Zoo Biology 25:73–82 (2006) Technical Report Morphology of the Blood Cells From Three Species of Wobbegong Sharks (Orectolobus species) on the East Coast of New South Wales J.M. Old 1Ã and C. Huveneers 2 1 Biological Sciences, Macquarie University, New South Wales, Australia 2 Marine Mammal Research Group, Graduate School of the Environment, Macquarie University, New South Wales, Australia This study is the first study to describe blood cell morphology, using light microscopy, for three species of wild-caught wobbegong shark. Blood cell morphology was similar to that described previously in fish. Wobbegong sharks possess erythrocytes, at least three different morphological types of thrombocytes, lymphocytes, eosinophils, neutrophils, granuloblasts and monocytes. No basophils were observed in this study. Similarities and differences in morpholo- gical appearance of wobbegong shark blood cells compared to Chondrichthyes, teleosts and mammalian blood cells are discussed. Zoo Biol 25:73–82, 2006.  c 2005 Wiley-Liss, Inc. Keywords: wobbegong; shark; fish; blood cell; morphology INTRODUCTION Wobbegong sharks are large benthic sharks commonly found in the coastal waters of New South Wales (NSW) and are part of the Orectolobiformes order that also includes collared carpet sharks, blind sharks, bamboo sharks, zebra sharks, nurse sharks, and whale sharks. There are eight currently known species of Published online 10 November 2005 in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/zoo.20079 Received 25 March 2005; Accepted 27 July 2005 Ã Correspondence to: J.M. Old, Biological Sciences, Macquarie University, N.S.W. 2109, Australia. E-mail: jold@els.mq.edu.au r r 2005 Wiley-Liss, Inc.