Xiphovelopsis, a new South American genus of Microveliinae (Hemiptera, Heteroptera, Gerridae), with the description of a new species.

Semiaquatic bugs of the subfamily Microveliinae (Hemiptera, Heteroptera, Gerridae) live in a wide range of habitats, including streams, rivers, lakes, lagoons, estuaries, mangroves, caves, crab holes, tree holes and bromeliads. A total of 120 species has been recorded from the Neotropical region, of which 11 bear modified pretarsal structures on the middle leg. They belong to the genera Euvelia Drake, 1957 (seven Neotropical species), Husseyella Herring, 1955 (three Neotropical species), and Xiphovelia Lundblad, 1933 (mainly Asian genus with one Neotropical species assigned to it).

A synopsis of the genus Cylindrostethus Fieber 1861 (Insecta: Hemiptera: Gerridae).

Cylindrostethus Fieber, 1861 is one of the most striking genera of water striders (Insecta: Hemiptera: Gerridae) and has Pantropical distribution. Members of this group can be recognized by the very long, cylindrical body; the short antennomere IV; the short labium not reaching the mesosternum; and by characteristics of the abdomen of males and females. Although Neotropical representatives of the genus have been revised, there are pending taxonomic issues related to this fauna, and that of the Eastern Hemisphere has been barely studied in recent years.

Descriptions of new species and new records of water bugs (Hemiptera: Heteroptera: Gerromorpha & Nepomorpha) from southeastern Brazil.

Although most of the diversity of true bugs (Hemiptera: Heteroptera) is terrestrial, over 550 species of water bugs (Heteroptera: Gerromorpha, Leptopodomorpha & Nepomorpha) have been recorded from Brazil alone. Southeastern Brazil, composed of the states of Esprito Santo, Minas Gerais, Rio de Janeiro and So Paulo, is the best studied region of the country, but there are still knowledge gaps in the area. Here, two new species are described from Esprito Santo: Hydrometra ruschii Cordeiro, Rodrigues & Moreira, sp.

New species, new records and key to the species of the group (Hemiptera, Heteroptera, Veliidae) from Brazil.

Background: Mayr, 1865 (Hemiptera, Heteroptera, Veliidae), known as riffle bugs, includes more than 400 species and is commonly found in tropical lotic environments, including coastal marine habitats, such as mangroves and estuaries. Due to the elevated number of species, the fauna from the Americas has been divided into several groups, which facilitates taxonomic studies. Amongst them, the group currently includes two species from the Greater Antilles and five from south-eastern and southern Brazil.

Revision of Potamobates Champion, 1898 (Hemiptera: Heteroptera: Gerridae) and description of a new genus for P. thomasi Hungerford, 1937.

Potamobates Champion, 1898 (Hemiptera: Heteroptera: Gerridae) heretofore included 18 species distributed from southern Mexico to Peru. They display a distinct morphology, especially regarding the projections of abdominal segment VIII. Specific identification and delimitation are difficult, and the genus lacks a thorough revision and evaluation of inter- and intraspecific variation.

Transcriptome-based Phylogeny of the Semi-aquatic Bugs (Hemiptera: Heteroptera: Gerromorpha) Reveals Patterns of Lineage Expansion in a Series of New Adaptive Zones.

Key innovations enable access to new adaptive zones and are often linked to increased species diversification. As such, innovations have attracted much attention, yet their concrete consequences on the subsequent evolutionary trajectory and diversification of the bearing lineages remain unclear. Water striders and relatives (Hemiptera: Heteroptera: Gerromorpha) represent a monophyletic lineage of insects that transitioned to live on the water-air interface and that diversified to occupy ponds, puddles, streams, mangroves and even oceans.

Revision of the American genus Steinovelia Polhemus amp; Polhemus, 1993 (Heteroptera: Gerromorpha: Veliidae).

The genus Steinovelia Polhemus Polhemus, 1993 is distributed from southeastern Canada to northeastern Argentina and has been considered to contain five valid species: S. permista (Drake, 1951a), S. placida (Drake, 1951a), S.

Altavelia, a new genus of Neotropical Veliinae (Heteroptera: Gerromorpha: Veliidae), with a key to species and descriptions of four new species from Colombia.

The new genus Altavelia Polhemus Moreira (Heteroptera: Gerromorpha: Veliidae) includes seven species previously contained in the inveruglas group of Paravelia Breddin, 1898 and four new species from Colombia: A. altoandina Molano Morales, A. antioquia Molano Morales, A.

A new species of Mesovelia (Heteroptera: Gerromorpha: Mesoveliidae) from South America, with identification key and notes on Colombian species.

Mesovelia tuberculata sp. nov. is described and illustrated based on material from the Pacific Region of Colombia.

A new species of Oiovelia (Heteroptera: Gerromorpha: Veliidae) from Mesoamerica, with an identification key to the genus.

Oiovelia johnpolhemi sp. nov. is described and illustrated based on macropterous specimens collected in Mexico and Belize.

A new species of Rhagovelia Mayr, 1865 (Hemiptera: Heteroptera: Veliidae) from Brazil.

Rhagovelia kararao sp. nov., collected in sandstone caves from northern Brazil, is described and compared with similar and related species.

New species and notes on Microveliinae from northern South America (Hemiptera: Heteroptera: Veliidae).

Euvelia mazzucconiae sp. nov., from northern Colombia is described, illustrated, and included in an updated identification key to the species of the genus.

A new species of Cylindrostethus Mayr (Hemiptera, Gerromorpha, Gerridae) for the Neotropical Region, with an identification key for the species of Group 1 sensu Drake 1952.

A new species of Cylindrostethus Mayr, C. meloi sp. nov.