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Classification of Pseudagnostus jackel, 1909 (Trilobita: Agnostina)

Eighty-eight species assigned or assignable to Pseudagnostus sensu lato are divided into two broad divisions based on the position of the glabellar node with respect to the anterior or anterolateral glabellar furrows and anterolateral lobes. A spectaculate division in which the node lies to the rear of the anterior furrow and to the rear of the anterolateral lobes, is divided into nine species groups which are recognised by degree of effacement of external morphology, shield shape, border morphology, glabellar morphology, pygidial spinosity, and metamerism. Three spectaculate species groups, bulgosus, communis, and cyclopyga, are referred to Pseudagnostus Jaekel, 1909, sensu stricto; one, contracta, to Pseudagnostina Palmer, 1962; and one, securiger, to Sulcatagnostus Kobayashi, 1937, these latter taxa being regarded as subgenera of Pseudagnostus. "Four other spectaculate species groups, araneavelatus, bilobus, oanadensis, and clavus, are classified with Neoagnostus Kobayashi, 1955, pending clarification of the taxonomic status and concepts of Euplethagnostus Lermontova, 1940, and Pseudorhaptagnostus Lermontova, 1940. Hyperagnostus Kobayashi, 1955 and Machairagnostus. Harrington & Leanza, 1957 are synonymised with Neoagnostus. A papilionate division, in which the axialglabellar node lies between the anterolateral lobes and interrupts the course of the anterior furrow, consists of two species groups, convergens and clarki, which are assigned to Rhaptagnostus Whitehouse, 1936. The gneric name Plethagnostus Clark, 1923 is suppressed.

Data and Resources

Additional Info

Field Value
Title Classification of Pseudagnostus jackel, 1909 (Trilobita: Agnostina)
Type Dataset
Language English
Licence Creative Commons Attribution 4.0 International
Data Status inactive
Update Frequency unknown
Landing Page http://data.gov.au/dataset/23664b68-e493-4751-969e-1e55cec78625
Date Published 2017-03-03
Date Updated 2017-03-03
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Jurisdiction Commonwealth of Australia
Data Portal Geoscience Australia CSW Harvester
Publisher/Agency Geoscience Australia
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