Table 1. A comparison of existing arthropod anatomy ontologies as reported from OBOEdit.

	Concepts( = OBO Terms)	# Terms Defined (% Total)	Relationship Distribution*	# Species covered**	Version
			1	2	3	>3
Hymenoptera (HAO)	1103	1103 (100%)	246	807	49	0	>150 k/1m	29:06:2010 13:39
Mosquito (TGMA) [12]	1861	1001 (92%)	1184	621	43	12	∼3500 (Culicidae)	04:02:2009 10:45
Tick (TADS) [12]	628	627 (99%)	380	189	46	12	∼900	18:11:2007 11:42
Drosophila (FBbt) [13], [14]	6570	1956 (30%)	2357	2968	813	431	1	04:02:2010 12:01
Spider (SPD) [15]	552	404 (73%)	342	197	10	1	∼40 k/∼150 k	17:03:2010 06:57

*Indicates the complexity of each ontology, with respect to the number of concepts with >1 or relationships.

**Estimate of presently described species/Estimated total world species (if notably different).