"De dochlers van Cecrops uinden het slangenkind Ericthonius - The daughters of Cecrops find the child Erichthonius " (details from "Three daughters of Cecrops discovering infant Erichthonius ") (see related A), Jacob Jordaens (1593-1678) Antwerp Museum of Fine Arts, Antwerp, Belgium
Translated as "Les fillers de Cecrops trauvant lenfant Ericthonius" or "The daughters of Cecrops finding the child Ericthonius" who had "snake like feet".
Ichthyosis denotes "skin scales akin to a fish" (in the case of Ericthonius, perhaps similar to a chicken leg as depicted here). In rare instances it presents as a hemi-ichthyosiform skin (one half of the body) with homo-lateral associated malformations.
This mythical story is suggestive of CHILD (Congenital Hemidysplasia with Ichthyosiform erythroderma and Limb Defects) syndrome. Against this hypothesis is that Cecrops was presumably a "boy", since he is portrayed as a "King" - CHILD syndrome most often is an expression (phenotype) of an X-linked mutation (noted in females - it apparently is lethal in males). Children with congenital skin-scales like a fish (ichthyosis) - if impacting only one body side (hemi-ichthyosis) - have concurrent homo-lateral malformations, in particular reduction of limbs.