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The Grylloblattodea or Ice Bugs (sometimes called Rock Crawlers) are an small order of ancient and primitive insects first discovered by E.M.Walker in the Canadian Rockies in 1914, since then about 25 species have been described some from Japan, Korea, China and North America and one from Russia but always from mountainous habitats 1500 to 6500 ft. Evolutionarily speaking they seem to represent a step between the Cockroaches (Dictyoptera) and the Grasshoppers and Crickets (Orthoptera), hence their scientific name a mix of 'Gryllo' and 'Blatta' . The habitats they live in now are of little interest to other insects, thus they avoid competition with more modern insects, they have been described as 'living fossils'. They are the smallest extant order of insects, i.e. there are less species in the order than in any other order.
They are hemimetabolous (i.e. they do not have a proper metamorphosis and the young look just like small adults except they have no eyes (Galloisiana notabilis) or greatly reduced compound eyes and no ocelli (Grylloblatta campodeiformis). Their mouthparts are adapted to biting and chewing, their antennae are are filiform (long and thin) with 28 to more than 40 segments. The legs are all approximately equal, have large coxae and 5 tarsal segments. The female has a well developed ovipositor and both sexes have long, 8 segmented cerci. Adults are apterous (wingless) 2 to 3.5 cm (0.7 to 1.5 of an inch) long.
The eggs are black and layed singly into the soil or moss. The eggs hatch after anything from a few months to 3 years and the young go through about about 8 nymphal instars and take up to 7 years to reach maturity. They adults are normally considered to be nocturnal but some species have been reported as being active throughout the day as well. They are predaceous or omnivorous feeding on nother insects, and dead animal and plant matter, hiding beneath stones during the day, they seem to prefer low temperatures of around 4C, which explains the long time it takes them to mature. Adults live for at least 1 year and females lay when they are about a year old. In Korea they have also been found in caves.
There are only about 25 named species divided between 4 genera, one from each of their 3 known locations, the Grylloblatta which contains 11 species from North America, the Galloisiana containing 10 species from Japan Korea and China, the Grylloblattella containing 3 species from Siberia, China and Korea, and the Grylloblattina containg only 1 species G. djakonovi from Siberia.
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Grylloblattodea on the Web
Gryllobattodea An Introduction
Grylloblattodea at the Tree of Life
New triassic Grylloblattids from Kirghizia (Insecta, Grylloblattida).
SPIXIANA 1994 vol. 17, no. 1, pp. 27-35
Fine structure of the rectal pads in Grylloblatta compodeiformis (Walker) (Orthoptera: Grylloblattidae) with
reference to fluid transport.
INT. J. INSECT MORPHOL. EMBRYOL. 1993 vol. 22, no. 1, pp. 25-40
Permian Tiliyardembiidae (Insecta, Grylloblattida)
Vilesov A. P. and Novokshonov V. G.
Paleontologicheskii Zhurnal, 1993, No.3, p.56
Permian fossil insects of North-East Europe - New and little-known Ideliidae (Insecta, Plecopteroidea, Grylloblattida)
Entomologica Fennica, 1992, Vol.3, No.1, pp.21-39
A new family of Triassic Grylloblattids from central Asia (Insecta, Grylloblattida).
Storozhenko, S. SPIXIANA. 1992 vol. 15, no.1, pp. 67-73
Permian fossil insects of North-East Europe - New Liomopterids (Grylloblattida, Liomopteridae and Phenopteridae)
Deutsche Entomologische Zeitschrift, 1992, Vol.39, No.1-3, pp.209-220
Postembryonic development and homology of external genitalia in Galloisiana nipponensis (Caudell et King)
INT. J. INSECT MORPHOL. EMBRYOL. 1991 vol. 20, no. 3, pp. 157-168
New fossil Grylloblattida insects (Insecta, Grylloblattida - Blattogryllidae, Geinitziidae) from permian and mesozoic periods of Asia
Storozhenko S. Y.
Paleontologicheskii Zhurnal, 1990, No.4, pp.57-65
Fine-structure of malpighian tubules Grylloblatta compodeiformis (Orthoptera, Grylloblattidae)
Jarial M. S.
Transactions of the American Microscopical Society, 1990, Vol.109, No.4, pp.329-341
Galloisiana sofiae sp. n., a new species of Grylloblattodea from Northern Korea.
POL. PISMO ENTOMOL.1987 vol. 57, no. 2, pp. 257-262
A new species of Grylloblattida from north-eastern Altai.
Storozhenko, S.Yu. and Oliger, A.I.
ENTOMOL. OBOZR. 1984 vol. 63, no. 4, pp. 729-732
Biology of the Notoptera.
Ando, H. (ed.) 1982
KASHIYO-INSATSU CO., LTD.; NAGANO (JAPAN); 194 pp
Sensory receptors on the mandibles and labrum of Grylloblatta campodeiformis Walker.
ZOOL. ANZ. 1982 vol. 209, no. 5-6, pp. 341-344
Notulae Orthopterologicae. XXXVIII. A new assessment of the male genital organs of the Grylloblattodea.
MEM. SOC. ENTOMOL. ITAL. 1981 vol. 60, no. 2, pp. 49-60
Taxonomy, distribution, and zoogeographic evolution of Grylloblatta in Canada (Insecta: Notoptera) (Grylloblatt.,
Kamp, J. W.
Can. Entomol.,1979 Vol. 111(1), 27-38;
Fine structure of oocyte and follicular cells during oogenesis in Galloisiana nipponensis (Caudell and King) (Grylloblattodea: Grylloblattidae)
Matsuzaki, M. Ando, H. and Visscher, S.N.
Int. J. Insect. Morphol. Embryol., 1979 Vol. 8(5-6), 257-263
Neural function in an alpine grylloblattid: a comparison with the house cricket, Acheta domesticus.
Morrissey, R. and Edwards, J. S.
Physiol. Entomol., 1979 Vol. 4(3), 241-250
Numerical classification of the orthopteroids, with special reference to the Grylloblattodea. Can.
Kamp, J. W.
Ent., 1973. 105: 1235-1249.
The taxonomy and distribution of the Grylloblattidae.
Proc. Ent. Soc. Wash., 1948. 50: 86-102.
Grylloblatta, a living fossil.
Walker, E. M.
Tran. R. Soc. Can., 1937. 31: 1-10.
On the behavior of Grylloblatta.
Can. Ent., 1926. 58: 66-70.
A new species of Orthoptera forming a new genus and family.
Walker, E. M.
Can. Ent., 1914. 46: 93-99.
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