Casiogrammus Wilson, 2005

Álvarez-Rodríguez, Michelle, Riquelme, Francisco, Hernández-Patricio, Miguel & Magaña, Fabio Cupul-, 2024, Diplopoda in the world fossil record, Zoological Systematics 49 (3), pp. 185-245 : 201-202

publication ID

https://doi.org/ 10.11865/zs.2024201

persistent identifier

https://treatment.plazi.org/id/039987E3-FF96-FFA6-96A0-F8CA376FF131

treatment provided by

Felipe

scientific name

Casiogrammus Wilson, 2005
status

 

†Genus Casiogrammus Wilson, 2005 View in CoL

(25) † Casiogrammus ichthyeros Wilson, 2005

Casiogrammus icthyeros Wilson, 2005b: 1104 , pl. 1, figs 1–2.

Referred material: Holotype: NMS G.1970.2. Preservation: Impression. Repository: NMS. Locality: UK, South Lanarkshire, Smithy Burn , Hagshaw Hills Inlier. Horizon: Fish Bed Formation , Middle Silurian.

Comments: Preliminarily, Rofle (1980: 550) states that the oldest terrestrial arthropod was a probable myriapod named Archidesmus loganensis from the Middle Silurian Fish Bed Formation. According to Rofle (1980: 550, fig. 4A), A. loganensis resembles a possible juliform with 20 ornate segments. However, as this fossil is fragmented and poorly preserved, its taxonomic identity must be clarified. Almond (1985: 229–230, fig. 1) placed A. loganensis in the Middle Silurian (ca. 438 Ma) before K. obanensis from the Upper Silurian (ca. 408 Ma). But, he claimed that A. loganensis is not a myriapod. It is more like a form of alga. Wilson & Anderson (2004) also concluded that A. loganensis is more of a plant or alga. Wilson (2005b) later described another fragmentary fossil specimen from the Fish Bed Formation: Casiogrammus ichthyeros . According to Wilson (2006), C. ichthyeros belongs to the order Zosterogrammida . In a stratocladogram, Shear & Edgecombe (2010) placed C. ichthyeros in the oldest fossil record of Myriapoda, including other Diplopoda genera: Albadesmus , Cowiedesmus , and Pneumodesmus (Wilson & Anderson, 2004) . Edgecombe (2015) included C. ichthyeros in a summary taxonomic list of Diplopoda. Selden (2019) stated that C. ichthyeros is the oldest known millipede. It is recognized as having a regular series of similar short and broad tergites resembling a Polyzonida. However, Brookfield et al. (2020) raised doubts about the identity and provenance of C. ichthyeros . According to Brookfield et al. (2020), the geologic setting of the Middle Silurian Fish Bed Formation (ca. 430 Ma) is associated with a freshwater environment where fossil fish and aquatic arthropods are typically found. These later authors then concluded that if C. ichthyeros is considered a millipede, it could have come from other strata (associated with terrestrial environment) that must have been about the same age as the Upper Silurian Kerrera Sandstone Formation. Thus, C. ichthyeros must be as old as K. obanensis ( Brookfield et al., 2020) .

NMS

National Museum of Scotland - Natural Sciences

Kingdom

Animalia

Phylum

Arthropoda

Class

Diplopoda

Order

Zosterogrammida

Family

Zosterogrammidae

Loc

Casiogrammus Wilson, 2005

Álvarez-Rodríguez, Michelle, Riquelme, Francisco, Hernández-Patricio, Miguel & Magaña, Fabio Cupul- 2024
2024
Loc

Casiogrammus icthyeros

Wilson 2005: 1104
2005
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