Ba
Babakovia, Badainjaranaspis, Baikonuraspis, Bailielloides, Balangia, Baltagnostus, Baltoparadoxides, Bandalaspis, Bapingaspis, Barklyella, Basanellus, Basidechenella, Basilicus, Basocephalus, Batchatiella, Bathycheilidae, Bathydiscus, Bathynotellus, Bathyocos, Bathyuridae, Bathyuriscellus, Bathyuriscidella, Bathyuriscopsis, Bathyuriscus, Batyraspis, Bavarillidae, Bayfieldia,
Be
Bedicella, Beigongia, Beikedamaspis, Beishanella, Belgibole, Bellefontia, Belliceps, Bemaspis, Benesovella, Beothuckia, Bergerolimbus, Berkeia, Berkutaspis, Bernia, Bettonia, Bevanopsis,
Bi
Biavertia, Bicella, Bicornipyge, Bidjinella, Bienella, Bifodina, Bigotina, Bigotinella, Bigotinidae, Birmanites, Biscoia, Bitumulina,
Bl
Blainiopsis, Blandiaspis, Blandicephalus, Blanodalmanites,
† Blayacina Cobbold, 1931
Animalia → Arthropoda → Trilobita
Blystagnostus,
Bo
Bodenbenderia, Boeckops, Bohemaspis, Bohemilla Bohemillidae, Bohemiproetus, Bohemopyge, Bojoscutellum, Bolaspidellus, Bolaspididae, Bolboparia, Bolivianaspis, Bolivicrania, Boliviproetus, Bollandia, Bollandiinae, Bondarevites, Bonnaria, Bonnaspis, Bonnia, Bonniella, Bonnima, Bonniopsis, Borealia, Boreoscutellum, Bornemannaspis, Bornholmaspis, Borogothus, Borthaspis, Boschchekulia, Botomella, Bounyongia,
Br
Brachyaspis, Brackebuschia, Brandysops, Branisaspis, Brassicicephalus, Breviphillipsia, Breviscutellum, Brevitermierella, Bridgeia, Briscoia, Bronteopsis, Brutaspis, Brutonia, Brylyella,
Bu
Bubupeltina, Bucksella, Bufoceraurus,
†Bulnibarbi
Animalia → Arthropoda → Trilobita → Ptychopariida
Bumastides, Bumastinae, Bumastoides, Bumastus, Burmeisterella, Burminresia, Burtonops,