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Evolution and Diversity of the Facial Morphology Between Strepsirrhines

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Evolution and Diversity of the Facial Morphology Between Strepsirrhines View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Diposit Digital de Documents de la UAB EVOLUTION AND DIVERSITY OF THE FACIAL MORPHOLOGY BETWEEN EXTANT STREPSIRRHINES AND HAPLORRHINES Ignasi Borrell Paños 2014/2015 INTRODUCTION PRIMATES’ PHYLOGENY There are about 300 species of living primates, subdivided between strepsirrhines and haplorhines (Figure 1). But this classification has changed throughout the years: Lemuroidea OLD CLASSIFICATION PRESENT CLASSIFICATION Lemuriformes Daubentoidea STREPSIRRHINI Strepsirrhini PROSIMIAN HAPLORRHINI Lorisoformes Lorisidea Strepsirrhines Anthropoidea PRIMATES Tarsiiformes Tarsiiformes Tarsoidea Tarsiiformes Tarsiiformes Pithecoidea HAPLORRHINI ANTHROPOIDEA STREPSIRRHINI Platyrrhini Ceboidea Anthropoidea - Strepsirrhines have got at least three specialized features: a long nasolacrimal duct that makes an unusual dental Cercopithecoidea tooth comb with reduced upper incisors, the laterally flaring talus, and the grooming claw on the second digit of their Catarrhini feet. Also, they posses rhinarium and vibrissae on the snout. Hominoidea - Haplorhines are a large group of primates. They are called this way because they don’t have neither rhinarium nor Figure 1. Phylogenetic tree of primate order. from Haplorhini and Strepsirrhini semiorders to families. vibrissae on the snout. All of them have uterus with just one chamber. OBJETIVES - Tarsiers retain primitive characteristics such as grooming claws and an unfused mandibular symphysis. They share - Review of the evolution of facial characters in living primates. characteristics with Anthropoidea, such as lacking rhinarium, partition of postorbital septum - Explain the evolution of the morphological adaptations of the face in primates. DIVERSITY IN FACIAL PLANE FEATURES - Compare strepsirrhines and haplorrhines facial planes features. STREPSIRRHINI HAPLORHINI CRANIAL DIVERSITY CRANIAL DIVERSITY ↓ DIVERSITY ↑ DIVERSITY Range of body sizes: 110g to 170 kg PINNAE - enhance environmental mapping - dietary changes ↑ Body mass ↑ Brain size ↑ Cranial size - shifts in the visual system - Large - changes in social structure - Narrow PINNAE - Membranous NOCTURNAL - Small - Movable - Slightly movable Haplorrhini outer ear have got more diversity in pinna - Hidden under fur’s head width than in pinna height - More symmetrical FUNCTIONS DIURNAL Locate insect preys SNOUT Attenuated snout, situated in a more midfacial position. Approaching predators Most of haplorhines lack facial vibrissae, and all of them lack Vocal signals emitted by individual of their specie facial rhinarium. OCULAR ORBITS SNOUT The skin of the face has many primitive characteristics: ↑Body size ↓ Orbit size ↓ Eyeball diameter Discret sets of vibrissae “Forward facing” orbits DIURNALITY Rhinarium Small diurnal anthropoids have larger eyes than similarly sized mammals, reflecting Hairless, moist patch of skin around the nostrils and occupying a their enhance visual acuity. portion of the lip. OCULAR ORBITS Nocturnal primates have the largest eyes relative to skull size Aotus is the only NOCTURNAL anthropoid gender Relatively broad distance between both orbits. EYE MORPHOLOGY ENHANCE VISION SENSIVITY EYE MORPHOLOGY ANTHROPOIDS Small corneas HIGH VISUAL ACUITY Large corneas relative to eyes size Tarsier (Haplorrhini) TARSIERS Large corneas SECONDARILY NOCTURNAL *All images have been taken from flickr and Wikipedia, and they are absolutely copyright free.
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