Orthoceras was a straight shelled nautiloid that lived during the Paleozoic Era. The name means straight horn, ortho=straight ceras= horn. It is this long conical shell that is commonly preserved as a fossil.
Meal Time
All the living relatives of orthoceras, squid, octopus, cuttlefish, and nautilus are predators, and we can assume that orthoceras was also a hunter of the Paleozoic seas, possibly having trilobites for breakfast!
Size
There are huge variations in the size of these fossils. The have been found as small as a centimeter to more than 14 feet long!
When Did They Live?
The fossils of this group are found from the early Ordovician Period up to the Triassic period. This time covers about 300 million years. They were most prolific during the Ordovician and Devonian Periods.
The soft body of the orthoceras lived in the last open-ended segment at the large end of the conical shell. As the body grew it added on to the shell. Eventually a dividing wall, called the septa grew to separate the old “home chamber” from the new one.
The siphuncle is a tube that runs the entire length of the shell, through each of the chambers. This tube could serve as a bouyancy device allowing the animal to rise and lower itself to different depths.
Orthoceras fossils have been found in North America, Europe, Africa, Asia, and Australia
Orthoceras ชื่อหมายถึงฮอร์นตรงออร์โธ Orthoceras was a straight shelled nautiloid that lived during the Paleozoic Era. The name means straight horn, ortho=straight ceras= horn. It is this long conical shell that is commonly preserved as a fossil.
Meal Time
All the living relatives of orthoceras, squid, octopus, cuttlefish, and nautilus are predators, and we can assume that orthoceras was also a hunter of the Paleozoic seas, possibly having trilobites for breakfast!
Size
There are huge variations in the size of these fossils. The have been found as small as a centimeter to more than 14 feet long!
When Did They Live?
The fossils of this group are found from the early Ordovician Period up to the Triassic period. This time covers about 300 million years. They were most prolific during the Ordovician and Devonian Periods.
The soft body of the orthoceras lived in the last open-ended segment at the large end of the conical shell. As the body grew it added on to the shell. Eventually a dividing wall, called the septa grew to separate the old “home chamber” from the new one.
The siphuncle is a tube that runs the entire length of the shell, through each of the chambers. This tube could serve as a bouyancy device allowing the animal to rise and lower itself to different depths.
Orthoceras fossils have been found in North America, Europe, Africa, Asia, and Australia
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