New species, new combinations, and morphological notes of South American Ambrysinae (Heteroptera: Naucoridae).

Although recent studies have been published on Ambrysinae (Naucoridae) from the Neotropical region, few efforts have been made to improve the taxonomic knowledge of this subfamily in Brazil. Two genera of Ambrysinae containing the greatest number of species in South America were recently established to accommodate species previously classified as Ambrysus Stål: Australambrysus Reynoso & Sites and Maculambrysus Reynoso & Sites. The subgeneric classification of Ambrysus has also changed, including the elevation of Melloiella De Carlo back to full generic status.

A new species of Maculambrysus Reynoso & Sites, 2021 (Hemiptera: Heteroptera: Naucoridae) from an aguaje palm swamp in southeastern Peru.

The neotropical saucer bug genus Maculambrysus Reynoso & Sites is currently represented by five species from Tabasco, Mxico to Par, Brazil. Presented here is the description of a sixth species, Maculambrysus gallicei n.sp.

Revision of Limnocoris Stål (Heteroptera: Nepomorpha: Naucoridae) of the Guiana Shield and Amazon regions.

The species of Limnocoris of the Guiana Shield and Amazon regions of South America are revised, including the descriptions of five new species: L. amazonensis n. sp.

Revision of the Ambrysus signoreti Stål species complex (Heteroptera: Naucoridae: Ambrysinae). Section 2.

The Ambrysus signoreti Stål species complex was recently diagnosed and subdivided into three sections based on morphology of the female subgenital plate. In the present study, the species in the second section, characterized by the posterior margin of the subgenital plate with central lobe extending posteriorly further than the posterolateral corners, are revised. Supplemental descriptions for four species described by La Rivers and Usinger are provided.

The Australambrysus plax (La Rivers, 1967) species complex (Heteroptera: Naucoridae), with descriptions of three new species.

The taxonomy of the neotropical saucer bug genus Australambrysus Reynoso & Sites, 2021 is poorly understood. Although 24 species have been described, the genus is in need of revision and many new species await description. A clade of species of Australambrysus exhibits a similar appression of the propleura to the prosternum as do species of the North American Ambrysus Stål, 1862 subgenus Syncollus La Rivers, 1965.

Notes on the morphology of two species of Limnocoris Stål (Heteroptera: Naucoridae) from South America.

In the present study, new distribution records and notes on the wing polymorphism of Limnocoris pallescens (Stål, 1861), a species distributed in Colombia and Venezuela, are presented. Also, after the discovery of two female paralectotypes of L. pectoralis Montandon, 1897 deposited at the Natural History Museum in London, ongoing uncertainty about the shape of the diagnostic mediosternite VII (subgenital plate) of this species has been resolved.

Nomenclatural updates to the taxonomy of Naucoridae (Hemiptera: Heteroptera).

N/A.

The Naucoridae (Heteroptera: Nepomorpha) of Madagascar, with revisions of Temnocoris and Tsingala (Laccocorinae).

The island nation of Madagascar was surveyed extensively through a series of expeditions to determine the fauna of Naucoridae. Previously, 17 species in four genera had been reported from the country. All taxa previously recorded from Madagascar were re-collected, with the exception of three species, Macrocoris flavicollis Signoret, Temnocoris starmuhlneri Poisson, and Tsingala nossibeanus (Bergroth).

The Gyrinidae (Coleoptera) fauna of Thailand: Key to tribes and genera, with new records and keys to species of Dineutini and Gyrinini.

Eighteen species and four genera of the family Gyrinidae are recorded from Thailand. Seven species, belonging to three genera in the tribes Dineutini and Gyrinini, are here treated in detail. Dineutus sitesi Gustafson, Hjek Miller, D.

Review of the Patrus landaisi species group from Thailand with description of three new species (Coleoptera, Gyrinidae).

A survey of the whirligig beetles of the genus Patrus Aubé, 1838 occurring in Thailand belonging to the newly designated Patrus landaisi species group is presented. Three new species are described and illustrated: P. garuda sp.

Revision of Limnocoris Stål (Heteroptera: Nepomorpha: Naucoridae) of the tropical Andes.

The species of Limnocoris of the tropical Andes of South America are revised, including the descriptions of eight new species: L. chrysosetosus n. sp.

A review of emCryphocricos/em Signoret, 1850 (Naucoridae: Cryphocricinae) with descriptions of three new species.

The genus Cryphocricos Signoret, 1850 was recently determined in a molecular phylogeny to be distantly related to other taxa of the subfamily Cryphocricinae to the extent that it is now once again the sole member of the subfamily. This exclusively New World group of aquatic bugs lives in fast and usually turbulent current and respires by means of a plastron. Efforts to identify morphological features to distinguish among the species have largely fallen short, and some species have been established based on features that exhibit a high degree of intraspecific variation overlapping those of other species.

The Pleidae (Hemiptera, Heteroptera) of Thailand, with the descriptions of two new species and a discussion of species from Southeast Asia.

