347 research outputs found
Chrysis baldocki Rosa & Aswathi & Bijoy 2021, sp. nov.
No full textChrysis baldocki Rosa, sp. nov. (Figs 20 A–20F, 21A–21F) Material examined. Holotype: ♀; India: Tamil Nadu: Coimbatore, 12.x.1955, leg. Nathan, GBIF_ Chr 00043090, spec.? ♂ ♀ Abd [Abdomen] Pkt [Punctation] fein [fine] Coll. Linsenmaier, ex synoptic collection (MNLU). Para- types: 1 ♂: Coimbatore, 1.vii.1954, leg. Nathan, GBIF_ Chr 00043089, spec.? ♂ ♀ Abd [Abdomen] Pkt [Puncta- tion] fein [fine] Coll. Linsenmaier, ex synoptic collection (MNLU); 1 ♂, Tamil Nadu: 60 km SW Madurai, 200m, 09°21,6’N, 77°26,6’E, 6.v.2005, leg. M. Halada (MHC). Diagnosis. Species with body metallic light blue with green reflections. Tergum I with large punctures widely separated, with interspaces densely punctate by small punctures (Fig. 20A); transverse frontal carina well developed and raised, appearing as double (Fig. 20C). Pit row on metasomal tergum III with small and longitudinally elongate pits in ♀ (Fig. 20D). Metasomal sternum II with large black spots (Fig. 20F). Description. Female. Body length 8.5 mm. Forewing length 5.5 mm. OOL 2.3 × MOD; POL 1.7 × MOD; MS 1.2 × MOD; relative length of P:F1:F2:F3 = 1.0:1.5:1.0:0.9. Head. Vertex and frons with small (about 0.3 × MOD) and contiguous punctures, without polished interspaces; punctures smaller on ocelli triangle; without polished areas laterally to posterior ocelli; with larger punctures between ocelli triangle and occipital area; transverse frontal carina strong and somewhat arcuate (Fig. 20C), with lateral endings close to eye margin; scapal basin transversally micropunctate, with punctures somehow aligned; frons declivity and scapal basin medially impunctate; subantennal space less than 1.0 × MOD; apical margin of clypeus almost straight; genal carina fully developed to mandibular insertion. Mesosoma. Medial pronotal line [= pronotal groove] shallow, as long as ¾ length of pronotum; pronotum with larger punctures (0.5 × MOD), with scattered tiny dots on interspaces; mesoscutum with slightly larger punctures, increasing mesad; notauli as line of large and round foveae, black coloured, and larger at base; lateral areas of mesoscutum with scattered punctures, with double punctation and tiny dots on interspaces; parapsidal signum [= parapsidal line] hardly visible; mesoscutellum with large punctures, contiguous at base; metanotum with large, foveate punctures without interspaces; metapectal-propodeal disc with metapostnotal-propodeal suture strong and raised; posterior propodeal projections [= propodeal teeth] subparallel, posteriorly concave; mesopleuron with posterior oblique sulcus of the mesopleuron [= scrobal sulcus], formed by large, irregular foveate punctures; with tiny punctures and corrugation on interspaces; with oblique wrinkles on anterior margin, anteriorly to subalar impression. Tarsomere I of mesoleg as long as II–IV together. Forewing with second radial cell (the marginal cell located apical to the pterostigma) slightly open because radial sector vein (Second radial cross & Radial sector) does not reach wing margin. Metasoma. Tergum I with double punctation, larger punctures broadly separated with dense, small punctures on interspaces; laterally with double punctation, but interspaces among large punctures are narrow; apical margin of the tergum polished and impunctate; tergum II dorsally with even punctation, with medium-sized punctures, becoming double at sides; along median longitudinal line polished, with tiny dots; tergum III densely punctate, with double punctures of small and medium size; pits of pit row small and longitudinally elongate (Figs 20D, 20E); tergum III transversally gibbous before pit row apical margin with four short, triangular median teeth and lateral angle (Figs 20D, 20E). Metasomal terga without distinct median longitudinal carina. Black