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XXIII.—On the Genus Anaspides and its Affinities with certain Fossil Crustacea

Published online by Cambridge University Press:  06 July 2012

W. T. Calman
W. T. Calman
Affiliation:
University College, Dundee.
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Extract

The genus Anaspides was founded in 1894 by Mr G. M. Thomson of Dunedin, New Zealand, for the reception of a very remarkable Schizopod Crustacean which he had discovered in a fresh-water pool at an altitude of 4000 feet on Mount Wellington in Tasmania. The very striking peculiarities of the animal, the absence of a carapace, the presence of plate-like gills attached to the bases of the thoracic legs, and the possession of an auditory organ in the peduncle of the antennules, led its discoverer to regard it as the type of a new family of Schizopods, the Anaspidæ, while suggesting that it might be entitled to “even higher specific rank.” I have had an opportunity of examining three specimens of Anaspides presented to the Museum of University College, Dundee, by Dr Chas. Chilton of New Zealand, and from the dissection of one of these I have been able to supplement, in some important points, Mr Thomson's account of the external anatomy of the animal. I wish also to call attention to the remarkable resemblance, indicative I believe of close affinity, which Anaspides bears to certain Palaeozoic Crustacea belonging to a group hitherto supposed to be unrepresented among living forms. The present paper has been prepared under the direction of Prof. D'Arcy W. Thompson.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 38 , Issue 4 , 1897 , pp. 787 - 802
Copyright
Copyright © Royal Society of Edinburgh 1897

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References

page 787 note * Trans. Linn. Soc. Zool. (2), vi. 3. A preliminary account, without figures, was published in Proc. Roy. Soc. Tasmania, 1892.

page 788 note * This suggestion deals with the morphology of the carapace only in so far that it leaves out of account the many complex issues that might arise from a full consideration of the various minor grooves, other than the main cervical one, which are described by Boas (Decap. Slaegtskab., Vidensk. Selsk. Skr., 1880) as present on the carapace of various Decapods.

page 789 note * “…dass schon zu einer Zeit, in welcher die Edriophthalmen- und Podophthalmenzweige noch nicht gesondert waren, vor dem Gehirn eih bläschenförmiges Sinnesorgan gelegen war, auf welches wir daa Gehörorgan von Decapoden und Oxycephaliden zurückzuführen hätten.”—Claus, Crustaceen-System, p. 27.

page 790 note * Stud. il. d. Venwandschaftsbeziehungen d. Malakostrahen. Morph. Jahrb., viii., 1882Google Scholar.

page 790 note † Challenger Rep., “Schizopoda,” p. 153.

page 790 note ‡ Neue Beiträge z. Morph. d. Crust. Arb. a. d. Zool. Inst. Wien, vi., 1886, p. 15Google Scholar.

page 790 note § Dijmphna Togtet Krebsdyr, pp. 69–71. Resumé, p. 22.

page 791 note * Hansen, Dijmphna Togtet Krebsdyr, p. 70.

page 792 note * Neue Beitr. Morph. d. Crust., Arh. Zool Inst. Wien, vi., 1886, pp. 42–45Google Scholar.

page 793 note * Op. cit., p. 34.

page 793 note † The resemblance of the gill plates of Anaspides to those of Amphipoda is mentioned by Mr Thomson in his preliminary paper, l.c.

page 793 note ‡ Zool. Anz., xvi., 1893, p. 193Google Scholar.

page 795 note * Challenger Rep., Schizopoda.

page 795 note † Morph. Jahrb., viii., 1882Google Scholar.

page 795 note ‡ Zool. Anz., xvi., 1893, pp. 202–5Google Scholar.

page 795 note § Plankton Exp., Decapoden u, Schizopoden.

page 795 note ∥ Bronn's Klassen u. Ordn. d. Thierreichs, Arthropoda.

page 796 note * Proc. Acad. Nat. Sc. Philadelphia, 1865; also, Rep. Geol. Survey, Illinois, iii., 1868Google Scholar.

page 796 note † Mem. Nat. Acad. Sci. Washington, iii. (2), 1886Google Scholar. A preliminary abstract in Amer. Naturalist, xix., pp. 790–792, 1885.Google Scholar

page 796 note ‡ Proc. Boston Soc. Nat. Hist., xxiv., pp. 211–213, 1889Google Scholar.

page 798 note * The Palæocaris scoticus of Peach (Trans. Roy. Soc. Edin., xxx., p. 85, pl. x. 3) differs very markedly from the American form in the arrangement of grooves on the head-region. It may possibly represent a distinct genus.

page 798 note † These strata are now referred by some authorities to the Dyas.

page 798 note ‡ Ueber d. Steinkohlenformation von Saarbrücken. Palæontographica, iv., 1856Google Scholar.

page 798 note § Jordan and v. Meyer remark that this segment varies slightly in length in different specimens.

page 799 note * “Ueberdiess erkennt man dass an der Wurzel der vordern sieben oder acht Füsse noch besondere Anhängsel vorhanden waren, und zwar von namhafter Länge und Stärke.”—Jordan and v. Meyer, op. cit.

page 801 note * Apparently, however, Packard's views on this point have been somewhat modified, for in the 5th edition of his text-book of Zoology, published in the same year (1886) as the papers above referred to he uses the term Syncarida as including all the genera above named.

page 801 note † “Anniversary Address,” Proc. Geol. Soc., lii., 1896Google Scholar.