Figure 2
From: The Porifera Ontology (PORO): enhancing sponge systematics with an anatomy ontology
Ontology visualization showing a portion of the spicule hierarchy (with many terms omitted for space reasons). The graph visualization is drawn using the OBO-Edit Graph View plug-in for Protégé 4. Inset are examples of spicules including, from left to right, a style (st), an acanthostyle (ac), a strongyle (sg), and an oxea (ox).