145,712 research outputs found
Copidognathus gurui Chatterjee & Pešić 2014, sp. nov.
No full text<i>Copidognathus gurui</i> sp. nov. <p>(Figs. 1­ 4)</p> <p> <b>Material examined.</b> Holotype (female), paratype (female), and additional materials ­ two females used for SEM, Matemwe (05 o 52'S, 39 o 21'E) the east coast of Unguja, Zanzibar, Tanzania in coral rubble of <i>Fungia</i> (Anthozoa, Scleractinia), August 17 th 2004, coll. M Raes & H Gheerardyn.</p> <p> <b>Description</b></p> <p> Female. Idiosoma 295­ 317 (holotype: 317) µm long. AD 104­ 111 (holotype: 106) µm long. Anterior half of AD joining with dorsal part of AE. AD with frontal process and three areolae. Anterior areola oblong; paired crescent shaped middle areolae with 18­ 20 rosette pores each. Paired ds 1 anterior to middle areolae on AD. Pair of gland pores lie near anterolateral margin of AD anterior to ds 1. Area between areolae comperises large sized panels (panels not subdivided). Posterior margin of AD with a ridge containing a row of panels, each panel subdivided comprising four to eight small shallow subpanels. OC 82­ 84 µm long, 51­ 56 µm width, length to width ratio about 1.6, each with two corneae, areolae with rosette pores medial to corneae and posterolateral to posterior cornea; gland pore lateral to posterior cornea adjacent to lateral margin of OC; pore canaliculus present adjacent to lateral margin of OC. Setae ds 2 located at anteromedial corner of OC. PD 173 – 193 (holotype: 193) µm long. PD with two middle and two lateral costae. Each middle costae about 16 µm wide: with one to two rosette pores (each rosette pore with prominent ostium and canaliculi in and around it) and with panels lateral to it (each panel subdivided comprising subpanels) (Figs. 1D, 3E, F). Anterior part of middle costae and lateral costae joined together with panels (each panel with subpanels). Area between two middle costae three to six panels wide, panels not subdivided (devoid of subpanels). Setae ds 3 – ds 5 on PD. Gland pores lateral to middle costae on posterior part of PD. AE with three pairs of ventral setae and a pair of epimeral pores. Paired ventrolateral areolae between insertion of legs I and II, paired marginal areolae posterior to insertion of leg II. PE with three ventral and one dorsal seta. GA 150­ 153 (holotype: 151) µm long, GO 50­ 59 (holotype: 52) µm long. Distance between anterior end of GO and that of GA subequal to GO length. Paragenital areolae well developed. Three pairs of PGS present. In holotype anterior PGS 22 µm anterior to anterior end of GO; middle pair of PGS posterior to anterior margin of GO, 32 µm apart from lateral margin of GA; third pair near posterior side of GO. Pair of SGS located at the anterior end of genital sclerites.</p> <p> Gnathosoma 83 ­ 93 µm long. Palp consisting of four segments. Tip of rostrum just passing distal end of P 3. P 1 and P 3 devoid of any seta. P 2 with one dorsal seta distally. P 4 with three long proximal seta and one minute distal seta. Proto and deutorostral seta situated at the tip of rostrum; tritorostral setae (long maxillary setae of rostrum) located at 0.35 of rostrum length from its tip. Gnathosomal base with a pair of setae (basirostral setae). Rostral sulcus long extends posteriorly just beyond the tritorostral seta.</p> <p>Chaetotaxy of legs: trochanters I­IV, 1­ 1­ 1­ 0; basifemora I­IV, 2­ 2­ 2­ 2; telofemora I­IV, 5­ 5­ 3­ 3; genua I­IV, 4­ 4­ 3­ 3; tibiae I­IV, 7­ 7­ 5­ 5; tarsi I­IV (PAS excluded), 7­ 4­ 4­ 3. Telofemora III­IV with two dorsal setae and one ventral seta. Telofemur I swollen with well developed trilobed ventrolateral lamella. Tibia I with three ventral setae (one long, pointed ventral seta and two thick, smaller ventromedial setae). Tibia II with one long, pointed ventral seta and two thick, pectinate ventromedial setae. Tibia III with one thick, pectinate ventromedial seta. All setae of tibia IV smooth. Tibia I with two denticulate proximoventral