Diomus notescens, copyright Geoff Walker.

Belongs within: Coccidulini.

The Diomini are a cosmopolitan group of smaller, hairy ladybird beetles characterised by postcoxal lines on the first abdominal ventrite merging with the rear margin of the ventrite (Ślipiński 2007).

Characters (from Ślipiński 2007): Small to medium-sized (2–4 mm). Body convex, brown or black, sometimes with colour pattern; winged or wingless; dorsum shortly setose; antennal insertions exposed; antennal groove on underside weak. Eye large, finely facetted, without ocular canthus, interfacetal setae absent. Mandible bidentate apically; prostheca and mola present. Maxillary palp short and stout, terminal palpomere expanded to securiform. Antenna slightly shorter than head, ten- or eleven-segmented, with three-segmented club, scape slim. Pronotum transverse, hypomeron without foveae; prosternum long in front of coxae; prosternal process moderately broad, usually carinate. Meso-metaventrite broadly articulated, usually arcuate anteriorly with metaventrite extending well forward and making mesoventrite very short. Tarsi three- or four-segmented. Abdomen with six ventrites; abdominal postcoxal line at abdominal ventrite merging with hind margin. Ovipositor with coxites transverse, stylus absent; spermatheca complex, worm-like; infundibulum and bursal plate present. Penis with distinct capsule, often complex; penis guide asymmetrical.

|--Decadiomus Chapin 1933S07
| `--D. bahamicusV02
|--Andrzej Ślipiński 2007S07
| `--*A. antennatus Ślipiński 2007S07
|--Dichaina Weise 1850S07
| `--*D. inornata Weise 1923S07
`--Diomus Mulsant 1850 [incl. Amidellus Weise 1923, Heterodiomus Brèthes 1924]S07
|--*D. thoracicus (Fabricius 1801) [=Coccinella thoracica]S07
|--D. australasiae (Blackburn 1892) [=Scymnus australasiae]S07
|--D. brisbanensis (Blackburn 1895) [=Scymnus brisbanensis]S07
|--D. casuarinae (Blackburn 1889) [=Scymnus casuarinae]S07
|--D. corticalis (Lea 1908) [=Scymnus corticalis]S07
|--D. cowleyi (Blackburn 1895) [=Scymnus cowleyi]S07
|--D. cucullifer (Blackburn 1892) [=Scymnus cucullifer]S07
|--D. denhamensis Weise 1929 [=D. labiatus Weise 1908 (preoc.)]S07
|--D. elutus (Lea 1902) [=Scymnus elutus]S07
|--D. ementitor (Blackburn 1895) [=Scymnus ementitor, *Amidellus ementitor]S07
|--D. ferrugineus Weise 1895S07
|--D. flavolaterus (Lea 1926) [=Scymnus flavolaterus]S07
|--D. frater (Lea 1902) [=Scymnus frater]S07
|--D. hamatus Weise 1895S07
|--D. hypocritus Weise 1923S07
|--D. impictus (Blackburn 1895) [=Scymnus impictus]S07
|--D. inaffectatus (Blackburn 1892) [=Scymnus inaffectatus]S07
|--D. indistinctus (Lea 1902) [=Scymnus indistinctus]S07
|--D. insidiosus (Blackburn 1889) (see below for synonymy)S07
|--D. inusitatus (Blackburn 1889) [=Scymnus inusitatus]S07
|--D. jocosus (Blackburn 1892) [=Scymnus jocosus]S07
|--D. kamerungensis (Blackburn 1895) [=Scymnus kamerungensis]S07
|--D. lubricus (Blackburn 1889) [=Scymnus lubricus]S07
|--D. macrops (Lea 1929) [=Scymnus macrops]S07
|--D. maestus (Lea 1926) [=Scymnus maestus]S07
|--D. mimicus (Lea 1902) [=Scymnus mimicus]S07
|--D. notescens (Blackburn 1889) [=Scymnus notescens; incl. D. rusticus Weise 1895]S07
|--D. obumbratus (Blackburn 1895) [=Scymnus obumbratus]S07
|--D. operosus (Blackburn 1895) [=Scymnus operosus]S07
|--D. planulatus (Blackburn 1895) [=Scymnus planulatus]S07
|--D. poonindiensis (Blackburn 1889) [=Scymnus poonindiensis]S07
|--D. pumilio (Weise 1885) (see below for synonymy)S07
|--D. robustus Weise 1895 [=D. major Weise 1895 non Scymnus insidiosus var. major Blackburn 1889]S07
|--D. scapularis (Weise 1885) [=Scymnus (Diomus) scapularis; incl. S. aurugineus Blackburn 1889]S07
|--D. sedani (Blackburn 1889) [=Scymnus sedani]S07
|--D. simplex (Blackburn 1889) [=Scymnus simplex]S07
|--D. sphragitis (Weise 1885) (see below for synonymy)S07
|--D. striatus (Lea 1902) [=Scymnus striatus]S07
|--D. subclarus (Blackburn 1895) [=Scymnus subclarus]S07
|--D. subelongatulus (Blackburn 1892) [=Scymnus subelongatulus]S07
|--D. sydneyensis (Blackburn 1892) [=Scymnus sydneyensis]S07
|--D. tenebricosus (Boheman 1859) [=Scymnus tenebricosus]S07
|--D. triangularis (Lea 1902) [=Scymnus triangularis]S07
|--D. trilobus (Lea 1902) [=Scymnus trilobus]S07
|--D. variiceps (Lea 1929) [=Scymnus variiceps]S07
`--D. whittonensis (Blackburn 1892) [=Scymnus whittonensis]S07

Diomus insidiosus (Blackburn 1889) [=Scymnus insidiosus, S. blackburni Weise 1929; incl. S. insidiosus var. major Blackburn 1889, S. insidiosus var pallipes Blackburn 1889]S07

Diomus pumilio (Weise 1885) [=Scymnus (Diomus) pumilio; incl. S. flavifrons Blackburn 1889, Diomus flavifrons, S. flavifrons var. norfolcensis Lea 1929, S. flavifrons var. occidentalis Blackburn 1889, S. flavifrons var. victoriae Blackburn 1889]S07

Diomus sphragitis (Weise 1885) [=Scymnus (Diomus) sphragitis; incl. S. meyricki Blackburn 1889, S. meyricki var. obscuripes Blackburn 1889]S07

*Type species of generic name indicated


[S07] Ślipiński, A. 2007. Australian Ladybird Beetles (Coleoptera: Coccinellidae): Their biology and classification. Australian Biological Resources Study: Canberra.

[V02] Vandenberg, N. J. 2002. Coccinellidae Latreille 1807. In: Arnett, R. H., Jr, M. C. Thomas, P. E. Skelley & J. H. Frank (eds) American Beetles vol. 2. Polyphaga: Scarabaeoidea through Curculionoidea pp. 371–389. CRC Press.

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