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Myliobatiformes (Stingrays) >
Potamotrygonidae (River stingrays) > Potamotrygoninae
Etymology: rosai: This new species is named after Ricardo S. Rosa, whose excellent revision of potamotrygonids (Rosa, 1985a) represents a landmark in our understanding of the taxonomy and diversity of this family.
Eponymy: Dr Ricardo de Souza Rosa (d: 1954) is a Brazilian ichthyologist who is a Professor at the Department of Systematics and Ecology, Federal University of Paraíba, Brazil. [...] (Ref. 128868), visit book page.
Environment: milieu / climate zone / Mức độ sâu / distribution range
Sinh thái học
; Nước ngọt Sống nổi và đáy. Tropical; 0°S - 1°S, 48°W - 49°W
South America: Brazil in the upper, mid and lower Rio Amazonas basin, and probably in the lower reaches of its major tributaries.
Bộ gần gũi / Khối lượng (Trọng lượng) / Age
Chín muồi sinh dục: Lm ? range ? - ? cm
Max length : 80.0 cm WD con đực/không giới tính; (Ref. 86515)
Short description
Khóa để định loại | Hình thái học | Sinh trắc học
Can be diagnosed by its unique dorsal color pattern, composed of numerous white to creamy-white vermiculate markings over a light brown, tan or gray background color. This species is tentatively further separated from H. gomesi by presenting a slightly more slender tail width at base (5.5% DW in holotype of H. rosai vs. 4.5% DW in holotype of H. gomesi), slightly greater preorbital snout length (31% DW in holotype of H. rosai vs. 33.2% DW in holotype of H. gomesi), and smaller pectoral axil to pelvic inner length (4.6% DW in holotype of H. rosai, ranging from 1.3 to 4.9% DW in all specimens, with a mean of 3.7% DW vs. 2.1% DW in holotype of H. gomesi, and ranging from 1.0 to 3.3% DW in all specimens, with a mean of 1.9% DW) (Ref. 86515).
Body shape (shape guide): other; Cross section: flattened.
Life cycle and mating behavior
Chín muồi sinh dục | Sự tái sinh sản | Đẻ trứng | Các trứng | Sự sinh sản | Ấu trùng
de Carvalho, M.R. and N.R. Lovejoy, 2011. Morphology and phylogenetic relationships of a remarkable new genus and two new species of Neotropical freshwater stingrays from the Amazon basin (Chondrichthyes: Potamotrygonidae). Zootaxa 2776:13-48. (Ref. 86515)
IUCN Red List Status (Ref. 130435: Version 2025-1)
Threat to humans
Harmless
Human uses
Các công cụ
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Estimates based on models
Phylogenetic diversity index (Tài liệu tham khảo
82804): PD
50 = 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
Mức dinh dưỡng (Tài liệu tham khảo
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): High vulnerability (58 of 100).
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![Image of Heliotrygon rosai (Rosa\](/images/thumbnails/gif/tn_POTAMOT0.gif "Image of Heliotrygon rosai (Rosa\")
