māšōṭā - non-winged locust; wood worm; caterpiller (LSyr. 407, SL 842)

Gez. ŝ may be purely graphical and, therefore, does not necessarily imply a lateral in PS. Judaic Aramaic šāmōṭā, šāmūṭā ‘name of species of locusts’ (Jastrow 920, Levy WT II 492, Levy IV 573) is likely related with metathesis.