Topic
Digonus
About: Digonus is a research topic. Over the lifetime, 3 publications have been published within this topic receiving 41 citations.
Papers
TL;DR: Sandford et al. as mentioned in this paper described a new genus Wenndorfia and two new subgenera Trimerus (Ramiotis) and T. (Edgillia) from the Silurian and Lower Devonian of south-eastern Australia and New Zealand (Arthropoda: Trilobita: Homalonotidae).
Abstract: Sandford, A.C. 2005. Homalonotid trilobites from the Silurian and Lower Devonian of south-eastern Australia and New Zealand (Arthropoda: Trilobita: Homalonotidae). Memoirs of Museum Victoria 62(1): 1–66. Trilobites belonging to the Homalonotidae are well represented in the Silurian and Early Devonian of south-eastern Australia and New Zealand, and are a significant component of the family world-wide. Their description provides an opportunity to review relationships between species and higher order taxa. A new genus Wenndorfia and two new subgenera Trimerus (Ramiotis) and T. (Edgillia) are described, and revised diagnoses are given for Trimerus, Homalonotus, Dipleura, Digonus and Parahomalonotus. Species described or redescribed from central Victoria include Homalonotus williamsi sp. nov., H. talenti sp. nov., Dipleura garratti sp. nov., Digonus wenndorfi sp. nov., Trimerus (Trimerus) vomer (Chapman, 1912), T. (T.) harrisoni (McCoy, 1876), T. (Edgillia) kinglakensis (Gill, 1949), T. (E.) jelli sp. nov., T. (Ramiotis) rickardsi sp. nov., T. (R.) tomczykowa sp. nov., T. (R.) otisi sp. nov., T. (R.) thomasi sp. nov. and Wenndorfia lilydalensis (Gill, 1949). Tasmanian species described include T. (R.) iani sp. nov., Brongniartella? sp. and D. zeehanensis (Gill, 1949). Wenndorfia expansa (Hector, 1876) (= H. (Burmeisteria) huttoni Allan, 1935, = D. margaritifer Wenndorf, 1990) from New Zealand is redescribed. Complex relationships between trilobite faunal composition and taphonomy demonstrate that homalonotid assemblages are inadequately described by the biofacies concept. A recurrent relationship can be recognised between homalonotid-dominated low diversity assemblages and high diversity assemblages in relatively shallower-water facies in which homalonotids are minor faunal elements. These paired assemblages occur variously along a bathymetric gradient that reflects specific environmental tolerances, and precludes the definition of discrete assemblage-facies associations.
22 citations
Journal Article•
TL;DR: Five genera of the subfamily Homalonotinae from the Upper Ludlovian, Upper Gedinnian and Lower Siegenian of Poland are described, and taxonomic criteria of this subfamily are discussed, along with its outline phylogeny.
Abstract: Twelve species of trilobites, including six new ones (Dipleura praecox sp. n., Trimerus lobatus sp. n., T. novus sp. n., Digonus bostoviensis sp. n., D. elegans sp. n., and Parahomalonotus angusticostatus sp. n.), assigned to five genera of the subfamily Homalonotinae from the Upper Ludlovian, Upper Gedinnian and Lower Siegenian of Poland are described below. Taxonomic criteria of this subfamily are discussed, along with its outline phylogeny.
Journal Article•
TL;DR: Burmeisteria (Digonus) accraensis, n. sp., occurs in a Devonian clay shale that crops out on the west African coast at Accra, Ghana as mentioned in this paper.
Abstract: Burmeisteria (Digonus) accraensis, n. sp., occurs in a Devonian clay shale that crops out on the west African coast at Accra, Ghana. The species has been previously called Trimerus (Dipleura) dekayi Green, a species from the middle Devonian of New York State, but a study of 175 holaspid specimens and five meraspid specimens shows that an assignment to Burmeisteria (Digonus) Guerich, 1909 is greatly preferable and that the species is new.
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2005 | 1 |
| 1975 | 1 |
| 1967 | 1 |