Chapter 20 Crustaceans Pt 2

Where does Class Remipedia come from?

Are all from caves that enter the ocean

How large can class cephalocarida get?

2 to 3 mm long

where do class cephalocarida live?

sediment

What class are true hermaphrodites?

Class cephalocarida

What class has no eyes, no carapace, and no abdonimal appendages?

Class cephalocarida

What are the three orders in class Brachiopoda?

order anostraca, order notostraca , order diplostraca

Order anostraca

Fairy shrimp

Order Notostraca

tadpole shrimp

Order Diplostraca

water fleas

What class has a flattened, leaflike phyllopodia, or legs that serve as respiratory organs?

Class Branchiopoda

What class has a complex lifestyle with extensive periods of dormancy?

Class Branchiopoda

What class has these characteristics; five cephalic, six thoracic, four abdominal segments, but reductions are common ?

Class Maxillopoda

what are nauplii?

larvae stage of crustaceans

Nauplii have what unique organ?

Maxillopodon eye

What subclass has these characteristics;

• tiny,

• less than 0.5 mm long 

• Distributed worldwide

• Live in interstitial spaces in sand 

Subclass Myastracarida

Plankton from Spongebob is an organism from what subclass?

Subclass Copepoda

What subclass has these characteristics;

• Very abundant, usually less than 2 mm in length 

• Lack carapace, retain their nauplius eye into adulthood (the one eye) 

• Single pair of uniramous maxillipeds and four pairs of flattened, biramous, thoracic swimming 

• Most free living but many parasitic 

• Development usually direct, some parasitic species exhibit specialized multiphasic life cycles

Subclass Copepoda

what subclass has these characteristics;

• Only described in 1983 about 12 species

• Tiny, smaller than 0.2 mm

• One pair of antennae on sexual females

• Have both a parthogenetic life cyle and a sexual life cycle 

• Parasitic, tantalus larvae penetrate the cuticle of hosts by a mouth tube. Then their abdomen and all thoracic lungs lost during metamorphosis to an adult 

• Juveniles bear six or seven abdominal segments 

Subclass Tantulocarida

What subclass is fish ectoparisites?

Subclass Branchiura

What subclass has these characteristics;

• Small group of mostly fish ectoparasites with sucking mouthparts

• Broad, shieldlike carapace, compound eyes, four biramous thoracic appendages and a short, unsegmented abdomen 

• Second maxillae modified as suction cups 

• No nauplius, young resemble adults

Subclass Branchiura

What subclass was formerly a phylum?

Subclass Pentastomida

What subclass is a wormlike species?

Subclass Pentastomida

what subclass has these characteristics;

• 130 species of wormlike parasites, called the tongue worms

• Mostly lung parasites of vertebrates, up to 13 cm 

• Transverse rings make them look segmented

• Nonchitinous, highly porous cuticle, molted periodically during larval stages

• Sometimes have five short protuberances on anterior end 

• Simple, straight digestive system

• No circulatory, excretory, or respiratory organs 

• Sexes separate, females usually larger than males

• Larvae are ovoid, tailed, with four stumpy legs

• Have very complex life cycles with intermediate hosts

Subclass Pentastromida

What subclass are barnacles?

Subclass Cirripedia

What subclass has the longest penis in relation to body size of any animal?

Subclass Cirripedia

What class has these characteristics;

• Barnacles, plus three smaller orders, of burrowing or parasitic forms

• Sessile as adults

• Carapace surrounds body and secrete shell of calcareous plates

• Head reduced, n o abdomen, thoracic legs long, many jointed cirri with hairlike setae

• Cirri extended between plates for filter feeding

• Most hermaphroditic, have internal fertilization, become free living cyprid larvae, attach by their first antennae, metamorphose into adult form 

• Longest penis in relation to body size of any animal 

Subclass Cirripedia

What class is the largest class how crustaceans, and how many species are there in the class?

Class Malacostraca; 20,000 species

What class are the roly polys?

Class Isopoda

What order has these characteristics;

• Have invaded terrestrial habitats all the way to very deep water

• Dorsoventrally flattened, no carapace, have sessile compound eyes

• Maxillipeds are the first pair of thoracic limbs, others lack exopods

• Development usually direct, a few parasitic forms have complex life cycles

Order Isopoda

What order is like isopoda but compressed laterally?

Order Amphipoda

What order has these characteristics;

• Resemble isopods, but compressed laterally 

• Gills in typical Malacostracan thoracic position 

• Thoracic and abdominal limbs differ in function (one pair for swimming and one pair for jumping) 

• Development direct, no metamorphosis

Order Amphipoda

What order is krill in?

Order Euphausiacea

What order has these characteristics;

• About 90 species 

• 3 to 6 cm long

• Carapace fused with all thoracic segments, does not entirely enclose their gills

• No maxillipeds, but have thoracic lungs with exopods

• Many bioluminescent because or an organ called a photophore

• Very important to marine food webs

Order Euphausiacea

What order are lobsters, crabs, and shrimp

Order Decapoda

What is the largest arthropod?

Japanese Spider Crab (4m)

What order has these characteristics;

• About 18,000 species

• Three pairs of maxillipeds and five pairs of walking legs

• Some walking legs modified to form chelae (claws) 

• Largest arthropod is a japanese spider crab (4 m) 

• Most famous is Pinchy the Lobster 

Order Decapoda

What is the most famous decapoda?

pinchy the lobster

What class has these characteristics;

• Only about 10 species, all from caves that enter the ocean

• 25 to 38 trunk segments, all identical, paired biramous swimming appendages

• Antennules biramous, maxillae and maxillipeds prehensile and adapted for feeding 

Class Remipedia 

what class has these characteristics;

• Only 9 species, 2 to 3 mm long 

• Live in sediment

• Thoracic limbs all similar, second maxillae similar to thoracic limbs

• No eyes, carapace or abdominal appendages

• True hermaphrodites, eggs and sperm through a common duct 

Class Cephalocarida