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Home >> Glossary Download Options Download Options Primary language will be language selected to the left. Single Language Include Images Translation Table Translations Dutch English French German Hebrew Italian Japanese Korean Portuguese Russian Spanish Thai Without Definitions Primary Definition Only All Definitions Search/Browse Glossary Taxonomic Group: Language: Search Term: Search within definitions Terms in English (Display Sources) Contributors for Taxonomic Group Terms and Definitions contributed by: Estefania Rodriguez - American Museum of Natural History Images contributed by: Estefania Rodriguez - American Museum of Natural History; Meghan Rock Translations by: Estefania Rodriguez - American Museum of Natural History (Spanish) Translations and images were also sourced from the following references: Carlgren O (1949) A Survey of the Ptychodactiaria, Corallimorpharia and Actiniaria. Vol. 1, no. 1. K. Svenska Vetenskapsakad. Handl. Häussermann V & Försterra G (Eds) (2009). Marine Benthic Fauna of Chilean Patagonia. Santiago, Nature in Focus, pp. 1000 "Walking legs" 1st Antenna (A1) 2nd Antenna (A2) 4th limb 5th limb 6th limb 7th limb Abaxial Abaxial Abcauline Abdomen Acantho Acanthophore Acanthostyle Acanthozooid Accessory flagellum Accessory openings Accessory spicule Accessory stylet sacs Accretive reticulation Acerate spicule Acnide Tentacle Acochlidiaceans Acontioid Acontium (pl. acontia) Acraspedote Acrocyst Acropetal Acrorhagus (pl. acrorhagi) Acrosphere Acrospheres Actine ray Actinocyte Actinopharynx Actinula Acute Adaxial Adaxial Adcauline Adductor muscle scar pattern (AMS) Adherent rugae Adhesive organs (larvae) Adhesive Pad Adhesive papillae (larvae) Adnate Adont Adradial Adventitious Aeolidiform Aeolids Aequiramous aesthetasc Agglutinated support (agglutinating) Ala Allomones Alternate Alternate Alternation of generations Alveolate skeleton Amararhysis Ambucinate Amorphous Amphiaster Amphiblastula Amphicoronate Amphidisc Amphidont Amphitriaene Amphitrider Ampulla Ampulla Ampullae (adult) Ampullae (larvae) Anal opening Anaspideans Anastomosing Anastomosing Anastomosing Anatriaene Anaxial desma Anchor Anchorate chela Angulate spicule Aniso- Anisochela Anisotropic skeleton Annulate Annulation Annulus Anterior Anterior cephalic furrows Anterior pole Anthaster Antho- Anthosigma Anticlinal Antimerodont Antineoplastic Antitumour Anus Anus Aperture Apex Aphodal Aphodus Apical Apical Apical Apical actine (ray) Apical Knob or Chamber Apical or Umbilical Canal Apical orifice Apical Projection Apical Wings Apiculate Apochete Apophysis Apopinacocyte Apopinacoderm Apopylar cell Apopyle Aporhysis Aposematic Appendage Aquiferous system Arborescent Arborescent Arborescent Archaeocyte Arcuate chela Areolated surface Article Articulate skeleton Ascending limb of gut loop Ascending limb of gut loop (colonial ascidian) Ascending limb of gut loop (solitary ascidian) Asconoid Asconoid sponge Aspidaster Aspidoplumicome Aster Astroclone Astrorhiza Asymmetric megasclere Athecate Atrial apperture Atrial cavity Atrial languet Atrial siphon Atrial skeleton Atrial tentacles Auriculate Autodermalia Autogastralia Autotomize Auxiliary cell Axial filament Axial skeleton