Temnelytron, Lawrence, 2019

Lawrence, John F., 2019, Australian Nitidulinae: general review with descriptions of new genera and species (Coleoptera: Nitidulidae), Zootaxa 4657 (2), pp. 261-290 : 279

Temnelytron , gen. nov.

Type species: Temnelytron nigrum , sp. nov.

Diagnosis. This monotypic genus differs from all other nitiduline genera in the distinct excision at the apex of each elytron. It resembles the genera Aethinodes , Gaulodes Erichson, 1843 , Lasiodactylus , Lasiodites , Ostomarcha Kirejtshuk, 2006b , Phenolia and Plesiothina in that 1) the elytra are clothed with dense longitudinal rows of inclined to decumbent megasetae, which are never bristle-like or brush-like, alternating with two or occasionally more rows of microsetae and their associated pits ( Figs 14–15, 18 ) and 2) the anterior edge of the metaventrital lobe is not or only slightly or gradually declined to meet the posterior edge of the mesoventrite. Temnelytron nigrum shares the following characters with one or more of seven genera listed above: 1) vertexal line incomplete at middle ( Gaulodes ); 2) mandible unidentate with a subapical tooth ( Gaulodes , Lasiodactylus , Lasiodites , Plesiothina ); 4) prosternum short- er than procoxal cavities (all except Phenolia and Plesiothina ); 5) mesoventrite without median carina (most genera); 6) axillary spaces relatively small ( Gaulodes , Ostomarcha , Phenolia , Plesiothina ); 7) protibial ridge present in male (most genera); 8) mesotibia not modified in male ( Aethinodes , Ostomarcha , Phenolia , Plesiothina ); 9) basal protarsomeres and mesotarsomeres distinctly widened ( Gaulodes , Plesiothina ); 10) intercoxal process on ventrite 1 more or less truncate ( Aethinodes , Lasiodites ); 11) postcoxal lines on ventrite 1 broadly curved and not extending far from coxal rim ( Gaulodes , Lasiodactylus , Plesiothina ); 12) gonostyli highly reduced and lateral ( Gaulodes ); 13) genital capsule of male with subapical pit ( Gaulodes and Phenolia ). Temnelytron differs from some of the above genera as follows: 1) incomplete vertexal line (complete in most genera, absent in Phenolia ); 2) unidentate mandible (bidentate in Ostomarcha and Phenolia ); 3) anterior pronotal angles produced forward (not in Lasiodactylus ); 4) pronotal microsetae arising from within pits (adjacent to pits in other genera); 5) mesoventrite without median carina (with short carina in Aethinodes ); 6) elytral megasetae gradually narrowed, apically acute, not ribbed ( Fig. 15 ) (similar but with several ribs in Gaulodes and Plesiothina , abruptly narrowed at about middle with fine ribs in Phenolia ); 7) protibial ridge present in male ( Fig. 30 ) (absent in Phenolia ); 8) mesotibia not modified in male (modified in Gaulodes , Lasiodactylus , Lasiodites ); 9) basal protarsomeres and mesotarsomeres distinctly widened (basal protarsomeres only in Aethinodes , Lasiodites , Ostomarcha and Phenolia , all tarsomeres in Lasiodactylus ); 10) weak, broadly curved postcoxal lines on ventrite 1 (well-developed, angulate lines in Aethinodes , no lines in Lasiodites , Ostomarcha and Phenolia ); 11) short, broad, lateral gonostyli ( Fig. 32 ) (elongate, parallel-sided, apical or subapical gonostyli in Aethinodes , Lasiodactylus , Lasiodites , Phenolia , and Plesiothina ; gonostyli absent in Gaulodes and Ostomarcha ); 12) gonocoxites without lateral recurved teeth ( Fig. 79 ) (present in Gaulodes ); 13) genital capsule without subapical, transverse carina ( Fig. 57 ) (present in Aethinodes , Lasiodactylus , Lasiodites , Ostomarcha and Plesiothina ).

