RESUMO
Recent study of the water scavenger beetle subfamily Acidocerinae in the Neotropical region has uncovered numerous undescribed species that are not able to be placed in existing genera. Here, we describe three new genera to accommodate 17 of these new species from South America: Aulonochares gen. nov. for Aulonochareslingulatus sp. nov. (French Guiana, Suriname), Aulonocharesnovoairensis sp. nov. (Brazil), and Aulonocharestubulus sp. nov. (Brazil, Guyana, Suriname, Venezuela); Ephydrolithus gen. nov. for Ephydrolithushamadae sp. nov. (Brazil), Ephydrolithusminor sp. nov. (Brazil), Ephydrolithusogmos sp. nov. (Brazil), Ephydrolithusspiculatus sp. nov. (Brazil), and Ephydrolithusteli sp. nov. (Brazil); and Primocerus gen. nov. for Primoceruscuspidis sp. nov. (Venezuela), Primocerusgigas sp. nov. (Venezuela), Primocerusneutrum sp. nov. (Guyana, Suriname, Venezuela), Primocerusocellatus sp. nov. (Venezuela), Primoceruspetilus sp. nov. (Brazil), Primoceruspijiguaense sp. nov. (Venezuela), Primocerusmaipure sp. nov. (Venezuela), Primocerussemipubescens sp. nov. (Guyana), and Primocerusstriatolatus sp. nov. (Suriname). The genus Ephydrolithus gen. nov. is currently known to be restricted to seepages in the mountainous regions of the Brazilian Shield. Aulonochares gen. nov. and Primocerus gen. nov. are both currently only known from the Guiana Shield, though widespread in that region where they are associated with streams and seeps. We present differential diagnoses, maps, habitat details, and illustrations of all new genera and species here described.
ResumenEl estudio reciente de escarabajos acuáticos de la subfamilia Acidocerinae en la región neotropical, ha revelado numerosas especies no descritas que no pueden ser atribuidas a los géneros existentes. Aquí describimos tres géneros nuevos para acomodar 17 de estas especies nuevas de Suramérica: Aulonochares gen. nov. para Aulonochareslingulatus sp. nov. (Guyana Francesa, Surinam), Aulonocharesnovoairensis sp. nov. (Brasil), y Aulonocharestubulus sp. nov. (Brasil, Guyana, Surinam, Venezuela); Ephydrolithus gen. nov. para Ephydrolithushamadae sp. nov. (Brasil), Ephydrolithusminor sp. nov. (Brasil), Ephydrolithusogmos sp. nov. (Brasil), Ephydrolithusspiculatus sp. nov. (Brasil), y Ephydrolithusteli sp. nov. (Brasil); y Primocerus gen. nov. para Primoceruscuspidis sp. nov. (Venezuela), Primocerusgigas sp. nov. (Venezuela), Primocerusneutrum sp. nov. (Guyana, Surinam, Venezuela), Primocerusocellatus sp. nov. (Venezuela), Primoceruspetilus sp. nov. (Brazil), Primoceruspijiguaense sp. nov. (Venezuela), Primocerusmaipure sp. nov. (Venezuela), Primocerussemipubescens sp. nov. (Guyana), y Primocerusstriatolatus sp. nov. (Surinam). El género Ephydrolithus gen. nov. se restringe hasta ahora a hábitats higropétricos en las regiones montañosas del Escudo Brasileño. Aulonochares gen. nov. y Primocerus gen. nov. son ambos hasta ahora conocidos del Escudo Guyanés, no obstante, ampliamente distribuidos en esa región en la que están asociados con corrientes y hábitats higropétricos. Presentamos diagnosis diferenciales, mapas, detalles sobre los hábitats e ilustraciones para todos los géneros y especies que aquí se describen.
RESUMO
Yara marmontsedu, a new species in the family Hydroscaphidae (Coleoptera: Myxophaga), is described and illustrated. Specimens of Y. marmontsedu were collected at the Pijibay Creek, tributary of the Mico River in Chontales, Nicaragua. The immature stages are described and illustrated for the first time for a species of Yara. This is a contribution to the knowledge of the water beetle fauna of Nicaragua.
