ANIMALS – MAMMALS – CETACEANS – LA PLATA DOLPHIN (PONTOPORIA BLAINVILLEI)

Animals - Mammals - Cetaceans

La Plata dolphin (Pontoporia blainvillei)

Scientific Classification:

Kingdom : Animalia
Phylum : Chordata
Class : Mammalia
Subclass : Eutheria
Order : Cetacea
Suborder : Odontoceti
Superfamily : Inioidea
Family : Pontoporiidae
Genus : Pontoporia
Species : P. Blainvillei

Description:

The La Plata dolphin or Franciscana (Pontoporia blainvillei) is found in coastal Atlantic waters of southeastern South America. It is a member of the river dolphin group and the only one that actually lives in the ocean and saltwater estuaries, rather than inhabiting exclusively freshwater systems.

The La Plata dolphin is the only species in its genus, and is often placed in its own family, the Pontoporiidae. It was first described by Paul Gervais and Alcide d'Orbigny in 1844 (the species epithet blainvillei commemorates the French zoologist Henri Marie Ducrotay de Blainville).

The La Plata dolphin is also widely known as the Franciscana - the Argentine and Uruguayan name that has been adopted internationally. Other common names are the toninha (the Brazilian name) and cachimbo.

The La Plata dolphin has the longest beak (as a proportion of body size) of any cetacean — as much as 15% in older adults. Males grow to 1.6 m (5 ft, 3 in) and females to 1.8 m (5 ft, 10 in). The body is a greyish brown colour, with a lighter underside. The flippers are also very large in comparison with body size and are very broad, but narrow on joining the body, so are almost triangular in shape. The trailing edges are serrated. The crescent-shaped blowhole lies just in front of a crease in the neck, giving the impression that dolphin forever has its head cricked upwards. The dorsal fin has a long base and a rounded tip.

The La Plata dolphin weighs up to 50 kg (110 lb), and lives for up to 20 years. The gestation period is around 10–11 months and juveniles take just a few years to mature. Females may be giving birth by the age of five.

Binomial Name:

Name : Pontoporia blainvillei
Taxonomist : Paul Gervais (Paris - France) and Alcide d'Orbigny (Couëron - France)
Year : 1844
Subspecies : None or not data available
Synonyms : None or not data available

Conservation Status by IUCN:

Status : Vulnerable

A Vulnerable species is one which has been categorised by the International Union for Conservation of Nature as likely to become endangered unless the circumstances threatening its survival and reproduction improve.

Vulnerability is mainly caused by habitat loss or destruction. Vulnerable habitat or species are monitored and can become increasingly threatened. Some species listed as "vulnerable" may be common in captivity.

Philatelic Issues

2015 - Uruguay - Stamp 3 of 4, from Spring Series

Issue information:

Country: Uruguay
Date: August 31st, 2012
Printed: 15.000 Copies
Type: Stamp from Series of 4 Stamps
Value: UYP 12

Stamp: Rectangular
Size: 39 mm. x 27 mm.
Perforation: Circular
Gum: Water Activated