Lab 8: Arthropods- Crustacea

What Phylum, and subphylum is this larva in? What is this larva called? What’s so important about it?

Phylum Arthropoda, Subphylum Crustacea. Nauplius larva. It’s the most typical, primitive crustacean larva.

What Phylum, Subphylum, Class, and Order is this animal in? What is its common name?

Phylum Arthropoda, Subphylum Crustacea, Class Branchiopoda, Order Anostraca. Fairy shrimp

What Phylum, Subphylum, Class, and Order is this animal in? What is its scientific name?

Phylum Arthropoda, Subphylum Crustacea, Class Branchiopoda, Order Cladocera. Daphnia (“water flea”)

What Phylum, Subphylum, Class, and Order is this animal in?

Phylum Arthropoda, Subphylum Crustacea, Class Branchiopoda, Order Ostracoda

What Phylum, Subphylum, Class, and Subclass, and Genus is this animal in?

Phylum Arthropoda, Subphylum Crustacea, Class Maxillopoda, Subclass Copepoda, Cyclops

What Phylum, Subphylum, Class, Subclass, and Genus is this animal in?

Phylum Arthropoda, Subphylum Crustacea, Class Maxillopoda, Subclass Cirrepedia, Lepas (“gooseneck barnacle”)

What Phylum, Subphylum, Class, Subclass, and Genus is this animal in?

Phylum Arthropoda, Subphylum Crustacea, Class Maxillopoda, Subclass Cirrepedia, Balanus (“Acorn barnacle”)

What Phylum, Subphylum, Class, Subclass, and Genus is the blue arrow pointing to?

Phylum Arthropoda, Subphylum Crustacea, Class Maxillopoda, Subclass Cirrepedia, Loxothylacus texanus (a rhizocephalan barnacle)

What Phylum, Subphylum, Class, and Order is this animal in? What is its common name?

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Isopoda. Rollie pollie/pill bug.

What Phylum, Subphylum, Class, and Order is this animal in? Common name?

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Isopoda. Deep sea isopod

What Phylum, Subphylum, Class, Order, and Genus is this animal in?

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Amphipoda, Gammarus

What Phylum, Subphylum, Class, Order, and Genus is this animal in? What is its common name?

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Euphausiacea, Euphasia pacifica (“krill”)

What Phylum, Subphylum, Class, Order, and Genus is this animal in? What is its common name?

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Decapoda, Homarus americanus (“American lobster”)

What Phylum, Subphylum, Class, and Order is this animal in? What is its common name?

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Decapoda. Penaeid shrimp.

What Phylum, Subphylum, Class, and Order is this animal in? Is it male or female?

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Decapoda. Female.

What Phylum, Subphylum, Class, and Order is this animal in? Is it male or female?

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Decapoda. Male.

What Phylum, Subphylum, Class, Order, and Genus is this animal in?

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Decapoda, Libinia dubia (“spider crab”)

What Phylum, Subphylum, Class, and Order is this animal in? What is its common name?

What is A-I pointing to?

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Decapoda, Crayfish.

A: cephalothorax

B: abdomen

C: uropod

D: telson

E: carapace

F: antenna

G: antennule

H: cheliped

I: chela

What Phylum, Subphylum, Class, and Order is this animal in? What is its common name?

What is A, B, and C pointing to?

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Decapoda, Crayfish.

A: stomach

B: heart

C: midgut gland

What are identifying characteristics of the Phylum Arthropoda

-hardened chitinous exoskeleton

-paired jointed appendages

-anterior appendages modified into feeding structures

-segmented body

-reduced coelom is a hemocoel with dorsal heart

-complete digestive tract

-well developed nervous system with paired ventral ganglia and well developed sense organs; muscles in bundles rather than layers

Terga (singular = tergum)

Dorsal plates of exoskeleton

Sterna (singular = sternum)

Ventral plates of exoskeleton

Chitin

A major component of the exoskeleton in Phylum Arthropoda

Phylum Arthropoda feeding appendages

Chelicerae and mandibles

Phylum Arthropoda respiratory organs

gills, book gills, tracheae, or book lungs

Phylum Arthropoda excretory organs

Coxal glands (=antennal glands, maxillary glands, green glands) or malpighian tubules

Phylum Arthropoda sense organs

Ocelli, simple eyes, compound eyes, antennae, statocysts, tactile hairs, chemoreceptors, tympanum

Identifying characters for Subphylum Crustacea (Under Phylum Arthropoda)

-Body plan: cephalothorax, abdomen, tail
-Compound eyes
-Two pairs of antennae
-Mandibles for feeding
-Branched (biramous) appendages
-Respiration by gills
-Only living subphylum that is mostly aquatic

Class Branchipoda has what orders?

-Order Anostraca (fairy shrimp, brine shrimp)
-Order Cladocera (Water fleas)

What’s special characteristics of Class Ostracoda (Under Subphylum Crustacea)?

-Carapace covers entire body, including head
-0-2 pairs of thoracic appendages

What subclasses does Class Maxillopoda have?

-Subclass Copepoda (copepods)
-Subclass Cirripedia (barnacles)

Subclass Cirripedia has _ species have _ adults

free-living (young), sessile

Class Malacostraca (Under Subphylum Crustacea) has what Orders?

-Order Isopoda (isopods; rollie-pollies)
-Order Amphipoda (amphipods)
-Order Euphausiacea (krill)
-Order Decapoda (decapods; lobster, shrimp, crabs, crayfish)