Synagoga arabesque sp. nov., male. General morphology, mantle structures (SEM) A general view lateral, left side B Inner body (prosoma), lateral view (thoracic segments numbered in Roman numerals, abdominal segments in Arabic numerals) C submarginal fold of mantle with cuticular fringe (indicated by arrowheads) near anterior margin (anterior direction indicated by dotted arrow) D submarginal fold of mantle with cuticular fringe (indicated by arrowheads) in middle part on ventral side of valve of carapace (anterior direction indicated by dotted arrow) E submarginal fold of mantle with cuticular fringe and setiform projections (indicated by arrowheads) at posterior end of valve of carapace (thin marginal fold indicated by small arrows, anterior direction indicated by dotted arrow) F frontal filament complex (thoracopods numbered). Abbreviations: a1 – antennules, ab – abdomen, ar – anterior ramus of frontal filament complex, bs – basal ramus of frontal filament complex, ffc – frontal filament complex, fr – furcal rami, lb – labrum, oc – oral cone, pe – penis, pr – posterior ramus of frontal filament complex, te – telson, thp1-6 – thoracopods I–VI. Scale bars: in μm.