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The Illaenid Pygidium

With special reference to the reflexed border

Published online by Cambridge University Press:  01 May 2009

J. L. Begg
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Extract

With the removal of certain genera the Illaenidae has become a very homogeneous family. Attempts have been made to group genera into subfamilies, the most important of which was that made by Salter in 1867, but these efforts have not met with general approval. Thus Warburg (1925, pp. 97–100) has given a recent summary of the Illaenid classification and discussed the previous literature, and this author endorses the opinion expressed by Raymond in 1916, “that it is still too early to make any natural classification.” Whittard (1938, p. 89) follows Holm and Warburg and meantime would only admit Illaenus and Bumastus as valid genera and suggests that Salter’s genus Ectillaenus might be retained for species of Illaenids in which visual organs were either absent or vestigial.

Type
Articles
Information
Geological Magazine , Volume 82 , Issue 3 , June 1945 , pp. 107 - 113
Copyright
Copyright © Cambridge University Press 1945

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References

REFERENCES

Holm, G., 1886. Die ostbaltischen Illaeniden in Fr. Schmidt Revision der Ostbaltischen Silurischen Trilobiten. Abteilung III, Mém. Acad. Imp. Sci., St. Pétersbourg. sér. vii, xxxiii, No. 8.Google Scholar
Raymond, P. E., 1916. New and old Silurian Trilobites from south-eastern Wisconsin, with notes on the Illaenidae. Bull. Mus. Comp. Zool., Harvard, lx.Google Scholar
Reed, F. R. C., 1944. Five new Ordovician Trilobites. Geol. Mag., lxxxi, No. 2.Google Scholar
Salter, J. W., 1867. Monograph of British Silurian Trilobites, pt. 4. Palaeont. Soc.Google Scholar
Warburg, E., 1925. The Trilobites of the Leptaena Limestone in Dalarne. Bull. Geol. Inst. Upsala, xvii.Google Scholar
Whittard, W. F., 1940. The Ordovician Trilobite Fauna of the Shelve-Cordon District, West Shropshire, part ii, Ann. Mag. Nat. Hist., ser. 11, vi, p. 142.Google Scholar