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At least 145 records · Page 8Linked to original sources
PubMed2006

Baculovirus expression of BmAChE3, a cDNA encoding an acetylcholinesterase of Boophilus microplus (Acari: Ixodidae).

The complete cDNA sequence encoding a Boophilus microplus (Canestrini) (Acari: Ixodidae) acetylcholinesterase (AChE3) was expressed in the baculovirus system. The recombinant AChE3 protein (rBmAChE3) was secreted as a soluble form into the cell culture medium and was identified as a functional AChE by substrate specificity and by inhibition with the AChE-specific inhibitors eserine sulfate and BW284c51. Inhibition kinetics of rBmAChE3, in the presence of the organophosphate paraoxon, revealed sensitivity comparable with that of adult, organophosphate-susceptible neural AChE. To our knowledge, this is the first report of the cloning and successful expression of a functional ixodid AChE.

Acetylcholinesterase↗
PubMed2006

Repellency of oils of lemon eucalyptus, geranium, and lavender and the mosquito repellent MyggA natural to Ixodes ricinus (Acari: Ixodidae) in the laboratory and field.

MyggA Natural (Bioglan, Lund, Sweden) is a commercially available repellent against blood-feeding arthropods. It contains 30% of lemon-scented eucalyptus, Corymbia citriodora (Hook.) K. D. Hill & L. A. S. Johnson (Myrtaceae), oil with a minimum of 50% p-menthane-3,8-diol. MyggA Natural also contains small amounts of the essential oils of lavender, Lavandula angustifolia Mill. (Lamiaceae), and geranium, Pelargonium graveolens L'Her. (Geraniaceae). In laboratory bioassays, MyggA Natural and C. citriodora oil exhibited 100% repellency against host-seeking nymphs of Ixodes ricinus (L.) (Acari: Ixodidae). Lavender oil and geranium oil, when diluted to 1% in 1,2-propanediol, had weak repellent activities on I. ricinus nymphs, but when diluted to 30% in 1,2-propanediol had 100% repellencies. 1,2-Propanediol (100%) had no significant repellent activity in comparison with that of the control. In field tests in tick-infested areas in central Sweden, tick repellency of MyggA Natural and C. citriodora oil was tested by the blanket-dragging technique for 4 d during a 6-d period. The repellencies (74 and 85%, respectively) on day 1 are similar (89%) to that of blankets treated in a similar manner with 19% diethyl-methyl-benzamide, based on previous work. Repellencies declined significantly from day 1 to day 6 (74 to 45% for MyggA Natural; 85 to 42% for C. citriodora oil).

Animals↗
PubMed2006

Notes on New World Persicargas ticks (Acari: Argasidae) with description of female Argas (P.) keiransi.

The female of Argas (Persicargas) keiransi Estrada-Peña, Venzal & González-Acuña (Acari: Argasidae) is described from specimens collected in the type locality in Chile. The female has a unique combination of characters in the dorsal cuticle and in the number and pattern of ventrolateral setae in the basis capituli. Additional features on tarsus I chaetotaxy and dorsal plate are provided for the larva of the species, as observed on flat specimens derived from engorged females collected in the type locality. Keys for the larvae of the New World Persicargas are provided as well as illustrations for prominent characters in hypostome and posterolateral setae. The mitochondrial 16S rDNA sequence of A. keiransi has been obtained, and an analysis of the phylogenetic relationships with other ticks is included. Phylogenetic analysis provides support for a Persicargas grouping of species, separated from species in Argas.

Americas↗
PubMed2006

County-level surveillance of white-tailed deer infestation by Ixodes scapularis and Dermacentor albipictus (Acari: Ixodidae) along the Illinois River.

