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Stomiiformes - Stomiidae

Tactostoma macropus (Longfin Dragonfish)

Illustration Meristics Life History ELH Descr. Distribution Footnotes
More information for this taxon at: LarvalBase | FishBase | Univ. Washington Data


Egg Diameter (min-max in mm): 1.37 - 1.55
Number of Oil Globules (min-max): 1
Oil Globule Diameter (min-max in mm): 0.3 - 0.4
Yolk: Segmented
Chorion: Smooth
Egg/Embryo Pigment: none,
Pigment Diagnostics:
Diagnostic Characters: Oil globule large and ventral, egg round


Hatch Size (min-max in mm SL): 5
Preanal Length (%SL): >75
Flexion Length (in mm SL):
Length at Transformation (in mm SL): 44 - 49
Fin Development Sequence: Caudal, dorsal and anal, pectorals and pelvics
Larval Pigment Regions: In each developmental larval stage, pigment is present in the regions listed below
(click for pigment regions)
Yolk-sac: dorsal, ventral,
Preflexion: nape, dorsal, ventral,
Flexion: mouth, nape, isthmus, dorsal gut, pectoral fin, dorsal, ventral, mediolateral,
Postflexion: mouth, isthmus, dorsal gut, dorsal, ventral, mediolateral,
Juvenile: mouth, cheek, isthmus, dorsal gut, ventral,
Pigment Diagnostics: Decrease in pigment with development; finfolds unpigmented. Distinguished from Chauliodus macouni by: presence of pigment
Diagnostic Characters: Body elongate and flat, gut slender, finfold moderate, pectoral fin lost at transformation, decrease in pigment with development, no trailing gut, finfolds unpigmented. Distinguished from Chauliodus macouni by: presence of pigment, posterior position of dorsal fin (origin of dorsal and anal fin opposite each other)

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last updated: August 2019