processes (lamella) (Fig. 1E). Tibia II with a feebly developed (not clear properly) proximoventral process. Tarsus I with three dorsal setae, one solenidion, three ventral setae and two eupathidial doublet PAS. Tarsus II with three dorsal setae, one solenidion; PAS obscured by specimen compression. Tarsus III with four dorsal setae (distance between two basidorsal setae a little less than height of the segment) and two PAS. Tarsus IV with three dorsal setae and two PAS. All legs with two lateral claws and one bidentate median claw. Lateral claws with accessory process dorsally. Lateral claws of tarsi II­IV with ventral pecten.</p> <p> <b>Etymology.</b> The species is dedicated in honor of Prof. B. C. Guru, Utkal University, Bhubaneswar, Orissa, India, thesis advisor (in D. Sc.) of first author (TC).</p> <p> <b>Remarks.</b> <i>Copidognathus gurui</i> sp. nov. is characterized by two crescent shaped middle areolae on anterior dorsal plate, ds 2 on anteromedian corner of OC, a swollen telofemur I with a trilobed ventrolateral lamella, tibia I with two denticulate proximoventral processes, tarsi III and IV with 4:3 dorsal setae, telofemora III and IV each with one ventral seta.</p> <p> Present new species has some similarity with <i>C. punctatissimus</i> (Gimbel, 1919), <i>C. dentatus</i> Viets, 1940, <i>C. biscayneus</i> Newell, 1947, <i>C. dentipes</i> Bartsch, 1989, <i>C. eblingi</i> Chatterjee, 1991, <i>C. jejuensis</i> Chatterjee & Chang, 2004 and <i>C. mumbaiensis</i> Chatterjee & Chang, 2004. <i>C. tupinamborum</i> Pepato & Tiago, 2005 (Gimbel 1919; Newell 1947; Bartsch 1989; Chatterjee 1991; Chatterjee and Annapurna 2003, Chatterjee and Chang 2004a, b, 2006; Pepato and Tiago 2005).</p> <p> <i>C. punctatissimus</i> has ds 2 located on anteromedial corner of OC as in <i>C. gurui</i> sp. nov. while in all of the other aforementioned species ds 2 are located in the membranous cuticular area between AD and OC. <i>Copidognathus gurui</i> sp. nov. differs from <i>C. punctatissimus</i> and all other species in having a well developed trilobed ventrolateral lamella on telofemur I.</p> <p> <i>Copidognathus mumbaiensis</i> is characterised by the presence of a serrated lamella ventrolaterally on telofemur I instead of trilobed lamella.</p>Published as part of <i>Chatterjee, Tapas & Pešić, Vladimir, 2014, A new species of the genusCopidognathus (Acari, Halacaridae) from Zanzibar, Tanzania, pp. 169-175 in Ecologica Montenegrina 1 (3)</i> on pages 170-17
Gynodiastylis bacescui Petrescu & Chatterjee, 2011, sp. nov.
No full textG <i>ynodiastylis bacescui</i> sp. nov. <p>(Fig. 2 A–J)</p> <p> <b>Material examined.</b> Holotype manca (MGAB CUM 1689). South Andaman: Wandoor (11°40.55’N, 92°45.12’E), Port Blair, Andaman Islands, intertidal sediments among macroalgae (<i>Padina</i> sp.), December 2005; coll. T. Chatterjee.</p> <p> <b>Diagnosis.</b> Elongated carapace, rounded and large telson, reaching half of uropodal peduncle, basis of maxilliped 3 with one short outer plumose seta, uropodal endopod with three articles.</p> <p> <b>Description.</b> Manca. Body, 3.39 mm in length.</p> <p>Carapace (Fig. 2 B). 0.42 of entire body length, 1.7 longer than high, pseudorostral lobes about 0.34 of frontal lobe, ocular lobe, large, rounded, without any visual elements, distinct antennal notch, slight serrate ventral margin.</p> <p>Pereon. 0.14 of entire body length, first segment hardly visible dorsally.</p> <p>Pleon. 0.5 of entire body length, segments robust.</p> <p>Antenna 1 (Fig. 2 C, D). Short, basal article of peduncle as long as other two articles together, main flagellum with three articles and aesthetascs, accessory flagellum with two articles and one apical sensory seta.