From 1998 to 2003, 4,935 hunter-killed deer in northern and central Illinois were examined for ticks; 4,066 blacklegged ticks, Ixodes scapularis Say, and 6,530 winter ticks, Dermacentor albipictus (Packard) (Acari: Ixodidae), were collected. I. scapularis was the predominant tick species in the northern portion of the study area, with a decreasing north-to-south prevalence gradient. In contrast, D. albipictus was more common in the south with a decreasing south-to-north prevalence gradient. Compared with previous studies, the geographic range for both species expanded into the central portion of the Illinois River. Prevalence and intensity of both tick species were greater on bucks, and infested bucks were geographically more widespread than infested does and fawns. These findings indicate that blacklegged tick and winter tick distributions remain dynamic in the north central United States

Animals↗
PubMed2006

Sarcoptes scabiei (Acari: Sarcoptidae) mite extract modulates expression of cytokines and adhesion molecules by human dermal microvascular endothelial cells.

The inflammatory and immune responses seen with the worldwide disease scabies, caused by the mite Sarcoptes scabiei (De Geer) (Acari: Sarcoptidae), are complex. Clinical symptoms are delayed for weeks in patients when they are infested with scabies for the first time. This study was undertaken to elucidate the role of the human dermal microvascular endothelial cell (HMVEC-D) in modulating the inflammatory and immune responses in the skin to S. scabiei. Extracts of S. scabiei were incubated with HMVEC-D and the expression of adhesion molecules and chemokine receptors on the cells and the secretion of selected cytokines were determined by enzyme-linked immunosorbent assay. S. scabiei extract was found to inhibit HMVEC-D expression of E-selectin and vascular cell adhesion molecule-1, although not intercellular adhesion molecule-1. The secretion of interleukin-8 also was inhibited by S. scabiei extract. S. scabiei extract increased expression of the chemokine receptor CXCR-1 and both down-regulated and up-regulated expression of CXCR-2, depending on the concentration tested. These findings help explain the delayed inflammatory reaction to infestation with S. scabiei.

Animals↗
PubMed2001

Birds disperse ixodid (Acari: Ixodidae) and Borrelia burgdorferi-infected ticks in Canada.

A total of 152 ixodid ticks (Acari: Ixodidae) consisting of nine species was collected from 82 passerine birds (33 species) in 14 locations in Canada from 1996 to 2000. The Lyme disease spirochete Borrelia burgdorferi Johnson, Schmidt, Hyde, Steigerwaldt & Brenner was cultured from the nymph of a blacklegged tick, Ixodes scapularis Say, that had been removed from a common yellowthroat, Geothlypis trichas L., from Bon Portage Island, Nova Scotia. As a result of bird movement, a nymphal I. scapularis removed from a Swainson's thrush, Catharus ustulatus incanus (Godfrey), at Slave Lake, Alberta, during spring migration becomes the new, most western and northern record of this tick species in Canada. Amblyomma longirostre Koch, Amblyomma sabanerae Stoll, and Ixodes baergi Cooley & Kohls are reported for the first time in Canada. Similarly, Amblyomma americanum L., Arnblyomma maculatum Koch, and ixodes muris Bishopp & Smith are reported for the first time on birds in Canada. After removal of an I. muris gravid female from a song sparrow, Melospiza melodia Wilson, at St. Andrews, New Brunswick, eggs were laid, which developed into larvae, and this new tick-host record demonstrates that birds have the potential to start a new tick population. We conclude that passerine birds disperse several species of ixodid ticks in Canada, and during spring migration translocate ticks from the United States, and Central and South America, some of which are infected with B. burgdorferi.

Animals↗
PubMed2002

Acari ectoparasites of bats from Minas Gerais, Brazil.

Ectoparasites were recovered from Brazilian bats captured from April to November 1997 at or near Parque Estadual do Rio Doce, State of Minas Gerais, southeastern Brazil. Sixty bats were collected, representing three families and 13 species. Five Acari families were recorded: Myobiidae, Trombiculidae, Labidocarpidae, Macronyssidae, and Spinturnicidae. The macronyssid Radfordiella desmodi Radovsky (71 specimens) and the spinturnicid Periglichrus iheringi Oudemans (45 specimens) were the most abundant mite species. They were mainly recorded on Desmodus rotundus (Geoffroy) and Artibeus litratus (Ofers), respectively. Among trombiculid chiggers, the genus Colicus Brennan (55 specimens) was predominant and found mainly on Carollia perspicillata (L.). The current study presents new data about host-parasite relationships and increases the understanding of geographical distribution for some mite and chigger species.

