Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

A Late Miocene potential neobalaenine mandible from Argentina sheds light on the origins of the living pygmy right whale

100%

Buono M. R., Dozo M. T., Marx F. G., Fordyce R. E.

Acta Palaeontologica Polonica

2014

tom 59

nr 4

The origins and evolutionary relationships of the pygmy right whale (Caperea marginata), the only living member of the Neobalaeninae, have been the subject of a long-standing debate. This phylogenetic uncertainty is compounded by a limited neobalaenine fossil record. Here, we report a Late Miocene mysticete mandible from Patagonia, Argentina, and provisionally refer it to Neobalaeninae, gen. et sp. indet. The new material represents only the third report of a fossil neobalaenine, and the first fossil occurrence of this lineage in the southwestern Atlantic. It is also the oldest specimen so far reported, thus corroborating the idea of an early divergence time for neobalaenines.

Like phoenix from the ashes: How modern baleen whales arose from a fossil “dark age”

100%

Marx F. G., Fitzgerald E. M. G., Fordyce R. E.

Acta Palaeontologica Polonica

2019

tom 64

nr 2

The evolution of baleen whales (Mysticeti), the largest animals on Earth, was punctuated by a pivotal turnover event. Following their emergence around 36 million years (Ma), mysticetes diversified into a disparate range of toothed and toothless species until 23 Ma, but then nearly vanished from the global fossil record for the next five million years. Following this early Miocene “dark age”, toothless mysticetes spectacularly reappeared around 18–17 Ma, whereas toothed mysticetes had gone entirely extinct. Here, we suggest that this turnover event reflects a change in mysticete habitat occupancy. Using the well-sampled record of Australasia as a case study, we show that Oligocene pre-“dark age” mysticetes formed distinct coastal and offshore assemblages, dominated by small (2–4 m), ecologically disparate toothed species, and larger (5–6 m) toothless filter feeders, respectively. Environmental change around the Oligocene–Miocene boundary led to the decline of the endemic coastal assemblages, leaving nearshore deposits virtually devoid of mysticetes. Filter feeders persisted offshore and subsequently re-invaded coastal habitats during the mid-Miocene Climatic Optimum, thus establishing the modern, cosmopolitan mysticete fauna.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Fordyce R. E.

2 Marx F. G.

1 Buono M. R.

1 Dozo M. T.

1 Fitzgerald E. M. G.

1 2019

1 2014

Wyniki wyszukiwania

A Late Miocene potential neobalaenine mandible from Argentina sheds light on the origins of the living pygmy right whale

Like phoenix from the ashes: How modern baleen whales arose from a fossil “dark age”