The male produces an aphrodisiac sex hormone from his tergal glands that encourages female mounting. Queens discharge a glandular secretion from the tergal gland, which males are strongly attracted to. Kinorhynchs have tergal and sternal plates too, though seemingly not homologous with those of arthropods. The seventh tergal segment is present transversely, but not appreciated medially. The first three tergal segments are banded with white stripes along lateral apical aspects.