[3] Percy Sladen was a zoologist and had a particular interest in echinoderms, creating an important collection, including specimens from the Challenger expedition.

[3] Their marriage was described as "a union of heart and mind, yielding a bright and tender sympathy which strengthened and stimulated him in his life's work".

[9] After the death of her husband in 1900, Sladen was determined that his collection would be available for the public and endowed a new gallery and curatorial position at the Royal Albert Memorial Museum in Exeter.

[12] She features in the portrait by James Sant showing Linnean Society of London: First Formal Admission of Women Fellows, painted in 1906.

The white-bellied woolly mouse opossum (Marmosa constantiae) was named by Oldfield Thomas in honour of her financing the expedition by Alphonse Robert which collected the type specimen in 1902.

[13][14][15] The Fernando Po swift (Apus sladeniae), a bird, was also named after Sladen, who provided financial support for its discovery.