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| | [No title] |
 | | It contains two families, the Sialidae (alderflies) and the Corydalidae, the latter subdivided into the Corydalinae (dobsonflies) and the Chauliodinae (fishflies). |
 | | Sialidae: (i) adult gula, cervical region, and the prothoracic sternum secondarily desclerotized, (ii) ocelli lost, (iii) 4th tarsomeres strongly bilobed, (iv) claspers of the male genitalia reduced, and (v) larval pygopods (anal prolegs) lost. |
 | | Larvae bear lateral abdominal filaments (on segments 1-8 in Corydalidae, and 1-7 in Sialidae) and either a pair of anal prolegs (Corydalidae) or a single caudal filament (Sialidae). |
| ag.arizona.edu /tree/eukaryotes/animals/arthropoda/hexapoda/megaloptera/Megaloptera.nex (2188 words) |
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