- Acropeltis aequituberculata (AGASSIZ,IN AGASSIZ & DESOR, 1846)
- Acropeltis atlantica (REY, 1989)
- Acrosalenia bradfordensis (COTTEAU, 1884)
- Acrosalenia jauberti (COTTEAU)
- Acrosalenia mideltensis (VADET, NICOLLEAU & REBOUL, 2010)
- Acrosalenia radians (AGASSIZ, in AGASSIZ & DESOR, 1847)
- Adelopneustes cf. akkajensis (ENDELMAN, 1980)
- Adelopneustes sp.
- Agassizia algarbiensis (FERREIRA, 1962)
- Agassizia clevei (COTTEAU, 1875)
- Agassizia faurai (LAMBERT)
- Aliaster sp. (VALDINUCCI, 1975)
- Allomma desori (WOODWARD, 1856)
- Ambipleurus fabrei (JEANNET, 1936)
- Amblypneustes formosus (VALENCIENNES, 1846)
- Amblypygus americanus (MICHELIN, 1858)
- Amblypygus dilatatus (AGASSIZ, 1840)
- Anorthopygus michelini (COTTEAU, 1860)
-
Anorthopygus texanus (COOKE, 1946)
- Apatopygus mannumensis (HOLMES, 1999)
- Aphelaster integer (GAUTHIER, in LAMBERT, 1920)
- Aplodiadema langi (DESOR, 1856)
- Arachnoides placenta (LINNAEUS, 1758)
- Arbacia improcera (CONRAD, 1843)
- Arbacia waccamaw (COOKE, 1941)
- Arbacina catenata (DESOR, in AGASSIZ & DESOR, 1846)
- Arbacina monilis (DESMAREST, in DEFRANCE, 1836)
- Archiacia sandalina (AGASSIZ, IN AGASSIZ & DESOR, 1847)
- Astriclypeus manni (VERRILL, 1867)
- Astrodaspis antiselli (CONRAD)
- Astrodaspis davisi (GRANT EATON)
- Astrodaspis diabloensis (KEW, 1920)
- Astrodaspis whitneyi (REMOND, 1864)
- Astrolampas depressus (AGASSIZ in AGASSIZ & DESOR, 1847)
- Astrolampas marmonti (BEAUDOUIN, 1842)
- Aulacopygus subcircularis (COTTEAU, 1874)
- Australanthus longianus (GREGORY, 1890)