1. acanthicum
    [Aspidoceras gr. acanthicum]
  2. achilles
    [Lithacosphinctes achilles (M)]
  3. acris
    [Parkinsonia (Parkinsonia) aff. acris]
  4. acutus
    [Turrilites acutus]
  5. adicra
    [Sonninia (Euhoploceras) adicra (M)]
  6. adicra
    [Sonninia (Euhoploceras) cf. adicra]
  7. aegoceratoides
    [Brancoceras (Eubrancoceras) aegoceratoides]
  8. aenigmaticum
    [Phlycticeras aenigmaticum (M)]
  9. afikpoense
    [Libycoceras afikpoense]
  10. alberti
    [Taramelliceras alberti]
  11. alisiense
    [Acanthopleuroceras alisiense]
  12. alluaudi
    [Forresteria (Forresteria) alluaudi]
  13. alluaudi
    [Forresteria (Forresteria) alluaudi morphe ampozaloakaense]
  14. alphacordatum
    [Cardioceras alphacordatum]
  15. alpinum
    [Protacrioceras alpinum]
  16. alternotuberculatum
    [Protanisoceras (Protanisoceras) gr. alternotuberculatum]
  17. amalthei
    [Arieticeras gr. amalthei]
  18. amapondense
    [Eubostrychoceras (Amapondella) amapondense]
  19. ampambiensis
    [Pseudoschloenbachia (Hourcqiella) ampambiensis (?M)]
  20. anar
    [Taramelliceras anar]
  21. anceps
    [Baculites anceps juv.]
  22. anceps
    [Reineckeia (Reineckeia) anceps anceps (M)]
  23. anceps
    [Reineckeia (Reineckeia) anceps anceps (m)]
  24. andinus
    [Pseudoneoptychites "andinus"]
  25. andinus
    [Pseudoneoptychites aff. "andinus"]
  26. andrussowi
    [Retowskiceras andrussowi]
  27. angolaense
    [Pseudocalycoceras angolaense]
  28. annulatum
    [Calycoceras (Newboldiceras) annulatum]
  29. annulatum
    [Spiroceras annulatum (m)]
  30. antecedens
    [Perisphinctes (Dichotomosphinctes) antecedens (m)]
  31. apertum
    [Hildoceras apertum (M)]
  32. approximans
    [Nostoceras (Nostoceras) approximans (m)]
  33. aquisgranensiformis
    [Scaphites aquisgranensiformis (m)]
  34. archiacianus
    [Protohoplites (Protohoplites) archiacianus]
  35. argelliezi
    [Costiphylloceras argelliezi]
  36. arisphinctoides
    [Homoeoplanulites (Parachoffatia) arisphinctoides]
  37. arkelli
    [Homoeoplanulites (Parachoffatia) arkelli (M)]
  38. arkelli
    [Perisphinctes (Otosphinctes) arkelli]
  39. arnaudi
    [Yezoites arnaudi (M)]
  40. arrialoorensis
    [Menuites arrialoorensis (M)]
  41. asflaensis
    [Mammites asflaensis]
  42. asflaensis
    [Mammites asflaensis]
  43. asiaticum
    [Calycoceras (Newboldiceras) asiaticum asiaticum]
  44. asiaticum
    [Calycoceras (Newboldiceras) asiaticum spinosum (M)]
  45. athleta
    [Peltoceras athleta (m)]
  46. athleta
    [Peltoceras athleta morphe athleta (M)]
  47. athleta
    [Peltoceras athleta morphe athleta (M)]
  48. athleta
    [Peltoceras athleta morphe baylei (M)]
  49. aumalense
    ["Mantelliceras" cf. aumalense]
  50. aumalensis
    [Mesoturrilites aumalensis]
  51. aurigerus
    [Procerites (Siemiradzkia) aurigerus (m)]
  52. auritus
    [Callihoplites auritus]
  53. austeni
    [Parapuzosia (Austiniceras) austeni]
  54. austeni
    [Parapuzosia (Austiniceras) cf. austeni]
  55. austriacum
    [Eulophoceras austriacum]