spots on sternum II large, medially fused and connected to lateroterga (Fig. 20F). Colouration. Body entirely metallic light blue with green reflections all over body, on face, on bottom of mesosomal punctures, on lateral sides, on legs and sterna. Scape, pedicel and flagellomere I light blue, other flagellomeres black. Wings fuscous, with brownish veins. Vestiture. Body with short and whitish setae. Male. Similar to female. The following dimorphic features are observed: apical margin of tergum III straight and pits of pit row larger and partly confluent, anyway smaller than other species of the group; post pit row shorter; median longitudinal carina on terga II and III more visible. Body colour darker blue. Distribution. India (Oriental part: Tamil Nadu). Etymology. The specific epithet baldocki (masculine noun in genitive) is dedicated to the late David W. Baldock (Surrey, UK), who friendly supported the first author works on Chrysididae, providing materials and expertise. Remarks. Chrysis baldocki sp. nov. belongs to the Ch. smaragdula species group. Twenty species of the group are known for India and the Oriental region: Chrysis apricata Bohart in Kimsey & Bohart, 1991; Ch. arachne Mocsáry 1913; Ch. arrestans Nurse, 1903b; Ch. baliana Mocsáry, 1913; Ch. bhoutanensis (du Buysson, 1908); Ch. buddhae Mocsáry, 1913; Ch. ceylonica Mocsáry, 1913; Ch. comotti Gribodo 1884; Ch. decemdentata Linsenmaier, 1959; Ch. durbar Bingham, 1903; Ch. igniceps Mocsáry, 1893; Ch. laglaizei du Buysson, 1898b; Ch. lamellata Mocsáry, 1914; Ch. musa Semenov-Tian-Shanskij in Semenov-Tian-Shanskij & Nikol’skaya, 1954; Ch. parallela Brullé, 1846; Ch. principalis Smith, 1874; Ch. rani Mocsáry, 1913; Ch. schioedtei Dahlbom, 1854; Ch. takasago Tsuneki, 1963; Ch. vicaria Mocsáry, 1913 (Kimsey & Bohart 1991). Whereas other two species included in the smaragdula group by Kimsey & Bohart (1991), are considered here members of the oculata group: Chrysis thakur Mocsáry, 1913, and Ch. obscura Smith, 1860. However, more species were described from the Oriental Region, and synonymised by Kimsey & Bohart (1991); a double check of these taxa is needed to confirm these synonymies. Indian and Oriental species of the smaragdula group can be separated from Chrysis baldocki sp. nov. by the following characters: narrow black spots on the sternum II (Ch. baliana, Ch. buddhae, Ch. ceylonica, Ch. comotti, Ch. durga, Ch. schioedtei); larger black spots on the sternum II (Ch. arachne); deep and large pits of the pit row on the tergum III, almost confluent (Ch. bhoutanensis, Ch. rani, Ch. principalis, Ch. takasago, Ch. vicaria); pits of the pit row very small, almost indistinct (Ch. musa Semenov-Tian-Shanskij in Semenov-Tian-Shanskij & Nikol’skaya, 1954); metascutellum posteriorly lamellate and projecting over metapectal-propodeal disc (Ch. decemdentata and Ch. lamellata); different colouration Ch. comottii sensu auct. (mesonotum olive coloured) and Ch. igniceps (red head)); metasomal punctation (Ch. parallela with large and deep punctures on tergum I, scattered and shallow punctures dorsally on terga II and III). Among the Oriental species, only Chrysis laglaizei du Buysson, from Indonesia, shares a similar shape of black spots of sternum II and small pits of the pit row. Nevertheless, pits are rounded and not longitudinally elongate, the post pit row area is shorter and the metasomal punctation is different, unmodified on the tergum I, with even punctation, not densely micropunctate between larger punctures; lastly, the transverse frontal carina, seen in dorsal view is distinctly raised and bilobed.Published as part of Rosa, Paolo, Aswathi, Pokkattu Gopi & Bijoy, Chenthamarakshan, 2021, An annotated and illustrated checklist of the Indian cuckoo wasps (Hymenoptera: Chrysididae), pp. 1-100 in Zootaxa 4929 (1) on pages 27-28, DOI: 10.11646/zootaxa.4929.1.1, http://zenodo.org/record/454455
