Eucosma
See E.hohenwartiana group for separation of E.hohenwartiana / E.parvulana / E.fulvana
Male Genitalia
In most Tortricidae the valva, sacculus and costa are fused together - this can make terminology confusing. Dissection group refers to the valva in 3 parts: sacculus (basally/medially/proximally), cucullus (apically/laterally/distally) and neck (connecting the sacculus and cucullus).
E.cana: neck long & broad, lobe minimally developed, ventral margin sinuate*
E.hohenwartiana: neck short, lobe well-developed, ventral margin angulate.
E.obumbratana: intermediate in lobe development, neck length & breadth and margin angulation. Distinguished by having a pulvinus.
E.tripoliana & E.aemulana** have a 90 degree angle and a semicircular emargination of the ventral margin.
E.conterminana has a similar general shape to E.cana with a sinuate ventral margin and minimally developed lobe, but has a narrower neck and narrower cucullus and a well-developed prominence on the costal margin.
* The valval features of E.cana seem to be variable; some individuals show a narrower neck and greater development of the cucullus lobe and then appearing similar to E.obumbratana, but lacking the pulvinus of that species.
** I have not been convinced that any feature other than habitat separates E.tripoliana (saltmarsh) and E.aemulana
E.cana: neck long & broad, lobe minimally developed, ventral margin sinuate*
E.hohenwartiana: neck short, lobe well-developed, ventral margin angulate.
E.obumbratana: intermediate in lobe development, neck length & breadth and margin angulation. Distinguished by having a pulvinus.
E.tripoliana & E.aemulana** have a 90 degree angle and a semicircular emargination of the ventral margin.
E.conterminana has a similar general shape to E.cana with a sinuate ventral margin and minimally developed lobe, but has a narrower neck and narrower cucullus and a well-developed prominence on the costal margin.
* The valval features of E.cana seem to be variable; some individuals show a narrower neck and greater development of the cucullus lobe and then appearing similar to E.obumbratana, but lacking the pulvinus of that species.
** I have not been convinced that any feature other than habitat separates E.tripoliana (saltmarsh) and E.aemulana
Eucosma conterminana
Eucosma cana
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Eucosma tripoliana
Eucosma obumbratana
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Eucosma hohenwartiana
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E.parvulana and E.fulvana have male genitalia indistinguishable from E.hohenwartiana.
Eucosma metzneriana
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The E.metzneriana / E.pupillana / E.lacteana group should be distinguishable on external features; but they have quite different valval anatomy which may help in case of doubt. E.metzneriana is shown left. E.lacteana has a noticeably produced apex of the cucullus; E.pupillana has a very narrow neck.
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