Lab 2: Kingdom Protista

• Dinoflagellate (45K) 'phytoflagellate';
  A-nucleus, B-sulcus, C-flagellum

• Euglena (27K) 'phytoflagellate'
  A-flagellum, B-contractile vacuole, C-chloroplast, D-nucleus

• Volvox (49K) colonial 'phytoflagellate'
  A-gelatinous matrix, B-flagellated cells

• Giardia (61K) 'zooflagellate'
  A-flagellum, B-adhesive disc

• Trypanosoma (31K) 'zooflagellate' ;
  A-nucleus, B-kinetosome, C-undulating membrane, D-flagellum

• Amoeba (51K) 'sarcodine';
  A-nucleus, B-pseudopod

• Chaos (62K) 'sarcodine';
  A-nucleus, B-pseudopod

• Difflugia (45K) 'sarcodine';
  A-nucleus, B-pseudopod

• Pelomyxa (54K) 'sarcodine';
  A-pseudopod, B-nucleus

• Foraminifera (56K) 'sarcodine';
  A-Test, B-shell pores

• Plasmodium (19K) 'sporozoan';
  A-trophozoite inside red blood cell, B-uninfected red blood cell

• Paramecium (56K)mobile ciliate, Ph. Ciliophora.
  A-oral groove, B-macronucleus, C-contractile vacuole

• Paramecium (pellicle; 51K) Ph. Ciliophora;
  structure is what the label says, man!

• Stentor (75K) sessile, stalked ciliate, Ph. Ciliophora.

Lab 3: Phylum Cnidaria & Phylum Ctenophora

• Obelia colony (65K) Cl. Hydrozoa, Or. Leptomedusa, a thecate hydroid;
  A-hydrotheca or theca, B-gonozooid, C-gastrozooid

• Hydra (whole mount; 87K) Cl. Hydrozoa, Or. Anthomedusa, an athecate hydroid;
  A-tentacle, B-hypostome, C-body column, D-basal disc

• Hydra (longitudinal section; 31K) Cl. Hydrozoa, Or. Anthomedusa;
  A-mouth, B-hypostome, C-gastrovascular cavity, D-epidermis, E-mesoglea, F-gastrodermis

• Hydra (cross section; 89K) Cl. Hydrozoa, Or. Anthomedusa;
  A-epidermis, B-mesoglea, C-gastrodermis, D-gastrovascular cavity

• Hydra (cross section, higher power; 90K) Cl. Hydrozoa, Or. Anthomedusa;
  A-mesoglea, B-gastrodermis, C-epidermis, D-nematocysts in cnidocytes

• Gonionemus (oral and aboral view; 48K) Cl. Hydrozoa, Or. Limnomedusa; a trachyline medusa;
  A-velum, B-gonad, C-radial canals

• Aurelia- medusa (52K) Cl. Scyphozoa, a 'true' jellyfish;
  A-mouth, B-gonad, C-mouth lobes, D-gastric pouch, E-radial canals, F-rhopalium

• Aurelia (planulae & SEM, 44K) Cl. Scyphozoa;
  the larval stage of most Cnidaria; note the covering of cilia in SEM image

• Aurelia (planula whole mount, close up, 44K) Cl. Scyphozoa;
  Note the two distinct layers of cells; which cell-layers are these?

• Aurelia- schyphistoma (53K) Cl. Scyphozoa; a polyp stage unique to Scyphozoa

• Aurelia- strobila (46K)Cl. Scyphozoa; a polyp stage unique to Scyphozoa that buds off larval medusae (ephyra)

• Aurelia- ephyra (68K) Cl. Scyphozoa;
  a larval medusa stage unique to Scyphozoa

• Medusa comparison (Aurelia vs Gonionemus, 88K) Cl. Scyphozoa, Cl. Hydrozoa
  A-mouth, B-gonad, C-mouth lobes, D-gastric pouch, E-radial canals, F-rhopalia
  Identify at least four differences between these two medusae.

• Metridium (dissection, 223K) Cl. Anthozoa; Or. Actinaria, a multitentaculate marine anemone;
  A-pharynx, B-siphonoglyph, C-tentacle, E-acontia, F-basal disk, G-gonad, H-septae with gonads

• Metridium (whole mount; 406K) Cl. Anthozoa; Or. Actinaria;
  A-siphonoglyph, B-oral disc, C-tentacles, D-body column, E-acontia, F-basal disc

• Pleurobrachia (whole mount, 67K) Ph. Ctenophora;
  A-comb rows; Why are these animals NOT considered Cnidaria? How do the tentacles capture prey? Where is the mouth?

