Three new species of Goera Stephens (Trichoptera: Goeridae) from Sulawesi, Indonesia

Three new species of the caddisfly genus Goera Stephens (Trichoptera: Goeridae) are described from the Indonesian island of Sulawesi. Goera neboissi sp. n., G. jolanda sp. n., and G. higleri sp. n. were found to be related to G. skiasma Neboiss, which is the only previously recorded species from Sulawesi. These species share the following combination of characters: an upright IXth segment; the absence of the median dorsal process of tergum X; a long, mesal process of the inferior appendage with a subbasal projection; and, the absence of parameres

The genus Psilotreta Banks (Trichoptera: Odontoceridae) in Vietnam

Eight species of the genus Psilotreta Banks (Trichoptera: Odontoceridae) are currently known from Vietnam: P. albogera Mey 1997, P. androconiata Mey 1997, P. bidens Mey 1995, P. enikoae Oláh and Johanson 2010, P. frigidaria Mey 1996, P. jaroschi Malicky 1995, P. papaceki Malicky 1995, P. spitzeri Malicky 1995. A new species, Psilotreta kurenschikovorum, from Thua Thien-Hue Province is herein described. The new species differs from other species of the genus by peculiarities in wing venation, by the unusual shape of epicranial suture on the head, and by the bifid apical segment of the inferior appendage. Additional province and collection information for previously recorded species are included

Interesting species of the genus Helicopsyche von Siebold (Trichoptera: Helicopsychidae) from Vietnam

Three new species of the genus Helicopsyche von Siebold (Trichoptera: Helicopsychidae), H. botosaneanui, H. verrucaspinosa, and H. inusitata, from Vietnam are described, and 1 new country record, H. pathoumthongi Johanson and Malm, is reported. The male of H. boniata Malicky and Chantaramongkol is redescribed to facilitate comparisons with two of the new species

Two new species of the genus Pahamunaya Schmid (Trichoptera: Polycentropodidae) from Vietnam

Two new species of the genus Pahamunaya Schmid (Trichoptera: Polycentropodidae), P. talon sp. n. and P. spinifera sp. n., from Vietnam are described and illustrated. Examination of the holotype male of P. khoii Oláh and Johanson, in combination with an additional specimen of the same species, revealed new characters. New illustrations for this species are provided

Additions to the genus Goera Stephens (Trichoptera, Goeridae) from Southeast Asia

Two new species of Goera, G. zwicki and G. nozakii (Trichoptera, Goeridae), from the Philippines and one new species, G. meyi, from Vietnam are described and illustrated herein. In addition, type specimens of G. disparilis Banks, G. octospina Banks, G. tagalica Banks, and G. uniformis Banks are illustrated. All species of Goera known from both the Philippines and Vietnam are listed

The genus Chimarra Stephens (Trichoptera: Philopotamidae) in Vietnam

Currently, the genus Chimarra Stephens (Trichoptera: Philopotamidae) is represented in the Oriental Region by 259 species. Of these, 61 species have been described or recorded from Vietnam. In this paper, 9 new species from Vietnam are described and illustrated (Chimarra aculeata, C. carinata, C. corneola, C. insolita, C. mina, C. prominens, C. rostrata, C. undulata, and C. ungula). In addition, 3 new country records are noted (Chimarra areli Malicky and Mey, Chimarra pipake Malicky and Chantaramongkol, and Chimarra suthepensis Chantaramongkol and Malicky), and 1 new species group (minuta Group) is proposed and populated. An additional species group (georgensis “Group”), with 1 new species from Vietnam, but otherwise only known from Africa, is discussed, but not formally defined. A table listing all known Vietnamese species of Chimarra is included, along with discussion of variability in the anal veins of the forewing found within this genus, and its relevance for defining subgenera and species groups

Tilted accretion discs in cataclysmic variables: tidal instabilities and superhumps

We investigate the growth of tidal instabilities in accretion discs in a binary star potential, using three dimensional numerical simulations. As expected from analytic work, the disc is prone to an eccentric instability provided that it is large enough to extend to the 3:1 resonance. The eccentric disc leads to positive superhumps in the light curve. It has been proposed that negative superhumps might arise from a tilted disc, but we find no evidence that the companion gravitational tilt instability can grow fast enough in a fluid disc to create a measurable inclination. The origin of negative superhumps in the light curves of cataclysmic variables remains a puzzle.Comment: 7 pages, 7 figures, accepted for publication in MNRA

The Trichoptera of Panama. XII. Contributions to the family Glossosomatidae (Insecta: Trichoptera) in Panama

Herein we describe five new species in the trichopteran family Glossosomatidae Wallengren (Insecta: Trichoptera) from Panama: Mortoniella calovebora Blahnik and Armitage, n. sp., M. yayas Blahnik and Armitage, n. sp., Protoptila inflata Blahnik and Armitage, n. sp., P. totumas Blahnik and Armitage, n. sp., and P. rambala Blahnik and Armitage, n. sp. Three of the species were collected as part of ongoing biological surveys of Panama’s national parks. We also record three new country records for Panama for this family: Culoptila costaricensis Flint, 1974, Mortoniella opinionis Blahnik and Holzenthal, 2008, and Protoptila spirifera Flint, 1974. Thirty-one species of glossosomatid caddisflies, nine of them endemic, are now known from Panama

Phase Transitions and superuniversality in the dynamics of a self-driven particle

We study an active random walker model in which a particle's motion is determined by a self-generated field. The field encodes information about the particle's path history. This leads to either self-attractive or self-repelling behavior. For self-repelling behavior, we find a phase transition in the dynamics: when the coupling between the field and the walker exceeds a critical value, the particle's behavior changes from renormalized diffusion to one characterized by a diverging diffusion coefficient. The dynamical behavior for all cases is surprisingly independent of dimension and of the noise amplitude.Comment: 14 pages, 4 figure