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Larvae Information Summary for
Hemiodus quadrimaculatus
| 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 | normal (not striking) | |
| Striking feature | none | |||
| Shape of gut | elongated | |||
| Gas bladder early | late | |||
| Spinal armature early | late | |||
| 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 | no rows | |||
| Other melanophores on tail | one dorso-ventral cluster or band | |||
| Melanophores on head + trunk | melanophores on trunk | |||
| Urostyle region early | pigmented | late | unpigmented | |
| Peritoneum | without melanophores | |||
| Pectorals | normal | |||
| Pelvics | normal (i.e. small or absent) | |||
| Body is elongated and cylindrical; head is triangular and of moderate size; snout pointed; eyes round and moderately large; mouth barely reaches the eye. Gut is >80% BL. At 10.7 mm, caudal and dorsal fins are present. Finfold remnants are also present ventrally anterior to the anus. Adipose fin is present. Body pigmentation consists of one double dorsal and one single mediolateral line of melanophores starting at the anterior margin of the dorsal fin, and one ventral row of melanophores. At 18.0-19.0 mm, body deepens; eyes and mouth become smaller. Anal fin rays are present. Three of the four usual vertical black bands begin to appear laterally behind the pectoral fins, at the posterior margin of the dorsal final and anterior margin of the anal fin. Once the fourth bar appears, it resembles a triangular spot on the caudal peduncle. At 24.0 mm, juvenile stage is reached. | ||||
| 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 a more rounded snout and a shorter gut than H. quadrimaculatus. | |
| Similar species 2 | Parodonguyanensis |
| Remarks | |
| Much more pigmented than H. quadrimaculatus. | |
| Water parameters Metric characters |
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