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<mecopter.htm> [For educational
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MECOPTERA, (Comstock 1895).-- <Images>
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Classification] Please refer also to the following links for details on this
group: Mecoptera = Photos-1, Photos-2 Description & Statistics
Mecoptera, or "scorpion flies,"occur in shaded habitats
and areas of dense vegetation where the soil is moist. The larvae are eruciform and are found on
or in the soil in rather damp places.
Adults and larvae of many species are predaceous, but some species are
also saprophagous. Larvae of Panorpa
feed on dead or dying insects and rarely if ever on active living forms. Bittacus is essentially predaceous
on such insects and other small animals that occur in or on the moist soil
(Clausen 1940/1962). They are thought
to have little importance to biological control. In the order Mecoptera there were 25 genera and more
than 409 species known as of 2000.
They are mainly tropical and temperate insects. Diagnostic characters include a head that
is prolonged downward in the shape of a beak or rostrum; the antennae are
long and filiform; and the fore and hind wings are of almost equal size. They have three ocelli, which are quite
large and well developed; the legs are long, lean, and the body is generally
small. Mecoptera
are primarily predators or consumers of dead organisms, early ones might have
played an important role before the evolution of other insects in pollinating
extinct gymnosperms.
All species are small to medium sized with slender, elongated, bodies.
They have simple mouthparts, with long mandibles and fleshy palps, which
resemble those of the more primitive true flies. Like many other insects,
they possess compound eyes on the side of the head, and three ocelli on the
top. Most species feed on vegetation in moist environments; in hotter
climates, they may therefore be active only for short periods of the year. The
wings are narrow, with many cross-veins, and they resemble those of primitive
insects such as mayflies. A few genera, however, have reduced wings, or have
lost them altogether. The abdomen is cylindrical, and typically curves
upwards in the male, superficially resembling the tail of a scorpion. The
female lays the eggs in moist areas, and then the eggs absorb water and
increase in size after deposition. In species that live in hot conditions,
the eggs may not hatch for several months, the larvae only emerging when the
dry season has finished. More typically, however, they hatch after a
relatively short period of time. The
larvae are resemble caterpillars, with short, clawed, true legs, and a number
of abdominal prolegs. They have a sclerotised head with compound eyes and
mandibulate mouthparts. The tenth abdominal segment bears either a suction disc,
or, less commonly, a pair of hooks. They generally eat vegetation or scavenge
for dead insects, although some predatory larvae are known. The larvae crawl into the soil or decaying
wood to pupate, and o not spin a cocoon. The pupae are exarate, with the
limbs free of the body, and are they able to move their mandibles, but are
otherwise they are entirely non-motile. In drier habitats, they may remain
for a few months in diapause, before emerging as adults once the conditions
are optimum. References: Please refer to <biology.ref.htm>, [Additional references
may be found at: MELVYL Library] Archibald, S.B. (2005). "New
Dinopanorpida (Insecta: Mecoptera) from the Eocene Okanogan Highlands
(British Columbia, Canada and Washington State, USA)". Canadian
Journal of Earth Sciences 4 (2): 119–136. Byers, G. 1963. Ann. Ent. Soc.
Amer. 56: 142-9. Byers, G. 1965. Pacific Ins.
7: 705-48. Carpenter, F. M. 1931.
Bull. Mus. Comp. Zool., Harvard Univ. 72: 205-77. Carpenter,
F. M. Psyche 38: 41-55. Grimaldi, D. and Engel, M.S. (2005). Evolution
of the Insects. Cambridge University Press. Hoell, H.V., Doyen, J.T. & Purcell, A.H.
(1998). Introduction to Insect Biology and Diversity, 2nd ed.. Oxford
University Press. pp. 488–491. Ollerton
J. Coulthard E. (2009). Evolution of Animal Pollination. Science, 326:
808-809. Ren D, Labandeira
CC, Santiago-Blay JA, Rasnitsyn A, Shih CK, Bashkuev A, Logan MA, Hotton CL,
Dilcher D. (2009). Probable Pollination Mode Before Angiosperms: Eurasian,
Long-Proboscid Scorpionflies. Science, 326 (5954), 840-847. Whiting, Michael F. (2002). "Mecoptera
is paraphyletic: multiple genes and phylogeny of Mecoptera and Siphonaptera".
Zoologica Scripta 31 (1): 93–104. |