Malacocephalus laevis (Lowe, 1843)
(Macrouridae, Gadiformes)
Cosmopolita, habita águas dos oceanos Atlântico, Índico e Pacífico. No Atlântico Ocidental distribui-se do Golfo do México ao sul do Brasil. É uma espécie batidemersal, que vive no talude continental entre as profundidades de 200 e 1000 m, sendo mais comum entre 300 e 750 m. Atinge 700 mm de comprimento e alimenta-se de crustáceos e lulas (Bernardes et al. 2005).
The collection contains otoliths from 61 individuals of this species, ranging from 211 to 424 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 36 analysed otoliths. See more detailed data here (in portuguese).
Otoliths from Malacocephalus laevis, with total length of A. 294mm; B. 345mm; C. 424mm; 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. Anterior region: oblique to peaked (53%), oblique to peaked-round (36%), oblique to angled-round (11%). Posterior region: oblique-round (75%), oblique to peaked-round (25%). Dorsal edge: lobed to sinuate (83%), sinuate (8%), lobed (8%). Ventral edge: lobed to sinuate (67%), sinuate (19%), sinuate to entire (8%), lobed (6%). Profile: plane-convex (69%), biconvex (31%). Rostrum and antirostrum orientation: in agreement. Rostrum: underdeveloped. Antirostrum: underdeveloped (64%), absent (36%). Pseudorostrum: underdeveloped. Pseudoantirostrum: absent. Sulcus acusticus: position supramedian, orientation slightly ascending (61%), horizontal (33%), ascending (6%), opening ostiocaudal (58%), caudal (22%), pseudo-ostiocaudal (11%), para-ostial (8%), morphology homosulcoid, colliculum homomorphic, ostium elliptic, cauda elliptic.
Description of the terms used
Morphometry:
| Shape indices | Mean ± sd | Minimum | Maximum |
|---|---|---|---|
| OL / TL % | 3.13 ± 0.3 | 2.80 | 4.47 |
| OH / OL % | 57.69 ± 3.17 | 50.66 | 63.24 |
| OT / OL % | 18.44 ± 1.52 | 15.72 | 22.01 |
| OT / OH % | 32.01 ± 2.59 | 26.51 | 36.52 |
| Circularity | 17.45 ± 0.86 | 15.70 | 19.38 |
| Rectangularity | 0.72 ± 0.01 | 0.70 | 0.77 |
* Vouchers:
Collection identifier for the individuals shown on photography and drawings:
- 14.1.MALA.REV.AF.1002.2 (294 mm)
- 14.1.MALA.REV.AF.1142.1 (345 mm)
- 14.1.MALA.REV.AF.1129.1 (424 mm)
For more information about this species: