High-resolution Fig. 2
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High-resolution Fig. 2. Morphology of Pennyella and Rugocythereis. Based on Pennyella rexi sp. nov. (top) and Rugocythereis horrida (bottom). AIL, anterior inner lamella; AMF, anterior marginal frill; AMR, anterior marginal rim; AMS, anterior marginal sulcus; AMSc, adductor muscle scars; CSP, clavate spines; DMS, dorsomedian scar; DS, dorsal scar; FMS, frontal muscle scar; HIN, hingement; MHE, median hinge element; PDT, posterodorsal tubercle; PIL, posterior inner lamella; PMR, posterior marginal rim; PMS, posterior marginal sulcus; PR, primary reticulation; PVS, posteroventral spine; SCMS, subcentral muscle scars; SKS, snap-knob structure (‘additional closing mechanism’ sensu Mazzini 2005); SP, spines; SR, secondary reticulation; VMS, ventromedian scar; VR, ventral ridge; VS, ventral scar.