Axinellid skeleton Axis Bacteriocyte Bark Basal Lamella Basal Space Basal spongin plate Basal triradiate system Basal Web Basalia Basidictyonal plate Basigaster Basilar muscles Basipetal Basis Basis Basis Basitrich Basopinacocyte Batesian mimicry Bell Bellonci organ (BO) Beveled Bicoronate Bicuspidate Bifid Bifid or bifurcate Bilabiate Bimucronate Bipinnate Bipocillum Birotula Biseriate Bladder Bladder cells Blade Blastostyle Blastozooid Blastula Bleached Blind Canal Blood gland Blunt megasclere Body wall Bouquet Brachyome Bract Brain Branch Branchial aperture (= opening or orifice) Branchial basket Branchial fold Branchial formulae Branchial leaves Branchial opening Branchial orifice Branchial papillae Branchial plate (BP) Branchial sac Branchial siphon Branchial tentacles Branching Branchlet Brood Chamber Brood pouch Brood pouch Brush-shaped organs Buccal Buccal mass Bud Bud Budding Budding Bugle Bulb Bulloid Bushy Butt Button comb Caecum Caecum Calcareous Calcareous Calcareous spicule Calcareous spicules Calcareous tripod Calceolus Calcified inner lamella Caliculate Callynophore Calthrop Calycocome Campanopsid Campanulate Campanuliform Campanulinid Canalaria Canaliculated Candelabrum Canonochela Capitate Capitulum Capsule Carapace Carcinoecium Cardiac area Carina Carpochelate Carpogonium Carposporangium Carpospores Carposporophyte Carpus Carrier cell Cartilaginous Caryophyllidia Catch tentacle Cateniform Cathamnal Lamella Caudal cirrus Caudal process Caulus Cellules en croix Cemented spicule Central cell Central Organ Centrifugal Canal Centripetal Canal Centrotriaene Centrotylote Cephalaspideans Cephalic Cephalic furrows Cephalic grooves Cephalic shield Cephalic slits Ceras Cerebral ganglia Cerebral organ furrows Cerebral organs Cerebral sensory organs Cerebral vesicle Cervicorn Chamber Cheek Chela Chela Chelate Cheval-De-Frise Chiactine Chiastoclone Chiastosigma Chitinous Chloroplast Choanoblast Choanochamber Choanocyte Choanocyte chamber Choanocyte-lined chamber Choanoderm Choanoskeleton Choanosomal skeleton Choanosome Chordal Chordoid Choristid megasclere arrangement Chromodorid Cilia Ciliated groove Cinclides Cinctoblastula Circlet Circular Canal Circular muscles Circumscribed Cirrus Clad Cladium Cladome Cladotylote Clasp Clathrate Clathrate skeleton Clathriid skeleton Clavate Clavate Clavate, Claviform Clavidisc microsclere Clavule Claw, Claw-like Cleistochela Cleptocnidae Cloaca Cloacal aperture Cloacal canal Cloacal cavity Cloacal languet Clone Clump Cnida (pl. cnidae) Cnidae Cnidoband Cnidoblasts Cnidocil Cnidocyst Cnidocyst Capsule Cnidocyst Marginal Ring Cnidocyte Cnidome Cnidome Cnidophore Cnidosacs Cnidosacs Cnidothylacium Codonhexactin Coelenteron Coeloblastula Coenocytic Coenosarc Coenosteum Coenosteum Collagen fascicle Collar body Collencyte Colonial ascidian Colony Colony Columella Column Column Column Columnar Comitalia Comma Commissural Canals Compound ascidian Compound fiber Compound Sense Organ Compressed Compressible Conceptacle Conchicolous Conchula Confused skeleton Congeneric Conical megasclere Conjoint Conspecific Conulose surface Coppinia Copulatory limbs (CP) Coralline Corallite (= calyx) Corallum Corbula Corbulacosta Cordylus Cored fiber Corm Cormidium Cormoid Corneal lens Corrugated