Scanning electron microscope observations on the multilocular disc-pores and dermal projections of adult female Porphyrophora tritici and P. cynodonti

Abstract

The morphology of the multilocular disc-pores from the anterior part of the body (abdominal segments I-III and all thoracic segments, dorso-venterally) of two species of Porphyrophora (P. tritici and P. cynodontis: Hemiptera: Coccoidea: Margarodidae) were examined using a scanning electron microscope. The multilocular disc-pores of both species have 1 or 2 (rarely 3) rings of evenly or unevenly distributed loculi but the more central rings are almost always incomplete. Each outer ring of the more anterior disc-pores of P. tritici was complete, with 5-13 loculi, and the inner ring had 0-4 unevenly distributed loculi. Each disc-pore of P. cynodontis had a complete outer ring of 6-9 evenly distributed loculi and an inner ring with only 0-1 loculi. A bright central zone is absent in most cases. These two species are similar in that both have a dense network of small, globular projections throughout the derm surface. These observations are discussed in relation to those of light microscope studies.

Scanning electron microscopy of six selected mealybug (Hemiptera: Pseudococcidae) species of Sri Lanka

“…The structure of the waxproducing pores is complicated and can be elucidated better using the SEM. However, only a few studies have reported on the ultrastructure and wax-secretion processes in the family Pseudococcidae (Cox and Pearce, 1983;Kumar et al, 1997;Jansen, 2001;Vahedi and Mahfar, 2010). Cook et al (2000) used the SEM to study crawler sexual dimorphism in species in the scale insect family Eriococcidae.…”

Ultra structural study on different sensory structure and some associated body parts of mango mealy bug, Drosicha mangiferae (G.) by scanning electron microscopy

“…However, still now, ultra-structure of mealy bug mouth parts sensory apparatus have been poorly documented without proper descriptions (Pesson, 1944;Vahedi and Mahfar, 2010). Further, there are only a few references regarding the study on the ultra-structure of wax pores of mealy bug (Vahedi and Mahfar, 2010;Jansen, 2001).…”

“…However, still now, ultra-structure of mealy bug mouth parts sensory apparatus have been poorly documented without proper descriptions (Pesson, 1944;Vahedi and Mahfar, 2010). Further, there are only a few references regarding the study on the ultra-structure of wax pores of mealy bug (Vahedi and Mahfar, 2010;Jansen, 2001). Works so far done on the sensory structure of mealy bug was based on the study of other mealy bugs but there is no published report of sensory structures of mango mealy bug (D. mangiferae) concerned with conclusive detail structural representation.…”

Scanning Electron Microscopy of Ferrisia Malvastra (Mcdaniel) (Hemiptera: Pseudococcidae)

“…In mealybugs, the thin and flexible cuticle cause some difficulties in studying the wax-producing pores and ducts. Several studies were carried out on different species of mealybug ultrastructure (Cox and Pearce, 1983a,b;Tewari et al, 1994;Kumar et al, 1997;Vahedi and Mahfar, 2010;Zhang et al, 2012;Beshr, 2015;Sirisena et al, 2015 ;and Khalifa et al, 2019). Morphology of these dermal wax pores and ducts showed variation among variable species.…”