. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. THE SOUTH AFRICAN MUSEUM'S MEIRING NAUDE CRUISES 91. r<; Fig. 19. Triphoturus nigrescens (SM 157). Scale 10 mm. and with PO4 elevated and anteriorly displaced to directly on, anterior to or be- hind vertical through PO3 and at level of upper pectoral base or slightly higher. PVOi above PO1-PO2 interspace, closer to POi than to PO2 and at about level of Op2; PVO2 on or slightly behind vertical through PVOi and below level of upper pectoral base. PLO well in advance of vertical through upper pectora
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. THE SOUTH AFRICAN MUSEUM'S MEIRING NAUDE CRUISES 91. r<; Fig. 19. Triphoturus nigrescens (SM 157). Scale 10 mm. and with PO4 elevated and anteriorly displaced to directly on, anterior to or be- hind vertical through PO3 and at level of upper pectoral base or slightly higher. PVOi above PO1-PO2 interspace, closer to POi than to PO2 and at about level of Op2; PVO2 on or slightly behind vertical through PVOi and below level of upper pectoral base. PLO well in advance of vertical through upper pectoral base, at or less than one photophore diameter below lateral line. 5 VO, with VO2 elevated and anteriorly displaced to before VOi. SAO angulate, with SAOi nearer to VO3, above VO3-VO4 interspace or above VO4 and at level of ventral margin of orbit, with SAO2 above anal origin and at level of SAOi, and with SAO3 behind vertical through anal origin and touching lateral line. AOa level, with AOa1—AOa2 interspace greatest; AOp level. 2 Pol, with Poh behind last AOa and with P0I2 in advance of vertical through adipose origin and touching lateral line. 3 Pre, in straight ascending line, with Prc2 nearer to Prci and touch- ing line through centres of Prci and Prc3, or slightly below this line; Prc3 above level of lateral line. Supracaudal gland with 4 overlapping, luminous scales; infracaudal gland with 5 overlapping, luminous scales. Maximum length 40 mm. Distribution High-oceanic, mesopelagic: in upper 24 m at night. Indian Ocean: 08°N to 15°S. Pacific Ocean: 30°N to 30°S (but see Remarks). Remarks No sexually mature specimens were taken during the Meiring Naude cruises. The taxonomic status of species of the genus Triphoturus in the Indo-Pacific is at present unresolved. Hulley (1981) has pointed out that the type series of Myctophum (Lampanyctus) micropterum Brauer, 1906, comprises two species: Lampanyctus isaacsi Wisner, 1974 (ZMB 17614, 17615—Gulf of Guinea) and Triphot
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