Lab 4: Phylum Platyhelminthes

• Acoel flatworm (whole mount; 290K) "Cl. Turbellaria", Or. Acoela;
  A-mouth, B-eye spot, C-statocyst

• Leptoplana (whole mount; 106K) "Cl. Turbellaria", Or. Polycladida;
  A-gut diverticula (highly branched)

• Dugesia (cross section; 91K) "Cl. Turbellaria", Or. Tricladida;
  A-pharynx, B-gut diverticulum, C-mesenchyme

• Dugesia (whole mount; 87K) "Cl. Turbellaria", Or. Tricladida;
  arrows- gut diverticulum (tripartite)

• Dugesia (ventral view, cross section; 130K) "Cl. Turbellaria", Or. Tricladida;
  A-rhabdites in ventral ciliated epidermis, B-basal lamina, C-circular muscle, D-longitudinal muscle, E-gut diverticulum, F-mesenchyme

• Mesostoma (whole mount; 82K) "Cl. Turbellaria", "Or. Rhabdocoela";
  A-testis, B-Uterus; winter eggs , C-gut, D-mouth

• Polystoma (whole mount; 30K) Cl. Monogenea, monogenic fluke

• Polystoma (haptor; 38K) Cl. Monogenea
  attachment structure

• Clonorchis (whole mount; 93K) Cl. Trematoda, the liver fluke, a digenic fluke
  A-oral sucker, B-pharynx, C-esophagus, D-intestinal cecum, E-uterus, F-ovary, G-seminal receptacle, H-testis

• Schistosoma (male & female; 75K) Cl. Trematoda, the blood fluke, a digenic fluke
  A-mouth with oral sucker, B-ventral sucker, C-copulatory groove, D-female, E-male

• Trematode (miracidium larva; 42K)

• Trematode (redia larva; 46K)

• Trematode (cercaria larva; 31K)

• Taeniarhyncus (scolex; 43K) Cl. Cestoidea, a tapeworm;
  arrows- suckers

• Taenia (scolex; 44K) > Cl. Cestoidea, a tapeworm;
  A-suckers, B-hooks

• Taenia (mature proglottid; 109K) > Cl. Cestoidea, a tapeworm;
  A-genital pore, B-vas deferens, C-testis, D-vagina, E-ovary, F-uterus

• Taenia (gravid proglottid; 71K) > Cl. Cestoidea, a tapeworm;
  A-uterus, B-genital pore

• Taenia (gravid proglottid, higher power; 50K) > Cl. Cestoidea, a tapeworm;
  A-genital pore, B-vas deferens, C-uterus with eggs, D-vagina

• Tapeworm (hexacanth larva; 88K)> Cl. Cestoidea, a tapeworm;

• Bladder worm (whole mount & cross section; 111K) > Cl. Cestoidea, a tapeworm;
  A-cystecircus or bladder worm, B-muscle tissue

Lab 5: The Aschelminthes (Pseudocoelomates)

• Ascaris (egg, whole mount; 21K) Ph. Nematoda, a roundworm

• Ascaris (juvenile in lung, cross section; 45K) Ph. Nematoda, a roundworm;
  arrows- juvenile

• Ascaris (female cross section; 93K) Ph. Nematoda, a roundworm;
  A-cuticle, B-pseudocoelom, C-oviduct, D-ovary, E-uterus, F-longitudinal muscle

• Ascaris (female, dissection; 70K) Ph. Nematoda, a roundworm;
  A-pharynx, B-intestine, C-vagina, D-lateral cord (excretory pore/nerve cord), E-uteri, F-oviduct

• Ascaris (male & female, cross section; 119K) Ph. Nematoda, a roundworm;
  A-vas deferens, B-testis, C-intestine, D-ovary, E-uteri, F-oviduct

• Ascaris (male, cross section; 108K) Ph. Nematoda, a roundworm;
  A-longitudinal muscle, B-cuticle, C-intestine, D-vas deferens, E-testis, F-pseudocoelom

• Ascaris (male, dissection 75K) Ph. Nematoda, a roundworm;
  A-seminal vesicle, B-intestine, C-lateral cord (excretory duct/nerve cord), D-testis, E-vas deferens

