Bironium species
Creators: name: Löbl, Ivan
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Bironium

description: Key to the <b> <i>Bironium</i> species of New Guinea and adjacent islands</b> 1 Pronotumochraceous, elytrablack...................................... <b> <i>B. bicolor</i> sp. nov.</b> - Colour patter of pronotum and elytra different................................................. <b>2</b> 2 Elytral disc with distinct, often impressed punctures rows. Lateral parts of metaventrite with conspicuous coarse punctures.............................................. <b>3</b> - Elytral disc without puncture rows. Lateral parts of metaventrite very finely punctate.............................................................................................................. <b>6</b> 3 Elytra uniformly black...................................................................................... <b>4</b> - Elytra maculate................................................................... <b> <i>B. maculatum</i> Löbl</b> 4 Antennomere XI yellowish, much lighter than preceding antennomers. Mesoventrite lacking median ridge.......................................... <b> <i>B. flavapex</i> Löbl</b> - Antennomere XI about as light as antennomeres IX and X. Mesoventrite with or without median ridge.................................................................................... <b>5</b> 5 Most of elytral disc coarsely punctate. Metaventrite with coarse punctures scattered over prevailing anterior surface....................... <b> <i>B. punctatum</i> sp. nov.</b> - Most of elytral disc very finely punctate, coarse elytral punctures arrange to form two rows. Sides of metaventrite with few coarse punctures near anterior margins.......................................................................................... <b> <i>Bironium</i> sp.</b> 6 Elytra bicolorous............................................................................................... <b>7</b> - Elytra uniformly reddish­brown to black.......................................................... <b>8</b> 7 Pronotum ochraceous, or ochraceous along lateral and anterior margins and with large dark spot. Hypomera ochraceous. Elytral disc with punctation usually uneven, on small part of disc coarser than on prevailing discal surface.......................................................................................................... <b> <i>B. longipes</i> (Reitter)</b> - Pronotum and hypomere entirely black. Elytral disc with punctation entirely very fine, similar to pronotal punctation............................. <b> <i>B. ornatum</i> sp. nov.</b> 8 Elytral punctation to large part much coarser than pronotal punctation........... <b>9</b> - Elytra and pronotum with similar, very fine punctation.................................. <b>10</b> 9 Body black, 3.0 to 3.2 mm long. Mesoventrite with robust mesal ridge. Apical part of parameres delimited by notch.................................... <b> <i>B. grande</i> sp. nov.</b> - Body­length 2.20 to 2.35 mm. Mesoventrite with mesal ridge. Apical part of parameresnotdelimitedby notch...................................... <b> <i>B. striatum</i> sp. nov.</b> 10 Small species, body­length less than 1.8 mm...................... <b> <i>B. maindai</i> sp. nov.</b> - Larger species, body­length exceeding 1.8 mm.............................................. <b>11</b> 11 Elytra with basal striae entire, joined to lateral striae. Mesoventrite usually with distinct mesal ridge......................................................................................... <b>12</b> - Elytra with basal striae interrupted at level of humeral areas, not joined to lateral striae. Mesoventrite with or without mesal ridge............................................ <b>15</b> 12 Parameres each split to form long ventral lobe extended nearly to level of apex of dorsal lobe................................................................................. <b> <i>B. biroi</i> (Pic)</b> - Parameres of not split...................................................................................... <b>13</b> 13 Median lobe of aedeagus with two robust, prominent processes situated mesally, anterior bases of parameres.................................................... <b> <i>B. taurus</i> sp. nov.</b> - Median lobe of aedeagus without ventral processes....................................... <b>14</b> 14 Middle part of parameres not expanded. Mesoventrite very finely striate............................................................................................................ <b> <i>B. basicolle</i> (Pic)</b> - Middle part of parameres expanded to form large lobes. Mesoventrite lacking striae.................................................................................... <b> <i>B. albertisi</i> sp. nov.</b> 15 Metanepisterna broad, about 0.06- 0.07 mm wide. Internal sac of aedeagus with roof­like shaped distal sclerites and pair of proximal angulate, narrow sclerites....................................................................................................... <b> <i>B. loksai</i> Löbl</b> - Metanepisterna narrow, about 0.01- 0.02 mm wide. Internal sac of aedeagus withproximalnarrow, transverse rod...................................... <b> <i>B. glabrum</i> Löbl</b> 16 Mesoventrite lacking mesal ridge. Metanepisterna very narrow, to large part concealed. Parameres narrowed and strongly sclerotized apically................................................................................................................... <b> <i>B. rufulum</i> sp. nov.</b> - Mesoventrite with mesal ridge. Metanepisterna distinct, about 0.04- 0.05 mm wide. Parameres broad and weakly sclerotized apically......... <b> <i>B. riedeli</i> sp. nov.</b>
description: Published as part of <i>Löbl, Ivan, 2021, A review of the Bironium Csiki, 1909 (Coleoptera: Staphylinidae: Scaphidiinae) of New Guinea and the Moluccas, pp. 227-248 in Acta Musei Moraviae 106 (2)</i> on pages 228-229, DOI: 10.5281/zenodo.5706173