Elasmobranchii (sharks and rays) >
Myliobatiformes (Stingrays) >
Myliobatidae (Eagle and manta rays)
Etymology: Myliobatis: Greek, mylo = mill + Greek, + Greek, batis,-idos = a ray (Raja sp.) (Ref. 45335).
Eponymy: Dr Ronald Hamlyn-Harris (1874–1953) was an English-born entomologist. [...] (Ref. 128868), visit book page.
More on author: Ogilby.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; benthopelagic; depth range 200 - ? m (Ref. 6871). Deep-water; 17°S - 26°S
Indo-West Pacific: patchy distribution, Austalia, Indonesia, the Philippines, Taiwan and Japan.
Length at first maturity / Size / Weight / Age
Maturity: Lm ?, range 65 - ? cm
Max length : 48.0 cm WD male/unsexed; (Ref. 6871)
Vertebrae: 114 - 119. This medium-sized Myliobatis species (attaining at least 114.2 cm DW) is distinguished by the following set of characters: dorsal surface uniformly purplish brown to greenish brown, without dark spots or blotches; tail with a distinct, low ventral skin fold; stinging spine(s) are relatively long (longest spine 13.1-15.9% DW); adult males with interorbital space moderately concave; anterior margins of pectoral fin is straight to slightly convex; cranial fontanelle (visible in dorsal view without dissection) is relatively wide with slightly convex lateral margins; claspers of adult males 5.5-5.7% DW; predorsal length 63.6-68.6% DW; each jaw with 7 rows of teeth, with a broad median row flanked by three smaller rows on each side; pectoral-fin radials 85-92 (excluding rostral propterygial radials anterior of eyes); total vertebral centra (including synarcual) 114-119; males mature at about 65.0 cm DW (Ref. 132213).
Cross section: flattened.
Common inshore and offshore, demersal in intertidal habitats to depths of at least 220 m (Ref. 58048); also in coral reefs (Ref. 58534). Diet unknown, but presumably consists primarily of bivalves and other bottom-dwelling invertebrates. Caught occasionally by inshore, demersal longline fisheries. Utilized for its meat and cartilage (Ref. 58048). Ovoviviparous (Ref. 50449).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
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).
White, W.T., J. Kawauchi, S. Corrigan, E. Rochel and G.J.P. Naylor, 2015. Redescription of the eagle rays Myliobatis hamlyni Ogilby, 1911 and M. tobijei Bleeker, 1854 (Myliobatiformes: Myliobatidae) from the east Indo-West Pacific. Zootaxa 3948(3):521-548. (Ref. 132213)
IUCN Red List Status (Ref. 130435: Version 2025-1)
Threat to humans
Harmless
Human uses
Fisheries: commercial
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5002 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00119 - 0.01269), b=3.08 (2.83 - 3.33), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trophic level (Ref.
69278): 3.4 ±0.4 se; based on size and trophs of closest relatives
Resilience (Ref.
120179): Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (83 of 100).
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