The heartbeat of the spider, Geolycosa missouriensis.
D000818:Animals; D004594:Electrophysiology; D005260:Female; D005724:Ganglia; D006321:Heart / Q000033:anatomy & histology / Q000294:innervation / Q000502:physiology*; D006339:Heart Rate; D005082:Physical Exertion; D013112:Spiders