Mesopropithecus
... that the sloth lemurs of the genus Mesopropithecus were once thought to be indriids due to the similarities between their skulls and those of living sifakas?
...  that the <a href="./Sloth_lemur" id="mwGIk" rel="mw:WikiLink" title="Sloth lemur">sloth lemurs</a>  of the genus <i id="mwGIo"><b id="mwGIs"><a href="./Mesopropithecus" id="mwGIw" rel="mw:WikiLink" title="Mesopropithecus">Mesopropithecus</a></b></i>  were once thought to be <a href="./Indriidae" id="mwGI0" rel="mw:WikiLink" title="Indriidae">indriids</a>  due to the similarities between their <a href="./Skull" id="mwGI4" rel="mw:WikiLink" title="Skull">skulls</a> and those of living <a href="./Sifaka" id="mwGI8" rel="mw:WikiLink" title="Sifaka">sifakas</a>?