Historically, it is very obscure and usually referred to Cetiosaurus, but recent analyses suggest that it is a distinct genus, and possibly related to Turiasaurus.

The generic name is derived from Greek καρδία, kardia, "heart", and ὀδών, odon, "tooth", in reference to its heart-shaped profile.

Within a few decades, he and others were viewing Cardiodon as a possible synonym of his most well-known sauropod genus, Cetiosaurus.

[4][5] Richard Lydekker formalized this view in a roundabout way in 1890, by assigning Cetiosaurus oxoniensis to Cardiodon on the basis of teeth from Oxfordshire associated with a skeleton of C.

[9] More recently, Royo-Torres et al. (2006), in their description of Turiasaurus, pointed out Cardiodon as a possible relative to their new, giant sauropod, placing it in the Turiasauria.