. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Marine Hatchetfishes • Baiid 31. Figure 18. Photophore characteristics: genus Sternoptyx. Abbreviations: see p. 6. bladder present (see above for osteological description). Genus ArgyropeJecus Cocco, 1829 Argijropelecus Cocco, 1829: 146 (type species: ArgyropeJecus hemigijmnus Cocco, 1829, bv monotypy). Fleurothysls Lowe, 1843: 64 (type species: Sterno- ptyx olfersi Ciivier, 1843, by original designa- tion ). Sternoptychides Ogill^y, 1888: 1313 (type spe- cies: Sternoptychides amahUis Ogilby, 1888, by monotypy). Diapi
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Marine Hatchetfishes • Baiid 31. Figure 18. Photophore characteristics: genus Sternoptyx. Abbreviations: see p. 6. bladder present (see above for osteological description). Genus ArgyropeJecus Cocco, 1829 Argijropelecus Cocco, 1829: 146 (type species: ArgyropeJecus hemigijmnus Cocco, 1829, bv monotypy). Fleurothysls Lowe, 1843: 64 (type species: Sterno- ptyx olfersi Ciivier, 1843, by original designa- tion ). Sternoptychides Ogill^y, 1888: 1313 (type spe- cies: Sternoptychides amahUis Ogilby, 1888, by monotypy). Diapiosis. Twelve abdominal, six supra- abdominal and two suprapectoral photo- phores; eyes telescopic, dorsally oriented; frontal ridges compressed dorsally above eyes; basisphenoid absent; several teeth directed anteriorly on posterior maxillary margin; dorsal "blade" consisting of several broadened pterygiophores anterior to dor- sal rays; seven enlarged pleural ribs. Description. Photophorcs: PO 1; PTO 1; BR 6; I 6; AB 12; PRO 1; so 1; SP 2; SAB 6; PAN 4; AN 6; SC 4 (for anatomical details see Brauer, 1908; Bassot, 1966). Spines: Post-temporals extended pos- teriorly to form a small spine; preopercle bears one ventrally and one posteriorly directed spine; retroarticular bears ven- trally directed spine; basipterygia extended ventrally bearing one or two postabdominal spines; cleithrum extends ventrally form- ing preabdominal spine; spiny scales present in adults of some species below subcaudal and preanal photophorcs. Eyes: Large, well developed, telescopic, lens dorsally oriented, fitting into dorsal grooves in the frontal bone. Gill Rakers: Total 15-24; rakers well developed with rough toothlike surface; epi- and ceratobranchials bear well-de- veloped spines on internal surface. Jaws and Dentition: Jaws somewhat vertically oriented; premaxilla well de- veloped, toothed, and majoi- upper jaw bone in gape; maxilla also somewhat in-. Please note that these images are
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