Arthropoda |
Jointed foot |
Arthropods |
Chitin exoskeleton |
&&&&&&&&01134000.&&&&&01,134,000+ |
Mollusca |
Soft |
Mollusks / molluscs |
Muscular foot and mantle round shell |
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Chordata |
With a cord |
Chordates |
Hollow dorsal nerve cord, notochord, pharyngeal slits, endostyle, post-anal tail |
&&&&&&&&&0100000.&&&&&0100,000+ |
Nematoda |
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Round worms |
Round cross section, keratin cuticle |
&&&&&&&&&&080000.&&&&&080,000–1,000,000 |
Platyhelminthes |
Flat worms |
Flat worms |
|
&&&&&&&&&&025000.&&&&&025,000[12] |
Annelida |
Little ring |
Segmented worms |
Multiple circular segment |
&&&&&&&&&&017000.&&&&&017,000+ extant |
Cnidaria |
Stinging nettle |
Coelenterates |
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&&&&&&&&&&011000.&&&&&011,000 |
Echinodermata |
Spiny skin |
Echinoderms |
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&&&&&&&&&&&07000.&&&&&07,000 extant; approx. 13,000 extinct |
Porifera• |
Pore bearer |
Sponges |
Perforated interior wall |
&&&&&&&&&&&05000.&&&&&05,000+ extant | Bag Body Cross Bag Red Messenger Owl Owl Oilcloth Print Print nvX7Bff
Bryozoa |
Moss animals |
Moss animals, sea mats |
Lophophore, no pedicle, ciliated tentacles |
&&&&&&&&&&&05000.&&&&&05,000 extant |
Rotifera |
Wheel bearer |
Rotifers |
crown of cilia at front |
&&&&&&&&&&&02000.&&&&&02,000 |
Nemertea |
A sea nymph |
Ribbon worms |
|
&&&&&&&&&&&01200.&&&&&01,200 |
Tardigrada |
Slow step |
Water bears |
Four segmented body and head |
&&&&&&&&&&&01000.&&&&&01,000+ |
Acanthocephala |
Thorny headed worms |
Thorny-headed worms |
Reversible spiny proboscis. Now usually included in Rotifera. |
&&&&&&&&&&&&0756.&&&&&0756 extant (= living) |
Gastrotricha |
Hair stomach |
Meiofauna |
Two terminal adhesive tubes |
&&&&&&&&&&&&0690.&&&&&0690 |
Nematomorpha |
Thread form |
Horsehair worms |
|
&&&&&&&&&&&&0320.&&&&&0320 |
Brachiopoda |
Arm foot |
Lamp shells |
Lophophore and pedicle |
&&&&&&&&&&&&0300.&&&&&0300-500 extant |
Onychophora |
Claw bearer |
Velvet worms |
Legs tipped by chitinous claws |
&&&&&&&&&&&&0200.&&&&&0200 extant |
Entoprocta |
Inside anus |
Goblet worm |
Anus inside ring of cilia |
&&&&&&&&&&&&0150.&&&&&0150 |
Kinorhyncha |
Motion snout |
Mud dragons |
Eleven segments, each with a dorsal plate |
&&&&&&&&&&&&0150.&&&&&0150 |
Sipuncula |
Small tube |
Peanut worms |
Mouth surrounded by invertible tentacles |
&&&&&&&&&&&&0144.&&&&&0144–320 |
Loricifera |
Corset bearer |
Brush heads |
Umbrella-like scales at each end |
&&&&&&&&&&&&0122.&&&&&0122 |
Chaetognatha |
Longhair jaw |
Arrow worms |
Chitinous spines either side of head, fins |
&&&&&&&&&&&&0100.&&&&&0100 extant |
Ctenophora |
Comb bearer |
Comb jellies |
Eight "comb rows" of fused cilia |
&&&&&&&&&&&&0100.&&&&&0100 extant |
Hemichordata |
Half cord |
Acorn worms, pterobranchs |
Stomochord in collar, pharyngeal slits |
&&&&&&&&&&&&0100.&&&&&0100 extant |
Gnathostomulida |
Jaw orifice |
Jaw worms |
|
&&&&&&&&&&&&0100.&&&&&0100 |
Rhombozoa |
Lozenge animal |
— |
Single axial cell form front to bak, surrounded by ciliated cells |
&&&&&&&&&&&&&075.&&&&&075 |
Orthonectida |
Straight swim |
|
Single layer of ciliated cells surrounding a mass of sex cells |
&&&&&&&&&&&&&020.&&&&&020 |
Priapulida |
Little Priapus |
|
|
&&&&&&&&&&&&&016.&&&&&016 |
Phoronida |
Zeus's mistress |
Horseshoe worms |
U-shaped gut |
&&&&&&&&&&&&&011.&&&&&011 |
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Wheel carrying |
Symbion |
Circular mouth surrounded by small cilia |
&&&&&&&&&&&&&&03.&&&&&03+ |
Xenoturbellida |
Strange flatworm |
— |
Ciliated deuterostome |
&&&&&&&&&&&&&&02.&&&&&02 |
Micrognathozoa |
Tiny jaw animals |
— |
Accordion-like extensible thorax. Newly discovered; close to Rotifers. |
&&&&&&&&&&&&&&01.&&&&&01 |
Placozoa |
Plate animals |
|
|
&&&&&&&&&&&&&&01.&&&&&01 |
Acoelomorpha |
Without gut |
Acoels |
No mouth or alimentary canal (alimentary canal = digestive tract in digestive system) |
|