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48 Cards in this Set

  • Front
  • Back
When the adult of a descendant species resembles the larval form of the ancestral species, this is...
Paedomorphosis
Animals in the phyla are small flat aceolomate worms that are bilaterally symmetrical, triploblastic, and do not contain appendages.
Acoelomorpha
Most turbellarian species...
Are freshwater predators and scavengers.
Which of the following is NOT a function of the parenchyma of the platyhelminthes?

-Provide skeletal support
-Nutrient storage
-Oxygen storage
-Production of gametes
-Transport of materials
Production of gametes
Among the flatworms, when a digestive tract is present, it has...
A single opening, the mouth.
The free-living flatworms are classified in the class...
Turbellaria
What is not true of the turbellarian gastrodermis?
It contains smooth muscle cells
_________ are rodlike cells of the turbellarian epidermis that swell and form a protective mucous sheath.
Rhabdites
The _________ layer of a fluke is composed of carbohydrates and proteins and helps protect the fluke from the host's enzymes and antibodies.
Glycocalyx
Turbellarians glide over substrates using _________ and muscular undulations.
Cilia
In larger species of turbellarians, the highly branched digestive cavity partially compensates for the....
Absence of a circulatory system.
Among those turbellarians possessing a digestive cavity, digestion is...
Both extracellular and intracellular.
The osmoregulatory organs of turbellarians are called...
Protonephridia
The flame cell system and protonephridia of freshwater turbellarians primarily serve to remove __________ from the body.
Excess water
In turbellarian nervous system, neurons carrying information to the brain are ________ neurons.
Sensory
In turbellarians, the nervous tissue is concentrated anteriorly in clusters of neurons called...
Ganglia
The small subclass of flukes, __________, includes those that are primarily internal parasites of molluscs.
Aspidogastrea
Chemoreceptors that aid in the location of food are especially dense in the __________ of turbellarians.
Auricles
The simple eyespots seen in most turbellarians are called...
Ocelli
Asexual reproduction by fission in some turbellarians results in a chain of individuals called ____________ that later will become independent individuals.
Zooids
The free-swimmin larval stage of some turbellarians is called a/an...
Muller's larva
The members of the Class Monogenea have tissues that develop from this many germ layers.
Three
A continuous multinucleate layer, formed by cell fusion, is called a/an...
Syncytium
The epidermis of a fluke has an outer layer called the ___________, which forms are syncytium.
Tegument
Flukes in the subclass Digenea always have two or more...
Hosts
In the class Trematoda, the phenomena of producing many cercariae is known as...
Polyembryony
The larval stage of memebers of class Monogenea is called the...
Oncomiracidium
Most flukes belong to the subclass...
Digenea
The lidlike hatch on trematode egg is called the...
Operculum
The first larval stage in the life history of digenetic fluke is the...
Miracidium
The encysted cercaria stage of a digenetic fluke is called the...
Metacercaria
Blood flukes of the genus __________ are important human parasites.
Schistosoma
The most highly specialized class of parasites within phylum Platyhelminthes is...
Cestoidea
The tapeworm strobila is made of many repeated units called...
Proglottids
Tapeworms lack....
A mouth and digestive tract
The holdfast structure of a tapeworm is called the...
Scolex
Scolex, neck and _______ comprise the three body regionds of a tapeworm.
Strobila
The oldest proglottids at the end of a tapeworm are filled with eggs, and are said to be...
Gravid
The six-hook (hexacanth) larva that develops from the egg of the beef tapeworm is the...
Onchosphere
The larval stage of the beef tapeowrm that encysts in skeletal muscles is called the...
Cysticercus
Nemertereans differ from flatworms in that they possess....
A complete digestive tract
The larval stage of the broad fish tapeworm that encysts in muscle is called the...
Pleurocercoid
The proboscis worms belong to the phylum...
Nemertea
The proboscis of nemerteans is held within a sheath called the....
Rhynchocoel
Nemerteans differ from flatworms in that they have a complete gut and a....
Circulatory system
The helmet-shaped, ciliated larva of nemerteans is the....
Pilidium
Animals in the phyla Cycliophora live exclusively on the mouthparts of...
Lobsters
Which phyla is the newest phylum to be named, and to date, only includes one species?
Cycliophora