Skip to main content


Cladoselache species
Today's Shark is the largest one that we have talked about so far, and it is also the oldest. Cladoselache is the name of a genus containing eight different Shark species, all of which lived during the Devonian Period, around 370 million years ago.

Sharks have been around for hundreds of millions of years, and the Cladoselache Sharks are some of the best known of the ancient species. This is because many of their fossils were very well preserved in a formation near Lake Erie. Some of these fossils are so detailed that we know their stomach contents!

These extinct sea creatures are interesting not only because they lived a very, very long time ago, but also because they had some interesting anatomical features. For one, they almost completely lacked scales. The only scales it had were found on the tips of the fins, and around the mouth and eyes. Secondly, these Sharks lacked "claspers"-- the reproductive organs that are found not only in modern sharks, but in many other ancient species as well. Scientists are still unsure how they specifically reproduced. Finally, the Cladoselache Sharks had smooth, blunt teeth. Rather than tear apart their prey, they grasped it and swallowed it whole.

Cladoselache Sharks were probably very fast and agile, based on their body shape, dorsal fins, and large tail fin. They were high speed predators who also needed to be quick in order to avoid becoming prey themselves. Sharks weren't the only large predators swimming the seas-- this was the time of the 30ft Dunkleosteus as well!

There are no close relatives of the Cladoselache Sharks left today. All other genera within the family are extinct, and that family was the only one within the entire order.

Status : Extinct for around 370 million years
Location : North America
Size : Length up to 6ft (1.8m)
Classification : Phylum : Chordata -- Class : Chondrichthyes -- Order : †Cladoselachiformes
Family : †Cladoselachidae -- Genus : †Cladoselache


Popular posts from this blog

Bornean Orangutan

The Bornean Orangutan is one of two extant Orangutan species in the world. It is the third largest primate (after Gorillas) and is the largest primarily tree-dwelling animal in the world. Males are substantially larger than females, and average at around 165lbs. Bornean Orangutans are largely solitary. A handful might live within a small range but they will seldom interact with one another. Males and females only meet up to breed, which happens only once every several years. A young Orangutan will stay with it's mother for about five years, and the females tend to go about eight years between births. That is the longest interim period of any animal! Sadly, the Bornean Orangutans are in a lot of trouble. They need large forests in order to thrive, and deforestation and habitat degradation has left many homeless. They are also hunted for meat and for traditional medicines. Conservation areas are being established to help these guys in the wild, and it is believed that there are a


For anyone who was counting, yesterday was our birthday-- four years! Four years filled with animals from A to Z, more than 1,100 of them! I can't thank my readers enough, it's been wonderful! And in celebration of that milestone... I'm taking a break. Hopefully not forever, but for a little bit at least. In the mean time I plan on getting a new layout out, along with some updates to some of the older articles. I'll post updates here and on the Facebook page, I'm also brainstorming some new animal-related projects, so keep an eye out! Thanks again for four awesome years!


The Binturong ( Arctictis binturong ) also has an equally awesome alternate common name, the Bearcat! However, it really isn't much of a bear OR a cat. While it is true that it is part of the Feliforma suborder, it is not a member of family Felidae. Binturongs are a part of their own family, Viverridae, which is shared with Civets, Linsangs, and Genets. There are six subspecies of Binturong, all of which have slight differences based upon location and habitat. Binturongs range in body size from 60-100cm in length, (not including their tail which has roughly the same length) and weigh between 20 and 30lbs. Binturongs are nocturnal animals native to the rain forests of South East Asia. The species range spans through several countries including China, Malaysia, Indonesia and the Philippines. They are tree dwelling mammals, and have fully prehensile tails that basically double their body length and can be used to cling to the trees or to grasp food. Binturongs are phe