- Similar appearance of Ophion forticornis
- Dwarf forms of O. obscuratus that can superficially resemble other Ophion species
Distinguishing O. forticornis from O. obscuratus
- is rarely collected in Britain (but is seemingly more frequent in some other countries)
- is restricted to sand dunes
- has a much greater gap between the ocelli and eyes
- has a rather slenderer metasoma (abdomen)
Dwarf forms of O. obscuratus
O. obscuratus is known to occur in 3 distinct morphs in Britain (Brock, 1982):
- spring form
- 'autumnal dwarfs'
- 'autumnal giants' – the most frequent form
- yellow apex to the stigma
- the noticeably paler stripes along the inner edges of the eyes
- Ophion obscuratus is widely distributed across the Palaearctic (Europe and temperate Asia).
- The apparent range of O. obscuratus may have been counfounded with those of similar species (records from Argentina, for example, are certainly erroneous). Nevertheless, this is certainly a widespread and frequently abundant species.
- Across Britain, O. obscuratus is one of the most frequently trapped nocturnal ichneumonids. It can be found in a variety of habitats and is particularly abundant in gardens.
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