spinifer guadalupensis, [p. 517]
White spots usually absent on anterior half of carapace, sometimes indistinct; shape of tubercles on anterior edge of carapace variable
16
16. White spots absent on anterior half of carapace; tubercles on anterior edge of carapace low, scarcely elevated, never equilateral or conical; mottled and blotched pattern often not contrasting; ground color of carapace sometimes dark; pale rim of carapace four or five times wider posteriorly than laterally; dark, straight or slightly curved, line connecting anterior margins or orbits
spinifer emoryi, [p. 510]
White spots sometimes indistinct on carapace, or few, small spots present on posterior half of carapace; tubercles on anterior edge of carapace equilateral and wartlike or conical; mottled and blotched pattern usually contrasting; pale rim less than three times wider posteriorly than laterally
spinifer pallidus, [p. 522]
17. Carapace having evidence of more than one dark marginal line, and scattered, black spots or ocelli
spinifer asper, [p. 502]
Carapace having only one, dark, marginal line