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Larvae Information Summary for
Parodon guyanensis
| Main Ref: | Ponton, D. and S. Mérigoux 2001 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | ||||
| Preanal L. % TL |
| Place of development | in close association with substrate | |||
| Larval area | River Sinnamary | |||
| Yolk-sac | Ref: | |||
| Yolk | Oil globules | |||
| Rows on tail | ||||
| Other melanophores on tail | ||||
Post larvae
| Striking feature | none | |||
| Striking shape lateral | normal (not striking) | dorsal | ||
| Striking feature | none | |||
| Shape of gut | ||||
| Gas bladder early | late | |||
| Spinal armature early | late | |||
| Pigmentation early | ||||
| Rows on tail | ventral + lateral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Rows on tail | dorsal + lateral row | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pectorals | normal without melanophores | |||
| Pelvics | normal (i.e. small or absent) without melanophores | |||
| At 8.5-9.0 mm, head is ovate and small to moderate; snout is pointed; the oblique mouth reaches to the anterior edge of the eyes; eyes are of moderate size and obliquely elongate. Gut is straight and reaches 60% of BL. Caudal fin has incipient rays. Has dorsal double row of melanophores, ventral series of large melnophores, and thin mediolateral line. At 10.0 m, body deepens and becomes more cylindrical. All fin rays are present except those of the pectoral fin but remnant of the finfold can be observed ventrally. Dorsal and ventral fins are positioned at mid-body oppositely from each other. A large band of melanophores persists ventrally behind the head. At 15.0 mm, the mouth is terminal, eyes became round, and all fins are complete. The lateral band of melanophores is enlarged, dorsal surface of the entire body is dark and a characteristic band of melanophores bisects the eye and extend onto the snout. At 40.0 mm, juveniles look like adults. | ||||
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | Sep | Oct | Nov | Dec | ||
| Similar species 1 | 27914Piabucusdentatus |
| Remarks | |
| Has less pointed snout and shorter gut than P. guyanensis. | |
| Water parameters Metric characters |
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