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Normal and Defective Colour Vision$
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John D. Mollon, Joel Pokorny, and Ken Knoblauch

Print publication date: 2003

Print ISBN-13: 9780198525301

Published to Oxford Scholarship Online: April 2010

DOI: 10.1093/acprof:oso/9780198525301.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 20 October 2021

Lack Of S-Opsin Expression in the Brush-Tailed Porcupine (Atherurus Africanus) and Other Mammals. Is the Evolutionary Persistence of S-Cones a Paradox?

Lack Of S-Opsin Expression in the Brush-Tailed Porcupine (Atherurus Africanus) and Other Mammals. Is the Evolutionary Persistence of S-Cones a Paradox?

Chapter:
(p.31) Chapter 4 Lack Of S-Opsin Expression in the Brush-Tailed Porcupine (Atherurus Africanus) and Other Mammals. Is the Evolutionary Persistence of S-Cones a Paradox?
Source:
Normal and Defective Colour Vision
Author(s):

P. Ahnelt

K. Moutairou

M. Glösmann

A. Kübber-Heiss

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198525301.003.0004

This chapter describes the photoreceptor layer of the African brush-tailed porcupine (Atherurus africanus) and surveys the occurrence of secondary short wavelength cone (pigment) sensitivity loss. This loss is a seemingly frequent event in recent placental mammal evolution, and it contrasts with the long persistence of the S-cone system in the early Mesozoic mammals. The loss may point to changing roles of the short-wavelength-sensitive system during different stages of the mammalian evolution.

Keywords:   African brush-tailed porcupine, Atherurus africanus, photoreceptor, secondary short wavelength cone, S-cone

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