Table 1. Terminology used for enteric phagocytes and their organelles.

Information tabulated here is taken from a comprehensive, yet non-exhaustive survey of published electron microscopic studies of the ultrastructure of invertebrate digestive systems. Columns A and B list animal clades. Column C indicates terms used for enteric phagocyte in corresponding animal clade. The term used for enteric phagocytes varies, often simply referring to the function (e.g., absorptive cell, digestive cell) or position (e.g., stomach cell, midgut cell) of the cell. Columns D-F show terms used for organelles associated with enteric phagocytes. The three columns reflect the position of the corresponding organelles along the apical-basal axis, with those referring to the apical membrane and its immediate vicinity placed in column D (yellow), the ones naming organelles in the supra/perinuclear space in column E (orange), and the ones referring to more basal structures in column F (purple). Based on this topology, structures referred to in column D would most likely correspond to pinocytotic/phagocytotic membrane specializations, primary endocytic vesicles/phagosomes and early endosomes; structures of column E to late endosomes, lysosomes and endolysosomes/phagolysosomes, and structures in column F to residual bodies and storage organelles. Column G indicates types of particles or cells used experimentally to ascertain phagocytosis. Literature is provided in column H.

Abbreviations: Ap. Apical; Cil. Ciliated; Col. Columnar; Endocyt. Endocytotic; Glyc. Glycogen particle; Incl. Inclusion; Intest. Intestinal; Multives. Multivesicular; Pinocyt. Pinocytotic; Prim. Primary; Resid. Residual; Sec. Secondary; Spher. Spherical; Vac. Vacuole; Ves. Vesicle

