Micridium thayerae, Darby, Michael, 2017

Darby, Michael, 2017, Taxonomic review of the genera Micridium Motschulsky, 1869 and Micridina Johnson, 1969 (Coleoptera: Ptiliidae) with eleven new species including the first records from South America and Madagascar, Zootaxa 4242 (2), pp. 233-254 : 251

publication ID	https://doi.org/10.11646/zootaxa.4242.2.2
publication LSID	lsid:zoobank.org:pub:0DD1868D-4EF5-4FB7-AEE9-372644800A79
DOI	https://doi.org/10.5281/zenodo.6045229
persistent identifier	https://treatment.plazi.org/id/03E64B08-E33A-FFE6-8585-5B2DFC5EEE17
treatment provided by	Plazi (2017-03-10 08:26:22, last updated 2024-11-26 07:04:06)
scientific name	Micridium thayerae
status	sp. nov.

Treatment

Micridium thayerae View in CoL sp.n.

( Figs. 14 View FIGURES 1 – 14 , 24 View FIGURES 17 – 32 , 41 View FIGURES 33 – 41 , 43 View FIGURES 42 – 46 , 54 View FIGURES 47 – 60 , 62 View FIGURES 61 – 71 , 79 View FIGURES 72 – 81 , 86a/b, 93)

Habitus Fig. 14 View FIGURES 1 – 14 . Length 0.70 mm. Colour brown, legs and antennae pale yellow, covered with long yellow overlapping pubescence. Antennomeres 3–11 length 0.22 mm, Fig. 43 View FIGURES 42 – 46 . Width across eyes 0.19 mm. Mentum almost square, the two long setae normally situated at the anterior corners are placed medially close to the lateral margins, submentum with 4 setae, Fig. 41 View FIGURES 33 – 41 . Pronotum without linear depressions but with clearly marked shallow pits at sides of disc in posterior half, length 0.17 mm, width 0.26 mm, Fig. 24 View FIGURES 17 – 32 . Elytra length 0.47 mm, width 0.30 mm. Mesoventrum: keel slightly widened between mesocoxae Fig. 54 View FIGURES 47 – 60 . Mesepiventra: clearly reticulate, evenly rounded to mesocoxae, Fig. 54 View FIGURES 47 – 60 . Metaventrum: metepiventral sutures short reaching only 1/3 of the length of the sclerite, Fig. 62 View FIGURES 61 – 71 .

Male: posterior intercoxal process of metaventrum with fringe of long, flattened setae, Fig. 93. Aedeagus Fig. 86a/b.

Female: spermatheca Fig. 79 View FIGURES 72 – 81 .

Etymology. Named after Dr Margaret Thayer, the collector.

Diagnosis. The reticulation of the mesoventrum, very short metepiventral sutures and square mentum distinguish this species.

Type data: Holotype: ♂, Chile, Osorno Pr., Los Lagos, Parque Nac. Puyehue, Antillanca road, Valdivian rainfor., forest leaf and log litter, 470m, 20–25.xii.1982, A. Newton & M. Thayer ( FMNH) . Paratypes: 350 examples, same data as holotype ( FMNH, BMNH) ; 19 examples, Chile, Osorno Pr., hills S of Muicolpué, secondary Valdivian forest , 160m, 21.12.82, A. Newton & M. Thayer ( BMNH) ; 101 examples, Chile, Osorno Pr., Parque Nac. Puyehue, 4.1 km E Anticura, trap site 662, Valdivian rainfor., forest leaf and log litter, Berlese , 430m, 19–26.xii.1982, A. Newton & M. Thayer ( FMNH, BMNH) ; 4 examples, Chile, Osorno Pr., Parque Nac Puyehue, Antillanca Road, trap site 661, Valdivian rainfor., forest leaf and log litter, Berlese , 690m, 18–24.xii.1982, A. Newton & M. Thayer ( BMNH) ; 2 examples, Chile, Valdivia Pr., 4.1km W Anticura, trap site 663, Valdivian rainfor., leaf litter on forest floor, 160m, A. Newton & M. Thayer ( FMNH) .

