Description
Trilobitomorpha A L L L L L L Chelicerata x C P L L L L Ci Crustacea A A Mnd Mx Mx L L L L L Tracheata A x Mnd Mx Mx L L L L = acron = segments included in head = body segments x = lost during development = eyes = nephridia O = nephridia lost during development A = Antenna L = Leg C = Chelicera P = Pedipalp Ci = Chilarium Mnd = Mandible Mx = Maxilla Formation of head in arthropod subphyla.Read more about this topic: Chelicerata
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