Number of distinct species calculated using annotations

Statement: 
Number of distinct species calculated using annotations
A limit number of results per page $number$ (e.g.10)
Query: 
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX sbmlrdf: <http://identifiers.org/biomodels.vocabulary#> SELECT (count (DISTINCT ?annotation) as ?number_annotations) WHERE { ?species rdf:type sbmlrdf:Species . ?species ?qualifier ?annotation . ?qualifier rdfs:subPropertyOf sbmlrdf:sbmlAnnotation } limit ??number