Species or specious?
Well, computer reconstruction also shows they had a hyoid bone (the one that floats around near your vocal tract) which supports sophisticated vowel sounds, unlike apes. And skeletal/facial reconstruction shows that if they put on jeans and a T-shirt and walked down the High Street, they'd look no more than a little chunky and ugly - very like some of us, ahem.
And they interbred with us, several times fairly freely - we all have some Neanderthal genes in us. Given all that, if we were talking dogs or horses here we would be talking of different breeds of the one species.
The Neanderthal "species" label is so last-millennium sapiens sapiens chauvinist crap.
Ain't it th' truth, you Denisovan-loaded East Asians out there, you?