There is in the male, in addition to the X, also a Y chromosome, which acts as its mate in synapsis and reduction.
The method of synapsis in Coptocycla is like that described for Chelymorpha argus.
The synizesis and synapsis stages are similar to those in Chelymorpha (figs. 61 and 62).
From this synapsis the lower neurone proceeds, its axons travelling to the anterior horn and arborising around the motor cells.
synapsis syn·ap·sis (sĭ-nāp'sĭs)
n. pl. syn·ap·ses (-sēz)
The side-by-side association of homologous paternal and maternal chromosomes during early meiotic prophase.