It is well known that relations in the tautological ring of moduli spaces of pointed stable curves give partial differential equations for Gromov-Witten invariants of compact symplectic manifolds. These equations do not depend on the target symplectic manifolds and therefore are called universal equations for Gromov-Witten invariants. In the case that the quantum cohomology of the symplectic ma...

Gross and Rosen asked if the genus of a 2-dimensional complex K embeddable in some (orientable) surface is equal to the genus of the graph of appropriate barycentric subdivision of K. We answer the nonorientable genus and the Euler genus versions of Gross and Rosen's question in affirmative. We show that this is not the case for the orientable genus by proving that taking blog2 gcth barycentric...

Three new species and one new genus of Uropodina from Tanzania are described and illustrated. They include the second species of the genus Bloszykiella Kontschán, 2010, Bloszykiella grebennikovi sp. nov., and the resurrection and re-definition of the genus Spinosissuropoda Hirschmann, 1979, with description of a new species, Spinosissuropoda tanzanica sp. nov. Five species of Uropoda are transf...

The nematode Pseudoplatycoma malaysianis n. gen. n. sp. is described from the Sulu Sea (Malaysia). The new genus is classified in the subfamily Platycominae Platonova 1976. Revision of the new genus and four other genera in Platycominae, resulted in four species from the genus Platycomopsis being transferred to other genera: P. dimorphica and P. mazjatzavi to the genus Platycoma; P. effilata to...

This paper is devoted to extend some well-known facts on the genus of a surface and on the Heegaard genus of a 3-manifold to manifolds of arbitrary dimension. More precisely, we prove that the genus of non-orientable manifolds is always even and we compare the genus of a manifold with the rank of its fundamental group and with the genus of its boundary.

Ayurakitia, previously treated as a subgenus of genus Aedes, is restored as a genus in tribe Aedini of family Culicidae. Rationale for this action is discussed. The genus includes 2 species (griffithi and peytoni) and has been reported from Southeast Asia. The most distinctive features of the genus are listed. A revised and expanded definition of the genus and illustrations of the female and ma...

Neorhaphiomidas Norris, with 7 species, is an endemic genus and the only Australian representative of the mydid subfamily Megascelinae. The genus was for many years considered to be restricted to Western Australia but the range of the genus was extended to the eastern part of South Australia with Paramonov's (1961) description of N. inermis. The new species described here, the first record of t...

three threidiid spiders of the genus latrodectus occur in khorasan province: l.tredecimguttatus, l.pallidus, l.dahli. the three are described, their diagnostic features are illustrated, and taxonomic notes are given where possible. spider bites are very common in these regions, so, further notes about the medical importance of these species are given. a dichotomic key to the species of the genu...

among the recently collected chalcidoid wasps in a rice field of eastern guilan province (coast of caspian sea), in july 2012, there was a specimen of pteromalidae belonging to the genus callitula. it was identified as callitula ferrierei (bouček, 1964). both genus and species are new record for iranian fauna. morphological characters and geographical distribution of the newly recorded species ...

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