Globampyx

Globampyx is an extinct genus raphiophorid trilobites. It lived during the later part of the Arenig stage of the Ordovician Period,[1] approximately 478 to 471 million years ago.[1] Species of the genus are known from Canada (southeastern British Columbia), Norway (Svalbard) and Sweden.

Globampyx
Temporal range: Late Arenig
G. trinucleoides
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: †Trilobita
Order: †Asaphida
Family: †Raphiophoridae
Genus: †Globampyx
Fortey, 1975
Species
  • G. trinucleoides Fortey, 1975 (type)
  • G. obtusus (Moberg & Segerberg, 1906) synonym Ampyx obtusus
  • G. linnarssoni (Schmidt, 1894) synonym Ampyx linnarssoni
  • G. sinalae Norford & Ross, 1978

Distribution
  • G. sinalae is known from the Middle Ordovician of Canada (Orthidiella brachiopod zone, Glenogle Shales Formation, North White River Section, British Columbia, 471.8-468.1 Ma)
  • G. trinucleoides is known from the Middle Ordovician of Svalbard (Psephosthenaspis microspinosa small shelly zone, Olenidsletta Member, Valhallfonna Formation, Ny friesland, 471.8-457.5 Ma)

Description

The headshield (or cephalon) of Globampyx is densely covered with very small granules. The central raised area of the cephalon (or glabella) has an inverted flask-shape. It lacks the rapier-like glabellar spine of many other raphiophorids, but only has a tubercle. The thorax has five segments. The short but wide triangular pygidium, with a rather low axis (or rhachis) of up to six indistinct rings that reaches the faint border furrow.[2]

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References
  1. Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Trilobita entry)". Bulletins of American Paleontology. 364: 560. Archived from the original on September 5, 2006. Retrieved 2008-01-12.
  2. Fortey, R.A. (1975). The Ordovician Trilobites of Spitsbergen [II. Asaphidae, Nileidae, Raphiophoridae and Telephinidae of the Valhallfonna Formation]. Norsk Polarinstitutt Skrifter. 162. Oslo: Norsk Polarinstitutt.


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