Animals↗
PubMed2001

Pathogenicity of entomopathogenic fungi to different developmental stages of Rhipicephalus sanguineus (Acari: Ixodidae).

The pathogenicity of 4 species of entomopathogenic fungi (Hyphomycetes species: Beauveria bassiana, Metarhizium anisopliae, Metarhizium flavoviride, and Paecilomyces fumosoroseus) to various developmental stages of Rhipicephalus sanguineus (Acari: Ixodidae) ticks was compared under laboratory conditions. The most virulent isolate, M. anisopliae-108, caused 92-96% mortality to unfed larvae and nymphs on day 7 postinfection (PI) and 100% mortality to unfed adults and engorged females on day 21 PI. The pathogenicity of M. anisopliae-108 to engorged larvae and nymphs was lower--82.6 and 60%, respectively. All tested B. bassiana, M. flavoviride, and P. fumosoroseus isolates were significantly less virulent (P < 0.05) or avirulent toward most life stages of R. sanguineus. The M. anisopliae and M. flavoviride isolates also prevented or reduced the ability of the ticks to lay eggs several days before their deaths. Female ticks infected by the fungi achieved only 11.3-60.8% of their egg-laying capacity compared with the controls.

Animals↗
PubMed2001

Molecular detection of Ehrlichia phagocytophila genogroup organisms in larvae of Neotrombicula autumnalis (Acari: Trombiculidae) captured in Spain.

Twenty unfed larvae of Neotrombicula autumnalis (Acari: Trombiculidae) collected on vegetation in the north of Spain were examined by polymerase chain reaction for Borrelia burgdorferi (s.l.). rickettsiae, and the Ehrlichia phagocytophila genogroup. At least 10% of the larvae were found to contain granulocytic ehrlichiae. Because the larvae were unfed, they would necessarily have inherited the bacteria through a transovarian transmission pathway.

Animals↗
PubMed2002

Ecology and host specificity of laelapine mites (Acari: Laelapidae) of small mammals in an Atlantic forest area of Brazil.

Mesostigmatic mites of the Laelapinae Berlese, 1892 (Acari: Laelapidae) are nidicolous arthropods that commonly occur in the fur of Neotropical small mammmals. In this 2-yr study, the laelapine acarofauna associated with the small mammal community in an area of Atlantic forest on Ilha Grande, Rio de Janeiro State, was examined, including observations on patterns of host specificity, mite dispersal, ecology, and food habits. A total of 1,347 laelapines was sampled from the pelage of 6 species of small mammals (Marmosops incanus, Nectomys squamipes, Oryzomys russatus, Rhipidomys n. sp., Oxymycterus dasytrichus, and Trinomys dimidiatus), all of which occurred exclusively in monoxenous associations with their hosts. No evidence of a blood meal was observed in the gut of the mites. With the exception of the 2 species of Tur, mite populations on hosts were entirely or nearly restricted to adult females. These results, together with some morphological characteristics of laelapines, reinforce the hypotheses that Neotropical laelapine mites are not ectoparasitic, and that females disperse by phoresy.

Animals↗
PubMed2004

Three new species of Antricola (Acari: Argasidae) from Brazil, with a key to the known species in the genus.

