Specimen and cross-section of Armenoceras arcticum, from Teichert (1964).

Belongs within: Actinocerida.

Armenoceras was a genus of actinocerid cephalopods that lived from the Middle Ordovician to the Upper Silurian.

Characters (from Teichert 1964): Medium-sized to large straight shell. Siphuncle off-centre, large; adnation areas broad; septal necks very short, brims wide and in contact with posterior surface of septa; endosiphuncular canals well developed, commonly complex. Cameral deposits rare.

<==Armenoceras Foerste 1924 (see below for synonymy) T64
    |--*A. hearsti (Parks 1913) [=Actinoceras hearsti] T64
    |--A. arcticum T64
    |--A. asiaticum Endo 1932 P68
    |--A. bassleri Endo 1932 P68
    |--A. brevicameratum Foerste & Teichert 1930 P68
    |--A. coulingi P68
    |--A. elegans Endo 1932 P68
    |--A. elongatum Endo 1932 P68
    |--A. gasconense Foerste 1936 P68
    |--A. haroi P68
    |--A. hatai Endo 1932 P68
    |--A. hayasakai Endo 1932 P68
    |--A. kidoi Endo 1932 P68
    |--A. madisonense Foerste & Teichert 1930 P68
    |--A. manchuriense P68
    |--A. murakanmii P68
    |--A. nanum P68
    |    |--A. n. nanum P68
    |    `--A. n. takayamai Endo 1932 P68
    |--A. nudum Endo 1932 P68
    |--A. numatai Endo 1932 P68
    |--A. orientale Endo 1932 P68
    |--A. penhsiense Endo 1932 P68
    |--A. resseri Endo 1932 P68
    |--A. richardsoni T64
    |--A. richthofeni P68
    |--A. shimizui Endo 1930 P68
    |--A. sondai Endo 1932 P68
    |--A. suzukii Endo 1932 P68
    |--A. tani P68
    |--A. teicherti Endo 1932 P68
    `--A. yabei Endo 1932 P68

Armenoceras Foerste 1924 [incl. Eushantungoceras Shimizu & Obata 1935, Helenites Zhuravleva 1962, Kokujoceras Balashov 1962, Linormoceras Kobayashi & Matumoto 1942, Neowutinoceras Shimizu & Obata 1935, Shantungoceras Shimizu & Obata 1936, Tunguskoceras Zhuravleva 1957, Yabeites Endo 1934] T64

*Type species of generic name indicated


[P68] Purnell, L. R. 1968. Catalog of the Type Specimens of Invertebrate Fossils. Part I: Paleozoic Cephalopoda. United States National Museum Bulletin 262: 1-198.

[T64] Teichert, C. 1964. Actinoceratoidea. In Treatise on Invertebrate Paleontology pt. K. Mollusca 3. Cephalopoda – General Features – Endoceratoidea – Actinoceratoidea – Nautiloidea – Bactritoidea (R. C. Moore, ed.) pp. K190-K216. The Geological Society of America and the University of Kansas Press.

No comments:

Post a Comment

Markup Key:
- <b>bold</b> = bold
- <i>italic</i> = italic
- <a href="">FoS</a> = FoS