Name/Title
AmmoniteEntry/Object ID
96.01.026Description
Crystal System: Hexagonal System
Description: Phylum: Mollusca
Class:Cephalpoda
Genus: Ammonoidea
Common Name: Ammonite
Age: Unknown
Location: Unknown
Description: Partial, large specimen with some good detail and irredescense.
Physical Characteristics:
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural ?efa??p?da (kephalópoda); "head-feet"). These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishermen sometimes call them inkfish, referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology.
Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two, only distantly related, extant subclasses: Coleoidea, which includes octopuses, squid, and cuttlefish; and Nautiloidea, represented by Nautilus and Allonautilus. In the Coleoidea, the molluscan shell has been internalized or is absent, whereas in the Nautiloidea, the external shell remains. About 800 living species of cephalopods have been identified. Two important extinct taxa are the Ammonoidea (ammonites) and Belemnoidea (belemnites).
Family: Ammoniodea
Fracture: Conchoidal
Grain Size: Fine
Hardness: 3 Calcite
Kingdom: Animalia (Animals)
Luster: Vitreous
Class: Cephalopoda
Phylum: Mollusca
Rock Origin: Terrestrial
Rock Type: Sedimentary
Streak: whiteCollection
Fossil CollectionAcquisition
Accession
96.01Source or Donor
Crater Rock MuseumAcquisition Method
GiftDimensions
Width
3-1/4 inDepth
3 inLength
8 inLocation
Location
Shelf
CS-H-4Room
Curation StorageBuilding
Crater Rock MuseumDate
February 3, 2024
