227 



The morphology of L4K and 14 of Ergaula could easily be mistaken as con-esponding 

 with the situation in Blattellidae {Anaplecta excluded) and Blaberidae: In the latter groups 

 the main muscle of the hla-hook (114 in fig. 249, 276, 303) runs from the anteriormost 

 part of L2 to sclerite L3. The situation in Anaplecta (fig.222) suggests that this hla-muscle 

 is a true 114 whose anterior insertion has been translocated from the L4n-region (with 

 nla) to L2 (discussion in 6.4.3.). Looking at Ergaula only, the "hla-muscle" (14) with its 

 course from L2 anteriorly in the Ive-pouch to the "base of L3" (= L4K) could easily be 

 misinterpreted as the "114", with the "translocation" of its anterior insertion to L2 being 

 a synapomoiphy of Ergaula and the respective Blattellidae and Blaberidae. However, the 

 situations in Polyphaga and Lamproblatta clearly show that in Ergaula the muscle is 14 

 (not 114), the sclerite is L4K (not the basal part of L3), and the similarity with Blattellidae 

 is a case of convergence. 



Ventral sclerite plate Sclerite L4G in the ventral wall of the vla-lobe of Eurycotis 

 and Archiblatta is, by definition, the region L4v (fig.325e,f). L4G of Tryonicus (fig.325g) 

 probably also corresponds exactly to the L4v-region, but it cannot be excluded that parts 

 of the L4c-region are contained in the sclerite (compare in 6.3.1.). In the latter case, L4G 

 of Tryonicus and L4G of Eurycotis and Archiblatta would be only partly homologous. 

 The ventral plate of Anaplecta (L4G in fig. 205) lies similarly in the ventral wall of the 

 vla-lobe like L4G of Tryonicus (fig. 87), and in both species L4G is, apart from the ventral 

 parts of sclerite L4K, the only sclerotisation in the ventral wall of the left complex. This 

 indicates that L4G of Tryonicus and Anaplecta are strictly homologous. The ventral plates 

 of Cryptocercus (L4G in fig. 148), Lamproblatta (L4R in fig. 174), and Polyphaga (L4M 

 in fig. 11 5) also he in the ventral via- wall and can be assumed to be at least in part ho- 

 mologous with each other and with the L4G-plates of the other species. These plates, 

 however, are rather different in their relative sizes, and the homology relations should be 

 analysed in detail. 



Some evidence for the exact homology relations comes from the muscles 12, 15, 16a, 16b 

 (homology discussion in 6.1. and 6.2.), and s3 (homology discussion in 6.9.). In Sphodro- 

 mantis, Mantoida, Polyphaga, and Lamproblatta s3, 12, 15, 16a, and 16b can be 

 homologised one by one (with the exception that in Mantoida 16a and 16b have fused). 

 In Cryptocercus homology is clear for s3 (right part of sl+3), 12, and 16b; 15 and 16a have 

 been lost. In Eurycotis and Anaplecta homology is also clear for s3, 12, and 16b; as regards 

 15 and 16a, homology with the 15 and 16a of the other species is questionable. The relations 

 between the ventral plates and the insertions of 16b, s3, and 12 are different in the various 

 species: 



- In Eurycotis, Cryptocercus, and Anaplecta only 16b (fig. 70, 157, 224) inserts, at least 

 in part, on the ventral plate (L4G in fig.63, 148, 205). s3 (fig.70, 157, 222) inserts in 

 the membrane left-anterior to L4G. The positions of these insertions may suggest (but 

 do not prove) that the L4G of Anaplecta and Cryptocercus are strictly homologous with 

 L4G of Eurycotis (i.e. only L4v but no parts of L4c or of other sclerotisations are 

 included; fig.325e,h,l). The same might be assumed for Tryonicus since its L4G is 

 similar to L4G of Anaplecta (fig.325g). 