surface Cortex Cortex Cortical Cortical skeleton Cortical spicule Corticated Corticating Cortication Coxa Coxa Craspedote Crateriform Crenulated Crenulated Crepis Cri- Croca Crosswall Cruciate Cruciform Crumpling Crustose Crypt tissue Cryptic coloration Cryptobranch Cryptomedusoid Crystal ultrastructure Ctenidium Curved Cusp Cuspidellid Cuticular lens Cyclosystem Cymba Cymose Cyrtancistra Cyst Cystencyte Cystocarp Cystocarpic Dactylopore Dactylostyle Dactylotome Dactylozooid Dactylus Deciduous Decumbent Decussate Dendritic skeleton Dendroclone Dendroreticulate fiber skeleton Dentate Dentate Dermalia Descending limb of gut loop (colonial ascidians) Descending limb of gut loop (solitary ascidians) Desma Desmocyte Determinate Deterrent chemicals Deuteroclad Diact Diactin Diactine Diaene Diancistra Diapason Diaphragm Diarhysis Dichotomous Dichotomously branched Dichotomy Dichotriaene Dicranoclone Dictyonal skeleton (= dictyonine) Dictyonalia Didiscorhabd Diffuse Digestive gland Digestive gland Digestive tract Digitate Digitiform Diod spicule Diplaster Diploblastic Diplodal Direct Development Directives, directive mesenteries Discaster Dischela Discoctaster Discohexactin Discohexaster Discorhabd Discotriaene Dispariramous Distal Distal Distal Distal Distal Domicilium Dorid Doridiform Dorsal Dorsal lamina Dorsal languets Dorsal tubercle Dorsiventral Dorsum Drepanocome Echinating spicule Ecorticate Ecto-Endodermal Ocelli Ecto-Endodermal Statocyst Ecto-Theca Ectochrote Ectoderm Ectoderm Ectodermal ampullae (larvae) Ectodermal Lamella Ectodermal Lamina Ectodermal Statocyst Ectodermal vesicles (larvae) Ectosomal skeleton Ectosome Egestion Egg Egg mass Elastic Elongate urosomite Emarginate Embryo Embryo Encapsulate Encrusted substrate Endite Endocarp Endocoel Endoderm Endoderm Endolithic Endolithic Endophytic Endopinacocyte Endopinacoderm Endopod/Endopodite (EN) Endopsammic Endosomal_skeleton Endosome Endostyle Endozoic Entire Entire Entocodon Entomodont Entrapped spicules Eosinophilic cell Epicardium Epidermis Epilithic Epilithic Epimeron Epiphytic Epipod (EP) Epirhabd Epirhysis epistome Epistome Epitheca Epithelium Epixylous Epizoic Equal megasclere Erect Esophageal neck Esophageal opening Esophagus Esophagus entrance Euaster Eudoxid Eumedusoid Eurypylous Eusirid gnathopods Euthyneura Excavating Excretionary Papillae Excretory Pore Excretory vesicles Excurrent siphon Exhalant canal Exhalant system Exocoel Exopinacocyte Exopod/Exopodite (EX) Exotyle Extra-axial skeleton Extra-branchial appendages Extra-rhinophoral appendages Exumbrella Exumbrellar Cnidocyst Band Exumbrellar Cnidocyst Cluster or Band Exumbrellar Spur Facial plane Falcate Fascicle Fascicled Fascicular fibrous microstructure Fasciculate Fiber Fibroreticulate Fibule Ficiform Fighting tentacle Filament Filamentous/Filiform Filiform Filling (tissue) structure Fimbria Firm Fistule Fistulose Fixative appendage Flabellate Flabellate Flabellate Flagelliform Flagellum Flagellum Fleshy Flexile Cirri Flexuose Flexuous spicule Floricome Fold Foliaceous Foliaceous Foliose Follicle cell Foot Foot corner Foramen Forceps Fosse Fossorial Fragile Fragmentation Free actine Free margin Friable Frond Frustule Fuchsinophilic cell Funnel Furca(e) (F) Fusiform Fusiform spicule Galeate