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Kinne, J.; Wani, N. A.; Wernery, U.; Peters, J.; Knospe, Clemens (2010): Is There a Two-Humped Stage in the Embryonic Development of the Dromedary? In: Anatomia, Histologia, Embryologia, Vol. 39, No. 5: pp. 479-480
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Abstract

It has been postulated that the one-humped (Arabian) dromedary and the two-humped (Bactrian) camel originated from a single ancestor. Consequently, the dromedary was considered a breed of the two-humped camel, based on an anatomical study by Lombardini L, 1879: Ann. Del. Universita Toscane, 259, 147, who described a reduced second hump like structure in foetal and adult dromedaries. To resolve this lingering issue, we analysed dromedary foetuses and calves. In contrast to the situation in two-humped camels, we never observed any rudimentary second hump in the dromedary foetuses or calves.