526 results match your criteria arachnid eye

A taxonomic revision of the spider genus Meriola Banks (Araneae: Trachelidae).

Zootaxa 2021 Feb 24;4936(1):zootaxa.4936.1.1. Epub 2021 Feb 24.

Division of Arachnology, Museo Argentino de Ciencias Naturales "Bernardino Rivadavia", Av. Ángel Gallardo 470 (C1405DJR), Buenos Aires, Argentina.

The genus Meriola Banks currently includes 24 known species of spiders distributed across America, especially in southern South America. They have a nearly straight and narrower posterior eye row compared to other American genera of Trachelidae, and elongated and sharply tipped ventral leg cuspules. The study of specimens of Meriola available in collections revealed two undescribed species, M. Read More

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February 2021

Outsourcing a visual neuropil - The central visual system of the median eyes of Galeodes granti Pocock, 1903 (Arachnida: Solifugae).

Arthropod Struct Dev 2021 Jan 28;60:101024. Epub 2020 Dec 28.

Bavarian State Collection of Zoology - SNSB, Münchhausenstraße 21, 81247, Munich, Germany; Ludwig-Maximilians-Universität München, Department Biologie II, Großhaderner Straße 2, 82152 Planegg-Martinsried, Germany; GeoBioCenter(LMU), Richard -Wagner-Str. 10, 80333 Munich, Germany.

Only a few studies have examined the central visual system of Solifugae until now. To get new insights suitable for phylogenetic analysis we studied the R-cell (or retinula cell) projections and visual neuropils of Galeodes granti using various methods. G. Read More

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January 2021

Systemic paralogy and function of retinal determination network homologs in arachnids.

BMC Genomics 2020 Nov 23;21(1):811. Epub 2020 Nov 23.

Department of Integrative Biology, University of Wisconsin-Madison, Madison, WI, 53706, USA.

Background: Arachnids are important components of cave ecosystems and display many examples of troglomorphisms, such as blindness, depigmentation, and elongate appendages. Little is known about how the eyes of arachnids are specified genetically, let alone the mechanisms for eye reduction and loss in troglomorphic arachnids. Additionally, duplication of Retinal Determination Gene Network (RDGN) homologs in spiders has convoluted functional inferences extrapolated from single-copy homologs in pancrustacean models. Read More

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November 2020

[Demodex and ocular surface disease].

J Fr Ophtalmol 2020 Dec 27;43(10):1069-1077. Epub 2020 Oct 27.

Service d'ophtalmologie, hôpital Bicêtre, CHU de Bicêtre, Assistance Publique-Hôpitaux de Paris, université Paris-Saclay, réseau OPHTARA : maladies rares en ophtalmologie, Paris, France; Département immunologie des maladies virales, auto-immunes, bactériennes et hématologiques (IMVA-HB). UMR 1184, CEA, Fontenay-Aux-Roses, France. Electronic address:

Demodex is a saprophytic mite of the ocular adnexa, which can in certain circumstances proliferate on the skin of the face and on the eyelid margins. It is involved in facial rosacea (especially in the papulopustular form) and in the development or aggravation of anterior and/or posterior blepharitis or even keratoconjunctivitis, often in association with cutaneous lesions ; the pathophysiology is often multifactorial. Symptoms are non-specific, but the presence of cylindrical sleeves on the eyelashes is very suggestive of infestation, and certain techniques of biomicroscopic examination or imaging, such as confocal microscopy in vivo, allow direct visualization of the parasite. Read More

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December 2020

Thunberga gen. nov., a new genus of huntsman spiders from Madagascar
(Araneae: Sparassidae: Heteropodinae).

Peter JÄger

Zootaxa 2020 Jun 11;4790(2):zootaxa.4790.2.3. Epub 2020 Jun 11.

Senckenberg Research Institute, Arachnology, Mertonstraße 17-21, 60325 Frankfurt am Main, Germany.

