| Abida polyodon (Draparnaud, 1801) | Spain | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | |  available for loan |
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| Abida secale (Draparnaud, 1801) | Spain | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
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| Absolonia gigantea (Absolon, K, 1901) | Unknown | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
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| Acanthaster planci (Linnaeus, 1758) | Panama | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
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| Acanthodactylus erythrurus (Schinz, 1833) | Spain | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
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| Acanthodactylus erythrurus (Schinz, 1833) | Spain | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
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| Acanthozoon aranfaibo Cuadrado, Moro & Norena, 2017 | Spain | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
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| Acmaeodera bipunctata (Olivier, 1790) | Cyprus | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Whole Organism | | available for loan |
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| Acmaeodera saxicola Spinola, 1838 | Cyprus | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Whole Organism | | available for loan |
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| Acmaeoderella farinosa (Reiche & Saulcy, 1856) | Cyprus | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Head + Thorax | | available for loan |
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| Acmaeoderella pseudovirgulata Volkovitsh & Bílý, 1979 | Cyprus | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Head + Thorax | | available for loan |
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| Acrida ungarica ungarica | Georgia | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Abdomen | | available for loan |
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| Acrotylus insubricus (Scopoli, 1786) | Georgia | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Abdomen | | available for loan |
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| Adelphocoris seticornis (Fabricius, 1775) | Georgia | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Other somatic animal tissue | | available for loan |
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| Adenoplana Stummer-Traunfels, 1933 | Spain | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
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| Adenoplana Stummer-Traunfels, 1933 | Spain | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
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| Aegaeobuthus cyprius (Gantenbein & Kropf, 2000) | Cyprus | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Cephalothorax | | available for loan |
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| Aegires leuckartii Vérany, 1853 | Spain | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | mantle | | available for loan |
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| Aegires palensis Ortea, Luque & Templado, 1990 | Spain | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | mantle | | available for loan |
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| Aegires palensis Ortea, Luque & Templado, 1990 | Spain | | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | mantle | | available for loan |
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