HYPTIOMINA, Casey, 1906

Li, Liang & Zhou, Hong-Zhang, 2011, Revision and phylogenetic assessment of the rove beetle genus Pseudohesperus Hayashi, with broad reference to the subtribe Philonthina (Coleoptera: Staphylinidae: Staphylinini), Zoological Journal of the Linnean Society 163 (3), pp. 679-722 : 694

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https://doi.org/ 10.1111/j.1096-3642.2011.00731.x

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The subtribe Hyptiomina   , which was established by Casey (1906), contains only the genus Holisus Erichson, 1839   distributed in the Neotropical, Nearctic, and Ethiopian regions ( Herman, 2001). Newton & Thayer (1992) treated it as a subtribe of Staphylinini   . However, the current systematic position of Hyptiomina   in the tribe Staphylinini   may still be questionable ( Solodovnikov & Schomann, 2009). In the present phylogenetic analyses, the genus Holisus   nested within the core of Philonthina   and appeared as Clade C with one branch of the genus Belonuchus   (Clade D). This result agreed well with the recent phylogenetic study ( Solodovnikov & Schomann, 2009); although these two studies were based on different sampled representatives and carried out for different purposes. The genus Holisus   can be distinguished by a very flat body, aciculate apical segments of labial and maxillary palpi, protibia with ctenidium of several rows of stout setae, mesoscutellum with one transverse carina, and especially the presence of an additional oblique line connecting the superior and inferior lines of the pronotal hypomeron ( Smetana, 1995; Newton et al., 2000). However, it shares most of its character states with the members of the subtribe Philonthina   including ligula entire, apical segments of labial and maxillary palpi glabrous, mentum with only one anterolateral seta on each side, neck impunctate, gular sutures fused, claws of all tarsi without empodial setae, and even the additional connecting line of the pronotal hypomeron (similar to that of the genus Craspedomerus   , but much longer). It is also easy to understand the close relationships of Holisus   and Belonuchus   when considering the flat body form and the similar subcortical habitats (most species of Holisus   and Belonuchus   are found under the bark of decaying trees) ( Solodovnikov & Schomann, 2009). If the broad outlines of this analysis are supported by future work, the subtribe Hyptiomina   may suffer the same fate as Craspedomerina   (currently treated as a synonym of Philonthina   ) in the future.