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Revision of the Neotropical Neurigoninae (Diptera: Dolichopodidae) IV: Viridigona Gen

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Revision of the Neotropical Neurigoninae (Diptera: Dolichopodidae) IV: Viridigona Gen NAGLIS: 561604 Studia dipterologica 9 (2002) Heft 2 ɀ ISSN 0945-3954 Revision of the Neotropical Neurigoninae (Diptera: Dolichopodidae) IV: Viridigona gen. nov. [Revision der neotropischen Neurigoninae (Diptera: Dolichopodidae) IV: Viridigona gen. nov.] by Stefan M. NAGLIS Zurich (Switzerland) Abstract The Neotropical species of Viridigona gen. nov. (Diptera: Dolichopodidae) are revised. Diag- noses and keys to the species and species-groups are given. The following species are de- scribed as new: V. albisigna spec. nov. (Peru, Venezuela), V. amazonica spec. nov. (Brazil, Venezuela), V. argyrotarsis spec. nov. (Costa Rica), V. asymmetrica spec. nov. (Costa Rica), V. beckeri spec. nov. (Brazil), V. bisetosa spec. nov. (Chile), V. cecilia spec. nov. (Costa Rica), V. costaricensis spec. nov. (Costa Rica), V. flavipyga spec. nov. (Costa Rica), V. guana spec. nov. (Costa Rica), V. limona spec. nov. (Costa Rica), V. longicornis spec. nov. (Chile), V. longiseta spec. nov. (Belize, Brazil), V. magnifica spec. nov. (Brazil, Peru, Venezuela, Costa Rica), V. merzi spec. nov. (Chile, Argentina), V. mexicana spec. nov. (Mexico), V. minima spec. nov. (Mexico, Panama, Costa Rica), V. nigrisigna spec. nov. (Panama, Costa Rica), V. panamensis spec. nov. (Panama), V. papallacta spec. nov. (Ecuador), V. ponti spec. nov. (Brazil), V. puntarena spec. nov. (Costa Rica), V. rondinha spec. nov. (Brazil, Bolivia), V. subrondinha spec. nov. (Brazil), V. teutonia spec. nov. (Brazil), V. tinalandia spec. nov. (Ecuador). Neurigona viridis VAN DUZEE and Neurigona thoracica VAN DUZEE are transferred to Viridigona. Neurigona cinereicollis VA N DER WULP and Neurigona lamprostethus PHILIPPI are regarded as nomina dubia. Viridigona is differentiated from the closely related genus Neurigona mainly by plesiomorphic conditions such as a metallic green body, and by autapomorphies involving the reduction or loss of leg setation. Key words Dolichopodidae, Neurigoninae, Viridigona, revision, new genus, new species, Neotropical Region Zusammenfassung Die neotropischen Arten von Viridigona gen. nov. (Diptera: Dolichopodidae) werden revi- diert. Diagnosen und Schlüssel für die Arten und Art-Gruppen werden dargestellt. Die folgen- den Arten werden neu beschrieben: V. albisigna spec. nov. (Peru, Venezuela), V. amazonica spec. nov. (Brasilien, Venezuela), V. argyrotarsis spec. nov. (Costa Rica), V. asymmetrica spec. nov. (Costa Rica), V. beckeri spec. nov. (Brasilien), V. bisetosa spec. nov. (Chile), V. cecilia spec. nov. (Costa Rica), V. costaricensis spec. nov. (Costa Rica), V. flavipyga spec. nov. (Costa Rica), V. guana spec. nov. (Costa Rica), V. limona spec. nov. (Costa Rica), V. longicornis spec. nov. (Chile), V. longiseta spec. nov. (Belize, Brasilien), V. magnifica spec. nov. (Brasili- en, Peru, Venezuela, Costa Rica), V. merzi spec. nov. (Chile, Argentinien), V. mexicana spec. nov. (Mexiko), V. minima spec. nov. (Mexiko, Panama, Costa Rica), V. nigrisigna spec. nov. (Panama, Costa Rica), V. panamensis spec. nov. (Panama), V. papallacta spec. nov. (Ecu- ador), V. ponti spec. nov. (Brazil), V. puntarena spec. nov. (Costa Rica), V. rondinha spec. nov. (Brasilien, Bolivien), V. subrondinha spec. nov. (Brasilien), V. teutonia spec. nov. (Brasilien), V. tinalandia spec. nov. (Ecuador). Neurigona viridis VAN DUZEE und Neurigona thoracica VAN DUZEE werden zu Viridigona transferiert. Neurigona cinereicollis VA N DER WULP und Neurigona lamprostethus PHILIPPI werden als nomina dubia behandelt. Viridigona unterschei- det sich von der nahe verwandten Gattung Neurigona hauptsächlich durch plesiomorphe Merk- male, wie zum Beispiel dem metallisch grünen Körper und durch Autapomorphien, welche die Reduktion oder den Verlust der Beborstung der Beine betreffen. Stichwörter Dolichopodidae, Neurigoninae, Viridigona, Revision, neue Gattung, neue Arten, neotropische Region 561 NAGLIS: Revision of the Neotropical Neurigoninae IV. Introduction This is the fourth part of a revision of the Neotropical Neurigoninae, dealing with the new genus Viridigona gen. nov. of the tribe Neurigonini. The preceding parts of this revision treated the tribe Coeloglutini (NAGLIS 2001a) comprising the genera Coeloglutus ALDRICH, Neotonnoiria ROBINSON, and Paracoelogluts NAGLIS, the tribe Dactylomyiini (NAGLIS 2001b) including the genera Argentinia PARENT, Dactylomyia ALDRICH, Macrodactylomyia NAGLIS, and Systenoides NAGLIS, and a first contribution to the tribe Neurigonini (NAGLIS 2002) in- cluding the genus Bickelomyia NAGLIS. =or a general introduction see NAGLIS (2001a). The large genus Neurigona RONDANI currently contains 122 described species and is worldwide in distribution. The