A form genus - that is, a set of species that have a common shape rather than a common ancestry. These form genera are still usefUl for identifications in the field and at a preliminary level. Climacograptids have box-like thecae and are always biserial. They are typically 2-6 cm long.
Monograptid fauna Silurian
A spirally coiled graptoloid with unusual thecae, each with a spine at the aperture. These spines are capable of developing into branches, each made of the same type of thecae and capable of branching again. These species may have filled a niche left vacant by the extinction of large, many branched, horizontally arranged dichograptids. They are usually 5-60 cm
Was this article helpful?
This is common knowledge that disaster is everywhere. Its in the streets, its inside your campuses, and it can even be found inside your home. The question is not whether we are safe because no one is really THAT secure anymore but whether we can do something to lessen the odds of ever becoming a victim.