Acanthocephala

1 - proboscis

2 - hooks

3 - host intenstine

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Polychaeta

1 - dorsal longitudinal muscle

2 - epidermis

3 - circular muscie

4 - setae

5 - acicula

6 - dorsal blood vessel

7 - intestine

8 - coelom

9 - parapodial muscles

10 - parapodium

11 - nephridium

12 - ventral longitudinal muscle

13 - ventral blood vessel

14 - nerve cord

15 - notopodium

16 - neuropodium

Polychaeta

1 - parapodia

3 - palps

4 - eyespots

5 - peristomium

6 - prostomium

7 - jaws

8 - dorsal blood vessel

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Polychaeta

1 - intestine

2 - esophagus

3 - esophageal caeca

4 - pharynx

5 - nephridia

6 - nerve cord

7 - ventral blood vessel

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Rotifera

1 - corona

2 - mastax 

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Tubellaria

1 - order Polycladida

2 - order Tricladida

3 - eyespots

4 - auricle

5 - pharynx

6 - intestine

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Ctenophora

class Tentaculata

top - Order Cydippida

bottom - Order Lobata

Phylum Ctenaphora

Class Nuda

Order Beroida

Anthomedusae

Millepora

Anthomedusae polyp

1 - gonophore

2 - gastrozooid

3 - perisarc

4 - coenosarc

Alcyonacea - gorgonians

1 - polyp

2 - tentacle

3 - axial rod

4 - gastrovascular cavity

Alcyonacea - gorgonain

skeleton forming axial rod

Alcyonacea 

stoloniferan skeleton

Actiniaria

1 - tentacles and oral disk

2 - column

3 - pedal disk

4 - pharynx

5 - siphonoglyphs

6 - gonads

7 - acontia

8 - septa of gastrovascular cavity 

Actiniaria

1 - tentacles

2 - oral disk

3 - mouth

4 - pharynx

5 - septa and retractor muscles

6 - septa and acontia

7 - column

8 - pedal disk

9 - gastrovascular cavity

Actiniaria

1 - siphonoglyphs

2 - pharynx

3 - retractor muscles

4 - primary septa

5 - tertiary septa

6 - secondary septa

7 - septal filaments

8 - gastrovascular cavity

Leptomedusae colonial polyp

1 - gastrozooid

2 - perisarc

3 - coenosarc

4 - gonozooid

5 - developing medusa

Leptomedusae medusa stage

1 - manubrium and mouth

2 - gonad

3 - tentacles

4 - exumbrella (bell)

Scleractinia

1 - theca

2 - sclerosepta

Semaeostomeae

1 - planula

2 - schyphula (planula just settled)

3 - schyphistoma (polyp)

4 - strobila

5 - ephyra

6 - lappet

7 - rhopalium

8 - oral arm

9 - manubrium and mouth

Semaeostomeae - medusa

11 - exumbrella (bell)

12 - rhopalium

13 - tentacles

14 - oral arm

15 - gonads

16 - radial canals

17 - ring canal

Siphonophora

1 - pneumatophore

2 - dactylozooid

3 - gastrozooid

4 - gonozooid

Calcarea

1 - osculum

2 - spongocoel

3 - attachment point

4 - pinacocyte layer

5 - amphiblastula larvae

6 - choanocyte layer

7 - ostia

Radiolaria

ameba

silica shells 

planktonic

axiopod

oozes

Hexactinellida

spicules - silica

6 rays often fused

Apicomplexa - Gregarinea

4 - oocysts inside gametocyst

5 - sporozoits inside oocysts

Apicomplexa - Gregarinea 

1 - trophozoite

2 - trophozoite after synergy - nuclei produces gametes

3 - gametocyst

Apicomplexa - Gregarinea

inside of host

Foraminifera

ameba

CaCO₃

planktonic or benthic

reticulopodia

forms oozes

Demospongiae

leuconoid body plan

Ciliophora

cilia

micro and macronuclei

planktonic

Ciliophora

macro and micronuclei

Calcarea

1 - osculum

2 - spicules

spicules are CaCO₃

1,3,4 rays

no spongoceal

ascon, sycon, leucon

Spicules

1 - monaxons

2 - triaxons

made of CaCO₃

Gregarinea

parasitic inside inverts

trophozoite, gametocyst, ooxysts , sporozoites

medusa - velum, acellular mesogulea, no cnidocysts in gastrodermis

polyp stage

Class Hydrozoa

Order Siphonophora

polyp and medusa joined

floats and or swim bell

planktonic

Portuguese Man of War 

Class Hydrozoa

Order Anthomedusae

polyp - benthic, athecate

medusa - planktonic, small and tall

Class Hydrozoa

Order Leptomedusae

polyp - benthic, thecate

medusa - planktonic, small and fat

jellyfish

medusa - planktonic, no velum,

polyp - benthic, scyphistoma

mesoglea with cells

cnidocytes in gastrodermis

Class Scyphozoa

Order Semaeostomeae

marginal tentacles

Aurelia - moon jelly

Class Scyphozoa

Order Rhizostomeae

no marginal tentacles

Cassopeia

no medusa

polyp divided internally by septa

Class Anthozoa

Subclass Octocorallia

8 fold symmetry

8 tentacles

pinnate (fern like)

Class Anthozoa

Subclass Octocorallia

Order Helioporacea

blue coral

CaCO₃ skeleton

1 type of polyp

reef, Pacific, benthic

sea pen

2 polyps - primary and secondary

benthic sands

gorgonians - sea fan, sea whip

2 type of poylp

internal spuicules of CaCO₃

stolon growth in most

benthic but diverse

6 fold symmetry - multiples of

non-pinnate tentacles

mat anemones

encrusting colony

hydroskeleton

siphonoglyph - 1,2,0 tubes 

sea anemones

solitary

hydroskeleton

2 siphonoglyph

benthic

strawberry anemones

solitary or colonial

hydroskeleton

no siphnoglyphs

whorls of caplitate tentacles

hard corals

colonial, few solitary

CaCO₃ skeleton

theca and sclerosepta

no siphonoglyphs

benthic

ricky

comb rows

planktonic 

carnivores

Phylum Ctenaphora

Class Tentacullata

pouches

no lobes

no pouches

lobes

flatworms

blind gut

benthic

carnivores

large 1-2cm

wide and flat

complex pharynx

branched gut

Phylum Platyhelminthes

Class Turbellaria

Order Tricladida

pharynx not complex

gut has 3 branches

round worms

free-living

very common everywhere

thick cuticle

high internal pressure

mm in size

benthic - interstitial

all feeding types

ribbon worms

rhychocoel - cavity that holds proboscis

benthic

carnivores 

corona - ring of cilia - feeding current and movement

mastax - jaw apparatus

planktonic

small particle feeders

spiny head worms

hooks used for attachment

parasitic inside vert intestine 

segmented worms

segmented externally and internally

over 80 orders

setae - bristles

parapoda - feet stumps

benhtic

many in tubes

few planktonic

carnivores or filter feeders

peanut worms

tentacles

introvert

trunk 

benthic

deposit feeders