Three new species of Antricola (Acari: Argasidae) are described from adult specimens collected on bat guano in different caves in Brazil. The female of Antricola guglielmonei n. sp. is easily determined by the presence of 2 smooth, depressed areas lacking setae in the posterolateral portions of the dorsum of the idiosoma, together with the partial fusion of the tubercles in the anteromedian portion of the idiosoma. The male of this species has a small spiracular plate surrounded by a pattern of tubercles disposed concentrically in its dorsal portion. Both sexes have cervical grooves very slightly marked. Antricola delacruzi n. sp. represents the only Antricola species with the dorsum of the idiosoma devoid of tubercles in both sexes and with scarce and minute setae placed over the smooth cuticle. The female of A. inexpectata n. sp. is known only from a few specimens. In this species, lines of smooth cuticle lacking setae separate the tubercles of the dorsum. In addition, there are 3 clumps of plumose setae close to the spiracular plate, in the ventrolateral portions of the idiosoma, in 3 well-delimited regions over cuticular thickenings. These 3 species share the peculiarity of a Haller's organ with the anterior pit bearing only 7 + 2 setae. The collection of these new species in Brazilian caves greatly expands the known range of the genus. A key to the adults of all known species of the genus is provided.

Animals↗
PubMed2003

Javanese species of the mite genus Macrocheles (Arachnida: Acari: Gamasina: Macrochelidae).

Twelve mite species of the genus Macrocheles (Acari: Macrochelidae) were collected from the body surface of dung beetles in Java, Indonesia. Of these, three species, i.e., Macrocheles jabarensis, M. jonggolensis, and M. sukabumiensis, were described as new to science. Female of M. dispar was redescribed. Two species, i.e., M. baliensis and M. sukaramiensis, were recorded from Java for the first time. The occurrence of five species previously recorded from Java, i.e., M. hallidayi, M. kraepelini, M. limue, M. oigru, and M. merdarius, were reconfirmed. Taxonomic status of M. sp. aff. glaber was not settled in the present study, because we could not obtain the male and immatures which are indispensable for exact identification. In total 15 species of the genus Macrocheles, including 3 species already recorded but not collected in this research (M. crispa, M. krantzi, and M. subbadius), are known from Java up to date.

Animal Structures↗
PubMed1980

Clinical mange of the black bear, Ursus americanus, associated with Ursicoptes americanus (Acari: Audycoptidae).

Numerous specimens of a mite, Ursicoptes americanus Fain and Johnston, 1970 (Acari: Audycoptidae), were found in skin scrapings from an aged female black bear, Ursus americanus, afflicted with a severe generalized mange. The mite had not been found previously in association with clinical dermatitis. The male, nymph and larva of Ursicoptes americanus, heretofore unknown, are described and the generic diagnosis is amplified. Discovery of the male aids in resolving the questionable taxonomic status of the family Audycoptidae.

Animals↗
PubMedDate not supplied

[First record of the mite genus Neharpyrhyncuhus (Acari: Harpirhynchidae) in the Russian fauna].

The mites of genus Neharpyrhynchus Fain, 1972 (Acari: Harpirhynchidae) are recorded from Rissia for first time. Two species, N. hippolae sp. n. from Hippolais icterina (Passeriformes: Sylviidae) and N. plumaris (Fritsch) from Fringilla coelebs (Passeroformes: Fringillidae) from N. W. Russia was found. N. hippolae sp. n., female holotype (all measurements in mkm, abbreviations--see Fain e.a., 1999): L 517, W 382, LS 179, WS 325, PA 27, thicker than PI 49 and PE 24, pts smooth, vi, ve [symbol: see text] sci are subequal, about 94, l5 247; propodosomal shield not divided; anterior region of pronotum with rounded verrucosites; venter without scales; legs I-II with 2 free segments and strongly developed lobes at their bases; legs III-IV with one segment, bears 4 and 5 setae respectively (in paratypes number of these setae is variable, 4-5). Male: L 227-254, W 210-219, LS 129-134, WS 170-183, pts are smooth, ve 78-87, sci 83-90, sce 89-95, h 90-110; penis 49-56 long; legs III with 2 free segments, basal segment bears seta, apical segment with 5-6 setae; legs IV with one free segment, it bears 4-5 setae. The new species is closely related to N. pilirostris (Berlese et Trouessart, 1889) and distinguished by characters as follows. N. hippolae sp. n. (female): the setae PI about 2 times are longer than PA and PE; the apical segment of legs III-IV bears 4-5 setae. N. pilirostris: setae PA, PI [symbol: see text] PE are subequal; the apical segment of legs III-IV bears 4 setae only. N. plumaris differs from closely related species N. novoplumaris Moss e.a., 1968 by characters as follows. In female of N. plumaris, the setae PA are subequal to PE and 1.6-1.8 times shorter than PI. In N. novoplumaris, the setae PA shorter than PI and PE.

