Insentiraja subtilispinosa
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Insentiraja subtilispinosa |
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| Scientific name | ||||||||||||
| Insentiraja subtilispinosa | ||||||||||||
| ( Stehmann , 1989) |
Insentiraja subtilispinosa is a very small ray (Batoidea) from the family of the soft-nosed rays, which lives primarily in great sea depths. This type of ray lays eggs .
features
A small ray with a heart-shaped body that is approximately 1.1 times wider than it is long. It has a very long and thin tail that tapers backwards, two dorsal fins and a long caudal fin lobe. Its back is densely provided with small, fine spines. Small thorns sit in front of the eye sockets, otherwise the species has no thorns. The ray is a maximum of 57 centimeters long and is uniformly dark brown all over its body. At a size of approx. 40 centimeters, female specimens are sexually mature, while males are more than 45 cm. The teeth are small cusps that are angled backwards and of different sizes. Very little is known about the behavior of the species.
distribution
The distribution area extends from the eastern Indian Ocean to the western central Pacific . The area is not clearly defined, but it is most common from northwest Australia to Indonesia to the northern Philippines . Presumably it is more widespread across the Malay Archipelago than previously thought.
habitat
The species is most frequently found on the continental shelf near the bottom at a depth of 900 to 1100 meters. This ray migrates maximally between sea depths of 320 to 1460 meters.
Danger
Insentiraja subtilispinosa is caught as by-catch in trawls but has no commercial value. It can find refuge from the nets in deeper waters and is therefore classified as not endangered by the International Union for Conservation of Nature (IUCN) . However, should trawling be intensified, this assessment may need to be re-examined.
supporting documents
- ↑ a b David A. Ebert: DEEP-SEA CARTILAGINOUS FISHES OF THE INDIAN OCEAN Volume 2 Batoids and Chimaeras ; Food and agriculture organization of the united nations, Rome 2014, ISBN 978-92-5-108453-3 ( // PDF ). Pp. 43-45.
- ↑ Insentiraja subtilispinosa in the IUCN 2017-2 Red List of Threatened Species . Posted by: Huveneers, C., Stehmann, MFW & Last, PR, 2015-05-09.
Web links
- Insentiraja subtilispinosa on Fishbase.org (English)