Phocoena dioptrica - Spectacled porpoise

Phocoena dioptrica - Spectacled porpoise

FOCENA FROM THE GLASSES
(Neophocaena dioptrica)


Note 1

SCIENTIFIC CLASSIFICATION

Kingdom

:

Animalia

Phylum

:

Chordata

Subphylum

:

Vertebrata

Class

:

Mammalia

Order

:

Cetacea

Suborder

:

Odontoceti

Family

:

Phocoenidae

Kind

:

Phocoena

Species

:

Phocoena dioptrica

Common name

: spectacled porpoise

GENERAL DATA

  • Body length: female 1.25 m; male 2.25 m
  • Weight: 55 - 80 kg
  • Lifespan: --
  • Sexual maturity:--

HABITAT AND GEOGRAPHICAL DISTRIBUTION

There Phocoena dioptrica, known as spectacled porpoise belongs to the family Phocoenidae and it is a species that lives only in the oceans in the southern hemisphere. It is usually found off the southeastern coast of South America (from Uruguay, Argentina to Cape Horn) and also near the Falkland Islands and South Georgia Islands. It has also been seen in the Pacific Ocean (New Zealand , Macquarie Island and Auckland Islands) and in the Indian Ocean (Heard Island and Kerguelen Islands). In practice, it is thought that the spectacled porpoise is a circumpolar species of the sub-Antarctic areas (with water at temperatures between 1-10 ° C) and that lives in the open ocean.

This cetacean is poorly known so much so that until the 1970s only 10 specimens had been sighted, therefore very little is known about its life.


Note 2

PHYSICAL CHARACTERISTICS

The spectacled porpoise has a blue-gray body in the dorsal part and white in the ventral one with a clear demarcation between the two regions (the color does not fade as in the other species) so that the caudal fin is black in the dorsal part and white in the ventral one.

There is a gray line that extends from the edge of the mouth to the pectoral fins, which is dark in color. The lips are black as well as the eyes are circled in black (hence the name Spectacled porpoise). The dorsal fin is also black, large, triangular in shape and larger in males than in females; the pectoral fins are white, small and rounded and far forward.

It has the typical snout of porpoises, devoid of rostrum (we don't find the classic beak typical of dolphins) and flattened.

CHARACTER, BEHAVIOR AND SOCIAL LIFE

It has been observed that it is a solitary species, at most it lives in groups formed by two or three individuals.

COMMUNICATION AND PERCEPTION

There is no information of any kind on this subject but they are supposed to communicate like all other porpoises.

EATING HABITS

On the basis of the teeth it is thought that the feeding of the porpoise with glasses is that typical of the other species belonging to this family: small fish and squid.

REPRODUCTION AND GROWTH OF THE SMALL

There is no information about the reproductive system of this species.

STATE OF THE POPULATION

There Phocoena dioptrica is classified in the IUNC Red list (2009.1) among animals with insufficient data, DATA DEFICIENT (DD) for which therefore it is not possible to make any type of evaluation.

This cetacean is hunted off the coast of Chile to be used as bait for catching crabs and many specimens are trapped in fishing nets (the effects of this fishing on the population are not known).

The species is found in Appendix II of CITES (Convention on International Trade in Endangered Species of Flora and Fauna, known as the "Washington Convention") which includes species not necessarily threatened with extinction but whose trade must be held under observation to avoid exploitation incompatible with the survival of the species.

Note

  1. Image taken from the website www.royanddarla.com;
  2. image not subject to copyright and licensed under a Creative Commons license.

Video: All Porpoises Species - Species List