</p> <p>Maxilliped 3 (Fig. 2 E). Basis 0.45 times as long as entire maxilliped length, two plumose setae on medial margin, without outer process, ischium with one short plumose seta, merus with one long plumose seta on outer margin, carpus as long as ischium and merus together, with one short plumose seta on outer margin, propodus 1.13 times as long as carpus, two short pappose setae on medial margin, dactylus 1.24 times as long as propodus, with short hairs on medial margin. Exopod, small, with three-articled flagellum.</p> <p>Pereopod 1 (Fig. 2 F). Large basis with serrate medial margin, 3 pappose apical setae, rest of pereopod broken. Exopod 2.25 times as long as exopod of maxilliped 3.</p> <p>Pereopod 2 (Fig. 2 G). Basis 0.32 of entire pereopod length, twice as long as merus, as long as propodus and dactylus together, dactylus 1.15 times as long as propodus. Exopod fully developed.</p> <p>Pereopod 3 (Fig. 2 H). Large articles, basis 0.43 times as long as entire pereopod length, 1.5 times as long as merus, merus second largest article, 2.2 times as long as ischium, 2.7 times as long as carpus, 1.12 times as long as propodus, propodus 1.14 times as long as dactylus, dactylus with short terminal robust curved seta like a claw.</p> <p>Pereopod 4 (Fig. 2 I). Large articles, basis 0.39 times as long as entire pereopod length, merus 2 times as long as ischium, 2.7 times as long as carpus, 1.5 times as long as propodus, propodus 0.8 times as long as dactylus, dactylus with short terminal robust curved seta like a claw.</p> <p>Uropod (Fig. 2 J). Peduncle as long as last pleonite, with strongly serrate medial margin, 1.19 times as long as endopod, exopod 0.6 times as long as endopod, with two articles, one robust curved terminal seta, endopod with three articles, proximal article 1.5 times as long as median article, with robust curved terminal seta. Telson round and large, 0.66 times as wide as last pleonite, 0.52 times as long as uropodal peduncle.</p> <p>Male. Unknown.</p> <p> <b>Etymology.</b> The species is named in honour of Mihai Bäcescu (1908–1999), famous Romanian specialist in Cumacea, and master of the first author (IP).</p> <p> <b>Remarks.</b> G <i>ynodiastylis bacescui</i> <b>sp. nov.</b> resembles <i>G. carinirostris</i> Hale (1946) and <i>G. hartmeyeri</i> Zimmer (1914), both of them recorded from New South Wales, Bass Strait (Australia), in having a carapace much longer than high and a uropodal endopod with three articles. It differs from <i>G. carinirostris</i> by lacking visual elements and from <i>G. hartmeyeri</i> by having a more rounded telson. Such a round telson can also be found in <i>G. fulgida</i> Day (1980) and <i>G. profunda</i> Day (1980), both from South Africa and with a uropodal endopod with one article and in <i>G. blax</i> Gerken (2001) from South Australia (with a shorter telson than the new species from Andaman and a uropodal endopod with two articles). <i>G. bacescui</i> <b>sp. nov.</b> differs from all of these species in having the basis of maxilliped 3 with a short plumose outer seta (in contrast with three or four outer setae in the other above-mentioned species) and especially by its enlarged merus of pereopod 3. This is the first record of the genus <i>Gynodiastylis</i> from India.</p>Published as part of <i>Petrescu, Iorgu & Chatterjee, Tapas, 2011, New species and new records of cumaceans (Crustacea: Peracarida: Cumacea) from the Andaman Islands, Indian Ocean, pp. 51-57 in Zootaxa 2966</i> on pages 55-56, DOI: <a href="http://zenodo.org/record/201857">10.5281/zenodo.201857</a>
Real business cycles: a legacy of countercyclical policies?
No full textIf business cycles are caused mostly by changes in productivity, rather than by monetary and financial disturbances, what role do monetary and fiscal policies play? In this article, Satyajit Chatterjee discusses the possibility that countercyclical monetary and fiscal policies have played an important role in reducing the severity of business cycles since World War II but that additional countercyclical policies that try to offset movements in productivity aren't likely to be beneficialBusiness cycles
Copidognathus bruneiensis Chatterjee, Marshall & Pešić, 2012, sp. nov.
