1,721,295 research outputs found
Risks of massive tree planting in Europe should be considered by the EU Forestry Strategy 2030
No full textThe EU Forestry Strategy 2030 includes an ambitious reforestation/afforestation plan aimed at planting 3 billion trees that
should lead the European Union toward carbon neutrality by 2050. We argue that important ecological aspects were not sufficiently
considered in the Strategy. The consequences of large-scale afforestation plans on biodiversity-rich open areas were
poorly considered. “Where to plant” is a key aspect, as one of the targets for planting trees may be biodiversity-rich open areas,
that are already declining due to natural shrub and tree encroachment. We suggested that urban areas and areas near linear
infrastructures should be themain targets of afforestation. Concerning “What to plant” non-native species should be avoided in
all cases. Among native species, certain geno-ecotypes may not equally perform under the effects of climate change. We therefore
suggest a throughout revision of the EU Forestry Strategy 2030 with the inclusion of ecologically driven principles
A new Neotropical ant species of genus Linepithema Mayr (Hymenoptera, Formicidae, Dolichoderinae) with partial revision of the L. fuscum group based on males
No full text: The genus Linepithema was erected by Mayr (1866) for his male-based species L.fuscum. In this study a new species is described also based on male morphology, L.paulistanasp. nov., collected in the city of São Paulo, Brazil, which is attributed to the fuscum group (Formicidae: Dolichoderinae). Linepithemapaulistanasp. nov. is the only species of fuscum group present in the eastern part of South America. It is easily distinguishable from the other species of the group because of the presence of a triangular volsellar tooth, which is distally situated between the digitus and the basivolsellar process. By using SEM and optical microscopy, the external genitalia of L.paulistanasp. nov. were analyzed and illustrated and some characters and previous interpretations have been re-evaluated in the Linepithemafuscum group. The male external genitalia are also comparatively analyzed in three species representative of the three Linepithema species groups, those of fuscum, humile, and neotropicum. The present work confirms that the morphological characters of male ants, especially those of male external genitalia, are effective for the identification of genera or species. Given the discrete morphological differences between the external genitalia of the fuscum group and the other species of this genus, a re-evaluation of the generic status of Linepithema is suggested
Studi morfologici e tassonomici sui maschi di formiche italiane (Hymenoptera, Formicidae
No full textLe formiche sono insetti eusociali che formano colonie composte da individui con funzioni e morfologie diverse chiamate caste: queste includono femmine fertili, femmine sterili e maschi. La storia tassonomica della famiglia Formicidae ha ampiamente trascurato la casta maschile, dalla vita breve ed elusiva, mentre le diagnosi di generi e specie si basano principalmente sulla più diffusa casta sterile delle operaie, spesso polimorfica, causando incertezze ed errori nella delimitazione e identificazione delle specie. Come in altri insetti, invece, l'anatomia dei genitali esterni maschili di formiche presenta caratteristiche specie-specifiche stabili, fondamentali per una corretta identificazione. L’attività di ricerca da noi intrapresa nell’ambito dell’Activity 1 (NBFC) dello Spoke 3 (PNRR) si sta occupando di dare un contributo sostanziale alla conoscenza della morfologia e tassonomia dei maschi alati di specie di formiche italiane, utilizzando microscopia ottica ed elettronica a scansione (SEM)
Analisi Microscopica delle Areniti Terrigene: parametri petrografici e composizioni modali
No full textA Fine Morphological Study of the Rare Anillidris bruchi Santschi (Hymenoptera: Formicidae: Dolichoderinae) Male and Queen
