Wyniki wyszukiwania

1

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

The oldest fossil record of the extant penguin genus Spheniscus - a new species from the Miocene of Peru

100%

Gohlich U. B.

Acta Palaeontologica Polonica

|

2007

|

tom 52

|

nr 2

Described here is a partial postcranial skeleton and additional disarticulated but associated bones of the new fossil penguin Spheniscus muizonisp. nov. from the latest middle/earliest late Miocene (11–13 Ma) locality of Cerro la Bruja in the Pisco Formation, Peru. This fossil species can be attributed to the extant genus Spheniscus by postcranial morphology and is the oldest known record of this genus. Spheniscus muizonisp. nov. is about the size of the extant Jackass and Magellanic penguins (Spheniscus demersus and Spheniscus magellanicus). Beside Spheniscus urbinai and Spheniscus megaramphus it is the third species of Spheniscus represented in the Pisco Formation. This study contains morphological comparisons with Tertiary penguins of South America and with most of the extant penguin species.

2

A new Miocene penguin from Patagonia and its phylogenetic relationships

100%

Acosta H. C., Tambussi C., Donato M., Cozzuol M.

Acta Palaeontologica Polonica

|

2007

|

tom 52

|

nr 2

We describe a new medium−sized penguin, Madrynornis mirandus gen. et sp. nov., from the early late Miocene Puerto Madryn Formation, Chubut Province, Argentina. Although it is evident that extant and fossil penguins form a remarkably homogeneous family of birds, Spheniscidae, their within−group phylogenetic relationships are less obvious. In order to identify the phylogenetic position of the new taxon, we conducted a phylogenetic analysis using 44 osteological characters sampled from 14 representative species of all living genera and five fossil species of Spheniscidae. The family is clearly monophyletic and Madrynornis mirandus is closely related to living taxa. Our phylogenetic interpretation is congruent with biostratigraphic data, with Paraptenodytes from the early Miocene (about 20 Ma) located at the base of the Spheniscidae. Classically, two basic tarsometatarsal types were recognized (one for pre−Miocene and the other for the post−Miocene penguins) based on the pattern of the proximal foramina and the hypotarsus. Madrynornis mirandus exhibits an arrangement of the proximal foramina and a degree of metatarsals fusion similar to that in the living forms, although its elongation index (total length/proximal width) is reminiscent of the extinct Paraptenodytes(a penguin historically recognized as a pre−Miocene form, coming from the early Miocene of Argentina). Madrynornis reveals that the two basic tarsometatarsal types co−existed among Miocene penguins.

3

Diet of the Adelie penguin during three consecutive chick rearing periods at Laurie Island

70%

Libertelli M. M., Coria N., Marateo G.

Polish Polar Research

|

2003

|

tom 24

|

nr 2

4

Pingwiny z Zatoki Algoa

70%

Kaczmarski L.

Przyroda Polska

|

1992

|

nr 12

14

5

Ptasia wyspa

50%

Karczmarski L.

Przyroda Polska

|

1993

|

nr 01

13

6

Pingwiny.

50%

Krzeptowski M.

Poznaj Świat

|

1996

|

nr 12

77-79

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Przyroda Polska

1 Polish Polar Research

1 Poznaj Świat

1 Acosta H. C.

1 Coria N.

1 Cozzuol M.

1 Donato M.

1 Gohlich U. B.

1 Kaczmarski L.

1 Karczmarski L.

1 Krzeptowski M.

1 Libertelli M. M.

1 Marateo G.

1 Tambussi C.

2 2007

1 2003

1 1996

1 1993

1 1992

The oldest fossil record of the extant penguin genus Spheniscus - a new species from the Miocene of Peru

A new Miocene penguin from Patagonia and its phylogenetic relationships

Diet of the Adelie penguin during three consecutive chick rearing periods at Laurie Island

Pingwiny z Zatoki Algoa

Ptasia wyspa

Pingwiny.