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Myctophiformes - Myctophidae Diaphus theta (California Headlightfish)
Illustration	Meristics	Life History	ELH Descr.	Distribution	Footnotes
More information for this taxon at: LarvalBase | FishBase | Univ. Washington Data

BONY PARTS (min-mode-max)

Vertebrae		Gill Rakers and Branchiostegal Rays
Total	34 - 35 - 36	Upper Gill Rakers	5 - X - 7
Precaudal	15 - 16 - 16	Lower Gill Rakers	12 - 15 - 16
Caudal	18 - 19 - 20	Branchiostegal Rays	9 - 9 - 9

FIN COUNTS (min-mode-max)

Fin (position)	Spines	Rays	Caudal Fin Counts
Pelvic (Abdominal)	0 - 0 - 0	7 - X - 8	Caudal Upper Secondary	6 - 7 - 8
Dorsal	0 - 0 - 0	11 - 13 - 15	Caudal Upper Principal	10 - 10 - 10
Pectoral	NA	91 - X - 12	Caudal Lower Principal	9 - 9 - 9
Anal	0 - 0 - 0	12 - 13 - 14	Caudal Lower Secondary	6 - 7 - 8

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last updated: April 2025