Invertebrates Flashcards Preview

Marine biology > Invertebrates > Flashcards

Flashcards in Invertebrates Deck (29)
Loading flashcards...
1

Characteristics of Cnidaria

Radial symmetry
Body forms = polyp or medusa
Gastrovascular cavity, only one opening
Respiratory through diffusion
Nematocysts

2

Families in Cnidaria: Anthozoa
+ Characteristics

Anemones, corals

Can move as colony
Liver near islands
Make CaCo3
Have a stomach cavity

3

Characteristics of phylum Ctenophora (comb jellies)

8 rows of ctenes (ciliary combs)
Bi-radial symmetry
Cilia beats continuously-refracts light
Realities at body surface
Some have sticky cells (colloblasts)
Rudimentary organs & simple guy

4

Characteristics of Porifera (sponges)

-most simple
-no symmetry
-collar cells intake food + O2
-pore cells intake H2O
-made of CaCo3, SiO2, or spongin
-sessile, benthic filter feeders
Most hermaphrodites w/ internal fertilization + broadcasting
-some reproduce asexually

5

Characteristics of Phylum Platyhelminthes (flatworms)

20,000 + species
Central nervous system, brain, nerve chords, muscularity system, organs
Bilateral
Many parasites
No skeleton
Sexual, most have larval stage

6

Characteristics of phylum Nematoda (roundworms)

Bilateral symmetry
Digestive tract, true organs
Hydrostatic skeleton
Many decomposes and parasites
Sexual with larvae
Often seen in fish flesh

7

Characteristics of lophophorates

Bilateral
Unsegmented, colonial
Exoskeleton
U shaped gut
Sexual and asexual
Benthic filter feeders

8

Characteristics of Phylum Annelida

Bilateral, segmented
Gut cavity. Complex movements and systems
2 central nerve chords
Peristaltic movement
Kidney for nitrogenous waste and parapodia on each segment
Closed circulatory system
Gills
Hydrostatic skeleton
Sexual; trochophore larvae

9

Characteristics of polychaete worms

Most Annelida: 6,000 sp.
Build tubes
Uses cilia and mucus for feeding
Can live singly or in aggregations

10

Characteristics of Phylum sipuncula (peanut worms)

All marine: 350 species.
Benthic; most intertidal, a few deep sea
Unsegmented
Mouth and anus same end
Burrows
Sexual; external fertilization

11

Characteristics of Phylum Echiura (fat innkeeper)

Create U shaped burrows: habitat for other species
Sweeps detritus with proboscis and urechis using a mucus net
Pumps water through burrow and net
Can curl up like peanut worm
Many live in wetlands

12

Characteristics of cheatognatha (arrow worms)

Bilateral
Unsegmented, flattened, small
Cilia senses movement in water
Hydrostatic
Planktonic
Predators
Hermaphrodites

13

Characteristics of Molluscs

2nd abundant phylum in ocean; 110,000+ species
Soft body with CaCo3 shell
Bilateral, Unsegmented
Ventral, muscular foot
Radula made of chitin
Desperate moth and anus
Most have open circulatory system
Most have trochophore larval stage

14

Characteristics of Gastropoda (snails, midi branches, limpets)

90,000 species
Feed with radula & rasping tongue
Most have coiled shell
Most grazers
Some sessile but most mobile

15

Characteristics of Bivalvia (clams, mussels, oysters)

2 crystalline shells made from enzyme secretion
Siphon, foot, gills
Make pearls
Laterally compressed
Some burrow, bore, or starch to hard surfaces

16

Class Cephalopoda

Siphon for jet propulsion
Funnel, ink, pen, beak
Octopuses: 8 arms. No shell
Squid: 10 arms, 2 tentacles, pen, largest invertebrate
Cuttlefish: 8 arms, 2 tentacles, cuttle bone

17

Class polylacophora

Chitons. 8 plates, radula, foot

18

Phylum anthropoda

1 mil species: most abundant
Exoskeleton of chitin
Most periodically

19

Characteristics of Crustacea

Copepods, crabs, lobsters, shrimp, krill, barnacles

Bilateral, segmented, jointed legs
Dorsal heart and central nerve chord
Simple brain
Open circulatory system
Separate sexes, planktonic nauplius larvae

20

Characteristics of Copepoda

Planktonic, major consumers of phytoplankton

21

Characteristics of Decapoda

Crabs, shrimps, lobsters

Tail used to tell sex

22

Characteristics of Isopoda

Kelp Isopoda
Some parasitic

23

Characteristics of amphipoda

Sand fleas, caprellids
Occur in great numbers
Many benthic in soft sediment

24

Characteristics of Cirripedia

Barnacles
Sessile, filter feed with feet
Hermaphroditic

25

Characteristics of Echinodermata

6,000 species
Radial pentamerous symmetry as adults; bilateral larva
3 body cavities
Endoskeleton of CaCo3
Water vascular system
Poor circulatory system
Non segmented
Most benthic
Most separate sexes

26

Characteristics of Asteroidea

Sea stars

Can have up to 50 arms
External digestion

27

Characteristics of Echinoidea

Urchins and sand dollars

No arms
Sand dollars filter feed with tube feet and move with spines
Urchins graze algae

28

Characteristics of Ophiuroidea

Brittle and basket stars

Arms wave like snake; used for movement and filter feeding

29

Characteristics of Holothuroidea

Sea cucumbers

Lack spines (soft spiny projection)
Filter and deposit feeders
They clean the sand