• Ascaris (pharynx, cross section; 63K) Ph. Nematoda, a roundworm;
  A-lateral cord (excretory pore/nerve cord), B-longitudinal muscle, C-cuticle, D-ventral nerve cord, E-epidermis, F-dorsal nerve cord, G-pharynx, H-pseudocoelom

• Necator (juvenile, whole mount; 47K)Ph. Nematoda, a roundworm;

• Enterobius (female, whole mount; 36K)Ph. Nematoda, a roundworm- human pinworm

• Trichinella (in muscle; 60K) Nematoda, a roundworm- trichina worm

• Onchocerca (in connective tissue; 59K) Ph. Nematoda, a roundworm- human filarial worm;
  arrows- filarial worm embedded in cyst

• Nematomorpha (whole mount; 64K) Ph. Nematomorpha, horsehair worm

• Rotifer (whole mount; 48K) Ph. Rotifera, 'wheel-bearing worms'
  A-corona (also head), B-trunk, C-foot

• Acanthocephala (whole mount & head; 68K) Ph. Acanthocephala, spiny-headed worms

• Tardigrada (whole mount; 32K) Ph. Tardigrada, the water bears

Lab 6: Mollusca I: Gastropoda, Bivalvia

• Gastropoda (shell diversity, interior and exterior views; 78K) SubCl. Prosobranchia
  Only smallest shell displays sinistral coiling (it is also a Pulmonate!); the rest are dextrally coiled.
  A-columella, B-aperture, C-siphonal canal, D-apex and protoconch, E-body whorl, F-whorl, G-operculum

• Helix (whole mount; 96K) Ph. Mollusca, Cl. Gastropoda, SubCl. Pulmonata; a landsnail
  A-anterior tentacle, B-posterior tentacle, C-head, D-foot, E-shell, F-pneumostome surrounded by mantle edge (collar)

• Helix (dissection; 80K) Ph. Mollusca, Cl. Gastropoda, SubCl. Pulmonata;
  A-heart, B-penis, C-flagellum, D-dart sac, E-sperm duct, F-oviduct, G-albumen gland, H-digestive gland, I-stomach, J-crop, K-esophagus, L-buccal bulb

• Snail (radula; 76K) feeding structure from a landsnail (SubCl. Pulmonata)

• Bivalvia (shell diversity, exterior views; 47K) SubCl. Heterodonta;
  left panel- radial (upper) and concentric (lower) sculpture;
  right-panel: left image- shallow-burrower (short siphon, no gape), right image- deep burrower (long siphon, large gape)

• Bivalvia (shell diversity, interior views; 61K)
  A-Sub Cl. Pteriomorphia (Mytilus mussel; single large adductor muscle scar/ligament hinging valves), B-Sub Cl. Heterodonta (Mercenaria clam; hinge teeth/two roughly equal adductor muscle scars), C-Sub Cl. Pteriomorphia (Ostrea oyster; single large adductor muscle scar/ligament hinging valves)

• Mercenaria (whole mount; 71K) Ph. Mollusca, Cl. Bivalvia, SubCl. Heterodonta;
  A-mantle, B-anterior adductor muscle, C-labial palp, D-umbo, E-foot, F-demibranch, G-ligament, H-posterior foot retractor muscle, I-posterior adductor muscle, J-ctenidium, arrows in inset- excurrent (upper) and incurrent (lower) siphon

• Mercenaria (dissection; 91K) Ph. Mollusca, Cl. Bivalvia, SubCl. Heterodonta;
  A-mantle, B-umbo, C-cardinal teeth, D-labial palp, E-anterior adductor muscle, F-posterior adductor muscle, G-posterior foot retractor muscle, H-foot, I-gonad, J-digestive gland, K-stomach, L-intestine, M-pericardial cavity, N-heart, O-excurrent siphon, P-incurrent siphon

• Mercenaria (valve interior; 71K) Ph. Mollusca, Cl. Bivalvia, SubCl. Heterodonta;
  left valve, A-pallial sinus, B-pallial line, C-posterior adductor muscle scar, D-ligament, E-umbo, F-cardinal teeth, G-anterior adductor muscle scar

