. Principles of modern biology. Biology. ANIMAL KINGDOM MARSUPIALS ^CENTAL ^ MODERN REPTILES DINOSAURS y Zjt MONC MONOTREMES EARLY MAMMALS MODERN AMPHIBIA EARLY AMPHIBIA MODERN BONY FISH ARTHROPODS PERIPATUS ANNELIDS NEMERTINES FLATWORMS [Platyhelminlhes} CTENOPHORES COELENTERATES. EARLY BONY FISH JAWLESS FISH CEPHALOCHORDATA Amphioxus] HEMICHORDATA jrn worms) ECH1NODERMS PRIMITIVE "BLASTULOIDS" (Multicellular & Coloniol) ^ HOLOZOIC FLAGELLATES (Aerobicl MODERN PROTOZOA NICELLULAR GREEN PLANTS / (produced 02) / EARLY COLORLESS CELLS (Anaerobic; produced CO2) PRIMITIVE LIVING MATT
. Principles of modern biology. Biology. ANIMAL KINGDOM MARSUPIALS ^CENTAL ^ MODERN REPTILES DINOSAURS y Zjt MONC MONOTREMES EARLY MAMMALS MODERN AMPHIBIA EARLY AMPHIBIA MODERN BONY FISH ARTHROPODS PERIPATUS ANNELIDS NEMERTINES FLATWORMS [Platyhelminlhes} CTENOPHORES COELENTERATES. EARLY BONY FISH JAWLESS FISH CEPHALOCHORDATA Amphioxus] HEMICHORDATA jrn worms) ECH1NODERMS PRIMITIVE "BLASTULOIDS" (Multicellular & Coloniol) ^ HOLOZOIC FLAGELLATES (Aerobicl MODERN PROTOZOA NICELLULAR GREEN PLANTS / (produced 02) / EARLY COLORLESS CELLS (Anaerobic; produced CO2) PRIMITIVE LIVING MATTER (Subcellular; produced CO2) t FIRST ORGANIC MATTER (see Chapter 101 Fig. 29-11. Probable relations of the main phyla of plants and animals. cases like the Trilobita (Fig. 32-31), they be- Shortly thereafter (Silurian strata) the first long to groups that are now extinct. land plants appear, followed (in the Silurian Quite early in the Paleozoic era (Ordovi- and Devonian periods), by primitive amphib- cian strata), fossil Vertebrata begin to be well ians and reptiles, which also began to in- represented, as primitive fishlike forms, vade the land. The later strata of the Paleozoic. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marsland, Douglas, 1899-. New York, Holt, Rinehart and Winston
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