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Larvae Information Summary for
Gymnammodytes semisquamatus
| Main Ref: | Russell, F.S. 1976 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 3 | |||
| Preanal L. % TL |
| Place of development | planktonic | |||
| Larval area | to be filled | |||
| Yolk-sac | pigmented | Ref: | ||
| Yolk | Oil globules | one oil globule | ||
| Rows on tail | ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | no melanophores on head or trunk | |||
| Dorsal gut pigmentation of about 16 melanophores, postanal ventral pigment of about 15 melanophores, ventral margin of the primordial fin: 13 melanophores. | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | eel-like | dorsal | normal (not striking) | |
| Striking feature | none | |||
| Shape of gut | tube-like | |||
| Gas bladder early | invisible | late | invisible | |
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on trunk | |||
| Pigmentation late | ||||
| Rows on tail | ventral row | |||
| Other melanophores on tail | tail with single melanophore | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | pigmented | late | pigmented | |
| Peritoneum | with row of melanophores | |||
| Pectorals | normal without melanophores | |||
| Pelvics | normal (i.e. small or absent) | |||
| At 8-10 mm length : 2-5 dorsal melanophores at the posterior end of the tail. 1 or more melanophores on the crown of the head. Denticles on the margin of the upper jaw appear at 7 mm. The notochord turns up at 9 mm and the upper jaw becomes very protrusible. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 72 | 64 | 68 | 37 |
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | 4 | Sep | Oct | Nov | Dec | |
| Water parameters Metric characters |
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