Lec 9 Philippine Mammals [Compatibility Mode].pdf

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1 Philippine Mammals Mammals What are some of the diagnostic features of mammals? •Mammary glands Mammae formula eg. Human 1:0:0 • Hair – homologous to feathers (birds) and scales (reptiles) Functions of hair Thermoregulation, camouflage, defensive structures (spines) • Dentition Heterodont (incisors, canines, premolars and molars) eg. Human 2/2i; 1/1c; 2/2 pm; 3/3 m 2 sets of teeth - polyphyodont milk or deciduous dentition permanent dentition Mammary Gland types Axillary Pectoral Abdominal Inguinal Method of reproduction 1. Prototherians – egg laying (Monotremes) 2. Metatherians – give birth to partially developed embryo (Marsupials) 3. Eutherians – placental mammals Activity patterns of mammals 1. Diurnal- daytime 2. Nocturnal –night time 3. Crepuscular – early morning & late afternoon Mammals tail fluke baleen vs homodont teeth imbricate scales horns vs. antlers ungulate hooves Morphological adaptations
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2 Morphological adaptations patagium (bats) with interfemoral membrane patagium (gliding) opposable digits claws & tubercles Megachiroptera - Pteropodidae Chiroptera - Body covered with fur, teeth present, forelimbs modified into true wings extending from 2 nd to 5 th digit Pteropodidae Fruit bats; inter-femoral membrane absent or reduced; tail short; second finger usually with claw; both tragus and anti-tragus absent Megachiroptera Eonycteris robusta Philippine Nectar Bat Eonycteris spelea Cave
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