Lab 7: Mollusca II: Cephalopoda, Mollusc Diversity, Sipuncula

• Loligo (dissection, circulatory system; 110K) Cl. Cephalopoda, SubCl. Coleoidea, Or. Decapoda
  A-anterior vena cava, B-kidney, C-branchial heart, D-posterior vena cava, E-systemic heart, F-pen

• Loligo (dissection, digestive system; 118K) Cl. Cephalopoda, SubCl. Coleoidea, Or. Decapoda
  A-digestive gland, B-esophagus, C-buccal bulb, D-stomach, E-cecum, F-rectum, G-inc sac, H-jaws (mandibles), I-radula

• Loligo (dissection, female reproductive system; 88K) Cl. Cephalopoda, SubCl. Coleoidea, Or. Decapoda
  A-mantle, B-accessory nidamental gland, C-oviduct, D-oviducal gland, F-ovary, G-nidamental gland

• Loligo (dissection, male vs female; 96K) Cl. Cephalopoda, SubCl. Coleoidea, Or. Decapoda
  Most obvious is female (lower) has nidamental gland and highly granular gonad.
  A-arms, B-siphon (funnel), C-siphon retractor muscles, D-fin, E-mantle, F-tentacles, G-ctenidium

• Loligo (dissection, male reproductive system; 85K) Cl. Cephalopoda, SubCl. Coleoidea, Or. Decapoda
  A-penis, B-spermatophoric gland, C-spermatophoric sac, D-vas deferens, E-testis, G-stellate ganglion

• Mollusca (diversity; 99K)
  Clockwise starting at left: Cl. Polyplacophora (gumboot chiton); Cl. Gastropoda; Cl. Bivalvia, SubCl. Heterodonta; Cl. Scaphopoda (tusk shells); Cl. Cephalopoda, SubCl. Ammonoidea (extinct); Cl. Bivalvia, SubCl. Pteriomorphia (mussel); Cl. Polyplacophora (chiton); Cl. Gastropoda, SubCl. Prosobranchia (keyhole limpet)

• Nautilus (shell morphology; 96K) Cl. Cephalopoda, SubCl. Nautiloidea
  arrow- siphuncle

• Sipuncula (dissection; 71K) Ph. Sipuncula (peanut worms)
  A-metanephridia, B-retractor muscles C-intestine, D-introvert, E-tentacles, F-anus

Lab 8: Annelida

• Nereis (cross section; 93K) Cl. Polychaeta, "SubCl. Errantia"
  A-dorsal longitudinal muscle, B-circular muscle, C-parapodium, D-ventral longitudinal muscle, E-ventral nerve cord, F-ventral blood vessel, G-coelom, H-oblique muscle, I-dorsal blood vessel, J-intestine

• Nereis (dissection; 113K) Cl. Polychaeta, "SubCl. Errantia"
  A-pharynx, B-intestine, C-cirrus, D-palp, E-prostomium, F-peristomium, G-septum, H-ventral nerve cord, I-metanephridia

• Errantia diversity (whole mounts, 3 examples; 70K)Cl. Polychaeta, "SubCl. Errantia", nereid and scale worm
  Nereis: A-everted pharynx with jaws, B-prostomium, C-cirrus, D-peristomium, E-parapodia (identify the parts)

• Errantia diversity (dorsal and ventral view, 1 example; 63K) Cl. Polychaeta, "SubCl. Errantia", the sea mouse Aphrodite

• Sedentaria diversity (whole mount and tube, 1 example; 52K) Cl. Polychaeta, "SubCl. Sedentaria", the parchment-tube worm Chaetopterous

• Sedentaria diversity (whole mounts, 3 examples; 83K) Cl. Polychaeta, "SubCl. Sedentaria"
  From left to right: Arenicolidae (marine lugworm), Sabellidae (tube-dwelling feather-duster worms), Serpulida (tube-dwelling fan worms)

• Lumbricus (whole mount & cross section; 57K) Cl. Oligochaeta
  A-prostomium, B-clitellum, C-dorsal blood vessel, D-typhlosole, E-intestine, F-coelom, G-ventral blood vessel, H-ventral nerve cord

• Lumbricus (dissection; 96K) Cl. Oligochaeta (earthworm)
  A-pharynx, B-esophagus, C-seminal vesicle, D-seminal receptacle, E-calciferous gland, F-crop, G-gizzard, H-intestine, I-dorsal blood vessel, J-ventral nerve cord, K-metanephridium

