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Larvae Information Summary for
Symphurus nigrescens
| Main Ref: | Bertolini, F., U. D'Ancona, E. Padoa Montalenti, S. Ranzi, L. Sanzo, A. Sparta, E. Tortonese and M. Vialli 1956 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 1.75 | 1.45 | 1.6 | |
| Preanal L. % TL |
| Place of development | ||||
| Larval area | to be filled | |||
| Yolk-sac | pigmented | Ref: | ||
| Yolk | Oil globules | no oil globule | ||
| Rows on tail | no rows | |||
| Other melanophores on tail | tail partly covered with melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Melanophores on the primordial fin at the dorsal and pectoral region. | ||||
Post larvae
| Striking feature | ||||
| Striking shape lateral | short and/or deep | dorsal | compressed | |
| Striking feature | ||||
| Shape of gut | spherical or gut loop | |||
| Gas bladder early | pigmented | late | pigmented | |
| Spinal armature early | late | |||
| Rows on tail | no rows | |||
| Other melanophores on tail | one dorso-ventral cluster or band | |||
| Rows on tail | no rows | |||
| Other melanophores on tail | one dorso-ventral cluster or band | |||
| Urostyle region early | pigmented | late | pigmented | |
| Peritoneum | covered with melanophores | |||
| Pectorals | normal | |||
| Pelvics | normal (i.e. small or absent) | |||
| At 6mm: D 85; A 70. At 8-9mm: D 5+85; A 76, the urochord has not yet turned up. The intestine partially hangs free out of the visceral sac. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 48 | |||
| Preanal number of vertebrae | 9 |
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | 5.5 | Sep | Oct | Nov | Dec | |
| Water parameters Metric characters |
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