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Larvae Information Summary for
Argentina sialis
| Main Ref: | Matarese, A.C., A.W. Kendall, D.M. Blood and M.V. Vinter 1989 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 4 | 3.5 | ||
| Preanal L. % TL |
| Place of development | planktonic | |||
| Larval area | South of southern California to Oregon, 42-46°N | |||
| Yolk-sac | elongated pigmented | Ref: | 35603 | |
| Yolk | segmented | Oil globules | one oil globuleposteriorcentralunpigmented | |
| Rows on tail | dorsal + ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation: blotch above terminal gut region; 2 ventrolateral pairs widely spaced along gut/trunk juncture; above and below tail tip; ventral to anterior region of yolk sac; internally above roof of mouth. | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | normal (not striking) | dorsal | compressed | |
| 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 | tail completely covered with melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | tail partly covered with melanophores | |||
| 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) melanophores at fin base | |||
| Transverse rugae lining gut; fin rays form in finfold, away from body margin; distinguished from Nansenia candida by presence of internal head pigment, caudal pigment on preflexion larvae, and presence of fewer spots over gut. Pigmentation: internal head pigment; series of ventral trunk blotches extending from pectoral fin to end of gut; 1-2 large blotches postanal with a large caudal blotch; blotches expand with development. Sequence of fin development: caudal, dorsal and anal, pectorals, pelvics. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 51 | 47 | 265 |
| 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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