In this article (https://acbcanaria.org/wp-content/upload...anarias-III.pdf) Pedro Oromí writes about an undescribed species from Fuerteventura. I translated the PDF via google translate and in the last section he lists all the species known for the Canaries and their distribution and known habitats. The only sentence about it is "and an undescribed species from Fuerteventura".
I will ask him via mail about more informations.