Assuntos
Besouros , Larva , Animais , Nicarágua , RiosRESUMO
We here describe and illustrate six new species of the genus Lachnopus, the most taxonomically chaotic group of entimines in the Caribbean region. These species are Lachnopus cozumelus Girón O'Brien, sp. nov. from Cozumel Island, Mexico, Lachnopus karphos Girón O'Brien, sp. nov. from Mayaguana Island in the Bahamas, Lachnopus lucayanus Girón O'Brien, sp. nov. from Eleuthera in the Bahamas and Providenciales in the Turks and Caicos Islands, Lachnopus petilusquamus Girón O'Brien, sp. nov. from Eleuthera in the Bahamas, Lachnopus rhabdotus Girón O'Brien, sp. nov. from Providenciales in the Turks and Caicos Islands and Lachnopus vanessablockae Girón O'Brien, sp. nov. from the Cayman Islands. These constitute the first species of the genus described for each island group, and expand the geographical range of the genus, by including the Lucayan Archipelago, the Cayman Islands and Cozumel Island. Individuals of L. vanessablockae have been collected on the Cayman endemic banana orchid (Myrmecophila thomsoniana (Orchidaceae)), which represents the first reported occurrence of Lachnopus weevils as pollinators. In addition, we present an annotated checklist of the species of Lachnopus, including collecting localities, host plants, and biological notes obtained from the literature or collection data from labels of collections' specimens. Lachnopus coffeae Marshall, 1922 is recorded for the first time for Grand Bahama, which appears to be an introduction associated with citrus from Puerto Rico. We also list the fossil species attributed to the genus. Comments on some morphological characters and their variation across the genus are included. Species-groups within the genus are proposed, including diagnostic features to recognize them. Some taxonomic conflicts found in collections are pointed out. This paper compiles fundamental information, and assembles a framework for future revisionary work on Lachnopus.
Assuntos
Besouros , Gorgulhos , Animais , Bahamas , Ilhas , México , Porto Rico , Índias OcidentaisRESUMO
New World species assigned to the Helochares subgenus Hydrobaticus MacLeay are reviewed based on adult morphology and DNA sequence data. Nine species are recognized, including five here described as new: Helochares (Hydrobaticus) laevis n. sp. (Mexico), H. (Hydrobaticus) nexus n. sp. (Ecuador, Panama, Venezuela), H. (Hydrobaticus) politus n. sp. (Guatemala), H. (Hydrobaticus) trujillo n. sp. (Venezuela), and H. (Hydrobaticus) zamora n. sp. (Ecuador). New records are provided for the three previously described species: Helochares (Hydrobaticus) championi Sharp, 1882 (Costa Rica, Guatemala, Nicaragua), H. (Hydrobaticus) maculicollis Mulsant, 1844 (United States), and H. (Hydrobaticus) normatus (LeConte, 1861) (United States to Costa Rica). A ninth species, known only from five poorly preserved female specimens from Peru, is left undescribed until additional material can be found. Most species are known to exhibit some parental care, with the egg case being attached to the abdomen of and carried by the female. Intraspecific genetic distances within several species are very high, in some cases more than 8% in the mitochondrial gene COI, suggesting there may be additional cryptic species remaining to be identified. All taxa are illustrated and a key to species is provided.
Assuntos
Besouros , Animais , Costa Rica , Equador , Feminino , Guatemala , México , Nicarágua , Panamá , Peru , VenezuelaRESUMO
The Neotropical water scavenger beetle genus Globulosis García, 2001 is revised. Originally described from a single male specimen from southeastern Venezuela, the genus has since been found in localities across the Guiana Shield region and beyond, including Colombia, Suriname, Guyana, and Brazil. The genus is redescribed. Morphological characters and genetic data from the mitochondrial gene COI from ten populations across its range provide support for two distinct species, corresponding loosely to geography. The type species, G. hemisphericus García, is redescribed and newly recorded from Guyana, Suriname, and Brazil (Amazonas, Para). One new species is described, Globulosis flavus sp. n. from southwestern Venezuela (Amazonas, Bolivar). The genus is associated with lotic habitats, and typically found along the margins of small to medium sized streams. High-resolution habitus and aedeagal images and distribution maps for all species are provided.
