Arthropod Class Crustacea-Malacostraca (Crayfish, Scuds, and Sowbugs)

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Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Crustacea-Malacostraca (Crayfish, Scuds, and Sowbugs)

Order in Crustacea-Malacostraca
AmphipodaScuds	4	18
DecapodaCrayfish	2	15
IsopodaSowbugs	2	6

Common Name

Match	Common Name
	Crayfish, Scuds, and Sowbugs

Pictures Below ↓

Crustaceans are classified as one of those inconvenient intermediate taxonomic levels, the subphylum. The varieties of interest to trout anglers are in the class Malacostraca.

It contains the orders of scuds (Amphipoda), sowbugs (Isopoda), and crayish (Decapoda). Crayfish and scuds are both extremely important trout prey.

8 Arthropod Specimens in the Class Crustacea-Malacostraca:

Specimen Page:12

Amphipoda (Scuds) Scud Adult

View 7 Pictures

Region: Northeast

Collected Mar 29, 2006

Added Apr 7, 2006

Cambaridae Crayfish Adult

View 4 Pictures

Region: Upper Midwest

Collected Jan 31, 2004

Added Jan 25, 2006

Caecidotea (Cress Bugs) Sowbug Adult

View 3 Pictures

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

Specimen Page:12

1 Streamside Picture of Crustacea-Malacostraca Arthropods:

View Full Size (1.4X larger)

I took this picture of a scud from above the water's surface in a very shallow, clear, tiny bit of water at the margin of a little spring pond.

In this picture: Arthropod Order Amphipoda (Scuds).

RegionUpper Midwest

Date TakenMay 28, 2005

Date AddedFeb 8, 2006

CameraCanon EOS 20D

10 Underwater Pictures of Crustacea-Malacostraca Arthropods:

Underwater Photo Page:12

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A crayfish chews on a Hexagenia limbata nymph shortly after a small Hex emergence. I didn't catch any fish, but playing around with my flashlight and camera in the rocks proved productive.

In this picture: Arthropod Order Decapoda (Crayfish) and Mayfly Species Hexagenia limbata (Hex).

RegionUpper Midwest

Date TakenJun 14, 2006

Date AddedJun 30, 2006

CameraPentax Optio WPI

View Full Size (1.9X larger)

A water boatman and a scud are visible in this picture. Can you find them?

In this picture: True Bug Family Corixidae (Water Boatmen) and Arthropod Order Amphipoda (Scuds).

RegionUpper Midwest

Date TakenApr 13, 2004

Date AddedJan 25, 2006

CameraOlympus C740UZ

View Full Size (2.3X larger)

In this picture: Arthropod Order Decapoda (Crayfish).

RegionUpper Midwest

Date TakenMar 24, 2004

Date AddedJan 25, 2006

CameraOlympus C740UZ

Underwater Photo Page:12

Recent Discussions of Crustacea-Malacostraca

Taxonomy 2 Replies »

Posted by DMM on Nov 29, 2006

Last reply on Dec 1, 2006 by DMM

Malacostraca is a class but Crustacea is a subphylum

There is 1 more topic.

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Jargon Defined:

Emergence: The transformation of a nymph or pupa into the adult winged stage of an insect. The term may refer to the emergence of an individual, or the daily or yearly event in which all individuals of a species emerge.

Nymph: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).