From PeV to TeV: Astrophysical Neutrinos with Contained Vertices in 10 years of IceCube Data
No full textThe IceCube Neutrino Observatory is a cubic-kilometer Cherenkov detector at
the South Pole, designed to study neutrinos of astrophysical origin. We present
an analysis of the Medium Energy Starting Events (MESE) sample, a veto-based
event selection that selects neutrinos and efficiently rejects a background of
cosmic ray-induced muons This is an extension of the High Energy Starting Event
(HESE) analysis, which established the existence of high-energy neutrinos of
astrophysical origin. The HESE sample is consistent with a single power law
spectrum with best-fit index , which is softer than
complementary IceCube measurements of the astrophysical neutrino spectrum.
While HESE is sensitive to neutrinos above 60 TeV, MESE improves the
sensitivity to lower energies, down to 1 TeV. In this analysis we use an
improved understanding of atmospheric backgrounds in the astrophysical neutrino
sample via more accurate modeling of the detector self-veto. A previous
measurement with a 2-year MESE dataset had indicated the presence of a possible
30 TeV excess. With 10 years of data, we have a larger sample size to
investigate this excess. We will use this event selection to measure the cosmic
neutrino energy spectrum over a wide energy range. The flavor ratio of
astrophysical neutrinos will also be discussed.Comment: Presented at the 38th International Cosmic Ray Conference (ICRC2023).
See arXiv:2307.13047 for all IceCube contribution
Frequency-optimised radio arrays for air-showerdetection
No full textInternational audienceThe radio detection technique has successfully been applied to the measurement of cosmic-ray induced air showers with energies above 10^16 eV. A majority of these measurements are performed in the frequency band of 30-80 MHz, by the existing radio air-shower experiments. Recent results of a simulation study with CoREAS show that the optimisation of the frequency band improves the signal-to-noise ratio. This in turn lowers the energy threshold of detection by an order of magnitude. This talk will focus on the universal application of such a frequency optimisation for all future radio air-shower arrays, which will improve the performance of these future arrays. For this, a simulation study performed for the locations of IceTop, GRAND and the Pierre Auger Observatory using air showers generated by cosmic rays, gamma-rays and neutrinos is utilised
Searches for IceCube Neutrinos Coincident with Gravitational Wave Events
No full textSearches for neutrinos from gravitational wave events have been performed
utilizing the wide energy range of the IceCube Neutrino Observatory. We discuss
results from these searches during the third observing run (O3) of the advanced
LIGO and Virgo detectors, including a low-latency follow-up of public candidate
alert events in O3, an archival search on high-energy track data, and a
low-energy search employing IceCube-DeepCore. The dataset of high-energy tracks
is mainly sensitive to muon neutrinos, while the low energy dataset is
sensitive to neutrinos of all flavors. In all of these searches, we present
upper limits on the neutrino flux and isotropic equivalent energy emitted in
neutrinos. We also discuss future plans for additional searches, including
extending the low-latency follow-up to the next observing run of the
LIGO-Virgo-KAGRA detectors (O4) and analysis of gravitational wave (GW) events
using a high-energy cascade dataset, which are produced by electron neutrino
charged-current interactions and neutral-current interactions from neutrinos of
all flavors.Comment: Presented at the 38th International Cosmic Ray Conference (ICRC2023).
See arXiv:2307.13047 for all IceCube contribution
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