Protostomes and Parasitic Worms

Flashcards covering key concepts about protostomes, specifically focusing on the characteristics and life cycles of platyhelminthes and nematodes.

The Bilateria are characterized by __ symmetry.

bilateral

Acoelomates lack a __ body cavity.

true coelom

An example of a free-living platyhelminthes is __.

planaria

Tapeworms absorb food directly through their __.

body walls

Flame cells in flatworms are involved in __ and osmoregulation.

excretion

The anterior region of a tapeworm is called the __.

scolex

In Nematodes, the body cavity between the mesoderm and endoderm is called a __.

pseudocoel

The process in which nematodes shed their cuticle is called __.

ecdysis

Pinworms are most common in the __ population in the US.

children

The intestinal roundworm __ infects 1 in 6 people worldwide.

Ascaris lumbricoides

The class Trematoda includes __, typically found as parasites.

flukes

Many parasitic nematodes cause __ when infecting certain hosts.

disease

Each proglottid of a tapeworm is a __ hermaphroditic unit.

complex

Clonorchis sinensis is commonly known as the __ liver fluke.

Oriental

Nematodes have a nervous system made up of four __.

nerves

Many adult nematodes exhibit __, having a fixed number of cells.

eutely

The larval stage of trematodes that infects fish muscle is called __.

metacercaria