Polydactylus virginicus (Linnaeus, 1758)
(Polynemidae, Perciformes)
The collection contains otoliths from 24 individuals of this species, ranging from 215 to 352 mm of total length. Click here to see the map of the sampling area for the individuals of this species. The following summaries contains data from 12 analysed otoliths. See more detailed data here (in portuguese).
Otoliths from Polydactylus virginicus, with total length of A. 215mm; B. 344mm; internal side A1; B1; external side A2; B2; profile of the ventral region A3; B3; click the figures for larger version*
Morphology:
Shape: oblong (67%), oblong to rectangular (33%). Anterior region: flattened (42%), rounded (33%), oblique-round (25%). Posterior region: oblique (50%), rounded (25%), peaked-round (25%). Dorsal edge: lobed to sinuate (83%), sinuate to entire (17%). Ventral edge: sinuate to entire (75%), lobed to sinuate (17%), entire (8%). Profile: concave-convex. Rostrum and antirostrum orientation: in agreement. Rostrum: underdeveloped. Antirostrum: Developed (58%), underdeveloped (42%). Pseudorostrum: absent. Pseudoantirostrum: absent. Sulcus acusticus: position median, orientation horizontal (67%), descending (33%), opening ostial, morphology heterosulcoid, colliculum heteromorphic, ostium funnel-like, cauda strongly curved tubular (75%), markedly curved tubular (25%).
Description of the terms used
Morphometry:
Shape indices | Mean ± sd | Minimum | Maximum |
---|---|---|---|
OL / TL % | 2.40 ± 0.13 | 2.19 | 2.73 |
OH / OL % | 49.17 ± 1.88 | 45.85 | 51.57 |
OT / OL % | 15.02 ± 1.06 | 13.44 | 16.80 |
OT / OH % | 30.57 ± 2.1 | 26.27 | 33.59 |
Circularity | 21.38 ± 1.7 | 19.31 | 24.61 |
Rectangularity | 0.71 ± 0.03 | 0.67 | 0.76 |
* Vouchers:
Collection identifier for the individuals shown on photography and drawings:
- 25.21.POVI.BAIV.TP.1/5.1 (215 mm)
- 25.21.POVI.BAIV.RAB.1/1.1 (344 mm)
For more information about this species: