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Acrostichus megaloptae n. sp. (Nematoda: Diplogastridae), a phoretic associate of Megalopta spp. (Hymenoptera: Halictidae) in Central America

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For more content, see Nematologica.

Adults of the dusk-flying and rotting wood-nesting bees Megalopta genalis and/or M. ecuadoria were collected at Barro Colorado Island, The Smithsonian Tropical Research Institute (BCI, STRI), Panama and La Selva, Costa Rica, and examined for nematodes. Nematodes were recovered as dauer juveniles from the Dufour's gland of female bees and aedeagus of male bees. Adult nematodes isolated from M. genalis (BCI and La Selva) and M. ecuadoria (BCI) were successfully cultured and kept in the laboratory. All three populations were used for morphological observations and molecular analyses and were identified as a new species that is described herein as Acrostichus megaloptae n. sp. It is characterised by its stomatal morphology, possession of six triangular cuticle flaps covering stomatal opening, duplicated cheilo- and gymnostomatal walls, large dorsal tooth and sclerotised ventral stegostomatal ridges, female with vulval flap, male spicule and gubernaculum morphology, i.e., relatively straight spicule with oval-shaped manubrium, rounded flap-like rostrum and separated and strongly ventrally curved spicule with bifurcate tip, gubernaculum L-shaped in lateral view and anchor-shaped in ventral view, and filiform tail of both sexes. Sequences from the three A. megaloptae n. sp. geographical/host isolates were not significantly different and molecular phylogenetic analysis and biological and morphological comparisons place the new species close to A. halicti from Halictus ligatus and A. puri from Augochlora pura from North America, although the new species is distinguished from A. halicti and A. puri based upon its stomatal morphology of males and females, male spicule and gubernaculum morphology and female vulval structure.

Affiliations: 1: Fort Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA; Forest Pathology Laboratory, Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan; 2: Fort Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA; 3: Smithsonian Tropical Research Institute, Box 0843-03092, Balboa, Ancon, Republic of Panama; 4: Fort Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA; Zhongkai University of Agriculture and Engineering, Department of Plant Protection, Guangzhou 510225, People's Republic of China; 5: Fort Lauderdale Research and Education Center, University of Florida/IFAS, 3205 College Avenue, Davie, FL 33314, USA; Hubbard Center for Genome Studies, University of New Hampshire, 35 Colovos Road, Durham, NH 03824, USA; Nematode Assay Section, Agronomic Division, North Carolina Department of Agriculture & Consumer Services, 4300 Reedy Creek Road, Raleigh, NC 27607, USA; 6: Universidad Nacional, Escuela de Ciencias Agrarias, Laboratorio de Nematologia, Apto. 86-3000, Heredia, Costa Rica; 7: Hubbard Center for Genome Studies, University of New Hampshire, 35 Colovos Road, Durham, NH 03824, USA

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/content/journals/10.1163/138855409x12559479585089
2010-05-01
2016-12-05

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