Fig. 2 in Take a deep breath… The evolution of the respiratory system of symphytognathoid spiders (Araneae, Araneoidea)

Fig. 2 The respiratory system of Mysmenidae — the genera Isela and Mysmenopsis. Dorsal view. a Isela sp., overview of ARS and PRS. b Isela sp., detail of left reduced book lungs showing the tracheal tubes arising from the most lateral and dorsal leaf. c Isela sp., detail of PRS showing the lack of median entapophyses. d–f Mysmenopsis dipluramigo. d Overview. e Detail of left anterior tracheae showing a book lung leaf arising ventrally. f Detail of PRS consisting of numerous tracheae. Abbreviations: BLl, book lung leaf; plT, posterior lateral trachea; pmT, posterior median trachea; rBL, reduced book lung; Sp, spermatheca; Tt, tracheal tube