PUBLISHED BY THE AMERICAN MUSEUM OF NATURAL HISTORY CENTRAL PARK WEST AT 79TH STREET, NEW YORK, NY 10024 Number 3430, 72 pp., 211 ®gures, 2 tables February 27, 2004 Revision of the Asian Tribe Megarthropsini (Coleoptera: Staphylinidae: Tachyporinae) LEE H. HERMAN1 CONTENTS Abstract ....................................................................... 2 Introduction .................................................................... 2 Abbreviations ................................................................ 2 Megarthropsini ............................................................... 3 Key to Genera of the Megarthropsini ........................................... 7 Megarthropsis ................................................................ 7 Key to Species of Megarthropsis ............................................... 8 Description of Species ....................................................... 10 Nepaliodes .................................................................. 23 Key to Species of Nepaliodes ................................................. 28 Description of Species ....................................................... 29 Peitawopsis ................................................................. 30 Key to Species of Peitawopsis ................................................ 34 Description of Species ....................................................... 34 Lacvietina, new genus ........................................................ 39 Key to Species of Lacvietina .................................................. 43 Description of Species ....................................................... 44 Discussion .................................................................... 54 Acknowledgments ............................................................. 67 References .................................................................... 67 Appendix: Paratachinus laticollis Cameron ....................................... 69 Addendum .................................................................... 72 1 Division of Invertebrate Zoology American Museum of Natural History. e-mail: [email protected] Copyright q American Museum of Natural History 2004 ISSN 0003-0082 2 AMERICAN MUSEUM NOVITATES NO. 3430 ABSTRACT The species and genera of the Megarthropsini are revised. Descriptions and illustrations of the genera and species and keys for identi®cation are presented. Lacvietina, a new genus, with four new species is described. Three of the new species, L. aurora, L. copiosa, and L. cuprina, are from Vietnam, and the fourth, L. paricosta, is from Malaysia and Thailand. Lacvietina punctatissima (Hayashi), from Taiwan, is a new combination and was transferred from Tach- inus. A new species of Nepaliodes, N. solangelae from Thailand and China, is described. Seven new species of Megarthropsis are described; six of them, M. deverra, M. durga, M. empusa, M. frazerensis, M. parca, and M. smetanai, are from Malaysia; the seventh, M. dja- waensis, is from Indonesia. A phylogenetic analysis supports Megarthropsini as a monophy- letic tribe with Deropini as its sister group. Within Megarthropsini, Peitawopsis is the most basal genus to the remaining three genera, and Lacvietina is the sister group to Megarthropsis and Nepaliodes. The tribe is most readily distinguished from other taxa of the Tachyporinae by the densely and coarsely punctate body. Finally, the type species of Paratachinus, P. laticollis Cameron, is redescribed and discussed. Lacvietina takashii is a new combination. INTRODUCTION tribe in the Tachyporinae. In the same article Smetana extended the known range of Me- This revision was prompted by the col- garthropsis from Singapore to Borneo, and lection of some odd specimens of unknown extended that of Nepaliodes from central subfamilial assignment from the mountains Nepal (Bagmati Province) to Uttar Pradesh of western Vietnam in 1998 and 1999. and West Bengal in India. The geographic They turned out to be three undescribed range of the tribe was extended and the an- species of a new genus of the rather anom- atomical diversity increased when Smetana alous Asian tribe of the Tachyporinae, the (1992) added the new monotypic, Taiwa- Megarthropsini. Understanding the position nese genus Peitawopsis; in the same article of the Vietnamese species required exami- Smetana further illustrated Megarthropsis. nation of the other genera of the tribe. This More recently a second (Smetana, 1995a) process led to the discovery of nine other and third species (Herman and Smetana, unnamed species distributed among the 2002) of Peitawopsis, both from Taiwan, other three genera, which until now includ- were named. ed a total of only four species in three gen- The present article describes new