1. Arachnoid (蜘蛛人) is one of the heteromorphic races in YGGDRASIL

2. A pedal disk regenerates only at the aboral end of a piece, and tentacles only on the oral end of pieces (with the exception of a few heteromorphic tentacles on very small oral pieces).

3. In the small chromosome I, the correlation of the sex-determining allelomorphs M and m with the heteromorphic band 10 C 3 in arm I L was confirmed. This was done by crossover analysis of breakpoints in sex-linked aberrations.