Fig. ni~Lampanyctus festivus. holotype, 101.0 mm. From Nafpaktitis and Nafpaktitis 



(1969, p. 58. fig. 48). 



Lampanyctus acanthurus 



Wisner, 1974 



Fig. 172 — Lapmanyclus acanthurus. holotype, male, 93.3 mm. From Wisner (1974, p. 37, 



fig. 8). 



Description 



D. 13 (14); A. 17 (16-18); AO 6 (5) + 7 (8), total 13 (12-14); gill rakers 5 (6) + 1 -^ 10 

 (9-11), total 16 (15-18); vertebrae 36. 



Particularly diagnostic of this species is the high number of procurrent caudal rays, 9 

 (8-10) above and 10 (11) below, a number higher than found in any other species of the genus. 



PLO, SAO,, upper Pol, and Pre one or two of their diameters below lateral line; PLO about 

 three of its diameters before a vertical from origin of pectoral fin. VLO slightly nearer lateral 

 line than to base of pelvic fin and on or very near a line from PLO to SAO,. VO series curved; 

 VO2 elevated at least its diameter above levels of VO, and VO3. SAO, usually above level of 

 SAO2 and on or a little before vertical from VO^; SAOj about over anal origin; SAO.1 slightly 

 behind vertical from first AOa; a line through SAOa and SAOj passes through or a little behind 

 VO^. AOa series curved, AOa, depressed and AOa^ raised by about three diameters. All AOp 

 behind anal base; AOp and Pre series continuous. Pre .3.4 interspace about equal to that be- 

 tween Prci.3; Prc^ slightly behind vertical from Prc3. 



Supracaudal luminous gland very short, of about 2 coalesced scales; infracaudal gland 

 long, of 7 (6-8) overlapping, noncoalesced scales. 



Size: To 112 mm (largest of 21 specimens). 



Least depth of capture: To 800 m at night. 



Distribution: Most specimens were taken about 600 mi (960 km) north of Hawaii (27° to 

 31° N,155° W); two specimens known from about 350 mi (560 km) west of Point Conception, 

 California. 

 Discussion 



L. acanthurus appears to be most closely related to the poorly understood nominal species 

 L. tenuiformis and L. festivus, discussed above. 



185 



