[105] Kamraj (fern) (Helminthostachys zeylanica) 94 Carp (Carassius carassius) 100 [107] Red viscacha rat (Tympanoctomys barrerae) 102 Highest number known in mammals, thought to be a tetraploid[108] or allotetraploid.[109] [110] Walking catfish (Clarias batrachus) 104 [111] American paddlefish (Polyodon spathula) 120 [112] Northern lamprey (Petromyzontinae) 174 [113] Rattlesnake fern (Botrypus virginianus) 184 [114] Red king crab (Paralithodes camtschaticus) 208 Field horsetail (Equisetum arvense) 216 Agrodiaetus butterfly (Agrodiaetus shahrami) 268 This insect has one of the highest chromosome numbers among all animals. [115] Black mulberry (Morus nigra) 308 44-ploid [116] Atlas blue (Polyommatus atlantica) 448-452 2n = circa 448–452.