Lab 4 Flashcards
Which of the following Arthropod subphyla went extinct at the end of the Permian era, 252 million years ago?
Trilobita
Approximately how many species of crustaceans have been described?
65,000 to 70,000
Sea spiders belong to which Arthropod class?
Pycnogonida
The joints of a crustacean can move on bearings called:
Condyles
Which of these crustaceans belong to the Maxillopoda?
Barnacles, Copepods, Ostracods
All of them
Which of these crustaceans DOES NOT belong to the Malacostraca? Euphausiids, Isopods, Amphipods, Branchiopods
Branchiopods
True or False: Crustaceans are dioecious
True
Which of the following larval forms occur in the lobster lifecycle?
Phyllosoma
Nauplius larvae can develop into what crustacean larval form?
Cypris, Zoea, Phyllosoma
Arthropods have the following key features
- An extensive hemocoel and reduced true coelom
- No circular muscle blocks
- No motile cilia
The ligaments that expand the lobster heart following a contraction are:
Alary ligaments
Digestion in the lobster occurs in the:
Digestive gland
The cardiac stomach of the lobster contains:
The gastric mill
The sieve press in the pyloric stomach of the lobster controls
The size of particles entering the digestive system
Before flowing through the gills, hemolymph (blood) collects in what structure in a lobster:
Infrabranchial sinus
Which of these is not a gill type found in lobsters?Pleurobranchia, Podobranchia, Arthrobranchia, Sternobranchia
Sternobranchia
Some crustaceans have an axillary blood pumping vessel in the head region called a:
Cor frontale
Water flow through the branchial chamber is generally in which direction?
Posterior to Anterior
The structures that move water through the branchial chamber of a lobster are?
Gill bailers
Which of these crustacean groups DOES NOT have suspension feeding in any of its species.
Euphausiids, Anomuran crabs, Copepods
They all have suspension feeding
Which of these crustaceans are NOT benthic
Adult galatheid crabs, Euphausiids, Thecostraca, Cephalocarida
Euphausiids
The difference between a male and female lobster can be determined externally from:
The presence of an additional claw on the 5th the pereopod
The pore located on the antennae of the lobster is what?
A nephridiopore
Excretion of nitrogenous wastes in the lobster primarily occurs:
Via the antennal glands and across the gills
Place in order starting from outside the animal to inside, the layers of the crustacean cuticle:
Epicuticle, exocuticle, calcified endocuticle, uncalcified endocuticle, membranous layer, epidermis
