Conodonts, Calcichordates and the Origin of Vertebrates
... coincide with his tree. It also causes striking contradictions in the interpretation of classical morphological characters (for instance by interpreting ctenophorans as deuterostomes), and fails to explain the existence of orthologous genes in bilaterians. It should be noted that protostome and deut ...
... coincide with his tree. It also causes striking contradictions in the interpretation of classical morphological characters (for instance by interpreting ctenophorans as deuterostomes), and fails to explain the existence of orthologous genes in bilaterians. It should be noted that protostome and deut ...
26-1 PowerPoint
... includes sea stars, sea urchins, and sand dollars Echinoderms have spiny skin and an internal skeleton. They also have a water vascular system—a network of water-filled tubes that include suction-cuplike tube feet, which are used for walking and gripping prey. Most exhibit five-part radial symmetry ...
... includes sea stars, sea urchins, and sand dollars Echinoderms have spiny skin and an internal skeleton. They also have a water vascular system—a network of water-filled tubes that include suction-cuplike tube feet, which are used for walking and gripping prey. Most exhibit five-part radial symmetry ...
Galapagos Exploration
... Webbed feet Uses its strong legs and webbed feet to swim and capture fish, eels, and octopuses ...
... Webbed feet Uses its strong legs and webbed feet to swim and capture fish, eels, and octopuses ...
Taxonomy and Systematics: Seeking Order Amidst Diversity
... Hemolymph (the open-circulation system equivalent of blood) carries dissolved gases through short vessels and the hemocoel (main body cavity in adults, since coelom is reduced) As in much of modern systematics, classes are in flux; nevertheless, here are 5 main groups: Trilobites – all extinct durin ...
... Hemolymph (the open-circulation system equivalent of blood) carries dissolved gases through short vessels and the hemocoel (main body cavity in adults, since coelom is reduced) As in much of modern systematics, classes are in flux; nevertheless, here are 5 main groups: Trilobites – all extinct durin ...
Echinoderms and Chordates
... chordates, the adult forms are much modied in body plan and do not have a notochord, a dorsal hollow nerve cord, or a post-anal tail, although they do have pharyngeal slits. The larval form possesses all four structures. Most tunicates are hermaphrodites. Tunicate larvae hatch from eggs inside the ...
... chordates, the adult forms are much modied in body plan and do not have a notochord, a dorsal hollow nerve cord, or a post-anal tail, although they do have pharyngeal slits. The larval form possesses all four structures. Most tunicates are hermaphrodites. Tunicate larvae hatch from eggs inside the ...
Chapter 24 - Bellbrook
... adaptations in structure that enabled them to function in numerous habitats. These features mark the branching points of the evolutionary tree and are discussed in the next section. In this section, you will learn about the characteristics that all animals have in common. ...
... adaptations in structure that enabled them to function in numerous habitats. These features mark the branching points of the evolutionary tree and are discussed in the next section. In this section, you will learn about the characteristics that all animals have in common. ...
Platyhelminthes – gap notes
... These kinds of flatworms have a muscular tube called a pharynx that they use to suck food into the gastrovascular cavity. ...
... These kinds of flatworms have a muscular tube called a pharynx that they use to suck food into the gastrovascular cavity. ...
скачати - ua
... and more pointed for finding berries. It also can hear better because there are more predators like dingoes and large birds in its environment. The smaller wallabies of Australia have adapted to dryer and higher conditions. It can go longer without water. Its claws are also sharper for finding water ...
... and more pointed for finding berries. It also can hear better because there are more predators like dingoes and large birds in its environment. The smaller wallabies of Australia have adapted to dryer and higher conditions. It can go longer without water. Its claws are also sharper for finding water ...
Workshop: The Evolution of Animalia
... The most derived lineages of eumetazoans have an internal body cavity (coelom; pronounced see-lome’) lined on both the parietal and visceral surfaces with mesoderm. However, the two major (putatively) monophyletic groups of coelomates achieve this adult anatomy in different ways. Other ontogenetic f ...
... The most derived lineages of eumetazoans have an internal body cavity (coelom; pronounced see-lome’) lined on both the parietal and visceral surfaces with mesoderm. However, the two major (putatively) monophyletic groups of coelomates achieve this adult anatomy in different ways. Other ontogenetic f ...
Annelids include segmented worms, such as leeches
... simultaneoushermaphroditism, participating in simultaneous sperm exchange when they are aligned for copulation. Earthworms are the most abundant members of the class Oligochaeta, distinguished by the presence of the clitellum as well as few, reduced chaetae ("oligo = "few"; chaetae = "hairs"). The ...
... simultaneoushermaphroditism, participating in simultaneous sperm exchange when they are aligned for copulation. Earthworms are the most abundant members of the class Oligochaeta, distinguished by the presence of the clitellum as well as few, reduced chaetae ("oligo = "few"; chaetae = "hairs"). The ...
