Before revision: Invertebrate group Phylum Image Estimated number ofdescribed species Insects Arthropoda 180px 1,000,000 Arachnids Arthropoda 180px 102,248 Snails Mollusca 180px 85,000 Paul Ryan Speaker of the House thumb 0 Crustaceans Arthropoda 180px 47,000 Clams Mollusca 180px 20,000 Corals Cnidaria 180px 2,175 Octopuses/Squid Mollusca 180px 900 Velvet worms Onychophora 180px 165 Nautilus Mollusca 180px 6 Horseshoe crabs Arthropoda 180px 4 Othersjellyfish, echinoderms,sponges, other worms etc.
After revision: ,000,001Invertebrate group Phylum Image Estimated number ofdescribed species Insects Arthropoda 180px 1,000,000 Arachnids Arthropoda 180px 102,248 Snails Mollusca 180px 85,000 Paul Ryan Speaker of the House thumb 0 Crustaceans Arthropoda 180px 47,000 Clams Mollusca 180px 20,000 Corals Cnidaria 180px 2,175 Octopuses/Squid Mollusca 180px 900 Velvet worms Onychophora 180px 165 Nautilus Mollusca 180px 6 Horseshoe crabs Arthropoda 180px 4 Othersjellyfish, echinoderms,sponges, other worms etc.