A new genus of the family Sparassidae is described from Madagascar: Thunberga gen. nov. It can be distinguished from other genera of the Heteropodinae by its different cheliceral dentition and eye arrangement as well as by its uniquely dotted prosoma. Read More

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House Dust Mite Related Allergic Rhinitis and REM Sleep Disturbances.

Am J Otolaryngol 2020 Nov - Dec;41(6):102709. Epub 2020 Aug 24.

Department of Otolaryngology Head and Neck Surgery, Icahn School of Medicine at Mount Sinai, New York, NY, USA; Department of Otolaryngology, New York Medical College, USA.

Purpose: Sleep disturbances are common in patients with allergic rhinitis (AR). Perennial allergens like house dust mites (HDM) are difficult to avoid and have nocturnal impacts on the respiratory system and Quality of Life (QOL). The Rapid Eye Movement (REM) sleep stage is associated with memory, cognition, dreams, and overall restfulness, which can be impaired in AR patients with Sleep Disordered Breathing (SDB) even when normal all-night apnea-hypopnea (AHI) or respiratory disturbance (RDI) indices are noted on polysomnography (PSG). Read More

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January 2021

In which rosacea patients should in the eyelashes be investigated?

A Ogrum S Alim

Niger J Clin Pract 2020 Aug;23(8):1039-1043

Department of Ophthalmology, School of Medicine, Gaziosmanpasa University, Tokat, Turkey.

Aim: The aim of this study was to investigate the relationship between the presence of Demodex on the face and within the eyelash follicles in patients with rosacea.

Subjects And Methods: This prospective cross-sectional study included 80 participants, 40 patients with rosacea and 40 individuals with no rosacea as controls. The presence of Demodex on the face was assessed by standard superficial skin biopsy. Read More

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Tick infestation of the eyelid.

Rev Soc Bras Med Trop 2020;53:e20190599. Epub 2020 Jun 12.

Department of Microbiology, Amrita Institute of Medical Sciences, Amrita Vishwa Vidyapeetham, Ponekara, Kochi, Kerala India.

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September 2020

Blepharitis Caused by

Turkiye Parazitol Derg 2020 Mar;44(1):21-24

Çukurova Üniversitesi Tıp Fakültesi, Parazitoloji Anabilim Dalı, Adana, Türkiye

Objective: Demodicosis is a Skin disease in humans caused by and mites. infestation is mostly located in sebaceous and meibomian glands in the hair follicles. The aim of this study was to determine the age and sex distribution of Demodex infestation in patients with blepharitis. Read More

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Kinome Analysis of Honeybee (Apis mellifera L.) Dark-Eyed Pupae Identifies Biomarkers and Mechanisms of Tolerance to Varroa Mite Infestation.

Sci Rep 2020 02 7;10(1):2117. Epub 2020 Feb 7.

Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, SK, Canada.

The mite Varroa destructor is a serious threat to honeybee populations. Selective breeding for Varroa mite tolerance could be accelerated by biomarkers within individual bees that could be applied to evaluate a colony phenotype. Previously, we demonstrated differences in kinase-mediated signaling between bees from colonies of extreme phenotypes of mite susceptibility. Read More

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February 2020

Periorbital Edema Mimicking an Allergic Reaction After Black Widow Envenomation.

Wilderness Environ Med 2020 03 31;31(1):116-118. Epub 2020 Jan 31.

Department of Medical Toxicology, University Medical Center PhoenixPhoenix, Arizona; Department of Emergency Medicine, University of Arizona College of Medicine Phoenix, Phoenix, Arizona.

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Double-Masked and Unmasked Prospective Study of Terpinen-4-ol Lid Scrubs With Microblepharoexfoliation for the Treatment of Demodex Blepharitis.

Cornea 2020 Apr;39(4):408-416

Ophthalmic Consultants of Long Island, Rockville Centre, NY.

Purpose: To evaluate terpinen-4-ol lid scrubs (Cliradex) with Microblepharoexfoliation (MBE) (BlephEx) in the treatment of Demodex blepharitis.