The family Pleidae is represented in Thailand by four species in the genus . Two of these species, and , are widespread and relatively common in Southeast Asia. Two other species, Cook, and Cook, , are described and only known from Thailand.

Revision of the Ambrysus hybridus Montandon species complex (Heteroptera: Naucoridae: Cryphocricinae) with the description of a new species from Mexico.

The Ambrysus hybridus Montandon species complex is revised and includes A. convexus Usinger, A. fuscus Usinger stat.

Revision of the Ambrysus guttatipennis Stål species complex (Heteroptera: Naucoridae: Cryphocricinae) with the descriptions of six new species from Mexico.

The Ambrysus guttatipennis Stål species complex is revised and includes A. arizonus La Rivers, A. bispinus La Rivers, A.

Revision of the Neotropical genus Carvalhoiella De Carlo (Heteroptera: Nepomorpha: Naucoridae).

The genus Carvalhoiella De Carlo, 1963 includes saucer bugs (Heteroptera: Naucoridae) that live predominantly on the vertical rocks next to falls and cascades of waterfalls. Thus far, it has been recorded only in South America and includes three described species. In the present paper, based on type specimens and additional material, we present detailed distributions and diagnostic information of the three described species of Carvalhoiella and the descriptions of two new species from central-western Brazil: C.

The Ambrysus Stål (Heteroptera: Naucoridae: Cryphocricinae) of Mexico: Revision of the subgenus Syncollus La Rivers.

The subgenus Ambrysus (Syncollus) La Rivers is mostly Neotropical and includes nine described species. Features uniting species in this subgenus are related to the position of the propleura with respect to the prosternum in males and females, as well as characteristics of tergum V and the genitalia of males. Three species of Syncollus are known from Mexico including Ambrysus baeus Polhemus & Polhemus, A.

New taxa of Cryphocricinae (Heteroptera: Naucoridae) from the Guiana Shield: Hygropetrocoris Sites, n. gen. and two new species of Ambrysus Stål.

A new genus and species of Naucoridae are described from two male specimens that inhabited an algae-covered granite rock seep in Guyana. Hygropetrocoris Sites NEW GENUS is diagnosed by a nearly vertical and apparently freely movable head, bulbous eyes, hair lines and hair patches on the hemelytra, profemur with anterior excavation that can receive a prominent tooth on the opposable protibia, and stout marginal tufts of setae on the pronotum, embolium, and connexiva. H.

Review of the Ambrysus stali La Rivers species complex (Heteroptera: Nepomorpha: Naucoridae) with the description of a new species from Mesoamerica.

The Neotropical Ambrysus stali La Rivers species complex is reviewed and includes A. bifidus La Rivers & Nieser, A. scolius La Rivers, A.

A new species, new synonymy, and notes on Neomacrocoris (Heteroptera: Nepomorpha: Naucoridae).

Based on borrowed museum specimens and fresh collections from South Africa, Tanzania, and Uganda, many specimens of Neomacrocoris Montandon have been made available for study. Neomacrocoris liberianus n. sp.

Pelocoris balius La Rivers (Hemiptera: Heteroptera: Naucoridae) in Florida: New Status of an Enigmatic Saucer Bug.

The saucer bug subspecies Pelocoris femoratus balius La Rivers was described from east-central Florida and differs from the nominate subspecies by pronounced dark spotting on the fore femora, head, and pronotum. This subspecies is much less commonly encountered than is P. f.

New province record of Rhinagrion for Thailand and description of the larva of R. mima (Odonata: Zygoptera: Philosinidae).

The Oriental damselfly genus Rhinagrion includes 10 known species, but the larva of only R. philippinum has been described in any detail, while the larva of R. viridatum has been well-illustrated and features summarized.

Key to the species of Eotrechinae (Hemiptera: Heteroptera: Gerridae) of Thailand and review of the fauna of the Phetchabun Mountain Range.

Water striders of the subfamily Eotrechinae from the Phetchabun Mountain Range can be found at the margins of rock pools and puddles, and in hygropetric habitats including waterfalls. Twenty-two species in three genera are known from Thailand. In the Phetchabun Mountain Range, 12 species representing all three genera were recorded from over a decade of collections (2002-2012).

Neotropical genera of Naucoridae (Hemiptera: Heteroptera: Nepomorpha): new species of Placomerus and Procryphocricos from Guyana and Venezuela.

The Neotropical fauna of saucer bugs (Naucoridae) currently includes four monotypic genera. Recent extensive collecting in Venezuela has produced three new species in two of these genera. In addition, undetermined Guyanan specimens of one of the new species were found in the United States National Museum of Natural History.

Least-desired index for assessing the effectiveness of grass riparian filter strips in improving water quality in an agricultural region.

Unprotected streams within the agricultural Midwest region of the United States are subject to sedimentation, nutrification, and agricultural chemicals. Grass riparian filter strips (GRFSs) have been implemented as a best management practice to minimize sedimentation and associated materials that are harmful to aquatic ecosystems; however, few studies have examined the benthic community response to GRFS installation. This study introduces a least-desired index (LDI) multimetric approach of evaluating benthic communities in response to GRFS installation.