Atypical 'fibrillar' flight muscle in strepsiptera.

Abstract:

:The fine structure of the principal and ancillary metathoracic flight muscle fibres in the adult male of a strepsipteran, Elenchus tenuicornis, is described. Power-producing dorsal longitudinal and dorso-ventral flight muscles show features consistent with myoneural asynchrony: myofibrils are large and discrete and are separated by large closely packed mitochondria; the sarcoplasmic reticulum is very reduced but engages with T-system membranes in dyads at the mid-sarcomere H-band level. With respect to other asynchronous insect flight muscles, the fibres of Elenchus are anomalous (i) in the small fibre diameter, (ii) in the variable contour of the myofibrils and (iii) in the absence of tracheolar invagination. The functional significance of these structural features is discussed. Ancillary metathoracic muscles are structurally comparable with other synchronous fibres in possessing an extensive SR compartment. Structural evidence for asynchrony in the flight mechanism of Strepsiptera is considered in the context of the evolution of this mechanism throughout the insect Orders.

journal_name

Tissue Cell

journal_title

Tissue & cell

authors

Smith DS,Kathirithamby J

doi

10.1016/0040-8166(84)90072-7

subject

Has Abstract

pub_date

1984-01-01 00:00:00

pages

929-40

issue

6

eissn

0040-8166

issn

1532-3072

journal_volume

16

pub_type

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