Phylum
…described Agmata Fragmented Calcareous conical shells 5, extinct Annelida Little ring Segmented worms, annelids Multiple circular segments 22,000+ extant Arthropoda Jointed foot Arthropods Segmented bodies and jointed limbs, with chitin exoskeleton 1,250,000+ extant; 20,000+ extinct Brachiopoda Arm foot Lampshells…