Hygophum hygomii (Lütken, 1892)
(Myctophidae, Myctophiformes)
The collection contains otoliths from 276 individuals of this species, ranging from 38 to 74 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 23 analysed otoliths. See more detailed data here (in portuguese).
Otoliths from Hygophum hygomii, with total length of A. 38mm; B. 74mm; internal side A1; B1; external side A2; B2; profile of the ventral region A3; B3; click the figures for larger version*
Morphology:
Shape: oval (52%), discoidal (48%). Anterior region: double-peaked (96%), blunt to angled (4%). Posterior region: rounded. Dorsal edge: lobed to sinuate (48%), sinuate to entire (39%), sinuate (13%). Ventral edge: lobed to sinuate (48%), sinuate to entire (39%), sinuate (13%). Profile: plane-convex. Rostrum and antirostrum orientation: in agreement. Rostrum: Developed (70%), underdeveloped (30%). Antirostrum: Developed (83%), underdeveloped (17%). Pseudorostrum: absent. Pseudoantirostrum: absent. Sulcus acusticus: position median, orientation horizontal (83%), ascending (13%), descending (4%), opening ostial, morphology heterosulcoid, colliculum heteromorphic, ostium tubular, cauda round-oval.
Description of the terms used
Morphometry:
Shape indices | Mean ± sd | Minimum | Maximum |
---|---|---|---|
OL / TL % | 7.99 ± 2.1 | 4.79 | 11.70 |
OH / OL % | 98.94 ± 4.15 | 90.63 | 106.56 |
OT / OL % | 23.09 ± 2.22 | 17.90 | 26.35 |
OT / OH % | 23.39 ± 2.55 | 17.72 | 28.82 |
Circularity | 14.29 ± 0.49 | 13.66 | 15.39 |
Rectangularity | 0.75 ± 0.04 | 0.71 | 0.90 |
* Vouchers:
Collection identifier for the individuals shown on photography and drawings:
- 10.2.HYHY.REVP.AM.385.50 (38 mm)
- 10.2.HYHY.REVP.AM.368.38 (74 mm)
For more information about this species: