AKERIDAE
5598
12 Sp, 1 Var, 4 Img
(Sea)

AKIODORIDIDAE
5706
10 Sp, 0 Var, 2 Img
(Sea)

AKTUBONAUTILIDAE
4078
6 Sp, 0 Var, 2 Img
(Sea)
(FOSSIL)

ALACUPPIDAE
5626
1 Sp, 0 Var, 0 Img
(Sea)

ALASTEGIIDAE
7472
6 Sp, 0 Var, 2 Img
(Sea)
(FOSSIL)

ALATOCONCHIDAE
2556
3 Sp, 0 Var, 0 Img
(Sea)
(FOSSIL)

ALBANITIDAE
3322
1 Sp, 0 Var, 0 Img
(Sea)
(FOSSIL)

ALDANELLIDAE
8624
13 Sp, 0 Var, 3 Img
(Sea)
(FOSSIL)

ALLATHECIDAE
8846
28 Sp, 0 Var, 0 Img
(Sea)
(FOSSIL)

ALLODESMATIDAE
2086
1 Sp, 0 Var, 1 Img
(Sea)
(FOSSIL)

ALLOPOSIDAE
3822
2 Sp, 0 Var, 1 Img
(Sea)

ALLOTRIOCERATIDAE
4000
9 Sp, 0 Var, 0 Img
(Sea)
(FOSSIL)

ALTAICORNIDAE
8818
6 Sp, 0 Var, 0 Img
(Sea)
(FOSSIL)

AMALTHEIDAE
3128
30 Sp, 4 Var, 28 Img
(Sea)
(FOSSIL)

AMASTRIDAE
5906
325 Sp, 132 Var, 50 Img
(Land)

AMATHINIDAE
6158
60 Sp, 3 Var, 34 Img
(Sea)

AMBONYCHIIDAE
2560
172 Sp, 0 Var, 18 Img
(Sea)
(FOSSIL)

AMITIDAE
8820
1 Sp, 0 Var, 0 Img
(Sea)
(FOSSIL)

AMMONITIDA (UNASSIGNED)
3252
56 Sp, 1 Var, 2 Img
(Sea)
(FOSSIL)

AMMONOIDEA (UNASSIGNED)
3702
123 Sp, 0 Var, 44 Img
(Sea)
(FOSSIL)

AMNICOLIDAE
5176
160 Sp, 49 Var, 40 Img
(Freshwater)

AMNIGENIIDAE
2000
3 Sp, 0 Var, 3 Img
(Freshwater)
(FOSSIL)

AMPEZZANILDIDAE
6132
4 Sp, 0 Var, 4 Img
(Sea)
(FOSSIL)

AMPHIBOLIDAE
5840
18 Sp, 1 Var, 8 Img
(Sea)

AMPHIBULIMIDAE
5986
122 Sp, 19 Var, 68 Img
(Land)

AMPHIMENIIDAE
8208
28 Sp, 0 Var, 10 Img
(Sea)

AMPHITOMARIIDAE
6116
5 Sp, 0 Var, 3 Img
(Sea)
(FOSSIL)

AMPHITRETIDAE
3830
3 Sp, 1 Var, 1 Img
(Sea)

AMPULLARIIDAE
5028
208 Sp, 83 Var, 127 Img
(Freshwater)

AMPULLINIDAE
5370
173 Sp, 6 Var, 71 Img
(Sea)

ANABATHRIDAE
5178
153 Sp, 15 Var, 66 Img
(Sea)

ANADENIDAE
5876
22 Sp, 0 Var, 4 Img
(Land)

ANADONTELLIDAE
2580
1 Sp, 0 Var, 1 Img
(Freshwater)
(FOSSIL)

ANADROMIDAE
5898
11 Sp, 0 Var, 10 Img
(Land)
(FOSSIL)

ANAHAMULINIDAE
3672
39 Sp, 0 Var, 20 Img
(Sea)
(FOSSIL)

ANARCESTIDAE
3020
23 Sp, 0 Var, 7 Img
(Sea)
(FOSSIL)

ANASPIDEA (UNASSIGNED)
5602
1 Sp, 0 Var, 0 Img
(Sea)
(FOSSIL)

ANASTOMOPSIDAE
6034
1 Sp, 0 Var, 0 Img
(Land)
(FOSSIL)

ANATINELLIDAE
2190
1 Sp, 0 Var, 1 Img
(Sea)

ANATOMIDAE
6388
88 Sp, 3 Var, 29 Img
(Sea)

ANCILLARIIDAE
5318
356 Sp, 28 Var, 342 Img
(Sea)

ANCISTROBASIDAE
6396
13 Sp, 0 Var, 4 Img
(Sea)

ANCISTROCHEIRIDAE
3730
1 Sp, 0 Var, 1 Img
(Sea)

ANCYLOCERATIDAE
3054
409 Sp, 38 Var, 34 Img
(Sea)
(FOSSIL)

ANDERSSONOCERATIDAE
3372
23 Sp, 0 Var, 0 Img
(Sea)
(FOSSIL)

ANETSHELLIDAE
1000
1 Sp, 0 Var, 1 Img
(Sea)
(FOSSIL)

ANGARIIDAE
6306
55 Sp, 9 Var, 33 Img
(Sea)