Evo-devo. A head with no torso.
Casci
T
T
D000818:Animals; D019521:Body Patterning; D004330:Drosophila / Q000196:embryology* / Q000235:genetics; D029721:Drosophila Proteins; D006257:Head / Q000196:embryology*; D018398:Homeodomain Proteins / Q000235:genetics; D009154:Mutation; D015534:Trans-Activators / Q000235:genetics
D029721:Drosophila Proteins; D018398:Homeodomain Proteins; D015534:Trans-Activators; C056478:bcd protein, Drosophila