and 72-3 per cent in 5. aurita and S. anchovia). In gillraker counts, if these increase with size of fish, the Guyana specimens (Figure 5, black triangles, 19 fishes from batches a, b, c, d) do not depart from the general trend given by the types of 5. aurita, S. anchovia and S. mediterranea, although they are slightly higher than Hildebrand's data (stippled squares). However, the
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