Petrarca rubus sp. nov., paratype, mouthparts, SEM. A, labrum, lateroventral view. B, C, distal part and cutting edge of mandible respectively (tiny setae on cutting edge indicated by arrowheads). D, dense thin setae on proximal half of outer margin of mandible. E, maxillule. F, G, middle and lower parts of cutting edge of maxillule. H, basal ‘pore-field’ of maxillule. I, maxillules and maxillae. J, thickened and wrinkled cuticle on distal surface of maxilla. K, ctenoid scale on lateral surface of maxilla. Abbreviations: mx1, maxillules; mx2, maxillae. Scale bars in µm.