Chirocentrodon bleekerianus (Poey, 1867)

(Pristigasteridae, Clupeiformes)

Chirocentrodon bleekerianus é uma espécie de pequeno porte que se distribui desde o Panamá até o Estado de São Paulo. Atinge em média 11 cm de comprimento. Alimentase de crustáceos zooplanctonicos, zoobentos e peixes muito pequenos (MUTO et al., 2008; FIGUEIREDO e MENEZES, 1978; FROESE e PAULY, 2013).

The collection contains otoliths from 330 individuals of this species, ranging from 65 to 128 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 29 analysed otoliths. See more detailed data here (in portuguese).

Otoliths from Chirocentrodon bleekerianus, with total length of A. 65mm; B. 92mm; C. 116mm; 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: peaked. Posterior region: rounded. Dorsal edge: sinuate to entire (72%), entire (21%), sinuate (7%). Ventral edge: serrate to entire. Profile: biconvex. Rostrum and antirostrum orientation: in agreement. Rostrum: Developed. Antirostrum: absent. Pseudorostrum: absent. Pseudoantirostrum: absent. Sulcus acusticus: position median, orientation horizontal (93%), slightly descending (7%), opening ostial (72%), pseudo-ostial (28%), morphology pseudo-archaesulcoid, colliculum heteromorphic, ostium elliptic, cauda elliptic.
Description of the terms used

Morphometry:

Shape indices	Mean ± sd	Minimum	Maximum
OL / TL %	2.38 ± 0.36	1.98	3.49
OH / OL %	70.11 ± 4.44	61.99	77.01
OT / OL %	20.57 ± 1.73	18.11	25.21
OT / OH %	29.43 ± 2.92	24.63	39.07
Circularity	17.67 ± 0.96	15.85	19.39
Rectangularity	0.69 ± 0.02	0.62	0.72

Description of the abbreviations used

* Vouchers:
Collection identifier for the individuals shown on photography and drawings:

5.2.CHBL.SARVI.AM.10.3 (65 mm)
5.2.CHBL.SARIV.AM.18.60 (92 mm)
5.2.CHBL.SARIV.AM.18.13 (116 mm)

For more information about this species: