Thin section of Archaediscus, from BouDagher-Fadel (2008).

Belongs within: Fusulinida.

The Archaediscidae are a group of fusulinid Foraminifera known from the Lower Carboniferous to the Permian. The test is streptospirally coiled in early stages in the genus Archaediscus, becoming nearly planispiral in later stages. Other genera are planispirally coiled for the greater part of (Brunsia) or throughout (Permodiscus) the test (Loeblich & Tappan 1964a).

Characters (from Loeblich & Tappan 1964a): Proloculus followed by tubular second chamber, involute in early stage, later streptospirally or planispirally coiled; outer wall layer of radial calcite, inner layer finely granular; aperture at end of spiral chamber.

<==Archaediscidae [Archaediscinae]
    |--Angulodiscus Kristan 1957 W76
    |    `--*A. communis Kristan 1957 [=Aulotortus communis] LT64b
    |--Multidiscus Miklukho-Maclay 1953 W76
    |    |--*M. padangensis (Lange 1925) [=Nummulostegina padangensis, Permodiscus padangensis] LT64a
    |    `--M. semiconcavus Wang 1976 W76
    |--Neodiscus Miklukho-Maclay 1953 W76
    |    |--*N. milliloides Miklukho-Maklay 1953 [=Archaediscus milliloides] LT64a
    |    `--N. qinglongensis Wang 1976 W76
    |--Permodiscus Dutkevich in Chernysheva 1948 [incl. Lensarchaediscus Porchinjakova in Miklukho-Maklay 1957] LT64a
    |    |--*P. vetustus Dutkevich in Chernysheva 1948 LT64a
    |    `--P. ovalis (Porchinjakova in Miklukho-Maklay 1957) [=*Lensarchaediscus ovalis] LT64a
    |--Brunsia Mikhaylov 1939 (see below for synonymy) LT64a
    |    |--*B. irregularis (von Möller 1879) [=Spirillina irregularis] LT64a
    |    |--B. incerta (Grozdilova & Lebedeva 1954) [=Archaediscus incertus, *Neoarchaediscus incertus] LT64a
    |    |--‘Planoarchaediscus’ karreri R79
    |    |--B. pamirensis (Miklukho-Maklay 1960) [=*Quasiarchaediscus pamirensis] LT64a
    |    |--B. plana (Miklukho-Maklay 1957) [=*Hemiarchaediscus planus] LT64a
    |    |--B. pulchra LT64a
    |    `--B. spirillinoides (Rauzer-Chernousova 1948) (see below for synonymy) LT64a
    |--Agathammina Neumayr 1887 W76
    |    |--*A. pusilla (Geinitz in Geinitz & Gutbier 1848) [=Serpula pusilla] LT64a
    |    `--A. ovata Wang 1976 W76
    `--Archaediscus Brady 1873 W76 (see below for synonymy)
         |--*A. karreri Brady 1873 [=*Archaediscoum karreri] LT64a
         |--A. akchimensis Grozdilova & Lebedeva 1954 [=*Rugosoarchaediscus akchimensis] LT64a
         |--A. bashkiricus Krestovnikov & Teodorovitch 1936 [=*Asteroarchaediscus bashkiricus] LT64a
         |--A. chernoussovensis CM01
         |--A. convexus CM01
         |--A. dubitabilis (Orlova 1955) [=*Paraarchaediscus dubitabilis] LT64a
         |--A. koktjubensis CM01
         |--A. krestovnikovi CM01
         |--A. latispiralis R79
         |--A. mellitus ZP86
         |--A. moelleri CM01
         |--A. pseudomoelleri CM01
         `--A. ulmeri (Mikhaylov 1939) [=Hemigordius ulmeri, *Propermodiscus ulmeri] LT64a

Archaediscus Brady 1873 W76 [=Archaediscoum Rhumbler 1913 LT64a; incl. Asteroarchaediscus Miklukho-Maklay in Kiparisova et al. 1956 LT64a, Paraarchaediscus Orlova 1955 LT64a, Propermodiscus Miklukho-Maklay 1953 LT64a, Rugosoarchaediscus Miklukho-Maklay 1957 LT64a]

Brunsia Mikhaylov 1939 [incl. Hemiarchaediscus Miklukho-Maklay 1957, Neoarchaediscus Miklukho-Maklay in Kiparisova et al. 1956, Planoarchaediscus Miklukho-Maklay in Kiparisova, Markovskii & Radchenko 1956, Quasiarchaediscus Miklukho-Maklay 1960] LT64a

Brunsia spirillinoides (Rauzer-Chernousova 1948) [=Archaediscus spirillinoides, *Planoarchaediscus spirillinoides] LT64a

*Type species of generic name indicated


[CM01] Cózar, P., & B. L. Mamet. 2001. Planohowchinia (Lasiodiscidae, Foraminiferida), a new Late Viséan genus, southwestern Spain. Journal of Foraminiferal Research 31 (3): 228–232.

[LT64a] Loeblich, A. R., Jr & H. Tappan. 1964a. Sarcodina: chiefly “thecamoebians” and Foraminiferida. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt C. Protista 2 vol. 1. The Geological Society of America and The University of Kansas Press.

[LT64b] Loeblich, A. R., Jr & H. Tappan. 1964b. Sarcodina: chiefly “thecamoebians” and Foraminiferida. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt C. Protista 2 vol. 2. The Geological Society of America and The University of Kansas Press.

[R79] Ross, C. A. 1979. Carboniferous. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A254–A290. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[W76] Wang K. 1976. The foraminifera from the Changhsing Formation in western Guizhou. Acta Palaeontologica Sinica 15 (2): 187–195.

[ZP86] Zhang, R., & J. Pojeta Jr. 1986. New bivalves from the Datang Stage, Lower Carboniferous, Guangdong Province, China. Journal of Paleontology 60 (3): 669–679.

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