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Coelacanth is considered a living fossil, showing little evolutionary change over millions of years.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Evidences of Evolution - Paleontological and Comparative Anatomy
Psilotum, known as a "living fossil," has a primitive vascular system and is one of the simplest vascular plants.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Pteridophytes - Structure and Life Cycle
Monoplacophora is small class of deep-sea molluscs considered living fossil because single dredged living species Neopilina galatheae recovered in 1952 off Costa Rica, previously known only from Cambrian-Devonian fossils. Exhibits cap-shaped single shell, serially repeated gills with five to six ctenidia, eight pairs of foot retractor muscles, two atria and nephridia suggesting traces of metamerism bridging annelid segmentation and molluscan organization, intermediate between polyplacophorans and conchiferans. Gastropoda snails sluggish crawl, Polyplacophora eight plates, Cephalopoda advanced
Ref: Brusca & Brusca, Invertebrates, 3rd ed., Monoplacophora Neopilina; NCBI Bookshelf, Living Fossil
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