Monograptus

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 the genus include: One uniserial stipe, with very elaborate thecae. This particular genus contains large number of graptolite species and may not be monophyletic. == B...
Found on http://en.wikipedia.org/wiki/Monograptus

Monograptus

extinct genus of graptolites (small, aquatic colonial animals related to primitive chordates) found as fossils in Silurian marine rocks (formed 438 ...
Found on http://www.britannica.com/eb/a-z/m/113
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