1560 Gesner Dolphin as sea mammals
Numéro d’image : 11733470
| Woodcut by Gesner,following Belon 1551. Gesner "Icones Animalium" publ. Christof Froschover,Zurich,1560. Gesner,followed Rondelet and Belon in grouping marine mammals with fish based on habitat. But he (and Rondelet) that unlike fishes with scales the dolphins have hearts with two divided chambers and foetus were in a placenta like land viviparous quadrupeds. Based on this and his descriptions of other internal organs,he considered marine mammals to be a type of aquatic quadruped. But in an age before clear taxonomy,it was by their life in the water that he chose to define them. The realisation that cetaceans were seperate from the fishes and should be grouped with the viviparous qudrapeds had to wait two centuries for Linnaeus,1758. He coined the term cetacea and put them with the mammals based on breathing by lungs,hollow ears,internal fertilization,and production of milk | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Stewart, Paul D. |
| Taille de l’image : | 3421 px × 5108 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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