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Classification of Pseudagnostus jackel, 1909 (Trilobita: Agnostina)

Created 16/10/2025

Updated 16/10/2025

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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.

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Field Value
Title Classification of Pseudagnostus jackel, 1909 (Trilobita: Agnostina)
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/bad4ef29-4f84-45be-8afa-bf675d5864f7
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage Australia
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Classification of Pseudagnostus jackel, 1909 (Trilobita: Agnostina)". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/classification-of-pseudagnostus-jackel-1909-trilobita-agnostina