No full textSimple Summary: In this study, based on specimens collected in the city of Sao Paulo (Brazil), we redescribe and illustrate the rare Neotropical ant Anillidris bruchi male and queen by using optical and scanning electron microscopy (SEM), supplying new morphological distinctive characters, and improving the previous descriptions. This work will be useful for identifying the alate castes of this species and for using the characters of the male and queen to infer relationships with other dolichoderine ants. Using optical and scanning electron microscopy, we describe the following new morphologically distinctive characters of the rare Neotropical ant Anillidris bruchi Santschi, 1936, male and queen: scattered setae inter-ommatidia, semicircular hypostomal notch, antennal cleaning, metatibial spurs, and the remnant of the M2 vein in the hindwings. In males, we show for the first time the morphology of maxillary and labial palpi, the absence of metapleural glands, and, in external genitalia, for the first time in ants, a new mechano-sensory area on the volsella that we called "volsella sensorium", composed of several spine-like sensilla. Additionally, we give an updated morphological diagnosis of the alate caste, which will be useful for future studies to clarify the phylogeny of the genus Anillidris
Deep-water Rissoidae of the genera Benthonella Dall, 1889 and Benthonellania Lozouet, 1990 (Gastropoda, Caenogastropoda, Rissooidea) from French Polynesia
No full textShallow-water Rissoidae of the genera Alvania Risso, 1826, HaurakiaIredale, 1915, Parashiela Laseron, 1956, Simulamerelina Ponder, 1985 and Subestea Cotton, 1944 (Gastropoda, Caenogastropoda,Rissooidea) from French Polynesia, with the description of a new deep-water genus
No full textThe extant species of the genera Alvania Risso, 1826, Haurakia Iredale, 1915, Parashiela Laseron, 1956, Simulamerelina Ponder, 1985 and Subestea Cotton, 1944 (Rissoidae Gray, 1847) collected in the shallow waters of French Polynesia are herein revised, for a total of 19 species. Additionally, a new genus for a new deep-water species is here introduced. Two species with wide range in the Pacific are reported: Haurakia marmorata (Hedley, 1907) and Parashiela ambulata Laseron, 1956. Five species of Alvania, one of Ellenstrongia n. gen., five of Parashiela, six of Simulamerelina and one Subestea are described as new: Alvania letourneuxi n. sp., Alvania herosae n. sp., Alvania parvimaculata n. sp., Alvania prosocostata n. sp., Alvania uapou n. sp., Ellenstrongia tarasoc n. gen., n. sp., Parash- iela expansilabrum n. sp., Parashiela obesula n. sp., Parashiela rimatara n. sp., Parashiela rotundata n. sp., Parashiela soniae n. sp., Simulamerelina australes n. sp., Simulamerelina densestriata n. sp., Simulamerelina gracilis n. sp., Simulamerelina lepteseiras n. sp., Simulamerelina micrometrica n. sp., Simulamerelina tuamotu n. sp., Subestea moruroa n. sp. Three taxa are transferred to Alvania: Rissoa denseclathrata Thiele, 1925, Rissoa lusoria Yokoyama, 1926, Rissoa proditoris Thiele, 1925. Twelve species have a non-planktotrophic development; five of them are endemic to a single archipelago: Alvania letourneuxi n. sp., Simulamerelina gracilis n. sp., Simulamerelina tuamotu n. sp. to Tuamotu, Simulamerelina densestriata n. sp. to Australes, Parashiela soniae n. sp. to Marquesas. Of the eight spe- cies with planktotrophic development, two are apparently endemic to a single archipelago: Parashiela obesula n. sp. and Parashiela rimatara n. sp. to Australes
Fine Morphological Study of the Myrmecina graminicola (Latreille, 1802) Male, With First Description of External Genitalia in the Genus (Hymenoptera: Formicidae: Myrmecinae)
Full text linkTe genus Myrmecina was described basing on males of M. graminicola. Tough representing the caste type, males were sufciently described in only two out of 105 species known in the genus. However, the morphology of the male external genitalia remained undescribed. Re-examining by SEM the male of M. graminicola, we describe and illustrate in detail for the frst time the external genitalia, redefning and updating the morphological male diagnosis of the genus. We also analyze the overall mor- phology, illustrating additional peculiar characters of this species as follows: (i) a very distinctive stipital groove in the dorsolateral stipes; (ii) a developed uncinate-shaped mesoscutellar arm; (iii) the antennal cleaning; and (iv) the absence of meso- and metatibial spurs. Tis morphological study will be useful as a base for further morphological descriptions of the males in other species of the same genus to support correct taxonomic identifcation
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