Diapterus rhombeus (Valenciennes, 1830)
(Gerreidae, Perciformes)
The collection contains otoliths from 590 individuals of this species, ranging from 14 to 255 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 94 analysed otoliths. See more detailed data here (in portuguese).
Otoliths from Diapterus rhombeus, with total length of A. 75mm; B. 152mm; C. 230mm; internal side A1; B1; C1; external side A2; B2; C2; profile of the ventral region A3; B3; C3; click the figures for larger version*
Morphology:
Shape: elliptic (33%), rhomboidal to pentagonal (31%), elliptic to rhomboidal (26%), discoidal (9%). Anterior region: angled-round (62%), angled (16%), peaked (10%), peaked-round (9%). Posterior region: oblique to angled (31%), oblique (30%), oblique-round (19%), rounded (11%). Anterior dorsal edge: sinuate (48%), lobed to sinuate (27%), sinuate to entire (10%), crenate (5%). Posterior dorsal edge: (67%), sinuate (13%), lobed (10%), crenate (9%). Central dorsal edge: (67%), sinuate (14%), lobed (10%), crenate (5%). Anterior ventral edge: sinuate (45%), lobed to sinuate (21%), crenate (17%), sinuate to entire (7%). Posterior ventral edge: (67%), sinuate (18%), lobed (7%), crenate (7%). Profile: concave-convex (84%), biconvex (16%). Rostrum and antirostrum orientation: in agreement (57%), not applicable (43%). Rostrum: Developed (96%), underdeveloped (4%). Antirostrum: underdeveloped (60%), absent (40%). Pseudorostrum: absent. Pseudoantirostrum: absent. Sulcus acusticus: position supramedian (84%), median (16%), orientation horizontal (61%), descending (39%), opening ostial, morphology heterosulcoid, colliculum heteromorphic, ostium funnel-like (86%), elliptic (14%), cauda slightly curved tubular (70%), straight tubular (28%), strongly curved tubular (2%).
Description of the terms used
Morphometry:
Shape indices | Mean ± sd | Minimum | Maximum |
---|---|---|---|
OL / TL % | 4.22 ± 0.37 | 3.68 | 5.85 |
OH / OL % | 76.21 ± 9.11 | 58.58 | 92.09 |
OT / OL % | 19.08 ± 4.4 | 13.96 | 32.00 |
OT / OH % | 24.84 ± 3.5 | 19.78 | 36.92 |
Circularity | 18.22 ± 1.99 | 14.11 | 22.72 |
Rectangularity | 0.68 ± 0.01 | 0.65 | 0.71 |
* Vouchers:
Collection identifier for the individuals shown on photography and drawings:
- 25.17.DIRH.BAIII.AF.11/1.8 (75 mm)
- 25.17.DIRH.BAIII.AF.12/1.28 (152 mm)
- 25.17.DIRH.BAIII.AF.1/1.1 (230 mm)
For more information about this species: