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Larvae Information Summary for
Pseudobathylagus milleri
| Main Ref: | Moser, H.G. and E.H. Ahlstrom 1996 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 5 | 35604 | ||
| Preanal L. % TL |
| Place of development | planktonic | |||
| Larval area | Northeastern Pacific (California Current region); Northwestern Pacific (Japan) | |||
| Yolk-sac | Ref: | |||
| Yolk | Oil globules | |||
| Rows on tail | no rows | |||
| Other melanophores on tail | one dorso-ventral cluster or band | |||
| Melanophores on head + trunk | no melanophores on head or trunk | |||
| Pigmentation: blotch anteriorly to notochord tip. | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | eel-like | dorsal | ||
| Striking feature | none | |||
| Shape of gut | elongated | |||
| Gas bladder early | late | |||
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | one dorso-ventral cluster or band | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | one dorso-ventral cluster or band | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | pigmented | late | pigmented | |
| Peritoneum | with row of melanophores | |||
| Pectorals | normal melanophores at fin base | |||
| Pelvics | normal (i.e. small or absent) without melanophores | |||
| Gut shorter (usually only 50% SL) than in other species; eye rounder and larger than in other bathylagids (not stalked); fin rays develop in finfold, away from body margin; large size at hatching, notochord flexion, and transformation; larval pigment visible in juveniles up to about 50 mm SL; low preanal myomere count (about 24-25); high postanal myomere count (about 27-28), and high total count (49-53); low dorsal fin ray count (6-9); high anal fin ray count (20-28) (Ref. 35604). Pigmentation: large isolated melanophores. Preflexion: pigment on lower jaw, midgut, and tail. Flexion: opposing dorsal and ventral midline melanophores; large melanophores on head and pectoral fin base; large lateral blotch at base of caudal fin. Sequence of fin development: caudal, dorsal, anal, pectorals, pelvics Distinguishing characters from other bathylagids without eyestalks: large isolated spots; B. wesethi has a series of melanophoes along hypaxial region, large eye, and spots posteriorly along dorsal midline; Leuroglossusspp. larvae have smaller ayes and no dorsal spots. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of myomeres | 53 | 49 | 35604 | |
| Preanal number of myomeres | 25 | 24 | 35604 |
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | Sep | Oct | Nov | Dec | ||
| Water parameters Metric characters |
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