No full textCopidognathus bruneiensis sp. nov. (Figures 4–6) Material examined: Holotype, 3, Brunei Darussalam, Kota Batu, Sangai Brunei Estuary and Bay, 4 º 56 'N, 115 º 1 'E, 10.iii. 2011, mud flats and algae covering the pneumatophores of Avicennia marina mangrove trees, leg. T. Chatterjee & D. J. Marshall. Paratypes: three 33 and three ƤƤ, collection data same as holotype. Description: Male: Idiosoma 300–337 µm long. All dorsal plates separate. AD with one anterior and one fused middle areolae. Areolae and costae on dorsal plates made up of porose panel. Pair of ds 1 anteriorly of middle areola on AD. A pair of gland pores near anterolateral margin of AD. AD 87 µm long, 92 µm wide. OC 97 µm long, 50 µm wide (length to width ratio about 1.92), posteriorly caudiform; each with two corneae (in a few specimens posterior cornea slightly constricted in the middle); areola ventromedially between the two corneae; gland pore close to cornea (away from lateral margin); pore canaliculus present on lateral margin of OC and posterior to posterior cornea; ds 2 located at anteromedial part of OC. PD 218 µm long, 158 µm wide, arched anteriorly; paired middle costae two porose panels wide, paired lateral costae one-two porose panels wide, middle and lateral costae joined anteriorly, rest of the plate reticulately panelled; ds 3 -ds 5 on PD between middle and lateral costae. A pair of gland pores on posterior part of PD at middle costae. All ventral plates separate. AE 105 µm long, 87 µm wide, with three pairs of setae and a pair of epimeral pores. Epimeral process absent. Each PE with three ventral setae and one dorsal seta. GA longer than AE. GA 159 µm long, 132 µm wide, GO 51 µm long. Distance between anterior end of GO and that of GA, 69 µm, about 1.40 times the length of GO, 14–16 PGS present, four pairs of SGS present, first, second and fourth pair thin, while third pair thick and spur-like. Spermatopositor large, extending 50 µm ahead from anterior margin of GO. Distance between posterior end of GO and that of GA 36 µm. Gnathosoma 108 µm long, 62 µm wide, about 1.70 times longer than wide. Rostrum about 0.75 times longer than gnathosomal base, 0.43 of total gnathosoma; rostrum tip extending near anterior end of P 2. Palp consisting of four segments. P 1 and P 3 without a seta. P 2 with one dorsal seta distally. P 4 with three long proximal setae, one minute distal seta. P 2 longer than P 4. Proto- and deuto- rostral setae situated at tip of rostrum., tritorostral setae (long maxillary setae of rostrum) on anterior half of rostrum (at about 0.36 of total rostrum length), gnathosomal base with a pair of setae (basirostral setae) anteriorly. Rostral sulcus extending near tritorostral setae. Gnathosomal base ventrolaterally porose. Tectum slightly arched. Chaetotaxy of legs: trochanters I–IV, 1 - 1 - 1 -0; basifemora I–IV, 2 - 2 - 2 - 2; telofemora I–IV, 5 - 5 - 2 - 2; genua I–IV, 4 - 4 - 3 - 3; tibiae I–IV, 7 - 7 - 5 - 5; tarsi (PAS excluded) I–IV, 7 - 4 - 4 - 4. Telofemora III and IV devoid of ventral setae. Tibia I with two long, smooth, pointed ventral setae and one short, thick, proximoventral seta. Tibia II with one slender, smooth ventral seta and two ventromedial bipectinate setae (distal bipectinate seta longer than proximal seta). Tibia III with one thick, bipectinate ventromedial seta. All setae of tibia IV smooth. Tarsus I with three dorsal setae, one solenidion, three ventral setae and two doublet eupathidia PAS. Tarsus II with three dorsal setae, one solenidion and two doublet eupathidia PAS. Tarsus III –IV each with four dorsal setae (distance between two basal setae almost equal or slightly more than height of tarsus) and two PAS (one small spur-like and one seta like). All legs with two lateral claws and a bidentate median claw. Lateral claws with accessory process dorsally. Lateral claws of tarsi II–IV with delicate tines. Female: Idiosoma 299–305 µm long. Structure and armature of body parts resemble the male except that of the GA region. GA 159 µm long, 120 µm wide, GO 69 µm long; distance between anterior end of GO and that of GA 62 µm, about 1.30 times of length of GO. Three pairs of PGS present, anterior pair just above the level of anterior margin of GO, middle pair near the middle and third pair near posterior side of GO. Ovipositor small, just extending beyond anterior margin of GO. Pair of SGS on anterior part of genital sclerites. Etymology: Named after the country where collected. Remarks: The new species has some similarities with members of the ‘ pulcher group’ (Bartsch 1984, 1998; Chatterjee & Chang 2006), in having areolae and costae comprising the porose panel, rosette pores lacking, a pair of gland pores near anterolateral margin of AD, a single pair of gland pores in the posterior portion of PD, the basal-most of the three ventral setae on tibia I short and thick; telofemora III–IV without a ventral seta. However, Copidognathus bruneiensis sp. nov., differs from the species of the ‘ pulcher group’ in having tarsi III–IV each with four dorsal setae. The OC in the ‘ pulcher group’ is small