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Vertebrate and invertebrate animals

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Vertebrate/Invertebrate powerpoint

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3 February 2015

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Vertebrates & Invertebrates

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Vertebrates, Invertebrates, and Classification

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Evolution of Vertebrates

Oct 12, 2014

520 likes | 1.02k Views

Evolution of Vertebrates. The animals called vertebrates get their name from vertebrae, the series of bones that make up the backbone There are about 52,000 species of vertebrates, including the largest organisms ever to live on the Earth

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• mineralized skeleton
• spinal cord
• ancestral mineralized skeleton
• jaws paired appendages fins

Presentation Transcript

Evolution of Vertebrates • The animals called vertebrates get their name from vertebrae, the series of bones that make up the backbone • There are about 52,000 species of vertebrates, including the largest organisms ever to live on the Earth • Vertebrates have great disparity, a wide range of differences within the group

Fig. 34-2 Echinodermata (sister group to chordates) Cephalochordata (lancelets) ANCESTRAL DEUTERO- STOME Chordates Urochordata (tunicates) Notochord Myxini (hagfishes) Common ancestor of chordates Craniates Petromyzontida (lampreys) Head Vertebrates Chondrichthyes (sharks, rays, chimaeras) Vertebral column Actinopterygii (ray-finned fishes) Gnathostomes Jaws, mineralized skeleton Actinistia (coelacanths) Osteichthyans Lungs or lung derivatives Lobe-fins Dipnoi (lungfishes) Lobed fins Amphibia (frogs, salamanders) Tetrapods Reptilia (turtles, snakes, crocodiles, birds) Legs Amniotes Amniotic egg Mammalia (mammals) Milk

Derived Characters of Chordates • All chordates share a set of derived characters • Some species have some of these traits only during embryonic development • Four key characters of chordates: • Notochord • Dorsal, hollow nerve cord • Pharyngeal slits or clefts • Muscular, post-anal tail

Fig. 34-3 Dorsal, hollow nerve cord Muscle segments Notochord Mouth Anus Pharyngeal slits or clefts Muscular, post-anal tail

Notochord • The notochord is a longitudinal, flexible rod between the digestive tube and nerve cord • It provides skeletal support throughout most of the length of a chordate • In most vertebrates, a more complex, jointed skeleton develops, and the adult retains only remnants of the embryonic notochord

Dorsal, Hollow Nerve Cord • The nerve cord of a chordate embryo develops from a plate of ectoderm that rolls into a tube dorsal to the notochord • The nerve cord develops into the central nervous system: the brain and the spinal cord

Pharyngeal Slits or Clefts • In most chordates, grooves in the pharynx called pharyngeal clefts develop into slits that open to the outside of the body • Functions of pharyngeal slits: • Suspension-feeding structures in many invertebrate chordates • Gas exchange in vertebrates (except vertebrates with limbs, the tetrapods) • Develop into parts of the ear, head, and neck in tetrapods

Muscular, Post-Anal Tail • Chordates have a tail posterior to the anus • In many species, the tail is greatly reduced during embryonic development • The tail contains skeletal elements and muscles • It provides propelling force in many aquatic species

Chordata • Vertebrates • fish, amphibians, reptiles, birds, mammals • internal bony skeleton • backbone encasing spinal column • skull-encased brain • deuterostome hollow dorsal nerve cord becomes brain & spinal cord becomes gills or Eustachian tube Oh, look…your firstbaby picture! pharyngeal pouches becomes vertebrae postanal tail becomes tail or tailbone notochord

Lancelets • Lancelets (Cephalochordata) are named for their bladelike shape • They are marine suspension feeders that retain characteristics of the chordate body plan as adults

Fig. 34-4 Cirri 2 cm Mouth Pharyngeal slits Atrium Notochord Digestive tract Atriopore Dorsal, hollow nerve cord Segmental muscles Anus Tail

Tunicates • Tunicates (Urochordata) are more closely related to other chordates than are lancelets • They are marine suspension feeders commonly called sea squirts • As an adult, a tunicate draws in water through an incurrent siphon, filtering food particles

Tunicates most resemble chordates during their larval stage, which may last only a few minutes Incurrent siphon to mouth Water flow Notochord Dorsal, hollow nerve cord Excurrent siphon Tail Excurrent siphon Excurrent siphon Atrium Muscle segments Incurrent siphon Pharynx with slits Intestine Anus Stomach Intestine Tunic Atrium Esophagus Pharynx with slits Stomach An adult tunicate A tunicate larva

Early Chordate Evolution • Ancestral chordates may have resembled lancelets • Genome sequencing of tunicates has identified genes shared by tunicates and vertebrates • Gene expression in lancelets holds clues to the evolution of the vertebrate form

Craniates: chordates with a head • The origin of a head opened up a completely new way of feeding for chordates: active predation • Craniates share some characteristics: a skull, brain, eyes, and other sensory organs

Derived Characters of Craniates • Craniates have two clusters of Hox genes; lancelets and tunicates have only one cluster • Neural crest, a collection of cells near the dorsal margins of the closing neural tube in an embryo • Neural crest cells give rise some of the bones and cartilage of the skull

Fig. 34-7 Neural crest Neural tube Dorsal edges of neural plate Migrating neural crest cells Notochord

In aquatic craniates the pharyngeal clefts evolved into gill slits • Craniates have a higher metabolism and are more muscular than tunicates and lancelets • Craniates have a heart with at least two chambers, red blood cells with hemoglobin, and kidneys