Figures

FIGURES 1 – 14. Micridium habitus. 1. M. angulicolle (Fairmaire) 2. M. halidaii (Matthews) 3. M. vittatum Motschulsky 4. M. lineatum Le Conte 5. M. rhodeanum (Casey) 6. M. hilli (Johnson) 7. M. johnsoni sp. n. 8. M. elegans sp. n. 9. M. oweni sp. n. 10. M. attenboroughi sp. n. 11. M. boliviense sp. n. 12. M. newtoni sp. n. 13. M. foveatum sp. n. 14. M. thayerae sp. n. 15. M. proprium sp. n. 16. M. quadridens sp. n.

FIGURES 17 – 32. Micridium pronotums. 17. M. quadridens sp. n. x 605. 18. M. inornatum sp. n. x 590. 19. M. boliviense sp. n. x 625. 20. M. newtoni sp. n. x 695. 21. M. foveatum sp. n. x 830. 22. M. johnsoni sp. n. x 790. 23. M. elegans sp. n. x 810. 24. M. thayerae sp. n. x 650. 25. M. halidaii (Matthews) x 770. 26. M. hilli (Johnson) x 740. 27. M. oweni sp. n. x 575. 28. M. attenboroughi sp. n. x 675. 29. M. angulicolle (Fairmaire). 30. M. rhodeanum (Casey) 31. M. vittatum Motschulsky 32. M. lineatum Le Conte.

FIGURES 33 – 41. Micridium mentums. 33. M. oweni sp. n. x 1420. 34. M. attenboroughi sp. n. x 1840. 35. M. boliviense sp. n. x 1280. 36. M. elegans sp. n. x 1320. 37. M. proprium sp. n. x 2360. 38. M. quadridens sp. n. x 1900. 39. M. johnsoni sp. n. x 1600. 40. M. foveatum sp. n. x 1220. 41. M. thayerae sp. n. x 1160.

FIGURES 42 – 46. Micridium antennae. 42. M. quadridens sp. n. showing more rounded antennomeres on shorter antennae. 43. M. thayerae sp. n. 44. M. elegans sp. n. showing more elongate antennomeres. 45. M. johnsoni sp. n. x 2000 antennomeres 9 – 11 showing single sensillae on 10 & 11. 46. M. foveatum sp. n. x 1800 antennomeres 10 & 11 showing branched sensillae.

FIGURES 47 – 60. Micridium mesoventra. 47. M. inornatum sp. n. x 540. 48. M. quadridens sp. n. x 710. 49. M. boliviense sp. n. x 695. 50. M. attenboroughi sp. n. x 870. 51. M. proprium sp. n. x 920. 52. M. newtoni sp. n. 53. M. johnsoni sp. n. x 655. 54. M. thayerae sp. n. x 860. 55. M. halidaii (Matthews) x 615. 56. M. oweni sp. n. x 585. 57. M. elegans sp. n. x 705. 58. M. hilli (Johnson) x 760. 59. M. foveatum sp. n. x 1300. 60. M. rhodeanum (Casey) x 545.

FIGURES 61 – 71. Micridium metepiventral sutures. 61. M. johnsoni sp. n. x 530. 62. M. thayerae sp. n. x 505. 63. M. attenboroughi sp. n. x 670. 64. M. foveatum sp. n. x 735. 65. M. quadridens sp. n. x 710. 66. M. elegans sp. n. x 730. 67. M. oweni sp. n. x 585. 68. M. hilli (Johnson) x 760. 69. M. halidaii (Matthews) x 615. 70. M. newtoni sp. n. x 710. 71. M. rhodeanum (Casey) x 545.

FIGURES 72 – 81. Micridium spermathecae. 72 a / b. M. attenboroughi sp. n. 73. M. boliviense sp. n. 74. M. elegans sp. n. 75. M. foveatum sp. n. 76. M. halidaii (Matthews) (may have been broken or distorted in preparation). 77 a / b. M. johnsoni sp. n. 78. M. hilli (Johnson) 79. M. thayerae sp. n. 80. M. inornatum sp. n. 81. M. newtoni sp. n.