. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. fia. Dorsal blade low, blade height less than mm for SL 25-50 mm, less than mm for SL 50-70 mm; body narrow (see regression, body depth, Table 11); no spines on scales below subcaudal photophores; dark well-developed pigment spots fonn line along posterior midline (especially in smaller sizes); upper preopercle spine usually ciuved dorsally, never ventrally —. A. .sladeni (p. 56). b. Dorsal blade high, blade height greater tlian mm for SL 25-50 mm, greater than mm for SL greater than 50 mm; body robust
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. fia. Dorsal blade low, blade height less than mm for SL 25-50 mm, less than mm for SL 50-70 mm; body narrow (see regression, body depth, Table 11); no spines on scales below subcaudal photophores; dark well-developed pigment spots fonn line along posterior midline (especially in smaller sizes); upper preopercle spine usually ciuved dorsally, never ventrally —. A. .sladeni (p. 56). b. Dorsal blade high, blade height greater tlian mm for SL 25-50 mm, greater than mm for SL greater than 50 mm; body robust (see regression, body depth, Table 14); spiny scales present below subcaudal photophores (fish greater than 30 mm SL); pigment spots minute along posterior midline; upper preopercle spine usually ciuved ventrally, never dorsally A. hjchnus (p. 63).. a. Argyropelecus affinis Garman Figure 19 Argyropelecus affinis Garman, 1899: 237 (holo- type USNM 44593; tropical North Adantic; not seen); Brauer, 1901: 120; 1906: 103 (fig. larvae); Regan, 1908: 218; Barnard, 1925: 153; Norman, 1930: 301 (fig.); Jespersen, 1934: 15 (fig.); Fowler, 1936: 221; Beebe, 1937: 201; Parr, 1937: 49; Norman, 1939: 19; Nybehn, 1948: 23; Misra, 1952: 367; Smith, 1953: 102; Haig, 1955: 321; Fowler, 1956: 67; Schultz, 1961: 597 (fig.): Bahamonde, 1963: 83; Blache, 1964: 71 (fig.); Schultz, 1964: 241 (fig.); Backus et al., 1965: 142; Bussing, 1965: 185; Bright and Paquegnat, 1969: 27. Argyropelecus pacificus Schultz, 1961: 599 (fig.); 1964: 241; Berry and Perkins, 1965: 625; Lavenberg and Ebeling, 1967: 185. Species distinction. Differs from A. gigas (in addition to key characters) by its nar- rower body depth and trunk (see regres- sion, body depth. Tables 2 and 3); less distinct trunk striations; relatively longer teeth in lower jaw; less well-developed post-temporal spines; smooth dorsal body surface; and less well-developed neuro- cranial crests (frontals, sphcnotics, and parietals). Description. D. 9;
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