taxa, era. presents new distributional data and char- Megarthropsini was proposed by Cam- acters, and discusses the relationships of the eron (1919: 231), who, while providing no Megarthropsini and its components. The characters speci®c to the tribe, presented a treatment of Peitawopsis herein is an expan- detailed description of his new monotypic sion of a review by Herman and Smetana genus from Singapore, Megarthropsis. (2002). The descriptions of Peitawopsis and When the tribe was published it was not P. watanabei, the locality data, and the key assigned to a subfamily, but Cameron to species are included so that this revision- (1919: 232) stated that it appeared to be ary study stands alone and presents a com- related to the ``Trichophyini'' and ``Tach- prehensive and coherent treatment of the yporini''. Later it was placed in the Tach- tribe and its species. yporinae (Cameron, 1921: 349). The tribe included only Megarthropsis, ABBREVIATIONS and neither the tribe nor genus was cited again except in catalogs (Scheerpeltz, 1933: AMNH American Museum of Natural History, 1478; Blackwelder, 1952: 236) until 1983. New York, New York ASC A. Smetana collection, Ottawa, Ontar- Smetana (1983a) moved the monotypic io, Canada Nepalese genus Nepaliodes Coiffait to the CNC Canadian National Collection of In- Megarthropsini, provided detailed descrip- sects, Ottawa, Ontario, Canada tions and numerous illustrations for both GRC G. de Rougemont collection, Londini- genera, and discussed the position of the eÁres, France 2004 HERMAN: MEGARTHROPSINI 3 IEBR Institute of Ecology and Biological Re- sources, Hanoi, Vietnam MHNG MuseÂum d'Histoire Naturelle, GeneÁve, Switzerland MSC Michael SchuÈlke collection, Berlin, Germany NHMW Naturhistorisches Museum Wien, Wien, Austria MEGARTHROPSINI Megarthropsini Cameron, 1919: 231. Type genus: Megarthropsis, ®xed by monotypy. ÐScheerpeltz, 1933: 1478 (world catalog supple- ment).ÐSmetana, 1983a: 142 (characters; dis- cussion; key to genera).ÐSmetana, 1983b: 274 (tribe of Tachyporinae; key to tribes; charac- ters).ÐNewton and Thayer, 1992: 66 (tribe of Tachyporinae).ÐHerman, 2001a: 678 (catalog). DIAGNOSIS: Megarthropsini is distinguished from all tribes of the Tachyporinae by the dense, coarse punctation of the head, prono- tum, and elytra (®gs. 1, 171, 183, 188), the re¯exed, explanate, anterolateral cephalic margin (®gs. 171, 183, 189, 194), and the ventrobasal groove on the median lobe of the aedeagus (®gs. 48, 80, 97, 152). It is separated from other tribes except the Vatesini by the emarginate posterior elytral margin (®gs. 25, 69, 91, 114, 131, 143), and from other tribes but the Deropini by the presence of a neck (®g. 194). DESCRIPTION: Length 2.7±4.9 mm; width 1.1±1.5 mm. Color dark to pale reddish brown and with or without yellowish brown lateral margins of pronotum and elytra. Head with vertex coarsely punctate (®gs. 1, 171, 183, 188); punctures setate. Head with anterolateral margin explanate and weakly to strongly re¯exed from antenna to anterior margin of clypeus (®gs. 171, 183, 189, 194); clypeus with (®g. 184) or with- out (®gs. 189, 194) re¯exed anterior mar- gin. Epistomal suture present and complete (®g. 189) or incomplete (®g. 184); suture, when complete, angulate at middle; mid- cranial suture (®gs. 1, 189) present, well developed or rudimentary, and extending posteriorly from middle of epistomal suture Fig. 1. Lacvietina cuprina. or absent. Postocular lateral margin of head with carina (®gs. 172, 184) or rounded ridge (®gs. 189, 194) extending medially from posterior margin of eye to neck. Neck present and broad (®g. 194). Gular sutures 4 AMERICAN MUSEUM NOVITATES NO. 3430 moderately to widely separated and diver- short, basal, median carina. Tergite VII gent from about middle. Submentum with with palisade fringe of posterior margin coarse punctation or impunctate. Mentum well developed, reduced, or absent. Ter- coarsely punctate. Labial palp three-seg- gites IX divided middorsally by tergum X mented; glossa emarginate medially. Max- (®gs. 13, 73, 119, 144). illary palp four-segmented; fourth segment MALE: Sternites V±VII and sternum VIII long, stout, and fusiform (®gs. 184, 189); variously modi®ed; V±VII with large to galea with dense cluster of apical setae and small rounded lobe on internal surface of an- with row of setae on lateral margin. Man- terior margin (®gs. 3, 4, 11, 87, 95, 108). dible short, broad, and edentate; mola well Sternite VII with (®gs. 4, 77) or without (®g. developed. Antenna long or short and 40) peg setae. Sternum VIII (®gs. 6, 51, 88, reaching to about middle of elytra or ex- 111) with deep, apically wide, basally ta- tending beyond posterior margin; antennal pered, median emargination; narrow basal insertion beneath re¯exed margin of clyp-