Phylum Classification Overview

Study Notes

Phylum Classification Overview

Phylum Porifera includes three classes: Calcarea, Hexactinellida, and Demospongiae.
Phylum Cnidaria comprises Hydrozoa, Schyphozoa, and Anthozoa.
Phylum Cnetophora is represented by Comb Jellies; lacks distinct classes.
Phylum Platyhelminthes contains three classes: Turbellaria, Trematoda, and Cestoda.
Phylum Rotifera is solely represented by Rotifers without sub-classes.
Phylum Nematoda consists of Round Worms; no classes are specified.
Phylum Nemertea covers Ribbon Worms, known for their proboscis; no classes.
Phylum Mollusca includes five classes: Polyplacophora, Cephalopoda, Bivalvia, Gastropoda, and Scaphopoda.
Phylum Annelida features segmented worms divided into Hirudinea, Oligochaeta, and Polychaeta.
Phylum Onychophora represents Peripatus; does not have designated classes.
Phylum Tardigrada consists of water bears; lacks class distinctions.
Phylum Arthropoda is diverse with subphyla: Trilobitomorpha, Hexapoda, Chelicerata, Crustacea, and Myriapoda.
Phylum Brachiopoda includes Lamp Shells; lacks classes.
Phylum Echinodermata features five classes: Asteroidea, Crinoidea, Holothuroida, Ophiuroidea, and Echinoidea.
Phylum Hemichordata covers Acorn worms without classification into classes.
Phylum Chordata includes three subphyla: Urochordata, Cephalochordata, and Craniata.

Class Specific Details

Planaria belong to class Turbellaria.
Flukes are classified under Trematoda.
Tapeworms fall within Cestoda.
Chitons are part of Polyplacophora.
Snails, whelks, and slugs are categorized as Gastropoda.
Scallops, oysters, mussels, and clams belong to Bivalvia.
Toothshells are in the class Scaphopoda.
Octopus, squid, and chambered nautilus are identified as Cephalopoda.
Earthworms correspond to the Oligochaeta class.
Marine or fan worms belong to Polychaeta.
Leeches are classified as Hirudinea.

Invertebrate Groups

Horseshoe crabs belong to Merostomata.
Sea spiders are classified under Pycnogonida.
Spiders, scorpions, ticks, mites, and harvestmen are all part of the class Arachnida.
Centipedes are categorized as Chilopoda.
Millipedes belong to the class Diplopoda.
Sea stars are identified with the class Asteroidea.
Brittle stars fall within Ophiuroidea.
Urchins and sand dollars belong to Echinoidea.
Sea cucumbers are classified as Holothuroidea.
Sea lilies and feather stars belong to Crinoidea.

Pisces and Tetrapoda Classifications

Classes within Grouping Pisces include: Myxini, Cephalaspidomorphi, Placodermi, Chondrichthyes, and Osteichthyes.
Hagfish correspond to class Myxini.
Lampreys are classified as Cephalaspidomorphi.
Armored fish belong to the class Placodermi.
Cartilaginous fish are included in Chondrichthyes.
Bony fish are classified as Osteichthyes.

Tetrapoda Class Orders

Classes in Grouping Tetrapoda consist of Amphibia, Reptilia, Aves, and Mammalia.
Orders in class Amphibia are Anura (frogs), Urodela (salamanders and newts), and Apoda (caecilians).
Orders in class Reptilia include Chelonia (turtles), Rhychocephalia (tuatara), Squamata (lizards and snakes), and Crocodilia.

Description

Test your knowledge on the classification of various phyla including Porifera, Cnidaria, and Mollusca among others. This quiz covers the main classes within each phylum and their characteristics. Perfect for students of biology looking to reinforce their understanding of invertebrate taxonomy.