Gasteracantha cancriformis showed marked sexual dimorphism in size. Females are 5 to 9 mm in length and 10 to 13 mm in width. Males are 2 to 3 mm long and a small amount shorter in width. Six abdominal spines are present in all morphs, but color and shape show geographic variation. Most individuals have white spots on the underside of the abdomen, but the color of the back and spines may be red, orange or yellow. Also, a small number of spiders have colored legs.
Range length: 2 to 9 mm.
Other Physical Features: ectothermic ; bilateral symmetry ; polymorphic
Sexual Dimorphism: female larger