page_title: Stenophlebiidae
section_title: Sexual dimorphism
hierarchical_section_title: Stenophlebiidae / Description / Adult / Sexual dimorphism
caption_attribution_description: English: Cratostenophlebia schwickerti (Odonata: Stenophlebiidae), Lower Cretaceous, Crato Formation, Brazil, female allotype WDC137, ovipositor
context_page_description: The Stenophlebiidae is an extinct family of medium-sized to large fossil odonates from the Upper Jurassic and Cretaceous period that belongs to the damsel-dragonfly grade within the stem group of Anisoptera. They are characterized by their long and slender wings, and the transverse shape of the discoidal triangles in their wing venation.
context_section_description: Males are distinguished by a weak anal angle of the hindwing base and in some species of Upper Jurassic Stenophlebia by a club-like dilation of the termial part of the abdomen. The male secondary genitalia are unknown, but probably were of the anisopterid type. The male terminalia of the abdomen are of the anisopterid type, thus composed of a pair of dorsal claspers (cerci) and an unpaired ventral process (epiproct).
  Nel et al. (1993) stated that the female ovipositor is reduced, while Bechly (2007, 2010) could demonstrate that at least the female of the stenophlebiid genus Cratostenophlebia had a distinct endophytic ovipositor.
caption: Cratostenophlebia schwickerti, Lower Cretaceous, Brazil, ovipositor of female allotype specimen
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