Marine Biology: The Nematodes And Related Ecdysozoan Phyla

Front 1

_____ of nematodes are abundant in all moist habitats and play an important role as decomposers and in nutrient cycling.

Back 1

Free-living forms

Front 2

Nematodes are an especially important constituent of the _____, or, interstitial community in marine habitats

Back 2

Meiofauna

Front 3

Community of microorganisms that lives in the microscopic film of water between grains of sand on beaches in the intertidal and subtidal zones

Back 3

Interstitial community, or, meiofauna in marine environment

Front 4

Phylum Rotifera

Back 4

Rotifers

Front 5

Rotifers important members of what community(s)?

Back 5

Important members of benthos and zooplankton in freshwater & marine habitats; very important in meiofauna

Front 6

Rotifers have a head with _____, rounded plates with marginal cilia that resemble spinning wheels when viewed with a microscope; used for feeding and locomotion.

Back 6

" Wheel organs"

Front 7

Have well-developed jaws and muscular organ in pharynx called _____.

Back 7

Mastax

Front 8

Phylum Acanthocephala

Back 8

Spiny-Headed Worms

Front 9

Phylum Annelida

Back 9

Segmented Worms

Front 10

Segmentation of annelids involves dividing body in series of repeating units separated by transverse layers of tissue called _____.

Back 10

Septa

Front 11

Annelids: Bristle-like hairs, or, _____, present in many species

Back 11

Setae

Front 12

3 Classes of Annelids

Back 12

A. Class Polychaeta (poly = many / chaeta = bristles [setae])
B. Class Oligochaeta (oligo = few / chaeta = bristles)
C. Class Hirudinea – leeches

Front 13

Class Oligochaeta: Several anterior segments fused forming _____, which secretes cocoon for receiving eggs

Back 13

Clitellum

Front 14

Class Polychaeta: Each segment usually bears a pair of lateral, flap, or paddle-like appendages called _____.

Back 14

Parapodia

Front 15

Annelids: Two layers of body muscles surrounds coelum.

Back 15

A. Outer circular layer
B. Inner longitudinal layer

Front 16

Annelids: Anterior segments specialize, forming head or head region, bearing brain and sense organs.

Back 16

Cephalization

Front 17

Annelids: Excretion by _____; one pair/segment.

Back 17

Nephridia

Front 18

Polychaeta: Sexes separate

Back 18

(Dioecious; di = two / oecos = house)

Front 19

Polychaeta: Nearly all sp. are _____.

Back 19

Benthic

Front 20

Polychaeta: Free-living or burrowing worms with all segments similar.

Back 20

Errantia

Front 21

Nereis

Back 21

Clam or sand worms

Front 22

Glycera

Back 22

Marine bloodworm – often sold as bait

Front 23

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

Back 23

Sedentaria

Front 24

Earthworms- What class?

Back 24

Class Oligochaeta

Front 25

Definitive host marine mammals; causes problems with ppl eating marine fish

Back 25

Anasakis

Front 26

Probably most abundant animals on Earth

Back 26

Nematodes