Udeini

Udeini is a tribe in the species-rich subfamily Spilomelinae in the pyraloid moth family Crambidae. The tribe was erected by Richard Mally, James E. Hayden, Christoph Neinhuis, Bjarte H. Jordal and Matthias Nuss in 2019.

Systematics

Nine genera, altogether comprising 262 species, are currently placed in Udeini:
*'' Cheverella'' B. Landry in Landry, Roque-Albelo & Hayden, 2011
*'' Conchylodes'' Guenée, 1854 (synonyms ''Ledereria'' Snellen, 1873, ''Nonazochis'' Amsel, 1956)
*''Deana'' Butler, 1879 (= ''Adena'' Walker, 1863, ''Nesarcha'' Meyrick, 1884)
*'' Ercta'' Walker, 1859 (= ''Erota'' Walker, 1859)
*'' Mnesictena'' Meyrick, 1884
*'' Sisyracera'' Möschler, 1890
*'' Tanaophysa'' Warren, 1892
*''Udea'' Guenée in Duponchel, 1845 (synonyms ''Melanomecyna'' Butler, 1883, ''Notophytis'' Meyrick, 1932, ''Protaulacistis'' Meyrick, 1899, ''Protocolletis'' Meyrick, 1888, ''Stantira'' Walker, 1863) – type genus of the tribe
*'' Udeoides'' Maes, 2006

The name Udeini was proposed by Patrice Leraut in 1997 in Pyraustinae. However, the proposed name was not accompanied by a description to differentiate the taxon, and therefore lacking a requirement issued by the International Code of Zoological Nomenclature in their article 13.1 for names published after 1930.

Description

The tribe is circumscribed by three synapomorphies: In the male genitalia, the depth of the central vertical split of the juxta is 10-60% of the juxta length. In the female genitalia, the colliculum, i.e. the posteriormost section of the ductus bursae, situated between the antrum and the attachment of the ductus seminalis, is strongly sclerotised. Furthermore, the corpus bursae usually bears an elongate rhombical, an ovate or an "ediacaroid" signum, named after the Ediacaran biota from the Neoproterozoic Era, which exhibit body shapes similar to the shape of the signum in Udeini.

Udeini is one of the four so-called non-euspilomeline tribes, which share several plesiomorphic morphological characters with the sister group of Spilomelinae, the Pyraustinae. For example, female imagines of some species show a reduction of the frenular bristles in the wing coupling mechanism to only one bristle, e.g. in the '' Udea alpinalis'' and '' U. itysalis'' species groups (sensu ).

The uncus shape in the male genitalia is very diverse, ranging from unicapitate in the ''Udea'' genus group (comprising ''Deana'', '' Mnesictena'', '' Tanaophysa'', ''Udea'' and '' Udeoides'') to conical in '' Conchylodes'', reduced to a triangle in '' Sisyracera'' and '' Ercta'', or even reduced to a slim transverse band over the tegumen in the monotypic genus '' Cheverella''. The ''Conchylodes'' genus group is characterised by hair-like monofilament chaetae on the uncus of the male genitalia, as opposed to the thick bifid chaetae present in most other Spilomelinae. The valva costa is slightly concave, with the ventral sacculus edge being parallel to the costa (which is inflated in ''Cheverella''), and apical of the sacculus, the valva tapers towards a rounded apex.

The female genitalia exhibit a strongly sclerotized antrum except for ''Cheverella'', where it is weakly sclerotized. A membraneous appendix bursae is present in '' Conchylodes'', '' Ercta'' and '' Sisyracera'', which is attached to the anterior end of the corpus bursae in the former two genera, and to the posterior end in the latter genus. In all ''Udea'' species groups except the '' Udea ferrugalis'' group, an accessory signum is present in the conjunction of ductus bursae and corpus bursae.

Food plants

Species of Udeini feed on a broad spectrum of food plants. Some species like ''Udea rubigalis'' are highly polyphagous, feeding on plants from a wide variety of plant families. The caterpillars of ''Mnesictena'' feed on ''Muehlenbeckia'' (Polygonaceae), ''Urtica'' and '' Australina'' (Urticaceae). ''Conchylodes'' larvae have been recorded from Annonaceae, Asteraceae, Boraginaceae, Cordiaceae, Malvaceae and Platanaceae, and the caterpillars of ''Sisyracera'' and ''Cheverella'' are recorded from Boraginaceae.

Distribution

Several genera are geographically confined, e.g. ''Deana'' and '' Mnesictena'' to New Zealand, '' Udeoides'' to the Afrotropical realm and '' Sisyracera'' to the Neotropical realm. ''Udea'' on the other hand, with its 214 species, is found on every continent except Antarctica, and members of the '' Udea ferrugalis'' species group are especially abundant on oceanic islands.

References

{{Taxonbar, from=Q85811742

Spilomelinae
Moth tribes