Monograptus
Encyclopedia
Monograptus is a genus of the Order Graptoloidea. This particular genus is the last stage of the graptoloid
evolution before its extinction in the early Devonian
. Characteristics of monograptus include: One uniserial stipe, with very elaborate theca
e. This particular genus contains large number of graptolite species and may not be monophyletic.
Graptolite
Graptolithina is a class in the animal phylum Hemichordata, the members of which are known as Graptolites. Graptolites are fossil colonial animals known chiefly from the Upper Cambrian through the Lower Carboniferous...
evolution before its extinction in the early Devonian
Devonian
The Devonian is a geologic period and system of the Paleozoic Era spanning from the end of the Silurian Period, about 416.0 ± 2.8 Mya , to the beginning of the Carboniferous Period, about 359.2 ± 2.5 Mya...
. Characteristics of monograptus include: One uniserial stipe, with very elaborate theca
Theca
A theca refers to any case, covering, or sheath.In botany, the theca of an angiosperm consists a pair of microsporangia that are adjacent to each other and share a common area of dehiscence called the stomium. Any part of a microsporophyll that bears microsporangia is called an anther. Most...
e. This particular genus contains large number of graptolite species and may not be monophyletic.
