To this subclass may be referred all known birds except Archaeopteryx.
Difficulty of entitling a subclass corresponding to every combination.
This subclass contains some of the most remarkable of the seaweeds.
This superorder is equivalent to the subclass Azygostei of Hay.
The subclass c forms an exogamous unit with e, and the subclass d with f.
This subclass, like the previous one, contains only a single order, viz.
This is the best defined of the orders of sharks, and should perhaps rank rather as a subclass, as the Holocephali.
There remains the fourth subclass—Dipnoi or Dipneusti, the lungfishes.
The Iulid are cylindrical insects and occur in moist places, as do most of the representatives of this subclass.
Embryo with a pair of opposite cotyledons, or in subclass II.
subclass sub·class (sŭb'klās')
A taxonomic category of ranking between a class and an order.