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Table 1 Equivalency table for terminology related to the cnidosac from published research [3, 30, 31, 64,65,66,67,68,69, 74]
| Author Herein | Cnidosac | Cnidocysts | Channel | Exit/Cnidopore | Cnidophage | Digestive gland |
|---|---|---|---|---|---|---|
| Hancock & Embleton 1845 | ovate vesicle/sac | elliptical bodies with slender, hair-like filaments | ciliated channel | external orifice | little transparent ellipsoidal membranous bags | liver caecum |
| Wright 1863 | ovoid vesicle/sac | cnidae, thread cells | – | – | – | biliary sac |
| Herdman & Clubb 1889 | cnidophorous sac | cnida | connecting tube, ciliated canal | terminal opening | cnidocyst | hepatic caecum |
| Herdman 1890 | cnidophorous sac | cnida, thread cells | slender tube with thin walls & few muscle fibers | clearly defined aperature at the apex | cnidocyst | hepatic diverticulum |
| Grosvenor 1903 | cnidophorous sac/cnidosac/cnidophore | nematocysts | ciliated canal | terminal opening | cnidocyst/cnidoblast | alimentary canal/ diverticula of the gastric gland |
| Edmunds 1966 | cnidosac | nematocysts | – | cnidopore | cells | digestive gland |
| Kälker & Schmekel 1976 | cnidosac | cnidocysts | pore/ narrow duct | entrance | nematophage | hepatopancreas |
| Conklin & Mariscal, 1977 | cnidosac | nematocysts | – | cnidopore | cnidocyst | |
| Ohkawa & Yamasu, 1993 | cnidosac | nematocysts | – | – | cnidophage cell | digestive diverticulum |
| Greenwood 2009 | cnidosac | nematocysts/kleptocnidae | – | – | cnidophage cell | digestive diverticula |
