Examples from the Web for tergal
The crests for the tergal depressor muscles are either absent or very feebly developed.A Monograph on the Sub-class Cirripedia (Volume 2 of 2)|Charles Darwin
Tergal margin straight, overlapping about one third of the entire width of the terga.A Monograph on the Sub-class Cirripedia (Volume 1 of 2)|Charles Darwin
Two tergal feet half as long and thick, simple (in the figure hidden behind the large pectoral feet).
Tergal: belonging to the primitively upper surface: see dorsal.Explanation of Terms Used in Entomology|John. B. Smith
The claspers seem to be the tergal portions of the ninth segment.