Gametangium Gametogenic tissue Gametophyte Gastralia Gastric caecum Gastric Cavity Gastric Peduncle Gastric Pouches Gastric reservoir Gastrodermis Gastrointestinal gland Gastropod Gastropore Gastrostome Gastrovascular cavity Gastrovascular System Gastrozooid Gemmiparous larva Gemmule Gemmule Geniculate Geniculum/genicula Genus Gill Gill slits Gills Gizzard Globoferous cell Globular Glockenkern Glomulus Glutinous Glycocyte Gnathopod Gonad Gonads Gonangium (Gonangia) Gongylodont Gonimoblast Gonochoric gonad Gonodendron Gonoduct Gonoduct Gonophoral Polyp Gonophore Gonopore Gonosome Gonotheca Gonozooid Graphicome Gray cell Grooved Gut Gut loop Habit Haemocoel Halichondrioid skeleton Hancock’s organs Hard Hastate Head Heart Heloclone Hemiamphidont Hemioxyhexaster Hemipenes (HP) Hepatic Hepatic gland Hermaphrodite Hermaphrodite gonad Hermaphroditic Heteromedusoid Heteromerous Segmentation Heteromorphic Heterotrichous Hexactin Hexadisc Hexaster Hilum Hinge Hinge Joint Hispid surface Hispidation Holamphidont Holdfast Hollow Tentacle Holomerodont Holotrich Homogeneous fiber Homomerous Segmentation Honeycombed surface Hyaline Hydranth Hydrocaulus Hydrocladia Hydroecium Hydroid Hydrophore Hydropore Hydrorhiza Hydrotheca Hydrotheca Reduction Hymedesmioid skeleton Hypocystic Villus Hypodermalia Hypodermic fecundation Hypogastralia Hypogynous cell Hypostome Hypostome Hypothallus/hypothallium Imbricate Imperfect mesenteries Inarticulate skeleton Incisor Incisur Incompressible Incrassate Incubatory pouch Incurrent siphon Indeterminate Infundibula Infundibuliform Inhalant canal Inhalant system Inner lamella Inner margin Inter-rhinophoral crest (caruncule) Intermedia Intermediate branchial papillae Internode Interradial Interstitial spicule Intertentacular Web Intestinal curvature Intestinal loop Intestinal swelling Intestine Intracellular pore Intrathecal Ridge Intrathecal Septum Introversion Involucre Involucrum Involute Irciniid filament Iridescent Irregular microstructure Ischium Iso- Isochela Isodictyal reticulation Isomorphic Isotropic reticulation Keel (K) Kidney Labial Labial cuticle Labium Lacerate / Laciniate Lacinia mobilis Lamella Lamellate Lamellate Lamina Lamina Laminated fiber Lanceolate Lappet Larva Larva (pl. Larvae) Larval tail Larval trunk Larval vesicles Lateral Cirri Lateral eye (LE) Lateral Nematothecae Lateral organ Lateral Ridges Lateral sense organ Latilamina Lax (= loose, vague) skeleton Lecithotrophic Leuconoid sponge Leuconoid system Light organ Ligula Ligulate Limbus Limp Limpet Line of concrescence Line of spicules Linear Linked spicules Lip Lip Lipo- Lipostomous surface Lithistid skeleton Littoral Liver diverticula Lobate Lobe Locule Locule Longitudinal muscles Longitudinal vessels Lophocalthrop Lophocome (= lophodiscohexaster) Lophocyte Lophodont Lower lip Lychnisc Lychnisca Lyssacine Macrobasic p-amastigophore Macrobasic p-mastigophore Macrocnemes Macroscopic Mamelon Mamelon Mammilate Mandible Mandible (md) Mantle Mantle Mantle Mantle Canal Mantle glands Manubrial Pouch Manubrial or Gastric Cavity Manubrial Pocket Manubrium Margin Margin Marginal Marginal Bulbs Marginal Cirri Marginal Cnidocyst Ring Marginal Lappet Marginal sphincter muscle Marginal Swelling Marginal Tentacle Marginal Vesicle