Assuntos
Besouros , Animais , Brasil , Guiana , Masculino , Suriname , Venezuela , ÁguaRESUMO
Scelianoma elydimorpha Franz & Girón, new genus and new species, an entimine weevil endemic to southwestern Puerto Rico, is described and illustrated in detail, and assigned to the tribe Eustylini (Curculionidae: Entiminae). Scelianoma is distinguished from related taxa by the following diagnostic features: shape narrowly elongate, length/width ratio 2.8-3.5; integument with densely arranged scales; pronotum without conspicuous sculpturing; male metatibia with row of 5-7 teeth, each tooth with a spine-like seta; female metatibia lacking teeth, yet with row of long, narrowly depressed setae; metatibial corbel linear; elytral humeri absent, elytra in lateral view with dorsal outline subplane, lacking cuticular projections, posterior declivity strongly angulate, slightly convex (male) to rectate (female); and wings absent. The elytra of S. elydimorpha are sexually dimorphic, attenuating in males along the posterior 5/6 yet mostly subparallel in females, and the females furthermore have two rows of erect setae along each mesal side of the declivity. Scelianoma elydimorpha is common on the southern limestone slopes of the well-preserved Guánica dry forest. The immature stages and host plants are unknown.
Assuntos
Gorgulhos/classificação , Animais , Feminino , Masculino , Porto Rico , Gorgulhos/anatomia & histologiaRESUMO
Scelianoma elydimorpha Franz & Girón, new genus and new species, an entimine weevil endemic to southwestern Puerto Rico, is described and illustrated in detail, and assigned to the tribe Eustylini (Curculionidae: Entiminae). Scelianoma is distinguished from related taxa by the following diagnostic features: shape narrowly elongate, length/width ratio 2.8-3.5; integument with densely arranged scales; pronotum without conspicuous sculpturing; male metatibia with row of 5-7 teeth, each tooth with a spine-like seta; female metatibia lacking teeth, yet with row of long, narrowly depressed setae; metatibial corbel linear; elytral humeri absent, elytra in lateral view with dorsal outline subplane, lacking cuticular projections, posterior declivity strongly angulate, slightly convex (male) to rectate (female); and wings absent. The elytra of S. elydimorpha are sexually dimorphic, attenuating in males along the posterior 5/6 yet mostly subparallel in females, and the females furthermore have two rows of erect setae along each mesal side of the declivity. Scelianoma elydimorpha is common on the southern limestone slopes of the well-preserved Guánica dry forest. The immature stages and host plants are unknown.
Scelianoma elydimorpha Franz & Girón, género nuevo y especie nueva, un picudo entimino endémico al sureste de Puerto Rico, se describe e ilustra en detalle, y se asigna a la tribu Eustylini (Curculionidae: Entiminae). Scelianoma se distingue de taxones relacionados por los siguientes rasgos diagnósticos: forma estrechamente elongada, relación largo-ancho 2.8-3.5; integumento con escamas densamente arregladas; pronoto sin esculturas conspicuas; metatibia del macho con fila de 5-7 dientes, cada diente con una seta espinosa; metatibia de la hembra sin dientes, pero con fila de setas largas y estrechamente deprimidas; corbela de la metatibia linear; hombros elitrales ausentes, élitros en vista lateral con perfil dorsal subplano, sin proyecciones cuticulares, declive elitral fuertemente angulado, ligeramente convexo (macho) hasta recto (hembra); y alas ausentes. Los élitros de S.elydimorpha son sexualmente dimórficos, atenuándose en machos a lo largo de los 5/6 posteriores pero en su mayor parte subparalelos en hembras, y las hembras tienen además dos filas de setas erectas a lo largo de cada lado mésico del declive. Scelianoma elydimorpha es común en las pendientes de piedra caliza del sur del bosque seco y bien preservado de Guánica. Los estadios inmaduros y las plantas hospederas no son conocidos.