See: acron [Martin, 2005].
Anteriormost part of the body bearing eyes [Perez Farfante and Kensley, 1997].
See: acron [McLaughlin, 1980].
(Order Decapoda):
Term applied to anteriormost region of head (cephalon), especially when this is free of carapace. Consists of eyes and eyestalks, antennules, antennae, and labrum (i.e., of acron and first cephalic somite) [Stachowitsch, 1992].
(Order Euphausiacea):
Anteriormost region of head (cephalon); consists of eyes and first two head segments (antennular and antennal somites) and is movably articulated with rest of head [Stachowitsch, 1992].
Crustacea glossary. Natural History Museum of Los Angeles County. 2011.