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26 Cards in this Set
- Front
- Back
_____ of nematodes are abundant in all moist habitats and play an important role as decomposers and in nutrient cycling.
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Free-living forms
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Nematodes are an especially important constituent of the _____, or, interstitial community in marine habitats
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Meiofauna
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Community of microorganisms that lives in the microscopic film of water between grains of sand on beaches in the intertidal and subtidal zones
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Interstitial community, or, meiofauna in marine environment
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Phylum Rotifera
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Rotifers
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Rotifers important members of what community(s)?
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Important members of benthos and zooplankton in freshwater & marine habitats; very important in meiofauna
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Rotifers have a head with _____, rounded plates with marginal cilia that resemble spinning wheels when viewed with a microscope; used for feeding and locomotion.
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" Wheel organs"
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Have well-developed jaws and muscular organ in pharynx called _____.
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Mastax
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Phylum Acanthocephala
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Spiny-Headed Worms
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Phylum Annelida
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Segmented Worms
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Segmentation of annelids involves dividing body in series of repeating units separated by transverse layers of tissue called _____.
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Septa
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Annelids: Bristle-like hairs, or, _____, present in many species
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Setae
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3 Classes of Annelids
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A. Class Polychaeta (poly = many / chaeta = bristles [setae])
B. Class Oligochaeta (oligo = few / chaeta = bristles) C. Class Hirudinea – leeches |
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Class Oligochaeta: Several anterior segments fused forming _____, which secretes cocoon for receiving eggs
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Clitellum
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Class Polychaeta: Each segment usually bears a pair of lateral, flap, or paddle-like appendages called _____.
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Parapodia
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Annelids: Two layers of body muscles surrounds coelum.
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A. Outer circular layer
B. Inner longitudinal layer |
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Annelids: Anterior segments specialize, forming head or head region, bearing brain and sense organs.
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Cephalization
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Annelids: Excretion by _____; one pair/segment.
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Nephridia
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Polychaeta: Sexes separate
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(Dioecious; di = two / oecos = house)
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Polychaeta: Nearly all sp. are _____.
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Benthic
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Polychaeta: Free-living or burrowing worms with all segments similar.
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Errantia
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Nereis
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Clam or sand worms
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Glycera
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Marine bloodworm – often sold as bait
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Polychaeta: Sessile, benthic, tube-dwelling forms with specialization of segments, e.g. fanworms, peacock worms; filter feeders; some forms, e.g. serpulid fanworms, contribute to formation of reefs
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Sedentaria
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Earthworms- What class?
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Class Oligochaeta
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Definitive host marine mammals; causes problems with ppl eating marine fish
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Anasakis
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Probably most abundant animals on Earth
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Nematodes
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