Animals↗
PubMed2001

House dust mites (Acari: Pyroglyphidae) in the cities of Gdańsk and Gdynia (northern Poland).

277 samples of house dust collected in 1996-1998 from 17 flats, three hospitals, two hotels and one students' hostel situated in the cities of Gdansk and Gdynia were subjected to acarological examination. Acari were found in 50 (37.3%) of 134 samples from the flats, in 11 (15.5%) of 71 samples from the hospitals and in 13 (18.1%) of 72 samples from the hotels. The majority of mites (91.6%) was found in samples that originated from the private flats. 95.0% of mites from the flats, 35.0% mites from the hotels and 8.0% mites from the hospitals belonged to two dust mite species of the family Pyroglyphidae: Dermatophagoides pteronyssinus and Dermatophagoides farinae. D. farinae was significantly predominant and composed 82.8% of the whole pyroglyphid collection. Samples from private flats contained significantly more mites than those from hospitals and hotels: mean mites densities per 1 gram of dust were 13.07, 1.03 and 1.00, respectively. The authors suggest that only density of house dust mites in private flats may be clinically important.

Air Pollution, Indoor↗
PubMedDate not supplied

[On systematics of mites of the genus Syringophiloidus (Acari: Syringophilidae) from the european part of Russia].

A new species Syringophiloidus delichonum sp. n. (Acari: Syringophilidae) is described from quills of Delichon urbica (Hirundinidae) and S. glandarii (Fritsch, 1958) from Garrulus glandarius (Corvidae) is redescribed. Syringophiloidus glandarii, female: body length 650-680, width 160-180. Peritremes: longitudinal branch with 11-14 chambers, lateral--with 2 chambers. All propodosomal setae slightly serrate. Length of setae: vi 33-36, ve 87-96, sci 150-180, sce 180-240, h 200-230, dl 210-230, d2 140-170, d4 25-32, d5 33-40, l1 190-210, l2 150-170, l4 250-280, l5 310-320, pg1 140-150, pg2 120-160, pg3 190-200, g1, g2 40-45, a1, a2 25-33. Male. Body length 500-520, width 150-170. Peritremes: longitudinal branch with 13-14 chambers, lateral with 4 chambers. Length of setae: vi 32-36, ve 50-56, sci 74-80, sce 120-135, h 90-100, d1 135-140, d2 13-22, d5 20-22, l1 24-45, l2 13-22, l5 180-200, pg1 90-110, pg2 70-90. S. glandarii is closely related to S. presentalis Chirov et Kravsova, 1995. It is distinguished from the latter species by following characters. In female S. glandarii, setae vi, ve are thick and serrate, ve 87-96 in length. In female S. presentalis, setae vi, ve are thin and nude, ve 40-70 in length. Syringophiloidus delichonum sp. n., female (holotype): body length 900, width 135. Peritremes: longitudinal branch with 8 chambers, lateral--with 1-2 chambers. All setae nude. Length of setae: vi 45, ve 90, sci 200, sce 200, h 225, d2 90, d4 35, d5 33, l1 140, l2 ?, 155-160 in paratypes, l4 230, l5 320, pg1 135, pg2 120, pg3 170, g1, g2 40, a1, a2 17. Male Body length 506, width 135. Peritremes: longitudinal branch with 9 chambers, lateral with 2 chambers. Length of setae; vi 33, ve 78, sci 90, sce 123, h 130, d1 135, d2 15, d5 17, l1 22, l2 15, l5 180, pg1 105, pg2 45. S. delichonum sp. n. is closely related to S. presentalis, but differs by following characters. In female S. delichonum sp. n., body length is 850-920; longitudinal branch of peritreme includes 6-8 chambers; setae ve 85-90 in length; in male, longitudinal branch of peritreme include 9 chambers. In female S. glandarii, body length 630-700; longitudinal branch of peritreme include 10-11 chambers; setae ve 40-70 in length; in male, longitudinal branch of peritreme include 11-13 chambers.