Biosc 41 Announcements 10/13
... Most species of leeches live in fresh water; some are marine or terrestrial Leeches include detritivores, predators of invertebrates, and parasites that suck blood Parasitic leeches secrete a chemical called hirudin to prevent blood from coagulating § Once used in blood-letting – not such a good i ...
... Most species of leeches live in fresh water; some are marine or terrestrial Leeches include detritivores, predators of invertebrates, and parasites that suck blood Parasitic leeches secrete a chemical called hirudin to prevent blood from coagulating § Once used in blood-letting – not such a good i ...
Features Used to Classify Animals
... symmetrical. The evolution of bilateral symmetry that allowed for the formation of anterior and posterior (head and tail) ends promoted a phenomenon called cephalization, which refers to the collection of an organized nervous system at the animal's anterior end. In contrast to radial symmetry, which ...
... symmetrical. The evolution of bilateral symmetry that allowed for the formation of anterior and posterior (head and tail) ends promoted a phenomenon called cephalization, which refers to the collection of an organized nervous system at the animal's anterior end. In contrast to radial symmetry, which ...
Introduction to Invertebrates
... What is the difference between acoelomates, pseudocoelomates and coelomates (or eucoelomates?) ...
... What is the difference between acoelomates, pseudocoelomates and coelomates (or eucoelomates?) ...
Features Used to Classify Animals
... symmetrical. The evolution of bilateral symmetry that allowed for the formation of anterior and posterior (head and tail) ends promoted a phenomenon called cephalization, which refers to the collection of an organized nervous system at the animal's anterior end. In contrast to radial symmetry, which ...
... symmetrical. The evolution of bilateral symmetry that allowed for the formation of anterior and posterior (head and tail) ends promoted a phenomenon called cephalization, which refers to the collection of an organized nervous system at the animal's anterior end. In contrast to radial symmetry, which ...
Worksheet 2.5 (Practice Exam 2)
... b. True or False: All organisms belonging to the Lophotrochozoan lineage possess all 3 of these unique morphological traits. 15.) Put the following lineages in order from least diverse (number of named species) to most diverse: Annelida, Mollusca, Arthropoda, Rotifera. a. Annelida, Rotifera, Mollusc ...
... b. True or False: All organisms belonging to the Lophotrochozoan lineage possess all 3 of these unique morphological traits. 15.) Put the following lineages in order from least diverse (number of named species) to most diverse: Annelida, Mollusca, Arthropoda, Rotifera. a. Annelida, Rotifera, Mollusc ...
How did the giraffe get its neck?1
... 2. The giraffe neck has seven vertebrae, like almost all mammals; they are just longer. ...
... 2. The giraffe neck has seven vertebrae, like almost all mammals; they are just longer. ...
Protostomes
... (1) foot: a large muscle located at the base of the animal and usually used in movement (2) visceral mass: the region containing the internal organs and external gill (3) mantle: a tissue layer that covers the visceral mass and that secretes a shell in some species • In molluscs, the coelom's functi ...
... (1) foot: a large muscle located at the base of the animal and usually used in movement (2) visceral mass: the region containing the internal organs and external gill (3) mantle: a tissue layer that covers the visceral mass and that secretes a shell in some species • In molluscs, the coelom's functi ...
Kingdom Animalia
... • Echinodermata – spiny skinned animals (Ex: Sea star) • Chordata – animals with a backbone = Vertebrates ...
... • Echinodermata – spiny skinned animals (Ex: Sea star) • Chordata – animals with a backbone = Vertebrates ...
Chapter 26
... As we explore the invertebrate phyla, keep in mind that these phyla share an evolutionary heritage. In Chapter 30, the relationships between the different phyla of invertebrates will be represented in an evolutionary tree of the animal kingdom. This evolutionary tree will show our best understanding ...
... As we explore the invertebrate phyla, keep in mind that these phyla share an evolutionary heritage. In Chapter 30, the relationships between the different phyla of invertebrates will be represented in an evolutionary tree of the animal kingdom. This evolutionary tree will show our best understanding ...
Animal locomotion
Animal locomotion, in ethology, is any of a variety of movements that results in progression from one place to another. Some modes of locomotion are (initially) self-propelled, e.g. running, swimming, jumping, flying, soaring and gliding. There are also many animal species that depend on their environment for transportation, a type of mobility called passive locomotion, e.g. sailing (some jellyfish), kiting (spiders) and rolling (some beetles and spiders).Animals move for a variety of reasons, such as to find food, a mate, a suitable microhabitat, or to escape predators. For many animals, the ability to move is essential for survival and, as a result, natural selection has shaped the locomotion methods and mechanisms used by moving organisms. For example, migratory animals that travel vast distances (such as the Arctic tern) typically have a locomotion mechanism that costs very little energy per unit distance, whereas non-migratory animals that must frequently move quickly to escape predators are likely to have energetically costly, but very fast, locomotion.