Members of phylum Onychophora are all _________ and are found in ____ ecosystems.
|C)||filter feeders, freshwater.|
The members of phylum Onychophora are distinguished from the other phyla in this chapter by having
|C)||a tracheal system.|
|D)||a closed circulatory system.|
The members of phylum Tardigrada are distinguished from the other phyla in this group by having
|C)||a trochophore larvae.|
A crown of ciliated tentacles in a double row around the mouth opening, which is used for respiration and feeding, is called a(n)
Most members of phylum Tardigrada are considered to be herbivorous feeders and are found in films of water associated with primitive plants.
Onychophorans have annelid-like characteristics such as a muscular body wall and segmentally arranged nephridia, yet arthropod-like characteristics such as a large brain, and a tracheal system.
Traits of onychophorans that are unique include oral papillae, body tubercles for locomotion that are rather ventrally located, and suppression of external segmentation.
Of the Kinorhyncha, Priapulida, Lorcifera, and Onychophora, the only phylum which has members which are fully ambulatory and terrestrial is Onychophora.
Onychophorans have spiracles the are different from those found in annelids, as they cannot close. Therefore, these animals are restricted to moist areas, as water would be lost from the tracheal system in a dry habitat.
Of the groups studied in this chapter, only the onychophorans exhibited viviparity.
Cryptobiosis is best exhibited by the tardigrades, and is induced by unfavorable changes in environmental conditions.
Because of various characters, some researchers have suggested that tardigrades are more aligned with the acoelomates.
Which one of the pseudocoelomate phyla are tiny marine animals with 11 external segments and recurved spines on the surface for locomotion?
Which one of the following pseudocoelomate phyla has members that live between sand grains and can retract their bodies into a circular lorica?
The nematodes are unique in that sperm are completely lacking ____.
The nematodes are unique in that motile ________ and ________ are completely lacking.
|C)||ocelli, blood cells|
|D)||blood cells, cilia|
Some of the nematodes are successful as endoparasites because their bodies are covered by a
|A)||layer of cilia.|
|C)||skin with glandular cells.|
Four examples of parasitic nematodes are hookworms, filarial worms, ________, and ________
|B)||pinworms, trichina worms|
|C)||trichina worms, ribbon worms|
|D)||ribbon worms, tapeworms|
Which one of the following pseudocoelomate phyla has members that are free living as adults, and parasitic in arthropods as juveniles?
Which one of the following is a colloquial term for a nematomorph?