idiosoma
/ˌɪdɪəˈsəʊmə/Zoology
noun
The main part of the body of a mite or tick, consisting of the abdomen fused with the prosoma and typically separated from the capitulum (gnathosoma) by a furrow.
Origin
1930s. From idio- + soma, probably after German Idiosoma. Compare Dutch idiosoma.