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Title: A crab with three eyes, two rostra, and a dorsal antenna-like structure
Authors: Scholtz, G.
Ng, P.K.L. 
Moore, S.
Keywords: Brain
Crustacea Decapoda
Siamese twins
Issue Date: Mar-2014
Citation: Scholtz, G., Ng, P.K.L., Moore, S. (2014-03). A crab with three eyes, two rostra, and a dorsal antenna-like structure. Arthropod Structure and Development 43 (2) : 163-173. ScholarBank@NUS Repository.
Abstract: We describe a malformed specimen of the freshwater crab Amarinus lacustris from New Zealand. With three eyes in a horizontal row, two rostra, and a dorsal antenna-like structure, the pattern of malformation of this animal is unique and has not been described before. A careful inspection and description of external and internal structures, in particular the central nervous system, were carried out. These revealed, in addition to the external abnormalities, a retarded brain with a hypertrophied and backwards bent protocerebrum connected with all three eyes and putatively with the dorsal antenna-like structure. Based on these data, a variety of hypotheses about the causes for this kind of malformation are discussed. A scenario combining a conjoined twin (Duplicitas anterior) based on the duplication of the embryonic anterior head lobes and a regeneration event leading to the replacement of an eye by an antenna shows the best fit to the observed patterns. © 2013 Elsevier Ltd.
Source Title: Arthropod Structure and Development
ISSN: 14678039
DOI: 10.1016/j.asd.2013.10.007
Appears in Collections:Staff Publications

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