Irrawaddy Dolphin Taxonomy

January 01, 2022

The color of Irrawaddy dolphins is dark blue to dark gray ranging to pale gray with a pale ventral under side. Irrawaddy dolphins Orcaella brevirostris Owen in Gray 1866 aka Mekong or Mahakam River dolphin reach 2- 275 m in length.

Orcaella Brevirostris Society For Marine Mammalogy

These dolphins are characterized by their lack of a beak or rostum instead having a rounded head.

Irrawaddy dolphin taxonomy. Irrawaddy dolphins occur in marine waters of Cambodia along the coast of the Koh Kong. In the Sundarbans mangrove forest of Bangladesh - 451 dolphins. They range from northern Australia and New Guinea north to Palawan in the Philippines and west to the Bay of Bengal including freshwaters in the Ayerawaddy Mahakam and Mekong rivers and Songkhla and Chilka lakes.

Irrawaddy dolphins are included in CITES Appendix I in response. Irrawaddy Dolphin English Irrawady Dolphin English pesut. The first is that they lack a cardiac sphincter.

The Irrawaddy dolphin is one of only two members of the genus Orcaella. The entire current range of Irrawaddy dolphins in. Adults range from 2 to 275 m.

Irrawaddy dolphins inhabit coastal brackish and fresh waters of the tropical and subtropical Indo-Pacific. Taxonomy is constantly evolving as our knowledge grows and more. Taxonomy Irrawaddy dolphin skeleton specimen exhibited in Museo di storia naturale e del territorio dellUniversità di Pisa.

Irrawaddy dolphins are found in coastal areas in South and Southeast Asia and in three rivers. In the Mekong River - 125 dolphins. Irrawaddy dolphin Killer whale Minke whale Pilot whale Right whale Sei whale Sperm whale Spinner dolphin Spotted dolphin Striped dolphin Sounds Conservation Management.

One of the earliest recorded descriptions of the Irrawaddy dolphin was by Sir Richard Owen in 1866 based on a specimen found in 1852 in the harbour of Visakhapatnam on the east coast of India. The Mekong River Irrawaddy dolphins inhabit a 118-mile stretch of the river between Cambodia and Lao PDR and are scarcejust 92 individuals are estimated to still exist. Heinsohni rather than the Asian Irrawaddy dolphin O.

Dolphins that do have prominent rostums can have up to 130 teeth so perhaps the advantage of these teeth which may have become redundant was outweighed by the. They have a high rounded forehead and no beak. Orcaella fluminalis Anderson in Gray 1871.

They close the esophagus when food is not being swallowed. Verified - standards met. The Ayeyarwady Myanmar the Mahakam Indonesian Borneo and the Mekong.

Irrawaddy dolphinscan be confused with finless porpoises or dugongs in the parts of their range where these species overlap. Scant evidence indicates. According to the IUCN Red List the total population size of the Irrawaddy dolphin is unknown but there are estimates available for only a few portions of the range.

In coastal waters of Bangladesh - 5383 dolphins. There is some good news with new protection and research efforts. However an understanding of the metapopula-tion structure and patterns.

Irrawaddy dolphins have two anatomically unique features. Whales dolphins and porpoises Taxonomy is the scientific discipline used to define and group living things. In the Mahakam River Indonesia - 70 dolphins.

Orca brevirostris Owen in Gray 1866. The Irrawaddy dolphin is classified in the IUCN Red List as Vulnerable VU and five geographically isolated populations in Malampaya Sound Philippines Chilika Lake India Ayeyarwady River Myanmar Mahakam River Indonesia and Mekong River Lao PDR Cambodia and Vietnam are listed as Critically Endangered. In the Ayeyarwady River Myanmar - 58-72 dolphins.

Valid Data Quality Indicators. The esophagus is surrounded at the top and bottom by two muscular rings known as the upper esophageal sphincter and the lower esophageal sphincter. In Malampaya Sound Philippines - 77 dolphins.

The Irrawaddy dolphin population in Malampaya is the only one known of the species in the Philippines and the nearest area where another population of Irrawaddy dolphins is known to occur is northern Borneo some 550km to the south Smith et al 2005. When a clear view is obtained Irrawaddy dolphins are distinguishable because neither of the other species has a dorsal fin. Clarifying the distribution of Orcaella is an important first step inthe conservation and management forboth species.

Size This is a relatively small dolphin. The CSG has provided technical support to efforts to save the Mekong Rivers critically endangered Irrawaddy dolphins only about 85 remain in Cambodia and Laos.

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