Methods: An Institutional Review Board (IRB) approved the randomized prospective double-masked trial of 50 patients with Demodex positive blepharitis. All subjects were given an in-office MBE treatment and randomized to masked lid scrubs (terpinen-4-ol or sham) twice daily for 1 month. Read More

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Predictive methods for efficacy of house dust mite subcutaneous immunotherapy in allergic rhinitis patients: a prospective study in a Chinese population.

Int Forum Allergy Rhinol 2020 03 23;10(3):314-319. Epub 2019 Dec 23.

Department of Otolaryngology, Head and Neck Surgery, Affiliated Eye, Ear, Nose and Throat Hospital, Fudan University, Shanghai, China.

Background: Allergen-specific immunotherapy (AIT) is the only available treatment that can induce specific immune tolerance to allergens. However, the treatment course lasts >3 years, and there is no reliable method to predict treatment response. Therefore, in this study we aimed to establish a method that can predict treatment response to AIT in the second year. Read More

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The visual spectral sensitivity of the Chilean recluse spider .

J Exp Biol 2020 01 22;223(Pt 2). Epub 2020 Jan 22.

Centro Interdisciplinario de Neurociencia de Valparaíso (CINV), Facultad de Ciencias, Universidad de Valparaíso, Valparaíso 2381850, Chile

Spiders are a large group of arthropods and nearly omnipresent in warm and temperate climates. They rely on tactile and visual information to hunt and breed, but compared with their mechanical senses, little is known about their visual systems. In this study, we analyzed the visual spectral sensitivity of the Chilean recluse spider , a synanthropic species posing a significant threat to humans, using electroretinogram recordings of its three eye types and open field tests with localized chromatic illumination for behavioral analysis. Read More

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January 2020

Mitespotting: approaches for Aculops lycopersici monitoring in tomato cultivation.

Exp Appl Acarol 2020 Jan 17;80(1):1-15. Epub 2019 Dec 17.

Julius Kühn Institute, Institute for Plant Protection in Horticulture and Forests, Messeweg 11-12, 38104, Braunschweig, Germany.

Aculops lycopersici is a major pest in tomato cultivation worldwide, and lately its relevance in German tomato cultivation has increased markedly. Aculops lycopersici causes damage to tomato plants by feeding on the surface of leaves, stem and fruits and can lead to the loss of whole plants. Given the small size of the pest, A. Read More

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January 2020

Bristle Worm-Induced Keratouveitis: A Case Report.

Cornea 2020 May;39(5):654-656

Bristol Eye Hospital, Bristol, United Kingdom; and.

Purpose: To report keratouveitis arising from corneal penetration by a bristle worm seta (bristle).

Methods: We report on a 64-year-old woman presenting with uniocular pain, redness, reduced vision, discharge, and pustular rash of the hands after cleaning out her marine aquarium containing bristle worms and rubbing her eye.

Results: Slit-lamp biomicroscopy showed pseudomembranous conjunctivitis, corneal punctate erosions, stromal infiltrate, and edema, but no visible foreign body. Read More

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The Clinical Use of Eyelash Manipulation in the Diagnosis of Demodex Folliculorum Blepharitis.

Eye Contact Lens 2020 Jan;46(1):e6

School of Physics & Clinical & Optometric Sciences, Technological University, Dublin, Ireland.

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January 2020

Establishment of correctly focused eyes may not require visual input in arthropods.

J Exp Biol 2020 01 6;223(Pt 1). Epub 2020 Jan 6.

Department of Biological Sciences, University of Cincinnati, Cincinnati, OH 45221, USA

For proper function, vertebrate and invertebrate visual systems must be able to achieve and maintain emmetropia, a state where distant objects are in focus on the retina. In vertebrates, this is accomplished through a combination of genetic control during early development and homeostatic visual input that fine-tunes the optics of the eye. While emmetropization has long been researched in vertebrates, it is largely unknown how emmetropia is established in arthropods. Read More

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January 2020

Insights into the 400 million-year-old eyes of giant sea scorpions (Eurypterida) suggest the structure of Palaeozoic compound eyes.

