Fig. 7 in Exceptionally well-preserved Orsten-type phosphatocopid crustaceans from the Cambrian of Poland

Fig. 7. Phosphatocopid crustacean Cyclotron sp. from Olenus Biozone, Furongian, Dębki 2 borehole, northern Poland. A. ZPAL Cr.11/ph095. Internal view of right valve depicting shell, inner lamella and partly preserved cuticle with apodemes in dorsal part, anterior to the right (A1); detailed view of A1 exhibiting apodemes (numbers of supposed limbs: antenna (2nd), mandible (3rd) and three post-mandibular limbs (4th–6th) and structures interpreted as remains of muscles of hypostome/labrum complex; anterior is up, two nodes, possibly representing muscle scars (arrows) (A2); enlarged posterior part of valve with two apodemes (4th and 5th) and two nodes, possibly representing muscle scars (arrows) in oblique dorso-posterior view, anterior to the right (A3); enlarged proximal part of apodeme (2nd) with muscle fibers attached inside (A4); detailed view of apodeme (4th) with attached putative muscle (A5); detailed view of supposed right proximal part of hypostome-labrum structures, anterior is up (A6). B. ZPAL Cr.11/ph102. Left valve depicting shield, internal lamella cuticle and body cuticle wall with preserved apodemes (B1); detailed view of B1 exhibiting apodemes (2nd–6th), two nodes, possibly representing muscle scars (arrows) (B2); apodemes in oblique latero-ventral view (B3); detailed view of putative muscle fibers within apodeme (4th) (B4); apodeme (4th) in internal view showing putative muscle attached in proximal depression (B5); detailed view depicting proximal part of apodeme (5th) with putative muscle fibers (B6); apodeme (5th) in median view (B7); apodeme (4th) in posterior view (B8); detailed view of supposed proximal hypostome-labrum structures (arrow), in dorsal view (B9). Abbreviations: in, inner lamella cuticle; lst, limb stem; sh, shield.