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Southwest Atlantic: from northern Argentina to southern Brazil. 西南大西洋: 巴西 (參考文獻 6902) 到阿根廷.(參考文獻 58839)
初熟時的長度 / 大小 / 重量 / 年齡
成熟度: Lm46.4 range ? - ? cm Max length : 53.4 cm TL 雄魚/尚未辨別雌雄; (Ref. 115173); 59.3 cm TL (female); common length : 50.0 cm TL 雄魚/尚未辨別雌雄; (Ref. 6077); 最大體重: 758.00 g (Ref. ); 最大體重: 758.00 g
Obtuse snout, broader heart shaped disc. Olive to brownish gray above, without definite markings, dorsal and caudal darker than general ground tint, margins of pectoral and pelvic fins paler. Lower surface grayish or yellowish white, posterior corners of pectoral fins and tips of pelvic fins more or less dusky (Ref. 6902). Body shape (shape guide): other. 圓頭的吻, 比較寬的心形體盤。 橄欖色對灰褐色上方, 沒有固定的斑紋，背鰭與尾鰭顏色比底色深, 胸鰭與腹鰭灰白的邊緣。 下表面淺灰色或黃白色, 胸鰭後角與腹鰭頂端約略暗色的.(參考文獻 6902)
This benthic inshore species is found over soft bottoms to at least 50 m; feeds on benthic crustaceans and polychaetes. Gestation last about a year, produces litters of 1-8 pups in autumn (Ref. 114953). Ovoviviparous (Ref. 50449). Maturity size for males at 43-45 cm TL, females at 42-48 cm TL; birth size at 13-16 cm TL (Ref. 114953).
Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures (Ref. 50449).西南大西洋: 巴西 (參考文獻 6902) 到阿根廷.(參考文獻 58839)
Compagno, L.J.V., 1999. Checklist of living elasmobranchs. p. 471-498. In W.C. Hamlett (ed.) Sharks, skates, and rays: the biology of elasmobranch fishes. Johns Hopkins University Press, Maryland. (Ref. 35766)
