Journal
EXPERIMENTAL AND APPLIED ACAROLOGY
Volume 82, Issue 3, Pages 359-378Publisher
SPRINGER
DOI: 10.1007/s10493-020-00553-8
Keywords
Ectoparasites; Feeding tubes; Parasitengona; Host-parasite interaction; Ultrastructure
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Funding
- Wroclaw Centre of Biotechnology, program Leading National Research Centre (KNOW) for 2014-2018
- Russian Foundation for Fundamental Research [N 18-04-00075-a]
- State Federal Scientific Program [AAAA-A19-119020790133-6]
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The morphology and formation of stylostomes (feeding tubes) in hosts' body during the parasitic phase ofAllothrombium fuliginosum(Hermann) larvae were studied for the first time with light microscopy (LM) and transmission electron microscopy (TEM). The stylostomes were observed in three aphids species-Acyrthosiphon pisum(Harris),Elatobium abietinum(Walker), andMacrosiphum rosae(L.)-parasitized by mites under laboratory conditions. They consisted of 2-6 main branches, preliminarily unbranched, then producing secondary and sometimes also tertiary branches as finally formed structures. Their walls were uniformly electron-dense, without any longitudinal and transverse stratifications and showed rather irregular outlines. Distally, the stylostome branches revealed transparent pores and cavities in their walls, connecting the stylostome canal with surrounding haemocoelic space. The total length of stylostomes at the end of the parasitic phase was on average 16x greater than that recorded in the youngest stylostomes. No differences in the overall shape of feeding tubes between host species were stated. The stylostomes formed in different host species did not differ significantly, except their total length, which attained the highest value in tissues ofAc. pisum.
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