Figures

FIGURES 13–30. Morphological details: 13–19, portion of elytral surface: 13, Aenigmoronia echinodes sp. nov. (low); 14–15, Temnelytron nigrum sp. nov. (high): 14, showing microsetae; 15, showing megasetae. 16–17, Thalycrodes pulchrum Blackburn: 16, high; 17, low. 18, Temnelytron nigrum sp. nov. (low). 19, Austronitidula multimaculata sp. nov. (high). 20–21, protibial apex and tarsus: 20, Testudoraea flava Kirejtshuk; 21, Perilopsis flava (Reitter). 22–23, portion of elytral surface: 22, Perilopsis flava (Reitter), 23, Testudoraea flava Kirejtshuk. 24, Aenigmoronia echinodes sp. nov., elytral tuft-like megaseta; 25–30, protibial apex: 25, Austronitidula multimaculata sp. nov., male; 26, Aenigmoronia echinodes sp. nov., male; 27, Pocadius kirejtshuki Cline, male; 28, Thalycrodes pulchrum Blackburn, male; 29, Aenigmoronia echinodes sp. nov., female; 30, Temnelytron nigrum sp. nov., male.

FIGURES 31–46. Morphological details: 31, Austronitidula multimaculata sp. nov., antennal club. 32–33, clypeus and labrum: 32, Perilopsis flava (Reitter); 33, Testudoraea flava Kirejtshuk. 34–35, junction of vertex and occiput: 34, Aenigmoronia echinodes sp. nov.; 35, Australycra obscura (Blackburn). 36–38, labrum-epipharynx: 36, Austronitidula multimaculata sp. nov.; 37, Cychramus slendidus sp. nov.; 38, Cychramus picticollis Lea. 39, Austronitidula multimaculata sp. nov., left side of head, dorsal; 40, Aenigmoronia echinodes sp. nov., apex of labial palp; 41–42, mentum: 41, Cychramus splendidus sp. nov.; Cychramus picticollis Lea. 43–46, portion of elytral surface: 43, Australycra obscura (Blackburn); 44, Australycra similis sp. nov.; 45, Austronitidula multimaculata sp. nov.; 46, Aenigmoronia echinodes sp. nov.

FIGURES 79–92. Morphological details: 79–80, gonocoxites, ventral: 79, Temnelytron nigrum sp. nov.; 80, Physoronia explanata Reitter. 81–82, apex of penis, dorsal: 81, Australycra obscura (Blackburn); 82, Australycra similis sp. nov. 83, Austronitidula multimaculata sp. nov., mesotibial apex. 84–85, apex of tegmen, dorsal: 84, Aenigmoronia echinodes sp. nov.; 85–86, Australycra obscura (Blackburn), tegmen, dorsal: 85, apex; 86, entire tegmen. 87, Temnelytron nigrum sp. nov., apex of tegmen, dorsal. 88–89, Australycra similis sp. nov., tegmen, dorsal: 88, apex; 89, entire tegmen. 90, Austronitidula multimaculata sp. nov., tegmen, dorsal. 91–92, Australycra species, tegmen and penis lateral: 91, A. obscura (Blackburn); 92, A. similis sp. nov.

FIGURES 47–62. Morphological details: 47–49, Lasiodites howensis sp. nov., female, portions of reduced hind wing: 47, apex; 48, subapex; 49, subbase. 50. Perilopsis flava (Reitter), central portion of abdominal ventrite 5 in male. 51–52, median plate of larval abdominal tergum: 51, Perilopsis flava (Reitter); 52, Testudoraea flava Kirejtshuk. 53–54, left side of first abdominal tergum: 53, Testudoraea flava Kirejtshuk; 54, Perilopsis flava (Reitter). 55–57, apex of male genital capsule (tergite VIII), dorsal: 55, Aenigmoronia echinodes, sp. nov.; 56, Austronitidula multimaculata sp. nov.; 57, Temnelytron nigrum sp. nov. 58–62, ventral plate of abdominal segment IX: 58, Aenigmoronia echinodes sp. nov.; 59, Australycra obscura (Blackburn); 60, Australycra similis sp. nov.; 61, Austronitidula multimaculata sp. nov.; 62, Temnelytron nigrum sp. nov.