Hoofed mammals Ungulates • Ungulates: Refer to mammals with hooves • Artiodactyla: even toed • Perissodactyla: odd toed Hoofed mammals (ungulates) Order Perissodactyla Weight borne on one central toe Order Artiodactyla Weight shared between two central toes Hoof a modified nail? Hooves, claws, and nails are all composed of two structures: the unguis (a scale-like plate; our finger- and toe-nails) and the subunguis (a softer layer, found as a very fine layer on the underside of our fingernails) which connect the unguis to the pad of the digit. Hoof a good modification? Ungulates account for the majority of the herbivores in the world Over 257 species Skulls of ungulates Perissodactyla Ovis - sheep Equus - horse Artiodactyla Camelus - camel Sus - pig Perissodactyla Contains17 Recent species in three families: Equidae (horses), Tapiridae (tapirs), Rhinocerotidae (rhinoceroses) Perissodactyls: Equidae examples Equus caballus Feral horse (Mustang) Przewalski’s Horse Equus asinus donkey 3 species Zebra Perrisodatyles are Herbivores Unique digestive system and dentition to suit their diet. Special bacteria in their intestines to digest cellulose. Horse skull Cusps of cheekteeth joined by ridges Long diastema Canines large in males, small or absent in females Equidae: True wild horses are called the Przewalski’s Horses: http://animal.discover y.com/videos/jawsand-claws-2-wildhorses.html True wild horses do not look like the domesticated horse which has been bred by humans for over 4,000 years. Equidae: Zebra’s 3 species: Grevy’s Plains Mountain http://animal.discover y.com/videos/growing -up-zebra-babyzebra.html Perissodactyl: Tapiridae (Tapirs) Diet: Herbivore Average life span in the wild:25 to 30 years Size:Height at shoulder, 29 to 42 inches Weight:500 to 800 lbs Status:Endangered Perissodactyl: Tapiridae = Tapirs Mountain Tapirs Bairds Tapir Malayan Tapir Lowland Tapir Perissodactyl: Rhinocerotidae (Rhinoceros) STATUS:Endangered DESCRIPTION: There are five species of rhinos The African species: white and black rhinos. Asian rhinos include the Indian and the Javan The five species range in weight from 750 pounds to 8,000 pounds and stand anywhere from four and a half to six feet tall. Perissodactyl: Rhinocerotidae POPULATION: Black Rhino: 2,400 White Rhino: 7,500 Sumatran Rhino: 400 Javan Rhino: fewer than 100 Indian Rhino: more than 2,000 Perissodactyl: Rhinocerotidae (Rhinoceros) Perissodactyl: Rhinocerotidae LIFESPAN: 35 years. HABITAT: Rhino habitat ranges from savannas to dense forests in tropical and subtropical regions. Artiodactyla Artiodactyls are the most diverse, large, terrestrial mammals alive today. They are the fifth largest order of mammals, consisting of approximately 210 species. Suborders and families of Artiodactyla 1 Domestic Cow Ruminantia 2 Cape Buffalo Ruminantia 3 White-tailed Deer Ruminantia 4 Pygmy (Hippopotaminae) 5 Caribou Ruminantia 6 Giraffe Ruminantia 7Hippopotamus (Hippopotaminae) 8South American LamaTylopoda 9White-lipped PeccaryTayassuidae 10 Common Warthog Suidae 11Domestic Pig Suidae 12 Camel Tylopoda 13Collared PeccaryTayassuidae 14Bison Ruminantia (Bovidae) Artiodactyla Ruminants Upper incisors absent, replaced in life by a hard pad on which lower incisors bite Suiformes (non ruminants) Male canines curl upward Artiodactyla: Herbivores Artiodactyla are also herbivores Most are Ruminants Digestion in ruminants occurs sequentially in a fourchambered stomach Compared to the perissodactyla Artiodactyla have cloven feet. Why the difference? artiodactyls - 1 Capra hircus – goat Cervus timorensis - rusa Camelus dromedarius – camel Sus scrofa – pig artiodactyls - 2 Bubalus bubalis – buffalo Antilope cervicapra - blackbuck Bos taurus x Bos indicus – cattle Bos javanicus – banteng And finally, Cetacea Two suborders: Mysticeti Baleen whales Right whales Rorquals Odontoceti Toothed whales Sperm whales Dolphins How can whales be related to artiodactyla? Astragali of the Eocene protocetids (left) and Artiocetus clavis (right), as compared to that of the pronghorn Antilocapra americana (centre). Note the distinct double-pulley shape. Molecular evidence now indicates clearly that cetaceans are actually artiodactyls that have become totally aquatic Balaenopteridae - Rorquals Mysticeti Balaenidae – Right whales Megaptera novaeangliae Humpback Balaena australis Southern Right While Balaenoptera physalus – Fin whale Baleen is used to filter plankton Long, fine baleen of Blue Whale, suitable for filtering krill (tiny crustaceans) Baleen hangs down from palate Short, coarse baleen of Minke Whale, suitable for trapping small fish Balaenoptera musculus – Blue whale But when feeding, the whale relaxes the grooves and takes in gallons of water, which it pushes through the baleen and expels, filtering out the prey Grooves on throat of rorquals are normally pulled tight to make mouth into a beak Odontoceti – toothed whales Orcinus orca – Orca or Killer whale Sperm whale tooth Homodont (teeth all alike) usually dozens Physeter in each jaw macrocephalus – Sperm whale Delphinus delphis – Common dolphin