Sci Rep 2019 11 28;9(1):17797. Epub 2019 Nov 28.

University of Edinburgh, Grant Institute, School of Geosciences, West Mains Road, Edinburgh, EH9 3JW, Scotland.

Sea scorpions (Eurypterida, Chelicerata) of the Lower Devonian (~400 Mya) lived as large, aquatic predators. The structure of modern chelicerate eyes is very different from that of mandibulate compound eyes [Mandibulata: Crustacea and Tracheata (Hexapoda, such as insects, and Myriapoda)]. Here we show that the visual system of Lower Devonian (~400 Mya) eurypterids closely matches that of xiphosurans (Xiphosura, Chelicerata). Read More

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November 2019

Compact single-shot metalens depth sensors inspired by eyes of jumping spiders.

Proc Natl Acad Sci U S A 2019 11 28;116(46):22959-22965. Epub 2019 Oct 28.

John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138.

Jumping spiders (Salticidae) rely on accurate depth perception for predation and navigation. They accomplish depth perception, despite their tiny brains, by using specialized optics. Each principal eye includes a multitiered retina that simultaneously receives multiple images with different amounts of defocus, and from these images, distance is decoded with relatively little computation. Read More

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November 2019

Eye trapped an arachnid: Horrific but true!

Indian J Ophthalmol 2019 11;67(11):1885

Dr. Rajendra Prasad Centre for Ophthalmic Sciences, AIIMS, New Delhi, India.

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November 2019

Intense Pulsed Light Therapy for Patients with Meibomian Gland Dysfunction and Ocular Demodex Infestation.

Curr Med Sci 2019 Oct 14;39(5):800-809. Epub 2019 Oct 14.

Department of Ophthalmology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.

To observe the clinical changes of meibomian gland dysfunctipn (MGD) and ocular Demodex infestation after intense pulsed light (IPL) treatment to further examine the mechanism of IPL treating patients with MGD and ocular Demodex infestation. The medical records of 25 patients (49 eyes) with MGD treated with IPL, were retrospectively examined to determine outcomes. Associated ocular-surface parameters (ocular surface disease index, OSDI; lipid layer thickness, LLT; noninvasive first breakup time, NIF-BUT; noninvasive average breakup time, NIAvg-BUT; tear film breakup area, TBUA; Schirmer I Test, SIT; corneal fluorescein staining, CFS), eyelid margin abnormalities, meibum quality and expressibility, MG morphological parameters (macrostructure and microstructure), and the number of Demodex infestation were examined before and after treatment. Read More

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October 2019

Increased frequency of Demodex blepharitis in rosacea and facial demodicosis patients.

J Cosmet Dermatol 2020 May 25;19(5):1260-1265. Epub 2019 Sep 25.

Department of Dermatology, Liv Hospital Ulus, Istanbul, Turkey.

Background: Rosacea is an inflammatory disease with 50% of ocular involvement rate. Primary demodicosis is an eruption caused by Demodex mites, and there is no data about the rate of ocular involvement in primary demodicosis.

Aims: In this cross-sectional study, it is aimed to reveal the frequency of Demodex blepharitis in rosacea and primary demodicosis patients. Read More

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Clinical efficacy and safety of cervical intralymphatic immunotherapy for house dust mite allergic rhinitis: A pilot study.

Am J Otolaryngol 2019 Nov - Dec;40(6):102280. Epub 2019 Aug 27.

First People's Hospital of Foshan, China. Electronic address:

Background: Previous studies have demonstrated that intralymphatic immunotherapy (ILIT), a less time-consuming alternative to conventional subcutaneous immunotherapy (SCIT), is safe and effective. However, because of the private location of inguinal lymph nodes, inguinal ILIT is relatively inconvenient. We proposed a novel form of ILIT that involves 3 injections of allergen into cervical lymph nodes. Read More

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Is the presence of increased with impaired glucose regulation in polycystic ovary syndrome?

