graptolites's Usage Examples:

Graptolites had declined notably as compared with the Ordovician, and the trilobites passed their climax before the end of the period.

The departure of the Ordovician life from that of the Cambrian was perhaps most pronounced in the great development of the molluscs and crinoids (including cystoids), but corals were also abundant for the first time, and graptolites came into prominence.

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Here they contain numerous graptolites, including Tetragraptus, Dichograptus and Didymograptus.

The typical graptolites are, in the upper part, Dicellograptus anceps and D.

In the Maecuru, another northern affluent, graptolites of Ordovician age have been discovered, and Silurian fossils are said to have been found in the Maraca.

See the treatise of Delage and Herouard (Hydrozoa, [4]), and the article Graptolites.

Since no graptolites are known living, or, indeed, since palaeozoic times, the interpretation of their structure and affinities must of necessity be extremely conjectural, and it is by no means certain that they are Hydrozoa at all.

553; " Rhabdopleura and Graptolites," Neues Jahrb.

The suggestion has been made by Allmann and recently upheld by Schepotieff that Rhabdopleura is related to some of the Graptolites.