Cephalosome

Ceph´a`lo`some

    (sĕf´å`lô`sōm)
n.1.(Zool.) The anterior region or head of insects and other arthropods.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Caullery and Mesnil (1914) reported a different exiting sequence, with the middle of the body emerging first, followed by the cephalosome and finally the urosome.
Habitus as in figure 3C, body relatively long, compact anteriorly, cephalosome with large rounded dorsal integumental window and length/ wide ratio = 1.1.
First leg-bearing somite separates from cephalosome. Mouth aperture distinct, without labrum or labium.