Animals↗
PubMedDate not supplied

[A new mite species Radfordia sigmomys sp. n. (Acari: Myobiidae) parasitizing Sigmodon alstoni (Rodentia: Sigmodontidae) from Central America].

A new myobiid species Radfordia (Hesperomyobia) sigmomys sp. n. (Acari: Myobiidae) ex Sigmodon alstoni (Rodentia: Sigmodontidae) from Central America is described. This description is based from the females, proto-, dueto- and tritonymphs. Female (4 spec.). Body 500-510 (in micrometers) long and 295-320 wide. Length of setae: ve 90-95--widely lanceolate, 10-15; vi 23-25, sci 95-105, sce 90-100, d1 80-85, d2 70-90, d3 20-25, d4 23-27, l1 75-90, l2 80-85, l3 25-27--all narrowly lanceolate; d5 10-15, l4 10-15, ic1 25-30, ic2 80-90, ic3 85-90, ic4 15-18, pg1 10-15, pg2 30-40, pg3 8-10--all hair-like. Protonymph (2 spec.). Idiosoma with 14 pairs of dorsal setae, including el and 2 pairs of very short anal setae, and 4 pairs of ventral setae, including l5. Length of setae: vi 25, ve 23-25, sci 50-52, sce 125-130, d1 18, d2 16, d3 10-12, l1 10-15, l2 12-16, l3 10-13--all lanceolate; d4 6, ic1 l1, ic2 25-27, ic3 15--all hair-like. Leg chaetotaxy II-III: II coxa 0--trochanter 0--genu + femur 2 (1 solenidion)--tibia 4--tarsus 7 (1 solenidion), III 0-0-0-3-6. Deutonymph (2 spec.). Setae 14 added. Length of setae: vi 25-27, ve 30-35, sci 65-70, sce 120-155, d1 20, d2 16-18, d3 11-13, d4 10-13, l1 20-27, l2 10-15, l3 l1--all lanceolate; l4 6, ic1 13-15, ic2 35-40, ic3 25--all hair-like. Leg chaetotaxy II-III: II 0-0-3(1)-4-7(1), III 0-0-1-3-6. Tritonymph (2 spec.). Setae d5 and ic4 added. Length of setae: vi 34(35), ve 45(40), sci 80(75), sce 140(150), d1 23(25), d2 25(25), d3 13(10), d4 13(10), l1 100(90), l2 22(25), l3 25(27)--all lanceolate; l4 6(5), d5 4(5), ic1 12(15), ic2 45(50), ic3 35(40)--all hair-like; setae 14 microchaetae. Leg chaetotaxy II-IV: II 1-1-3(1)-4-7(1), III 0-1-1-3-6, IV 0-0-1-3-4. This new species is closely related to R. (H). sigmodontis Radford, 1951 ex Sigmodon hispidus from USA. The females of these two species are not distinguishable from each other. While the tritonymphs differ by the following characters. In R. (H.) sigmomys sp. n., the length of setae ic2 and ic3 are 40-50, sci--75-80, l1 90-100. In R. (H.) sigmodontis, the setae ic2 and ic3 are microchaetae, the setae sci and l1 are 30-40 and 10-15 in length respectively.

Animals↗