Пластиножаберные (акулы и скаты) (sharks and rays) >
Rhinopristiformes (Shovelnose rays) >
Rhinidae (Wedgefishes)
Etymology: Rhynchobatus: Greek, rhingchos = snout + Greek, batis, -idos = a sting ray (Raja sp.) (Ref. 45335).
Eponymy: Sidney ‘Sid’ F Cook (1953–1997) was a shark fishery conservationist and biologist. [...] (Ref. 128868), visit book page.
Окружающая среда: среда / климатическая зона / пределы глубины / диапазон распространения
экология
морской pelagic-neritic; пределы глубины ? - 70 m (Ref. 114953). Tropical
распространение
Территории | регионы FAO | Экосистемы | места находок | карта точек | интродукции | Faunafri
Western Pacific: Singapore and Indonesia.
Размер / Вес / Возраст
половая зрелость: Lm ? range ? - ? cm
Max length : 81.0 cm TL самец/пол неопределен; (Ref. 109575)
Краткое описание
определительные ключи | морфология | морфометрия
This species is the smallest of the wedgefishes (to 81 cm TL), it has also the lowest vertebral count (less than 107 centra). It is distinguished from its congeners by the following characters: a long, hastate snout; very strongly undulate anterior pectoral-fin margin; dorsal mainly dark and distinctively marked with white blotches; spots and streaks, with a dark cruciate marking on the interorbit; a prominent white border around the body margin; snout tip lacks dark blotches; absence of the black pectoral-fin marking; it is similar with the much larger Atlantic species (Rhynchobatus luebberti) with well-developed rostral spines, but these spines are confined to the snout tip (vs. being more numerous and extending in paired rows along the rostral ridges nearly to the eyes) (Ref. 109575).
Body shape (shape guide): elongated.
A poorly known benthic species with restricted distribution, probably coastal. Males mature at ca. 71 cm TL, born at ca. 14 cm TL. Embryos with yolk sacs at 20.9-23.6 TL; juvenile male at 39.5 cm TL, adolescent at 64.2 cm TL and adult at size greater than 70.5 cm TL; immature females at 41.5 and 60.9 cm TL (Ref. 114953).
Жизненный цикл и брачное поведение
половая зрелость | размножение | нерест | икра | Плодовитость | личинки
Last, P.R., P.M. Kyne and L.J.V. Compagno, 2016. A new species of wedgefish Rhynchobatus cooki (Rhinopristoformes, Rhinidae) from the Indo-West Pacific. Zootaxa 4139(2):233-247. (Ref. 109575)
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Оценки, основанные на моделях
Индекс филогенетического разнообразия (ссылка
82804): PD
50 = 0.5024 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00372 (0.00166 - 0.00830), b=3.11 (2.91 - 3.31), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Трофический уровень (ссылка
69278): 3.4 ±0.6 se; based on size and trophs of closest relatives
Уязвимость рыбной ловли (Ref.
59153): Moderate to high vulnerability (52 of 100).
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