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The mode of attachment of mite larvae (Leptus spp.) to harvestmen (Opiliones)

Published on Feb 1, 1988in Journal of Natural History0.837
· DOI :10.1080/00222938800770091
Arnold Åbro9
Estimated H-index: 9
(University of Bergen)
Abstract
Larval mites of the Leptus group (Family Erythraeidae), ectoparasitic on adult harvestmen, deposit at the attachment site a cementing substance forming a superficial cone that concurrently with the distension of the distal portions of the inserted chelicerae promotes firm anchorage in order to ensure the long attachment of the larvae to the host. The larvae, which suck up haemolymph plasma and tissue fluids, were not found to develop a stylostome. Violent defence reactions by the host have not been demonstrated. While granular haemocytes migrate to the bite site they do not establish cell aggregations or capsular formations. A coat of coagulated haemolymph plasma, presumably not mediated by the granular haemocytes, is deposited on organic structures at the bite site. A melanization of the coagulum has not been recognized. The non-appearance of a stylostome is thought to be connected with the mild defence reactions on the part of the host.
  • References (15)
  • Citations (11)
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References15
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Arrenurid water-mite larvae, ectoparasitic on zygopteran imagines (Odonata), attach themselves to the host s cuticle and pierce it with the cheliceral blades to obtain the host s tissue fluids. Promptly after anchoring in feeding position, secretions of the larval mite are forced into the host beneath the attachment site, where a subcuticular vesicle, bounded by a delicate gelatinous membrane, appears in the epidermis layer. The vesicle constitutes a local space of thin fluid into which the larv...
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Abstract Arrenurus larvae, ectoparasitic on zygopteran imagoes, attach to the host's cuticle and tear it to obtain the host's tissue fluids. Within the host's epidermis, each larval mite produces a feeding device, the stylostome, a narrow gelatinous resilient blind sac. Heavy mite infestation brings about several wounds in close proximity, accompanied by loss of more or less extensive areas of the epidermis. Despite wound repair by congregating hemocytes, local lack of epidermis seems to enfeebl...
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I1 . Haemocytes in haemolymph coagulation . . . . . . . (a) Cystocytes . . . . . . . . . . . (i) Light microscopic features . . . . . . . (ii) Ultrastructure . . . . . . . . . (iii) Histochemistry . . . . . . . . . (iv) Terminology . . . . . . . . . (b) Granular haemocytes . . . . . . . . . (i) Light microscopic features . . . . . . . (iii) Histochemistry . . . . . . . . . (2) Cystocytes in coagulation . . . . . . . . .
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