[Cephalopoda] An elongation of the head between the eyes and the arm crown in many larval and juvenile squids, particularly Brachioteuthidae, Chiroteuthidae and Cranchiidae.

Chiroteuthis veranyi
Chiroteuthis veranyi 2
Chiroteuthis veranyi 3
Chiroteuthis veranyi 4
Chiroteuthis veranyi 5
Chiroteuthis veranyi 6
Leachia(Pyrgopsis)atlantica
Leachia(Pyrgopsis)atlantic2
Bathothauma lyromma
Bathothauma lyromma 2
Bathothauma lyromma 3

Alternative form for Arm-crown pillar : arm-crown stalk brachial pillar snout.