Marginal Wart Marginalia Marsupium Massive Maxilla 1 Maxilla 2 Maxilliped Median Median Nematothecae Medulla Medullary Medusa Medusa Budding Medusa Reduction Medusary Nodule Megaclone Megarhizoclone Megasclere Meiosporangium Membranous Meristem Merochelate Merodont Merus Mesenterial arrangement Mesenterial filament Mesentery Mesentery (pl. mesenteries) Mesh Mesial Nematothecae Mesoglea Mesogloea Mesohyl Mesolamella Mesotriaene Mesotrider Metaster Micro- Microanchor Microbasic b-mastigophore Microbasic p-amastigophore Microbasic p-mastigophore Microcionid Microcnemes Microdiactin spicule Microgranular cell Microgranular microstructure Microhexactin Microholactin Microlamellar microstructure Micropyle Microrhabd Microsclere Microstrongyle Microstructure Microsymbiont Mimetism or Mullerian color Modular Molar Monact Monaene Monaxon Monilifiliform Moniliform Moniliform Monoecious Monopodial Monosiphonous Monostiliferan proboscis armature Mouth Mouth Mouth Arm Mouth Plate Mucronate Mucronate megasclere Multiaxial Multiseriate Multispicular fiber Muscle bands Muscle bundles Muscle fibers Muscular appendage Muscular process Myocyte Naupliar eye (NE) Neck furrow(s) Neck Shield Nectophore Nectosac Nectosome Needle-like biradiate Nemathecium Nemathybome Nematocladium Nematocyst Nematodactyl Nematophore Nematopore Nematotheca Nerve Ring Nettle Ring Neural complex Neural duct Neural ganglion Neural gland Node Node Non-Tentacular Marginal Bulb Normal pore canals Notal Notched Notum Nudibranchs Nurse cell Oblate Obtuse Ocellus Ocellus (pl. ocelli) Octactin Octant Octaster Odontophore Oesophageal neck Oesophageal opening Oesophagus Olynthus stage Ommatidia Onychaete Onychaster Oostegites Oozooid Operculum Opistobranch Opposite Opposite Optic axis Oral Oral aperture Oral disc Oral lobes Oral Tentacle Oral tentacles Oral tentacles Oral veil Orthodiactin Orthogonal microstructure Orthotriaene Osculum Osphradium Ostiole Ostium Ostium Otolith Otolith Otoporpae Outer lamella Ovary Ovate Oviduct Oviparity Ovotestis Oxea Oxy- Oxyaster Paedomorphosis Paedophore Paired actine Palisade Pallial Canal Pallial gonoduct Palm Palmate Palmate Palmate Palmate chela Palp Palp Palpacle Palpon Papilla Papilla Papillae (Dorsal lamina) Papillae (pharyngeal transverse vessels) Papillae (prepharyngeal area) Papillate surface Papillated Pappocome Parachelate Paraphyses Parapodia Parasagittal spicule Parasite Parastigmatic vessels Paratangential skeleton Parchment Parenchymalia Parenchymella Parietobasilar muscles Patelliform Paucispicular fiber Pedal disc Pedal gland Pedicel Pedicle Pedicular Canal Peduncle Peduncle Pedunculate Peduncule Peltate Penial spine Penis Pentactin Pentodont Pereon Pereopod Perfect mesenteries Perfoliate Perforate Peribranchial cavity Pericardium Pericarp Pericentral cells Periclinal Periderm Periostracum Peripharyngeal band Peripheral Canal Peripheral Canal System Perisarc Perithallium Peritubercular area Peronia Peronial Canal Perradial Petra Phagocytosis Phanerobranch Pharyngeal basket Pharyngeal fold Pharynx Photolith Phylactocarps Phylactogonium Phyllidiid Phyllotriaene Physa Pilidium Pillar Pinacocyte Pinacoderm Pinnate Pinnate Pinnate Pinnule Pinule Pit connection Pith Pithed fiber Placochela Plagiotriaene Plankton