Striped Rabbitfish

description

BDL (mm) 237.0 216.4 ± 27.7 171.0 – 246.0 266.1 ± 33.8 202.0 – 308.0 Measurements in percentage of BDL SVL 143.0 60.3 57.6 ± 3.6 51.1 – 63.2 60.9 ± 2.5 57.1 – 65.8 TRL 89.3 37.7 34.2 ± 1.9 31.4 – 36.4 38.6 ± 1.7 36.1 – 42.3 PD 1 64.0 27.0 27.2 ± 3.0 22.0 – 31.6 27.2 ± 1.8 24.9 – 30.5 PD 2 111.0 46.8 48.4 ± 3.6 44.5 – 53.8 49.0 ± 2.4 44.3 – 53.0 D 2 B 187.0 78.9 75.9 ± 3.9 72.3 – 84.2 75.4 ± 3.8 69.4 – 83.2 D 2 AH 12.6 5.3 4.8 ± 0.9 3.7 – 6.1 5.1 ± 0.5 4.4 – 6.0 D 2 PH 8.6 3.6 3.4 ± 0.5 2.8 – 4.3 2.7 ± 0.6 1.3 – 3.7 CDM 56.2 23.7 23.3 ± 2.6 19.8 – 27.7 23.5 ± 1.6 20.9 – 26.7 CDH 5.6 2.4 2.4 ± 0.9 1.3 – 3.8 2.8 ± 0.6 1.7 – 3.9 CVM 69.0 29.1 30.9 ± 5.6 25.1 – 41.7 33.3 ± 2.0 30.1 – 37.0 CVH 6.8 2.9 2.4 ± 0.6 2.0 – 3.7 2.8 ± 0.6 2.0 – 3.9 HDL 59.0 24.9 22.8 ± 3.2 17.6 – 27.4 22.9 ± 2.7 19.1 – 28.0 POB 29.2 12.3 11.4 ± 1.8 8.4 – 14.0 11.4 ± 1.4 10.1 – 14.4 D 1 B 38.0 16.0 15.9 ± 1.3 13.7 – 17.4 16.3 ± 2.1 13.6 – 20.5 DSA 59.3 25.0 24.6 ± 2.6 20.7 – 26.9 23.5 ± 1.1 21.9 – 25.5 D 1 H 55.6 23.5 19.7 ± 2.2 16.3 – 22.2 18.6 ± 1.3 15.8 – 20.3 P 1 A 111.0 46.8 45.8 ± 2.5 42.7 – 49.6 43.0 ± 2.4 39.4 – 47.0 P 2 A 55.2 23.3 21.2 ± 2.8 17.7 – 25.8 21.5 ± 1.4 20.0 – 24.8 IDS 7.5 3.2 4.8 ± 2.0 2.7 –

Hydrolagus matallanasi sp. nov. (Holocephali, Chimaeridae) a new species of rabbitfish from southern Brazil

description

Comparisons. Hydrolagus matallanasi and H. mirabilis share an indented second dorsal fin, but are easily distinguished by: colour pattern (reticulations and spots covering the body dorsolaterally vs body uniform pale brown); ventral pectoral­fin bases (brownish white vs pale brown); eye length (about 2 / 3 of preorbital length vs nearly equal to preorbital length); tooth plates coloration (striped and bicolor, yellowish and gray vs yellowish); and dorsal­spine length (equal to or a slightly longer than head length vs 4 / 5 of head length). Another Atlantic species, H. alberti, is not similar to the new species, as its upper second dorsal fin margin is straight while in H. matallanasi it is notably concave near the middle of the second dorsal fin base. Coloration also differs among these two species, as H. alberti is pale brown with no reticulations or spots. 22 º Rio de Janeiro 24 º South Santos 26 º Itajaí 28 º 30 º 32 º Rio Grande 34 º 1000 500 100 36 º 54 º 52 º 50 º 48 º 46 º 44 º 42 º 40 º

Hydrolagus matallanasi sp. nov. (Holocephali, Chimaeridae) a new species of rabbitfish from southern Brazil

distribution

Distribution. Twenty­one specimens were collected at seven stations off the states of Santa Catarina (2 sta., 4 specimens) and Rio de Janeiro (5 sta., 17 specimens), southern Brazil, between 23 º 42 ' S and 30 º 18 ' S, 416 – 736 m depth (Fig. 5).

Hydrolagus matallanasi sp. nov. (Holocephali, Chimaeridae) a new species of rabbitfish from southern Brazil

etymology

Etymology. Named in honor of Dr. Jesús Matallanas Garcia, in recognition of his extensive work and tireless dedication to ichthyology. Biological and ecological notes. Males range in size from 234 to 302 mm PCL (n = 8) and mature at or around 296 mm PCL. Females range from 268 to 378 mm PCL (n = 13). Gorgonians, hard corals, tube sponges, crinoids, and ophiuroids were taken near collecting sites of H. matallanasi providing evidence that this species inhabits deep­reefs on the continental slope, usually deeper than 400 m. It also shares this habitat with the sharks Heptranchias perlo, Scyliorhinus haeckelii, Galeus mincaronei, Schroederichthys saurisqualus, Squalus sp., and the skate Gurgesiella dorsalifera.

Hydrolagus matallanasi sp. nov. (Holocephali, Chimaeridae) a new species of rabbitfish from southern Brazil