Shellgeek (シェルキー,Sherukī, "Shellky" in Japan) is a virus from the Mega Man Battle Network series. It looks like an oyster. It often hides its shell unless it open up to shoot out needles. It will shoot more than one needle at a time.
Shellgeek is red and shoot out two needles at a time.
Shellnerd (シェルニー, "Shellny") is yellow and shoot out three needles at a time.
Shellman (シェルジー, "Shellgy") is purple and shoot out four needles at a time.