and triangular, while in the present species OC is bigger and caudiform posteriorly. Most of the species of the ‘ pulcher group’ also contain two pairs of basirostral setae on the gnathosoma (or more than two pairs in males of some species) whereas one pair of basirostral setae is found in C. bruneiensis. Among the members of the ‘ pulcher group’ C. triops Viets, 1936 from Caribbean area and C. uniscustatus Bartsch, 1984 from Philippines and Mexico (Viets 1936; Bartsch 1984; Chatterjee & De Troch 2001) have one pair of basirostral setae but differ from the new species in having a pectinate seta on tibia IV. All dorsal plates are fused in C. uniscustatus. C. bengalensis Chatterjee, Annapurna & Chang, 2003 from India (Chatterjee et al. 2003), a species related to the ‘ pulcher group’, lacks the bipectinate setae on tibia IV (as in the present species) but differs in having a completely subdivided posterior cornea on OC, small triangular OC, two pairs of basirostral setae in female, ds 3 on membranous integument and tarsi III–IV with three dorsal setae each. Moreover, in the present new species ds 2 is on the anteromedial part of the OC. The present new species shares some characters with members of the ‘ curassaviensis group’ (Bartsch 1996), including having dorsal plates with porose panels, enlarged gland-pores, the PD with a single pair of gland pores posteriorly, a small ovipositor extending only slightly beyond the GO, telofemora III–IV with two setae each (and no ventral setae) and genu IV with three setae. However, the present species cannot be assigned to the ‘ curassaviensis group’ because it has the rostrum extending only up to the end of P 2 (the palp slightly extends beyond the rostrum in ‘ curassaviensis group’). Further, in the ‘ curassaviensis group’, tibia I has two thick spur-like ventral setae, while the present species has only one small similar seta proximoventrally on tibia I.Published as part of Chatterjee, Tapas, Marshall, David J & Pešić, Vladimir, 2012, New records of Copidognathus mites (Acari: Halacaridae) from mangroves in Brunei Darussalam with descriptions of two new species, pp. 18-30 in Zootaxa 3269 on pages 23-27, DOI: 10.5281/zenodo.21091
Rhabdophrya mumbaiensis Chatterjee & Dovgal & Sautya 2022, n. sp.
No full textRhabdophrya mumbaiensis n. sp. (Fig. 2A–B, 3A–E) Diagnosis: Aloricate, stalked suctorian ciliate with elongated, very slightly laterally flattened, saсciform body with distinct longitudinal folds (Fig. 3A, C). The edges of the body are somewhat thinner than the central part (Fig. 3 B, D). There are up to 33 tentacles, which are rod-like with conically enlarged bases, arranged in two rows along the length of the body lateral edge. Macronucleus ellipsoidal, positioned in the lower part of the cell body. Stalk about the same length as the body, or some longer, transparent, furnished with noticeable longitudinal fold and with widening (physon) in contact zone with the base of the body. Reproduction not observed. Measurements (in µm, based on two individuals): Body length 74–87; body width 32–33; body thickness 23; stalk length 35–51; stalk width 7–11; physon width 11–16; dimensions of macronucleus 16–19×9–11; tentacle length 11–41; number of the tentacles 26–33. Type materials: Type materials for new species are deposited (by third author Sabyasachi Sautya) at CSIRNational Institute of Oceanography Taxonomic Reference Centre, Mumbai, India (CSIR-NIO). Type locality: Navy-Nagar, Mumbai intertidal coralline region; latitude 18°54’17.05’’N longitude 72°48’08.09’’E west coast of India, the Arabian Sea (Fig. 1). Type host: Benthic harpacticoid copepods (Fig. 2A, B). Localization (Attachment place of epibiont on basibiont): Thoracal segments of harpacticoid hosts (Fig. 2A, B). Differential diagnosis: The new species is most relative to R. truncata, R. nymphonis and R. populiformis but differs from these species by ellipsoid instead of band-like macronucleus and presence of physon. The new species differs from R. trimorpha by long stalk with physon and by shorter, compact cell body. Etymology: The specific epithet reflects the type locality Mumbai.Published as part of Chatterjee, Tapas, Dovgal, Igor & Sautya, Sabyasachi, 2022, A new species of genus Rhabdophrya (Ciliophora: Suctorea) from the west coast of India and comments on the genus taxonomy, pp. 293-300 in Zootaxa 5178 (3) on pages 294-297, DOI: 10.11646/zootaxa.5178.3.8, http://zenodo.org/record/702632
Why does countercyclical monetary policy matter?
No full textSatyajit Chatterjee outlines the mainstream view of the benefits of countercyclical monetary policy and the challenge posed to it by recent microfoundations-oriented research. He also considers how this challenge may alter our views about the benefits of countercyclical monetary policy.>Monetary policy
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Review of D. Chatterjee (ed.), \u3cem\u3eThe Ethics of Preventive War\u3c/em\u3e
No full textA review of The Ethics of Preventive War, edited by Deen K. Chatterjee
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