Comparative scanning electron microscopy of <i>Gasterophilus </i>third instars

Colwell, Douglas D.; Otranto, Domenico; Horak, Ivan G.

doi:10.1111/j.1365-2915.2007.00692.x

Cited by 20 publications

(19 citation statements)

References 14 publications

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“…4A and 5A) [11,16,[19][20][21]23,[25][26][27]29,32]. In Calliphoridae, the noticeable segments of the larvae could be grouped as pseudocephalon or cephalic region (first membranous segment, probably evolved from three embryonic segments), thorax (from second to fourth segments; they will be called tI, tII and tIII) and abdomen (from fifth to twelfth segments; they will be called aI to aVIII) [23,32,49], although the 12th segment is also known as the anal division (e.g., Refs.…”

Section: Resultsmentioning

confidence: 99%

Morphology of preimaginal stages of Calliphora vicina Robineau-Desvoidy, 1830 (Diptera, Calliphoridae): A comparative study

Ubero-Pascal¹,

López-Esclapez²,

García³

et al. 2012

Forensic Science International

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Section: Resultsmentioning

confidence: 99%

Morphology of preimaginal stages of Calliphora vicina Robineau-Desvoidy, 1830 (Diptera, Calliphoridae): A comparative study

Ubero-Pascal¹,

López-Esclapez²,

García³

et al. 2012

Forensic Science International

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“…Las larvas de moscas Gasterophilus son parásitos obligados de équidos debido a que su ciclo biológico transita, imperativamente, por un hospedero vivo para la ovoposición y desarrollo de sus larvas que se adhieren a la mucosa de diversas regiones del tracto gastrointestinal 17 , por lo que son parásitos del estómago y afectan a équidos de todas las edades 37 .…”

Section: Introductionunclassified

Ocurrencia de miasis cavitaria equina (Gasterophilus Spp) y su relación con las úlceras gástricas secundarias en la mucosa escamosa en Temuco, Chile

Cardona

Álvarez

Paredes

2016

Ces. Med. Vet. Zootec.

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Cardona JA et al. Ocurrencia de miasis cavitaria equina (Gasterophilus Spp) y su relación con las úlceras gástricas ¤ Para citar este artículo: Cardona JÁ, Álvarez A, Paredes E. Ocurrencia de miasis cavitaria equina (Gasterophilus Spp) y su relación con las úlceras gástricas secundarias en la mucosa escamosa en AbstractThe aim of this study was to determine the ocurrence of equine cavitary myiasis (Gasterophilus spp) in the CholChol slaughtering house in Temuco, Chile and its relation with the presentation of secondary gastric ulcers in the non-glandular squamous mucosa of the horses' (Equus caballus) stomachs. Of 240 stomachs evaluated post mortem, 145 were selected and characterized as positive to gasterophilosis (60.4%), of which 75 were males (20 stallions and 55 geldings) and 70 were mares, with ages ranging from 1 to 16 years. Every stomach was evaluated, characterized and photographed post mortem. Information about sex, age, location of the Gasterophilus larvae, presence and degree of ulceration of the squamous mucosa, were recorded in the respective forms and posteriorly digitalized. Global analysis of the location of larvae in the stomach of horses positive to gasterophilosis, established that 91.7% were located in the glandular mucosa, while 8.3% were located in the squamous mucosa. In the stomachs with presence of larvae in the antral/piloric regions of the glandular mucosa, 87.6% had secondary ulcers in the nonglandular squamous mucosa, due to the increase in the gastric fill line following alterations in gastric emptying, of which 69% were classified in categories 3 to 4 with a number of larvae higher tan 30, while 18.6% were found in categories 1 or 2 with less than 30 larvae per site. Regarding the location of larvae in the squamous mucosa, 8.3% of the stomachs showed primary mechanic ulcers, all classified between grades 1 and 2. Of all the animals evaluated, 62.1% had more tan 60 larvae, of which 60.1% had grade 3 or 4 secondary squamous ulcers, 15.9% had between 30 and 60 larvae per site, and 14.5% had less than 30 larvae per site. The study showed significant statistical dependence (p<0.05) between the number of larvae located in the glandular mucosa and the degree of severity of the secondary gastric ulcers in the squamous mucosa. Concluding, a high ocurrence of cavitary gastric myiasis was observed in slaughtering horses in the south of Chile, with squamous ulcers secondary to abnormal gastric emptying being the

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“…Scanning electron microscopy has been used to examine the pathology associated with the different instars of Gasterophilus spp. (Shefstad, 1978; Cogley, 1989) and to analyse the morphological and sensorial properties necessary to enable the larvae to complete their lifecycle inside their host (Principato & Tosti, 1988; Cogley, 1999; Leite & Scott, 1999; Leite et al , 1999; Colwell et al , 2007). However, a description of the structure of the digestive system of Gasterophilus species is lacking.…”

Section: Introductionmentioning

confidence: 99%

Light and electron microscopy studies of the midgut and salivary glands of second and third instars of the horse stomach bot, Gasterophilus intestinalis

Roelfstra

Vlimant

Betschart

et al. 2010

Medical and Veterinary Entomology

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Abstract.A morphological study of the midgut and salivary glands of second and third instars of Gasterophilus intestinalis (De Geer) (Diptera: Oestridae) was conducted by light, scanning and transmission electron microscopy. The midgut is anteriorly delimited by a proventriculus, without caeca, and is composed of posterior foregut and anterior midgut tissue from which a double-layered peritrophic matrix is produced. The midgut can be divided into anterior, median and posterior regions on the basis of the structural and physiological variations of the columnar cells which occur along its length. Two other types of cell were identified: regenerative cells scattered throughout the columnar cells, and, more rarely, endocrine cells of two structural types (closed and open). Different secretion mechanisms (merocrine, apocrine and microapocrine) occur along the midgut epithelium. Abundant microorganisms are observed in the endoperitrophic space of the anterior midgut. The origin and nature of these microorganisms remain unknown. No structural differences are observed between the second and third instar midguts. The salivary glands of G. intestinalis second and third instars consist of a pair of elongated tubular structures connected to efferent ducts which unite to form a single deferent duct linked dorsally to the pharynx. Several intermediate cells, without cuticle, make the junction with the salivary gland epithelium layer. Cytological characteristics of the gland epithelial cells demonstrate high cellular activity and some structural variations are noticed between the two larval stages.

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Comparative scanning electron microscopy of Gasterophilus third instars

Cited by 20 publications

References 14 publications

Morphology of preimaginal stages of Calliphora vicina Robineau-Desvoidy, 1830 (Diptera, Calliphoridae): A comparative study

Morphology of preimaginal stages of Calliphora vicina Robineau-Desvoidy, 1830 (Diptera, Calliphoridae): A comparative study

Ocurrencia de miasis cavitaria equina (Gasterophilus Spp) y su relación con las úlceras gástricas secundarias en la mucosa escamosa en Temuco, Chile

Light and electron microscopy studies of the midgut and salivary glands of second and third instars of the horse stomach bot, Gasterophilus intestinalis

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