The Dentaliida is one of the two orders of scaphopodmollusks. Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Subregnum Bilateria Acoelomorpha Orthonectida Rhombozoa Myxozoa Superphylum Deuterostomia Chordata (vertebrates, etc. ... Classes Caudofoveata Aplacophora Polyplacophora - Chitons Monoplacophora Bivalvia - Bivalves Scaphopoda - Tusk shells Gastropoda - Snails and Slugs Cephalopoda - Squids, Octopuses, etc. ... Orders Dentaliida Gadilida The tusk shells are a class Scaphopoda of marine mollusks distinguished by curved tubular shells open at both ends, resembling a elephants tusk (thus the name). ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... Order is the opposite of anarchy and chaos. ... Classes Caudofoveata Aplacophora Polyplacophora - Chitons Monoplacophora Bivalvia - Bivalves Scaphopoda - Tusk shells Gastropoda - Snails and Slugs Cephalopoda - Squids, Octopuses, etc. ...
This division is based primarily on the constriction of the anterior aperture in the Gadilida and the shape of the central tooth of the radula (Emerson, 1962), although there are also several shell, radular and anatomical differences between the two groups, as enumerated by Scarabino (1979) and Steiner (1992b).
The Dentaliida precede the Gadilida in the fossil record with the appearance of Rhytiodentalium kentuckyensis in the Ordovician; the first gadilid fossils date from the Permian (Pojeta and Runnegar, 1985).
Chistikov presented a classification scheme of the Dentaliida which incorporated radular and soft-part anatomical characters from 10 of the 17 dentaliid genera.
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