Question

Give morphological characters of Graptolites.

Answer 1

Graptolithina is a subclass of the classPterobranchia, the members of which are known as graptolites. These organisms are colonial animals known chiefly as fossils from the Middle Cambrian (Miaolingian, Wuliuan) through the Lower Carboniferous(Mississippian).[3] A possible early graptolite, Chaunograptus, is known from the Middle Cambrian.[4] One analysis suggests that the pterobranch Rhabdopleura represents extant graptolites.[2] Studies on the tubarium of fossil and living graptolites showed similarities in the basic fusellar construction and it is considered that the group most probably evolved from a Rhabdopleura-like ancestor.[5]

Answer 2

Answer:

General Characteristics • Graptolites belong to the phylum Hemichordata • Graptolites are the marine-colonial animals which growing three dimensionally. Some of them were attached to the sea bed (benthic) and many of them were floated freely(pelagic) in the sea. Bilaterally symmetrical and tentacled.