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Larvae Information Summary for
Syngnathus acus
| 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) | 28 | 24 | 26 | |
| Preanal L. % TL | 40.5 |
| Place of development | attached to parental body | |||
| Larval area | to be filled | |||
| Yolk-sac | Ref: | |||
| Yolk | Oil globules | |||
| Rows on tail | no rows | |||
| Other melanophores on tail | more than two dorso-ventral clusters or bands | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Cutaneous bony rings distinct. on the back, every 3-4 rings show some light spots, like transverse stripes (totaly 13-14). | ||||
Post larvae
| Striking feature | tube-like snout | |||
| Striking shape lateral | eel-like | dorsal | ||
| Striking feature | tube-like snout | |||
| Shape of gut | tube-like | |||
| Gas bladder early | late | |||
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | more than two dorso-ventral clusters or bands | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | more than two dorso-ventral clusters or bands | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | pigmented | late | pigmented | |
| Peritoneum | with row of melanophores | |||
| Pectorals | normal with few scattered melanophores | |||
| Pelvics | normal (i.e. small or absent) | |||
| Primordial fin absent, definitive caudal developed. Dorsal fin with 35-39 rays, extending over 8 segments, longer than the head, 3-4 anal rays, 12-14 pectoral rays and 9-10 caudal rays. Eye more than twice the primordial space. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of myomeres | 60 | 56 | 58 | |
| Preanal number of myomeres | 19 | 17 | 18 |
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | 26 | Sep | Oct | Nov | Dec | |
| Water parameters Metric characters |
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