Hagfishes • The least derived surviving craniate lineage is Myxini, the hagfishes • Hagfishes have a cartilaginous skull and axial rod of cartilage derived from the notochord, but lack jaws and vertebrae

Fig. 34-9 Slime glands

Vertebrates are craniates that have a backbone • During the Cambrian period, a lineage of craniates evolved into vertebrates • Vertebrates became more efficient at capturing food and avoiding being eaten

Derived Characters of Vertebrates • Vertebrates have the following derived characters: • Vertebrae enclosing a spinal cord • An elaborate skull • Fin rays, in the aquatic forms

Lampreys • Lampreys (Petromyzontida) represent the oldest living lineage of vertebrates • They are jawless vertebrates inhabiting various marine and freshwater habitats • They have cartilaginous segments surrounding the notochord and arching partly over the nerve cord

Origins of Bone and Teeth • Mineralization appears to have originated with vertebrate mouthparts • The vertebrate endoskeleton became fully mineralized much later

Gnathostomes are vertebrates that have jaws • Today, jawed vertebrates, or gnathostomes, outnumber jawless vertebrates • Gnathostomes have jaws that might have evolved from skeletal supports of the pharyngeal slits

Fig. 34-13-3 Gill slits Cranium Mouth Skeletal rods

Other characters common to gnathostomes: An additional duplication of Hox genes An enlarged forebrain associated with enhanced smell and vision In aquatic gnathostomes, the lateral line system, which is sensitive to vibrations

salmon, trout, sharks Vertebrates: Fish 450 mya gills • Characteristics • body structure • bony & cartilaginous skeleton • jaws & paired appendages (fins) • scales • body function • gills for gas exchange • two-chambered heart; single loop blood circulation • ectotherms • reproduction • external fertilization • external development in aquatic egg body

Chondrichthyans (Sharks, Rays, and Their Relatives) • Chondrichthyans (Chondrichthyes) have a skeleton composed primarily of cartilage • The cartilaginous skeleton evolved secondarily from an ancestral mineralized skeleton • The largest and most diverse group of chondrichthyans includes the sharks, rays, and skates

Most sharks • Have a streamlined body and are swift swimmers • Are carnivores • Have a short digestive tract; a ridge called the spiral valve increases the digestive surface area • Have acute senses

Shark eggs are fertilized internally but embryos can develop in different ways: • Oviparous: eggs hatch outside the mother’s body • Ovoviviparous: the embryo develops within the uterus and is nourished by the egg yolk • Viviparous: the embryo develops within the uterus and is nourished through a yolk sac placenta from the mother’s blood

Ray-Finned Fishes and Lobe-Fins • The vast majority of vertebrates belong to a clade of gnathostomes called Osteichthyes • Osteichthyes includes the bony fish and tetrapods

Nearly all living osteichthyans have a bony endoskeleton • Aquatic osteichthyans are the vertebrates we informally call fishes • Most fishes breathe by drawing water over gills protected by an operculum • Fishes control their buoyancy with an air sac known as a swim bladder

Fig. 34-16 Swim bladder Dorsal fin Adipose fin (characteristic of trout) Caudal fin Spinal cord Brain Nostril Anal fin Cut edge of operculum Lateral line Liver Gills Anus Gonad Heart Stomach Urinary bladder Pelvic fin Kidney Intestine

Tetrapods are gnathostomes that have limbs • One of the most significant events in vertebrate history was when the fins of some lobe-fins evolved into the limbs and feet of tetrapods • Tetrapods have some specific adaptations: • Four limbs, and feet with digits • Ears for detecting airborne sounds

Humerus Femur Ulna Pelvis Shoulder Tibia Radius Lobe-finned fish Fibula Femur Pelvis Humerus Shoulder Radius Tibia Ulna Fibula Early amphibian Transition to Land Evolution of tetrapods

Fig. 34-19 Bones supporting gills Tetrapod limb skeleton

350 mya frogs salamanders toads lung buccal cavity glottis closed Vertebrates: Amphibian • Characteristics • body structure • legs (tetrapods) • moist skin • body function • lungs (positive pressure) & diffusion through skin for gas exchange • three-chambered heart • Double loop circulatory system; veins from lungs back to heart, from heart to rest of body • ectotherms • reproduction • external fertilization • external development in aquatic egg • metamorphosis (tadpole to adult)

(a) Order Urodela Amphibians • Amphibians (class Amphibia) are represented by about 6,150 species of organisms in three orders • Order Urodela includes salamanders, which have tails

(b) Order Anura • Order Anura includes frogs and toads, which lack tails

(c) Order Apoda • Order Apoda includes caecilians, which are legless and resemble worms

Amphibian means “both ways of life,” referring to the metamorphosis of an aquatic larva into a terrestrial adult • Most amphibians have moist skin that complements the lungs in gas exchange • Fertilization is external in most species, and the eggs require a moist environment

Fig. 34-22 (a) Tadpole (b) During metamorphosis (c) Mating adults

Amniotes are tetrapods that have a terrestrially adapted egg • Amniotes are a group of tetrapods whose living members are the reptiles, including birds, and mammals • Amniotes are named for the major derived character of the clade, the amniotic egg, which contains membranes that protect the embryo • The extraembryonic membranes are the amnion, chorion, yolk sac, and allantois

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