J Obstet Gynaecol 2020 May 10;40(4):546-550. Epub 2019 Sep 10.

Department of Microbiology, Karabuk University, Educational and Research Hospital, Karabuk, Turkey.

parasites may cause skin and eyelash lesions by settling on the pilosebaceous unit. This parasite plays a role in the pathophysiology of acne in polycystic ovarian syndrome (PCOS). We aimed to examine the relationship between and blood glucose control in patients with PCOS with skin and eyelash lesions. Read More

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The Clinical Use of Eyelash Manipulation in the Diagnosis of Demodex Folliculorum Blepharitis.

Eye Contact Lens 2020 Jan;46(1):e5-e6

Department of Cornea, Anand Eye Institute, Hyderabad, India.

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January 2020

The Effect of Ocular Demodex Colonization on Schirmer test and OSDI Scores in Newly Diagnosed Dry Eye Patients.

Eye Contact Lens 2020 Jan;46 Suppl 1:S39-S41

Departments of Ophthalmology (T.A.) and Microbiology (F.M.S.), Kirşehir Ahi Evran University Medicine Faculty, Kirşehir, Turkey.

Objective: To determine whether ocular Demodex colonization results in differences in Schirmer test scores and Ocular Surface Disease Index (OSDI) questionnaire values in individuals with dry eye disease (DED) diagnosed for the first time.

Method: Eighty-eight adults aged 40 to 68 years who were admitted to Ophthalmology outpatient clinic for routine ophthalmological examination or presbyopia examination and diagnosed with DED for the first time and who do not have any chronic disease were included in the study. All the patients were asked to complete the OSDI, which is widely used for assessing dry eye symptom severity and vision-related functioning. Read More

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January 2020

Convergent evolution of cytochrome P450s underlies independent origins of keto-carotenoid pigmentation in animals.

Proc Biol Sci 2019 07 17;286(1907):20191039. Epub 2019 Jul 17.

Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.

Keto-carotenoids contribute to many important traits in animals, including vision and coloration. In a great number of animal species, keto-carotenoids are endogenously produced from carotenoids by carotenoid ketolases. Despite the ubiquity and functional importance of keto-carotenoids in animals, the underlying genetic architectures of their production have remained enigmatic. Read More

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HLA-II genes are associated with outcomes of specific immunotherapy for allergic rhinitis.

Int Forum Allergy Rhinol 2019 11 12;9(11):1311-1317. Epub 2019 Jul 12.

Department of Otolaryngology Head and Neck Surgery, Beijing TongRen Hospital, Capital Medical University, Beijing, China.

Background: Although the precise mechanisms underlying the efficacy of allergen-specific immunotherapy (AIT) are not clear, some evidence suggests that this may be linked to polymorphisms in HLA-II gene. We aimed to investigate the correlation between HLA-II gene polymorphisms and house dust mite (HDM)-specific immunotherapy efficacy, and evaluate specific polymorphisms as potential biomarkers in allergic rhinitis (AR) patients who would benefit most from AIT.

Methods: Fifty-one Han Chinese patients with AR receiving HDM AIT were recruited. Read More

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November 2019

Efficacy of treatments for Demodex blepharitis: A systematic review and meta-analysis.

Ocul Surf 2019 10 20;17(4):655-669. Epub 2019 Jun 20.

University Hospital of Clermont-Ferrand, CNRS, LaPSCo, Physiological and Psychosocial Stress, CHU Clermont-Ferrand, Preventive and Occupational Medicine, Witty Fit, F-63000, Clermont-Ferrand, France; Australian Catholic University, Faculty of Health, School of Exercise Science, Melbourne, Victoria, 3065, Australia.

Purpose: We conducted a systematic review and meta-analysis to evaluate the efficacy of different treatment for Demodex blepharitis. Parameters studied were mites count, improvement of symptoms and mites' eradication, stratified on type of treatments and mode of delivery of treatments (local or systemic).

Method: The PubMed, Cochrane Library, Embase, ClinicalTrials. Read More

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October 2019