subclass

navigate by keyword : although amazing ammonites ammonoidea ammonoids ancient animals cephalopoda chambers class closely coleoids commonly creature cuttlefish dividing excellent extinct form forms fossil fossilized fossils found general genus geologic group helically index joint jurassic layer link living marine mollusc molluscs more nature nautiloids nautilus nonspiraled octopuses old oldest outer particular period periods phragmocone planispirals possible referred related rock separate septa shape shell shelled shells siphuncles some species specific spiral spiraled squid subclass sutures take time usually wall walls

Mites, numerous species of tiny arthropods, members of the mite and tick subclass Acari Royalty Free Stock Photo

A microscopic image of a copepod, a small crustacean belonging to the subclass Royalty Free Stock Photo

Magnified view of a copepod (subclass Copepoda), a small aquatic crustacean. Its Royalty Free Stock Photo

A wooden post in water is covered with numerous barnacles (subclass Cirripedia). Royalty Free Stock Photo

Parrots are classified in the animal kingdom, chordate tribe, bird class, aviation subclass and parrot family.nice colored Royalty Free Stock Photo

Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda.

A small springtail (subclass Collembola) is on a textured, green leaf. The insect has a Royalty Free Stock Photo

Leech on the glass. Bloodsucking animal. subclass of ringworms from the belt-type class. Royalty Free Stock Photo

Leech on the glass. Bloodsucking . subclass of ringworms from the belt-type class. Hirudotherapy Royalty Free Stock Photo

Oligochaeta a subclass of animals in the phylum Annelida, which is made up of many types of aquatic and terrestrial earthworms Royalty Free Stock Photo

Bird head-detail-Parrots are classified in the animal kingdom, chordate tribe, bird class, aviation subclass and parrot family Royalty Free Stock Photo

Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids octopuses, squid, and cuttlefish than they are to shelled nautiloids such as the living Nautilus species. Ammonites are excellent index fossils, and it is often possible to link the rock layer in which a particular species or genus is found to specific geologic time periods. Their fossil shells usually take the form of planispirals, although there were some helically spiraled and nonspiraled forms.