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BioConc.II Exam I

Invertebrates

QuestionAnswer
What percent of species lack a backbone? 99%
About how many known species of invertebrates are identified? 1.3 million
What are Porifera and what are some key features? Sponges, they are sessile and suspension feed.
About how many identified Porifera species are there? 5,000
What are some examples of Cnidaria and what are some key features? Corals, jellies, and hydra. They have a gastrovascular cavity with one opening.
About how many species of Cnidarians are identified? 10,000
What are some examples of Platyhelminthes? What are some key features? Flat worms, tape worms, planarians, and flukes.They are bilaterally symmetrical, have a nervous system, have eyes, but no body cavity.
How many identified Platyhelminthes are there? 20,000
What of some key features of Rotiferas? They are microscopic, have a digestive tract, and suspension feed.
How many species of Rotifera are there? 1,800
What is a key feature of Ectoprocta? How many species are there? They live in sessile colonies. There are 4,500.
What are some characteristics of Brachiopoda? They are lamp shell-like, are NOT mollusks, are stalked not footed.
How many Brachiopoda species are there? 335
What is an example of Ctenophora? Comb jellies, they are cnidarian like in most ways.
What are some examples of mollusks? What are some key features? Snails, clams, squids, and octopi. They have soft bodies and have either shells or reduced shells.
How many identified Mollusks are there? 93,000
What is an example of Annelids? What are some key features? Segmented worms. THey can be marine, freshwater, and terrestrial.
How many identified species of Annelids exist? 16,500
What is an example of a Nematode? What are some key features? Roundworms. Many are parasites and they can live in either soil and water.
How many identified species of Nematodes exist? 25,000
What is an example of an Onychophora? What are some key features? Velvet worms.They developed in the cambrian age and are terrestrial.
How many species of Onychophora have been identified? 110
What are examples of Echinodermata? What are some key features? Dollars, stars, urchins. They have radial symmetry as adults and have tube feet.
How many species of Echinodermata have been identified? 7,000
What are some examples of Tardigrada? Water bears and space bears.
What are some characteristics of Arthropods? They have a segmented exoskeleton and have jointed appendages.
How many identified species of arthropods are there? 1,000,000 +
What is an example of a Hemichordata? What are some key features? Acorn worm. They are deuterostomes (anus first), have gills, and a dorsal nerve chord.
How many Hemichordata species are identified? 85
What are some examples of Chordates? What are features of others? Tunicates, lancelets, hagfishes. Others have backbones.
Created by: MichaelaMH
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