Western Sahara
A reptile found nowhere else is the Western Giant Spiny-tailed Lizard Uromastyx occidentalis (Google Books) (SDGL).
A
marine fish known solely from Pulpito Bay is the sculpin Gymnocanthus vandesandei (p. 62 of RBINS pdf)
(GBIF)
which is sometimes considered a synonym of Gymnocanthus tricuspis (UBC WM)
(FishBase).
Endemic invertebrates include a dermestid beetle Anthrenus
kabateki (ResearchGate),
a jewel beetle Acmaeodera sahariensis
(ResearchGate),
a weevil Mesites
deserticus (Internet
Archive), a mydas fly Perissocerus
rungsi (Smithsonian)
(p. 2 of Univ.
Nottingham WM pdf),
the scorpions Saharobuthus
elegans (MNHN) and Androctonus agrab (ResearchGate),
and several marine snails: Persicula
enolae (Eddie
Hardy), Clelandella
artilesi (figs. 1-4 at BHL),
and Lautoconus saharicus
(ResearchGate).
Endemic vascular plants include Lotus zemmouriensis (ResearchGate).