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39 Cards in this Set
- Front
- Back
How many species are there in Phylum Rotifera?
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There are 1,800 Species.
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What is the size range of Rotifers?
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Mostly, Rotifers are microscopic but the largest one is 2mm in size.
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How is reproduction in rotifers?
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They use parthenogenesis where females produce females from unfertilized eggs... but sometimes, when conditions are bad, they produce degenerate males who live long enough to fertilize the eggs.
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Rotifers are ______ cellular
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Multicellular.
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How do rotifers eat?
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They have cilia around their mouth which brings in water & food --> jaw (mastax)
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What is a mastax?
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A grinding organ for rotifers.
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What kind of feeders are rotifers?
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They are suspension feeders & raptorial (predatory)
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What is the arrangement of body parts for Mollusks?
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A ventral MUSCULAR FOOR
a dorsal MANTLE In between -- Visceral Mass |
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What does the visceral mass contain?
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It contains the internal organs
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Do all mollusks have shells?
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No. Most do have one thats derived from the mantle but some have a lost shell, such as the octopus.
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What are the 5 classes of Mollusks?
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Scaphopods
Polyplacophora Gastropoda Bivalvia Cephalopoda |
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What is torision in Gastropods?
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It is when the visceral mass is folded by 180 degrees. (Snails)
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How many shells do chiton (polyplacophora) have?
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They have 7-8 shells.
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How can a squid and octopus move?
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They can move by jet propulsion
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what class do squids and octopus belong to?
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Cephalopoda
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What is a nautilus?
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How many known species of phylum arthropoda are there?
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900,00
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What are the major characteristics of an arthropod?
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Exoskeleton
Jointed Appendages Open circulatory system |
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What is the exoskeleton of an arthropod made of?
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It is made up of chitin and sometimes called a CUTICLE
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Why do arthropods needs to molt?
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They need to molt because the exoskeleton grows and b/c its a hard shell.
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The exoskeleton in arthropods helps prevent ______ loss.
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Water loss.
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What are the four major SUBPHYLA for arthropods?
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Trilobites (extinct)
Chelicerates Crustaceans Uniramians |
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What is incomplete metamorphosis?
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A slight change where the young resemble the adults
Ex: Grasshoppers. |
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What is complete metamorphosis?
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A change where the young look totally different from the adults.
Ex: Caterpillar to butterfly |
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What are the stages of complete metamorphosis?
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Egg --> Larvae --> Pupae --> Adult
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When were Trilobites common?
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They were common during the Cambrian to the Paleozoic.
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What kind of eyes did trilobites have?
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They had compound eyes.
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Trilobites had ______ ______ body parts.
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They had three longitudinal body parts.
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What subphyla do spiders, ticks and scorpians belong do?
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Spiders, ticks, and scorpions belong to the Chelicerate subphyla.
(lack antennae) |
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Modified, first set of claw like apendages are known as :
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Chelicerae
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What are the two main groups of Chelicerae?
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Horseshoe crabs (aquatic scavengers)
Arachnids (carnivirious or parasitic) |
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Crustaceans have _____ pairs of antennae.
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Two!
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Crabs, lobsters, isopods, barnaclesm decapos, water fleas, shrimp belong to which subphyla?
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Crustaceans
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What does biramous appendages mean?
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This means that appendages are branched -- have two branches.
Crustaceans. |
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What phyla are included in the Kingdom LOPHOPHRATES?
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Phylum Bryozoa and Phylum Brachipoda
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How many species are in phylum bryozoa?
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About 5,000 species
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How many species are in phylum Brachipoda?
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330 living, 30,00 fossil
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What are the characteristics of Phylum Bryozoa?
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They are colonial animals that have a hard exoskeleton. They are aquatic and sessile; some are important reef builders.
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What are the characteristics of Phylum Brachiopoda?
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They resemble clams & bivalvia (mollusks)
THey have DORSAL and VENTRAL shells that DIFFER in size. They are NOT related to Bivalves. They are FILTER FEEDERS and sessile. |