Exam 20: Crustaceans

Marine crustaceans that are sessile,secrete calcareous plates and filter-feed are

The individual units of compound eyes in crustaceans are called ________________.

The ancestral larval form of crustaceans is the __________.

The process which culminates with arthropods regularly shedding their exoskeleton because it has become too small for the growing body is called ___________________________.

Why is the adaptive diversification of the Crustacea so great while that of other groups,such as the Annelida so much less?

Most appendages of crustaceans are two-branched,or _____________________.

Why are barnacles considered crustaceans when they are anchored in one place as adults?

What is the function of the green glands in the crayfish?

Crustaceans have better-developed sense organs than do the annelids because they have _______ ________ ,delicate projections of cuticle distributed over the body,and especially the mouthparts.

How does the statocyst work to communicate position to the crayfish?

The excretory antennal glands in decapods are also called ________ _________.

Water fleas,which belong to the branchiopodan suborder____________,often reproduce by parthenogenesis.

The two joints of the protopod are the ______ ______ and medial endopod.

A small group of hermaphroditic crustaceans that is unique in discharging both eggs and sperm through a common duct is the

The appendages of a crayfish are examples of serial ___________________.

If crayfish are raised in a very clean aquarium that only has iron filings in the floor,and they are allowed to go through several molts so that an iron filing is now serving as a statolith,what would be the effect of a large magnet suspended above the aquarium?

The major body space in arthropods is the

In the parasitic barnacle order Rhizocephala,the larvae metamorphose into a _______ _______ that injects cells into the hemocoel of the crab that grows into root-like processes throughout the crab body.

The dorsal cuticle of the head of many crustaceans extends posteriorly to form a covering called the ___________________.

Explain why pentastomids were placed in Ecdysozoa.