Pita skate
| Pita skate (new status of this species see on the IUCN Red List of Threatened Species - 2016 - needs updating) | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Order: | Rajiformes |
| Family: | Rajidae |
| Genus: | Okamejei |
| Species: | O. pita |
| Binomial name | |
| Okamejei pita R. Fricke & Al-Hassan, 1995 | |
 | |
| The pita skate has only been described from one location, in the northern Persian Gulf off the coast of Iraq, near the borders with Kuwait and Iran. | |
| Synonyms | |
|
Raja (Okamejei) pita Fricke & Al-Hassan, 1995 | |
Okamejei pita also known as the Pita skate is a medium-sized skate in the genus Okamejei. The holotype and only known specimen was found in the northern Persian Gulf, in Iraqi waters.[1] It was collected at a depth of less than 15 m (49 ft).[2]
It is around 46 cm (18 in) in length, and the coloration pattern (described from a specimen preserved in alcohol) is light brown dorsal body with irregular darker brown blotches, and a light brown ventral body. The tail is slightly darker than the body. The name derives from the coloration pattern resembling pita bread.[2]
Description
The species is known from only one female specimen, so variation and sex differences are not known.[1] The holotype specimen is 461.1 mm (18.15 in) in total length, about half being body and half tail. The disc is 549 mm (21.6 in) at the widest point.[2]
The disc forms an approximate quadrangle. The dorsal surface and basal portions of pelvic fins have brown spots on a light brown background. Three brown streaks are noted on the posterior distal pectoral fins. Ventral surface is pale brown, with no variation noted.[2]
Dorsal areas are covered in dermal denticles except for two symmetric patches on the disc and along the posterior margin of the pectoral and pelvic fins. Ventral areas smooth except for a few patches of denticles of varying density. The dorsal surface has a row of 31 thorns along the midline, and a parallel row of three on either side of the midline approximately mid-disc. It has additional thorns around the eyes and snout. The tail has an additional 29 thorns on the midline, and other thorns in regular and irregular rows.
Biology and life history
Information is very limited for this species.[1] It likely lives in muddy bottoms, where it was collected, but the distribution and specifics of habitat preferences are unknown. The eggs of this species are unknown, but like other skates, it is likely oviparous, laying eggs in pairs in open waters, and not guarding the eggs.[3]
O. pita was originally classified into the genus Raja and subgenus Raja (Okamejei). This subgenus was reclassified into genus in 1999.[4] The taxonomic validity of this species was reconfirmed by Compangno in 2007.[1] This species is placed as incertae sedis in the genus Raja.[5]
Status
Despite being known from only one specimen, the species is classified as critically endangered by the IUCN.[1] It is not the target of any fishery,[3] but it may be unrecognized bycatch in several other fisheries, including those using longlines, fish traps, stake nets, and trawls.[1][6] Like other elasmobrachs, this species is not likely consumed by the Shia population who fish in the area.[1]
In addition to fishing threats, pollution and loss of water quality are possible concerns for this species. Threats include hydrocarbons and biotic threats.[1]
Multiple fisheries surveys of this region failed to find this species,[7] which is taken to indicate this species is rare. No surveys were conducted after 1980, due to the start of the Iran-Iraq war and subsequent military conflicts.[1]
References
- 1 2 3 4 5 6 7 8 9 10 Moore, A. & Jawad, L.A. (2009). "Okamejei pita". IUCN Red List of Threatened Species. Version 3.1 (3.1). International Union for Conservation of Nature.
- 1 2 3 4 Fricke, R. & Al-Hassan, L.A.J. (1995). "Raja pita, a new species of skate from the Arabian/Persian Gulf (Elasmobranchii:Rajiformes)". Stuttgarter Beitrage zur Naturkunde. 529: 1–8.
- 1 2 Froese, Rainer and Pauly, Daniel, eds. (2015). "Okamejei pita" in FishBase. February 2015 version.
- ↑ Compagno, L., "Checklist of living elasmobranches", in W.C. Hamlett, Sharks, skates and rays: the biology of elasmobranchs fishes, pp. 471–498
- ↑ Weigmann, S., Stehmann, M.F.W. & Thiel, R. (2015): Okamejei ornata n. sp., a new deep-water skate (Elasmobranchii, Rajidae) from the northwestern Indian Ocean off Socotra Islands. Deep-Sea Research Part II, 115: 18-29.
- ↑ Jawad, L.A. (2006). "Fishing Gear and Methods of the Lower Mesopotamian Plain with Reference to Fishing Management" (PDF). Marina Mesopotamica. 1: 1–37.
- ↑ Blegvad, H. & Løppenthin, B. (1944). Fishes of the Iranian Gulf. Einar Munksgaard, Copenhagen, Denmark.