| Abida polyodon (Draparnaud, 1801) | Spain | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | |  available for loan |
|
| Abida secale (Draparnaud, 1801) | Spain | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
|
| Absolonia gigantea (Absolon, K, 1901) | Unknown | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
|
| Acanthaster planci (Linnaeus, 1758) | Panama | 1/15/24 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
|
| Acanthodactylus erythrurus (Schinz, 1833) | Spain | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
|
| Acanthodactylus erythrurus (Schinz, 1833) | Spain | 4/1/14 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
|
| Acanthozoon aranfaibo Cuadrado, Moro & Norena, 2017 | Spain | 6/18/15 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
|
| Acmaeodera bipunctata (Olivier, 1790) | Cyprus | 4/19/24 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Whole Organism | | available for loan |
|
| Acmaeodera saxicola Spinola, 1838 | Cyprus | 4/22/24 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Whole Organism | | available for loan |
|
| Acmaeoderella farinosa (Reiche & Saulcy, 1856) | Cyprus | 5/10/24 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Head + Thorax | | available for loan |
|
| Acmaeoderella pseudovirgulata Volkovitsh & Bílý, 1979 | Cyprus | 7/14/24 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Head + Thorax | | available for loan |
|
| Acrida ungarica ungarica | Georgia | 8/21/24 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Abdomen | | available for loan |
|
| Acrotylus insubricus (Scopoli, 1786) | Georgia | 8/22/24 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Abdomen | | available for loan |
|
| Adelphocoris seticornis (Fabricius, 1775) | Georgia | 8/10/24 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Other somatic animal tissue | | available for loan |
|
| Adenoplana Stummer-Traunfels, 1933 | Spain | 1/26/12 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
|
| Adenoplana Stummer-Traunfels, 1933 | Spain | 1/26/12 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | unknown | | available for loan |
|
| Aegaeobuthus cyprius (Gantenbein & Kropf, 2000) | Cyprus | 7/11/24 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | Cephalothorax | | available for loan |
|
| Aegires leuckartii Vérany, 1853 | Spain | 11/26/23 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | mantle | | available for loan |
|
| Aegires palensis Ortea, Luque & Templado, 1990 | Spain | | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | mantle | | available for loan |
|
| Aegires palensis Ortea, Luque & Templado, 1990 | Spain | 6/7/20 | | | | | | | | |
| Repository | Material Type | Preparation Type | Relation | Available for Loan | | MNCN, Madrid | tissue | mantle | | available for loan |
|