• Leech (whole mount; 68K) Cl. Hirudinea
  A-anterior sucker, B-posterior sucker

Lab 9: Arthropoda: SubPhylum Crustacea

• Arthropod (limb types, larva; 39K)
  Nauplius larva; phyllopodous (top); stenopodous, Crustacea (middle); stenopodous, Insecta (bottom)

• Crayfish (whole mount, dorsal; 60K) Cl. Malacostraca, SubCl. Eumalacostraca, SupOr. Eucarida, Or. Decapoda
  Two tagmata (cephalothorax, abdomen), A-2nd antenna, B-1st antenna, C-rostrum, D-cheliped E to, G-pereiopods, H-uropod, I-abdomen, J-cephalothorax/carapace

• Crayfish (dissection, dorsal; 98K) Cl. Malacostraca, SubCl. Eumalacostraca, SupOr. Eucarida, Or. Decapoda
  A-green gland, B-heart, C-stomach/gastric mill

• Crayfish (dissection, lateral; 92K) Cl. Malacostraca, SubCl. Eumalacostraca, SupOr. Eucarida, Or. Decapoda
  A-heart, B-stomach/gastric mill, C-green gland, D-ventral nerve cord

• Crayfish (mouthparts; 92K)
  A-mandible, B-maxilla 1&2, C-maxilliped 1, D-maxilliped 2, E-maxilliped 3

• Crayfish (sexing; 87K) Cl. Malacostraca, SubCl. Eumalacostraca, SupOr. Eucarida, Or. Decapoda
  female (upper), B-pleopod;
  male (lower), A-gonopod (pleopod 1), B-pleopods (gonopod 2, pleopod 3)

• Daphnia (whole mount, lateral; 86K) Cl. Branchiopoda, Or. Cladocera (water flea)
  A-carapace, B-compound eye, C- 2nd antenna, D-thoracic limbs

• Crustacea (diversity-I, 3 examples; 69K) Cl. Branchiopoda;
  upper two- Or. Notostraca (tadpole shrimp); lower left- Or. Anostraca (fairy or brine shrimp); lower right- Or. Cladocera (water flea)

• Crustacea (diversity-II, 4 examples; 81K) Cl. Maxillopoda
  upper left- SubCl. Ostracoda (seed shrimp); middle right- SubCl. Cirripedia (gooseneck barnacle); middle left- SubCl. Cirripedia (acorn barnacle); lower left- SubCl. Copepoda (copepod)

• Crustacea (diversity-III, 3 examples; 92K)Cl. Malacostraca,
  top- SubCl. Hoplocarida (mantis shrimp);
  bottom left- SubCl. Eumalacostraca, SupOr. Peracarida, Or. Amphipoda (amphipod, includes scuds & beach hoppers);
  bottom right- SubCl. Eumalacostraca, SupOr. Peracarida, Or. Isopoda (isopod, includes pillbugs)

• Crustacea (diversity-IV, 5 examples; 62K) Cl. Malacostraca, SubCl. Eumalacostraca, SupOr. Eucarida
  middle left- Or. Euphausiacea (krill);
  upper left- Or. Decapoda (shrimp);
  middle- Or. Decapoda (true crab, Infraorder Brachyura);
  upper right- Or. Decapoda (hermit crab, Infraorder Anomura);
  bottom- Or. Decapoda (true crab, Infraorder Brachyura)

Lab 10: Arthropoda: Relatives & Other Subphyla

• Peripatus (whole mount, ventral; 79K) Ph. Onychophora (velvet worms)

• Sea spider (whole mount, dorsal; 46K) SubPh. Chelicerata, Cl. Pycnogonida

• Arthropoda (diversity-I, 3 examples; 70K) SubPh. Chelicerata, Cl. Arachnida
  left- spider (Or. Araneae);
  upper right- scorpion (Or. Scorpiones);
  lower right- tick (Or. Acari, the mites)

• Limulus (whole mount, dorsal & ventral; 72K) SubPh. Chelicerata, Cl. Merostomata (horseshoe crab)

• Trilobite (whole mount, dorsal; 64K) Ph. Arthropoda, SubPh. Trilobitomorpha (trilobites, extinct)

• Millipede & centipede (whole mounts, dorsal; 64K) SubPh. Uniramia, SuperCl. Myriapoda, Cl. Diplopoda (millipede, upper), Cl. Chilopoda (centipede, lower)