Planktotrophic development Planula Planuliform larva Platy Pleon Pleopod Plesiaster Pleuralia Pleurobranchomorph opisthobranchs Plumes Plumoreticulate skeleton Plumose Plumose skeleton Plurilocular Pluriseriate Pneumadenia Pneumatocodon Pneumatocyst Pneumatophore Pneumatosaccus Pocket cell Podocyst Podomere Polygastric Stage Polymorphic Polymorphic Polyp Polysiphonic Polysiphonous Polystiliferan proboscis armature Polystromatic Polytylote megasclere Pore groove Pore sieve Porocalyx Porocyte Postabdomen Posterior Posterior abdomen Posterior cephalic furrow(s) Posterior pole Posterior stomach Posticum Prebranchial area Prebranchial groove Prehensile Prepharyngeal area Prepharyngeal groove Prestomach Primary calcareous skeleton Primary fiber Primary gut loop Primary papillae Primary Polyp Primary spicule Primary spicule framework Principalia Proboscis Proboscis armature Proboscis pore Proboscis regions (chambers) Proboscis sheath Procarp/Procarpy Processes Progenesis Prolate Propodial tentacles Propodus Prosochete Prosodus Prosopinacocyte Prosopinacoderm Prosopyle Prostagladins Prostalia Prostatic gland Prostrate Protoclad Protoconch Protopod (pro) Protorhabd Protriaene Proximal Proximal Proximal Proximal Proximal Pseudoacrorhagus (pl. pseudoacrorhagi) Pseudocalyx Pseudofiliform Pseudogemmule Pseudohydrotheca Pseudoparenchymatous Pseudosagittal spicule Pseudosepta Ptychocyst Punctate surface Punctured Pycnaster Pyloric gland Pyrenoid Pyriform Quadrant Quadrate Quadripinnate Rachis Radial Radial Canal Radial pore canals Radiate skeleton Radula Raker spine Ramified Capitate Raphide Rastrum Rectal valve Rectum Reduction body Regular spicule Renal sac Renal vesicle Reno-pericardial canal Reno-pericardial syrinx Repent Repent Resilient Rete Reticulate Reticulate skeleton Retractor muscle Retractor muscle Retropharyngeal groove Rhabd Rhabdiferous cell Rhabdodiactin Rhabdome Rhabdostyle Rhagon stage Rhinophore Rhizine Rhizocaulomic Rhizoclone Rhizoid Rhizoid Rhizoid projections Rhizoidal Rhizomatous Rhynchocoel Rhynchopore Rhynchostomopore Ribbed surface Rigid aspicular skeleton Rigid spicular skeleton Ring Canal Ring Palisade Rooted Rostrum Rows of stigmata Rubbery Rudimentary Bulb Rugose surface Saccate Sacoglossans Sagittal spicule Sail Sanidaster Sarcopore Sarcostyle Sarule Saxicolous Scale Scapulus Scapus Scapus Scepter Sceptrule Schizodont Schizorhysis Sclerite Sclerocyte Sclerodermite Scopule Scutum Secondary calcareous skeleton Secondary fiber Secondary furrows Secondary loop Secondary metabolites Secondary openings Secondary papillae Secund Segment Selenaster SEM Semifiliform Semimoniliform Sensorial vesicle Sensory Club Septate Septum Serrate Sessile Sessile Seta Shaft Side organ Sieve plate Sigma Sigmaspire Sigmatocome Silicatein Simple Simple ascidian Siphon Siphon Siphon lobes Siphonal lining Siphonal scales Siphonal spines Siphonoglyph Siphonous Siphons Siphosome Size class Skeleton Smoking Smooth surface Soft Solid Tentacle Solitary ascidian Somatocyst Sorus Spadix Spathulate Spatulate Spatuliferous-anchorate chela Sperm duct Spermatangium Spermatium (Pl. = spermatia) Spermatophore Spermatozoid Spermiocyst Sphaerancora Sphaeroclone Sphaerohexactin (sphaerohexact) Sphaerohexaster Spheraster Spheroxyaster Spherule