Table 1.
Summary data on the taxonomic distribution of genome resources across the phylum Mollusca. Each class is divided into orders and major clades, indicating the approximate number of described species, the average C-value for members of the clade where any data have been published, and number of species with published genomes as of 1 September 2020. Clades noted in italic text are those without any published genomes that are of critical relevance to molluscan phylogeny and/or clades with more than 500 species and no published genomes.
| class | order (or clade) | known species | C-value average (from n spp.) | species with published genomes | |
|---|---|---|---|---|---|
| Bivalvia | Adapedonta | 120 | 2 | ||
| Anomalodesmata | 550 | ||||
| Arcida | 350 | 1.67 (3) | 1 | ||
| Cardiida | 1000 | ||||
| Carditida | 150 | ||||
| Galeommatida | 250 | ||||
| Gastrochaenida | 15 | ||||
| Limida | 300 | 1.40 (2) | |||
| Lucinida | 250 | ||||
| Myida | 250 | 1.38 (5) | 3 | ||
| Mytilida | 300 | 1.76 (31) | 5 | ||
| Nuculanida | 400 | ||||
| Nuculida | 200 | 4.25 (2) | |||
| Ostreida | 200 | 1.16 (19) | 4 | ||
| Palaeoheterodonta | 900 | 3.10 (2) | 1 | ||
| Pectinida | 500 | 1.69 (1) | 4 | ||
| Solemyida | 50 | 2.10 (1) | |||
| Venerida | 1000 | 1.70 (42) | 4 | ||
| Caudofoveata | Chaetodermatida | 150 | |||
| Cephalopoda | Nautilida | 5 | |||
| Myopsida | 50 | 3.65 (2) | 1 | ||
| Oegopsida | 250 | ||||
| Sepiida | 200 | 3.75 (1) | 1 | ||
| Spirulida | 1 | ||||
| Octopoda | 250 | 4.13 (3) | 3 | ||
| Vampyromorpha | 1 | ||||
| Monoplacophora | Tryblidiida | 40 | |||
| Polyplacophora | Chitonida | 700 | 1.57 (9) | 1 | |
| Lepidopleurida | 200 | ||||
| Scaphopoda | Dentaliida | 300 | 4.01 (2) | ||
| Gadilida | 300 | 2.41 (1) | |||
| Solenogastres | Cavibelonia | 200 | 0.64 (5) | ||
| Neomeniamorpha | 50 | 0.30 (1) | |||
| Pholidoskepia | 60 | ||||
| Sterrofustia | 20 | ||||
| Gastropoda | Patellida | 400 | 1 | ||
| Neomphalida | 50 | 0.44 (1) | 1 | ||
| Cocculinida | 60 | ||||
| Pleurotomariida | 70 | ||||
| Trochida | 2400 | 1.56 (5) | |||
| Lepetellida | 900 | 1.53 (15) | 3 | ||
| Seguenziida | 700 | ||||
| Cycloneritida | 1000 | ||||
| Hypsogastropoda | 13 000 | 1.19 (19) | |||
| Cerithiimorpha | 1500 | 2.10 (15) | |||
| Campanilimorpha | 20 | ||||
| Neogastropoda | 17 000 | 3.10 (26) | 5 | ||
| Architaenioglossa | 4000 | 4.05 (29) | 4 | ||
| Acteonimorpha | 250 | ||||
| Ringiculida | 80 | ||||
| Nudibranchia | 2500 | 1.16 (5) | |||
| Pleurobranchida | 90 | ||||
| Runcinida | 60 | ||||
| Cephalaspidea | 800 | 1.60 (1) | |||
| Umbraculida | 10 | ||||
| Aplysiida | 90 | 1.90 (3) | 1 | ||
| Pteropoda | 150 | 1 | |||
| Sacoglossa | 350 | 2.83 (1) | 2 | ||
| Acochlidia | 50 | ||||
| Siphonarimorpha | 100 | ||||
| Hygrophila | 900 | 1.34 (12) | 4 | ||
| Systellommatophora | 200 | ||||
| Stylommatophora | 20 000 | 2.86 (8) | 1 | ||
| Ellobiida | 300 | ||||
| ‘Lower Heterobranchia’ | 500 | ||||