Clade	Subclade	Term for Cell	Membrane/Apical	Supranuclear/Perinuclear	Basal	Exp. Feeding	Reference
Porifera	Demospongiae	Choanocyte	Lamellipodia	Phagosome, Food Vac., Lysosome		Bacteria	1, 2
	Demospongiae	Choanocyte	Small Ves.	Phagosome, Lysosome-like Ves.	Microvesicles		3
	Calcarea	Choanocyte	Lamellipodia	Phagosome		Bead 1μm	4
	Homoscleromorpha	Choanocyte		Phagosome			5
Ctenophora		Digestive Cell	Ves.	Phagosome, Lysosome, Lysosome-like Body		Thorotrast	6, 7
Cnidaria	Anthozoa	Phagocytic Cell	Pinocytic Ves.	Phagosome, Postphagosome, Lysosome	Wax Droplets, Glyc.		8
	Cubozoa	Absorptive Cell	Apical Discoideal Coated Ves.	Watery Vac., Phagosome, Lysosome	Lipid Droplets		9
	Hydrozoa	Gastrodermal Cell		Food Vac.			10
	Hydrozoa	Absorptive Cell	Discoideal Flattened Ves.			Ferritin	11
	Hydrozoa	Gastrodermal Cell	Flatttened Coated Ves.	Large Vac.		Carbon part.	12
	Hydrozoa	Nutritive Phagocyte	Pinocyt. Ves., Microves.	Phagosome, Sec. Lysosome		Carbon part.	13, 14
Echinodermata	Asteroidea	Enterocyte	Pinocyt. Vac.	Vac.			15, 16
	Asteroidea	Choanocyte-like Cell	Coated Ves.	Phagosome, Multives. Body, Sec. Lysosome			17
	Ophiuroidea	Enterocyte	Pinocyt. Invagination, Ves.		Lipid Droplets, Glyc.		18
Hemichordata		Absorptive Phase Cell	Apical Coated Pit, Ves.	Heteromorphic Incl. Body, Digestive Vac.			19, 20
	Pterobranchia	Epithelial Cell	Apical Coated Pit, Coated Ves.	Multives. Body, Heteromorphic Vac. Body			21
Urochordata		Absorptive Cell	Coated Pit, Small Ves., Pinosome	Multives. Body, Vac., Sec. Lysosome	Lipid Droplet		22, 23, 24 25
		Vacuolated Cell	Micropinocyt. Ves.	Vac.			26
Cephalochordata		Epithelial Cell	Coated Pit, Ves.	Lysosome, Granule	Lipid Droplet		27, 28
		Phagocyte		Lysosome, Phagosome		Algae	29
Chaetognatha		Absorptive Cell	Pinocyt. Ves.	Lysosome-like Body			30, 31
		Absorptive Vac. Cell	Coated Pit, Endocyt. Ves.	Vac., Endolysosomal Compartment			32
Gastrotricha		Absorptive Cell	Pinocyt. Ves., Small Vac.	Lysosome-like Body, Sec. Lososome	Glyc.		33, 34
Rotifera		Stomach Cell	Caveolae, Coated Ves.	Food Vac.		Thorotrast	35, 36
		Stomach Cell		Food Vac., Incl. Body (=Lysosome)			37
Platyhelminthes		Col. Phagocytic Cell	Pinocyt. Ves.	Phagosome, Lysosome, Sec. Lysosome	Lipid Droplet, Glyc.		38
	Tricladida	Phagocytic Cell	Pseudopodia, Food Vac.	Lysosome, Digestive Vac.	Resid. Body, Lipid Droplet, Glyc.		39, 40, 41
	Dalytyphloplanida	Gastrodermal Cell	Micropinocyt. Ves.	Phagosome, Vac.	Lipid Globule		42
	Catenulida	Phagocyte	Coated Endocyt. Ves.	Vac., Lysosome	Resid. Body, Lipid Incl.	Latex Bead	43
	Macrostomida	Phagocytic Cell	Food Vac.	Food Vac., Lysosome	Lipid Droplet		44, 45
Bryozoa		Absorpt. Acid. Cell	Endocyt. Ves., Prim. Lysosome	Digestive Vac. (Sec. Lysosome)			46
Phoronida		Cil. Epithelial Cell	Pinocyt. Ves., Ap. Spher. Granule	Digestive Vac., Ves. Containing Nutrient	Lipid Body		47, 48
Nemertinea		Cil. Gastrodermal Cell	Oval Body, Food Vac.	Lysosome			49, 50
Annelida	Polychaeta	Absorptive Cell	Dense Body	Lysosome	Lipid Droplet, Glyc.		51, 52
	Hirudinea	Intest. Epithelial Cell	Caveolae, Apical Dense Body	Vac.	Lipid Inclusion		53, 54
Mollusca	Gastropoda	Digestive Cell	Endocyt. Ves., Multives. Body	Lysosome, Heterolysosome, Large Vac.	Resid. Body, Lipid Droplet, Glyc.		55, 56, 57
	Gastropoda	Digestive Cell	Small Coated Ves.	Large Vac.		Thorotrast	58
	Bivalvia	Digestive Cell	Microves., Pinosome, Phagosome	Macroves. (Phagolysosome)	Resid. Body, Lipid-like Droplet	Graphite	59, 60, 61
	Bivalvia	Absorptive Cell	Pino/Macropinosome, Phagosome	Lysosome, Heterolysosome	Resid. Body	Nanoparticle	62
	Cephalopoda	Digestive Cell	Pinocytotic Ves.	Digestive Vac.	Brown-Body Vac., Lipid Droplet		63
Priapulida		Epithelial Cell	Ves., Lysosome	Digestive Vac.	Lipid Droplet, Glyc. Particles		64, 65
Kinorhyncha		Epithelial Cell		Digestive Vac.			66, 67
Nematoda		Intest. Epithelial Cell	Pinocyt. Ves., Phagosome	Prim. Lysosome, Phagolysosome	Pigment Gran., Lipid Droplet, Glyc.	Hemoglobin	68, 69, 70
		Intest. Cell	Endosome, Phagosome	Lysosome, Sec. Lysosome	Lipofuscin Granule, Telolysosome		71
Tardigrada		Digestive Cell	Coated Pit, Ves., Multives. Body	Digestive Vac., Lysosome, Sec. Lysosome	Spher. Incl., Lipid Droplet, Glyc.		72, 73, 74
Onychophora		Absorptive Cell	Ves.	Membrane-bound Incl.	Lipid Droplet, Glyc.		75
Crustacea	Copepoda	Midgut Cell	Pinocyt. Vesicle	Lysosome, Heterophagosome			76
	Isopoda	Digestive Cell	Pinocyt. Vesicle	Lysosome-like Body, Vac.	Lipid Droplet, Glyc.		77
	Malacostraca	Digestive Cell	Vesicle	Phagosome, Lysosome-like Granule	Lipid Droplet		78
	Decapoda	Digestive (B) Cell	Pinocyt. Vesicle	Subapical Vac., Supranuclear Vac.			79, 80
Chelicerata	Scorpiones	Digestive Cell	Pinocyt. Vesicle, Channel Vesicle	Lysosome-like Organelle, Brown Body Vac.	Glyc., Lipidic Inclusions	Colloid. Gold	81
	Acariformes	Digestive Cell	Pinocyt. Vesicle, Phagosome	Lysosome, Sec. Lysosome	Resid. Body, Lipid Droplet		82, 83, 84

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