Virus-like particles Dermacentor reticulatus ticks.    From Wordnik.com.  [MyLinkVault Newest Links] Reference

Missouri also has American dog ticks (Dermacentor variabilis), which carry Rocky Mountain Spotted Fever, but again this is a less frequently encountered species.    From Wordnik.com.  [THE MEDICAL NEWS] Reference

March 2004 pickin 'Dermacentor.    From Wordnik.com.  [grouse Diary Entry] Reference