Spherulitic microstructure Spherulous cell Sphincter Sphincter muscles Spiculation Spicule Spicule center Spicule ray Spicules Spicules Spiculoid spicule Spine Spine Spined Spines Spinneret gland Spiny surface Spiral Spiral Cirrus (Cirri) Spiral Zooid Spiraster (= spinispira) Spire Spirocyst Spirodiscohexaster Spongeocoel Spongin Spongocyte Sporangium Spore Sporophyte Sporosac Spur Canal Stalk Statoblast Statocyst Statocyst Statocyst Statocyte Statolith=Otolith Stauractin Stauraster Stellate Stem Stepped megasclere Sterile cells or sterile cell group Sterraster Sterrospheraster Stigmata Stinging Cell Stipitate Stipitate Stolon Stolon Stolon Stolonal Colonies Stolonic vessel Stoloniferous Stoma (pl. stomata) Stomach Stomach stomach fold Stomoblastula stage Stomodeum Storage cells Straight Streptaster Stria Striated Muscle Strobiloplumicome Strongylaster (= chiaster) Strongyle Strongyloxea Style Style Stylet Styloid Sporosac Subapical Subapical cells Subatrial spicule Subchelate Subcortical spicule Subdermal spicule Subepithelial glands Subhypogynous cells Sublithistid skeleton Subovate Subsidiary cells Subtylostyle Subumbrella Subumbrellar Cavity Subumbrellar Surface Sucker Sucker Sulcate Supporting Cell Suprabasal cells Suture Swimming Gonophore Swimming Sporosac Syconoid Syconoid sponge Sylleibid Symbiont Symmetrical megasclere Sympodial Synapticule System of zooids Tabula Tabulae Tabulate osculum Tadpole Tail Tangential skeleton Tangential spicule Tauactin Telson Tenaculum (pl. Tenaculi) Tentacle Tentacle Tentaculae Tentacular Marginal Bulb Tentacular Root Tentaculiform Structure Tentaculocyst Tentaculozooid Tentilla Terete Terminal ampullae (adults) Terpenoids Tertiary fiber Test Test vessels Testis Testis (pl. Testes) Testis follicle Tetrachotomous Tetraclone Tetractin Tetractine Tetradisc Tetrapocillum Tetrasporangium Tetraspore Tetrasporophyte Thallus (Pl. thalli) Thaumatochela Theca Thecate Thesocyte Thorax Thraustoxa Thread Thrust Block Tignule Tornote Tough Toxa Trabecula Trabecular tissue Tract Transverse Transverse muscles Transverse pharyngeal muscles Transverse vessels Triactin Triactine Triaene Triaxone Trichaster Trichimella Trichoblast Trichocyte Trichodragma Trichogyne Trichothallic Trichotomous Trichotriaene Trichox Tridentate chela Trider Trifurcate Trimerous Triod Tripinnate Tripod Triturative Trophocyte Trophosome Truncaster Truncate Tubercle Tubercle Tuberculate spicule Tubular Tubule Tuburculate Tunic Tunic vessels Turbinate Turflike Tylaster Tyle Tylostyle Tylote Umbilical Canal Umbilicus Umbrella Umbrellula Uncinate Undulate Unguiform Uniaxial Unilateral Unilocular Unipinnate Uniseriate Unispicular fiber, tract Unpaired actine Upper lip Urceolate Uropod Urosome Utricle Valve Vanadocytes Vas deferens Vascular stolon Vasiform Veil or velum Velar Velar appendages Velar Ridge Velum Velum Ventral Veronica Verruca (pl. verrucae) Verrucose Verticillate Verticillate Verticillated acanthostyle Vesicle Vesicle Vesicular Vestibule Vestibule Vibratory Plate Villous Viscera Viviparity Whorl Whorled Zenker's organ Zonate Zone of concrescence Zooid Zooid Zooid Zooidangium Zooids Zoosporangium Zoospore Zooxanthellae Zooxanthellae Zygome Zygosis Zygote
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