genus forms a heterogeneous assemblage of species with neurigonine- like characters, and so a separation of the monophyletic groups based on phylogenetic analysis has become necessary. The genera and species outside the Neotropics, especially the Nearctic species of Neurigona, could not be taken into consideration in this revision. Material and methods This revision is based on material belonging to the following institutions: The American Mu- seum of Natural History, New York (AMNH); The Natural History Museum, London (BMNH); California Academy of Sciences, San =rancisco (CAS); Biosystematics Research Institute, Agriculture Canada, Ottawa (CNC); Deutsches Entomologisches Institut, Eberswalde (DEI); Essig Museum of Entomology, University of California, Berkeley (EMEC); Instituto Nacional de Biodiversidad, Costa Rica (INBio); Instituto Nacional de Pesquisas da Amazonia, Manaus (INPA); Museum of Comparative Zoology, Harvard University, Massachusetts (MCZ); Mar- tin-Luther-Universität, Halle a. S. (MLUH); Zoological Museum, University of Helsinki, Hel- sinki (MZH=); Museum of Zoology, Lund University, Lund (MZLU); Museu de Zoologia, Universidade de Sao Paulo, Sao Paulo (MZSP); Naturhistorisches Museum, Vienna (NMW); Staatliches Museum für Tierkunde, Dresden (SMTD); Texas A&M University, College Sta- tion, Texas (TAMU); National Museum of Natural History, Smithsonian Institution, Washing- ton D.C. (USNM); The James Entomological Collection, Washington State University, Pull- man (WSU); Museum für Naturkunde der Humboldt-Universität, Berlin (ZMHB). The original label text of all the specimens examined is given, and multiple labels are sepa- rated by a slash ( / ). The following measurements are used and are in millimeters: body length is measured from the base of the antennae to the tip of the sixth or seventh abdominal segment; thorax length from the prothorax to the posterior border of the postnotum; abdo- men length from the base of segment 1 to the tip of segment 7; wing length from the wing base to the wing apex. The following ratios are used: ratio of length of ocellar setae to vertical setae; ratio of narrowest distance between eyes on face to distance between ocellar setae; ratio of length of arista to length of first flagellomere; ratio of narrowest/widest dis- tance between eyes on frons (measured below ocellar tubercle and above base of antennae); ratio of narrowest/widest distance between eyes on face; ratio of narrowest/widest distance between eyes on clypeus; ratio of length of posterior ac to distance between ac rows; ratio of length of lateral scutellar setae to medians; ratio of podomeres of femur, tibia, tarsomere 1/2/3/4/5; ratio of length of crossvein dm-cu to distance between R and M at wing apex; 4+5 ratio of length of crossvein dm-cu to distal section of CuA (= CuAx ratio according to BICKEL 1998). The morphological terminology follows mainly MCALPINE (1981) and the hypopygial terminology BICKEL (1998), which refers to the position prior to deflection and rotation of the hypopygium; this means that dorsal is below and ventral above in the illustra- 562 Studia dipterologica 9 (2002) Heft 2: 561604 tions. Common features are listed in the generic diagnosis and are not usually repeated in the species descriptions. Species descriptions of the principal species of a species-group are given in full, whereas species descriptions of the remaining species of a species-group are reduced and are confined to differences or significant characters. The following abbreviations are used: MSSC = male secondary sexual character(s); I = pro- thoracic leg; II = mesothoracic leg; III = metathoracic leg; ac = acrostichal setae; ad = antero- dorsal; av = anteroventral; C = coxa; dc = dorsocentral setae; DSur = dorsal surstylar lobe; dv = dorsoventral; = = femur; hm = postpronotal setae; LEp = lateral epandrial lobe; MEp = median epandrial lobe; np = notopleural setae; pa = postalar setae; pd = posterodorsal; pm = presutural supra-alar setae; ppl = proepisternal setae; pv = posteroventral; sa = postsutural supra-alar setae; sr = presutural intra-alar setae; T = tibia; t = tarsus; t -t = tarsomeres 1 to 5; 1 5 VSur = ventral surstylar lobe. Systematic account Key to genera of Neotropical Neurigonini The key includes all Neotropical genera of the tribe Neurigonini. Keys to genera of the tribes Coeloglutini and Dactylomyiini are provided in NAGLIS (2001a, 2001b). 1. Thorax strongly elongated; abdomen about as long as thorax and dorsoventrally flat- tened; vertex excavated dorsally between vertical seta and ocellar tubercle; male It 5 with a ventral comb of short blunt spines; arista subapical; hypopygium partially hid- den under segment 5 or 6, surstylus fused into a single lobe .................. Coeloglutini Thorax not elongated; abdomen usually longer than thorax and cylindrical; vertex not excavated; male fore tarsomeres not
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