• Arthropoda (diversity-II, 4 examples; 89K)

• Arthropoda (diversity-III, 5 examples; 102K)

Lab 11: Deuterostomia

Echinoderms

• Sea lily (whole mount; 27K) Ph. Echinodermata, Cl. Crinoidea;
  A-cirri, B-arm, C-pinnules

• Sea star (whole mount, pedicellaria & larva; 101K) Ph. Echinodermata, Cl. Asteroidea;
  Aboral surface; A-madreporite, B-pedicellaria, C-bipinnaria larva

• Sea star (whole mount; 73K) Ph. Echinodermata, Cl. Asteroidea;
  Oral surface; A-periostomial membrane, B-mouth, C-tube feet D&E-ambulacral groove

• Sea star (cross section, arm; 79K) Ph. Echinodermata, Cl. Asteroidea;
  A-ampulla, B-tube foot, C-coelom, D-spines, E-ossicles, F-dermal branchia

• Sea star (cross section; 71K) Ph. Echinodermata, Cl. Asteroidea;
  A-ossicles, B-dermal branchiae, C-spines

• Sea star (dissection, aboral; 114K) Ph. Echinodermata, Cl. Asteroidea;
  A-pyloric cecae, B-gonad, C-cardiac stomach, D-pyloric stomach, E-intestinal cecum, F-stone canal, G-madreporite

• Sea star (dissection, lateral; 104K) Ph. Echinodermata, Cl. Asteroidea;
  A-digestive gland, B-gonad, C-cardiac stomach, D-pyloric stomach or cecum, E-intestinal cecum

• Sea star (dissection, water-vascular system; 109K) Ph. Echinodermata, Cl. Asteroidea;
  A-madreporite, B-stone canal, C-polian vesicles, D-ampullae

• Gorgonocephalus (whole mount; 54K) Ph. Echinodermata, Cl. Ophiuroidea (brittle stars)

• Heart urchin (whole mount & larva; 67K) Ph. Echinodermata, Cl. Echinoidea (this is an 'irregular' echinoid)
  A-pluteus larva

• Sea cucumber (dissection; 73K) Ph. Echinodermata, Cl. Holothuroidea;
  A-tentacles, B-mouth, C-ring canal, D-stomach, E-gonoduct, F-respiratory tree, G-cloaca, H-gonad, I-intestine, J-polian vesicle, K-pharynx

• Echinoderm (diversity, 9 examples; 76K) Ph. Echinodermata;
  1- Cl. Asteroidea (starfish); 2- Cl. Ophiuroidea (brittle stars); 3- Cl. Holothuroidea (sea cucumbers); 4- Cl. Echinoidea (regular urchins); 5- Cl. Echinoidea (irregular urchins; heart urchin (left) & sand dollar (right))
  A-dorsal, B-ventral

• Lamp shells (diversity & dissection; 99K) Ph. Brachiopoda
  left panel: left- Cl. Inarticulata, right- Cl. Articulata, outside view of ventral & dorsal valves (top two) and inside view (bottom two- with lophophore (upper) and gonad (lower))
  right panel: Cl. Articulata, close-up interior view of ventral valve (with gonads, top) and dorsal valve (with lophophore, bottom)

• Lamp shell (face view; laminar flow through living animal; 20K) Ph. Brachiopoda, Cl. Articulata;
  (note how the water flow through the mantle cavity is totally laminar; even though it has passed through the lophophore and made a nearly 120 degree turn, the dye stream exits almost as crisply as it enters the mantle cavity)
  A- dorsal valve
  B- ventral valve
  C- lophophore

• Moss animals (whole mount; 114K) Ph. Bryozoa;
  A-lophophore

• Balanoglossus (whole mount, dorsal; 37K) Ph. Hemichordata; Cl. Enteropneusta (acorn worms);
  A-collar, B-proboscis

• Sea quirts (whole mount, dissection & larva; 77K) Ph. Chordata, SubPh. Urochordata. Cl. Ascidiacea (sea squirt)
  upper left- branchial basket inside translucent tunic; upper right- tadpole larva; bottom two- benthic sea squirt with branchial basket exposed (left) or outer tunic intact (right)

• Lancelet (whole mount; 113K) also known as amphioxus; Ph. Chordata, SubPh. Cephalochordata

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