Ariosoma opistophthalmum (Ranzani, 1840)
(Congridae, Anguilliformes)
The collection contains otoliths from 13 individuals of this species, ranging from 178 to 335 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 7 analysed otoliths. See more detailed data here (in portuguese).
Otoliths from Ariosoma opistophthalmum, with total length of A. 215mm; B. 335mm; internal side A1; B1; external side A2; B2; profile of the ventral region A3; B3; click the figures for larger version*
Morphology:
Shape: oval. Anterior region: rounded. Posterior region: peaked-round. Dorsal edge: entire. Ventral edge: entire. Profile: plane-convex. Rostrum and antirostrum orientation: not applicable. Rostrum: absent. Antirostrum: absent. Pseudorostrum: absent. Pseudoantirostrum: absent. Sulcus acusticus: position median, orientation ascending (71%), horizontal (29%), opening para-ostial (57%), mesial (43%), morphology heterosulcoid, colliculum heteromorphic, ostium oval (71%), elliptic (29%), cauda straight tubular (86%), slightly curved tubular (14%).
Description of the terms used
Morphometry:
Shape indices | Mean ± sd | Minimum | Maximum |
---|---|---|---|
OL / TL % | 2.01 ± 0.17 | 1.80 | 2.26 |
OH / OL % | 79.50 ± 4.6 | 72.08 | 85.19 |
OT / OL % | 19.86 ± 2.04 | 17.38 | 23.00 |
OT / OH % | 24.96 ± 1.8 | 23.22 | 28.21 |
Circularity | 14.22 ± 0.17 | 14.01 | 14.47 |
Rectangularity | 0.68 ± 0.01 | 0.67 | 0.70 |
* Vouchers:
Collection identifier for the individuals shown on photography and drawings:
- 3.9.AROP.PI.AF.4857.5 (215 mm)
- 3.9.AROP.PI.AF.7.1 (335 mm)
For more information about this species: