| Innovatiocaris Temporal range: Cambrian Series 2, Stage 3, 518.03 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ | |
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| Holotype of I. maotianshanensis | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Order: | †Radiodonta |
| Genus: | †Innovatiocaris Zeng et al., 2022 |
| Type species | |
| †Innovatiocaris maotianshanensis Zeng et al., 2022 | |
| Other species | |
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Innovatiocaris (meaning "innovation crab") is a genus of radiodont of uncertain family from the early Cambrian Chengjiang Lagerstätte of Yunnan Province, China. The genus contains two named species, I. maotianshanensis, known from a nearly complete young individual measuring up to 15.2 cm (6.0 in) and isolated frontal appendages, and I.? multispiniformis, known from a complete frontal appendage.
Discovery and naming
Innovatiocaris maotianshanensis
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Life restoration
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Size diagram
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Frontal appendage
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Outdated reconstruction of "Anomalocaris saron", chimerically reconstructed after body of I. maotianshanensis and frontal appendage of Houcaris saron
The holotype specimen of Innovatiocaris maotianshanensis, ELRC 20001 was long considered in scientific literature as "Anomalocaris sp". or Anomalocaris saron (=Houcaris saron). However, in 2022, Zeng et al. described it as a new genus and species of radiodont. The holotype consists of the nearly complete remains of a young individual, preserved on a part and counterpart. A brief description of the specimen was provided in Chen et al. (1994); despite its popularity in popular science literature, however, it did not receive a detailed description until 2022. ELRC 20011 and 20012, additional specimens collected in 1990, consist of isolated frontal appendages. These were designated as paratypes. The specimens were collected from the Maotianshan Shale of the Yu'anshan Formation of Maotianshan, Chengjiang, Yunnan Province, China. The generic name, "Innovatiocaris", is derived from the Latin words "innovatio", meaning "innovation" (honoring the 'innovative spirits" of Junyuan Chen, a scientist who contributed to research of the Chengjiang Lagerstätte) and "caris", meaning "crab". The specific name, "maotianshanensis", is derived from "Maotianshan", the location where the holotype was discovered.
Innovatiocaris? multispiniformis
NIGP 177621, the holotype of Innovatiocaris.? multispiniformis, was collected from the same locality as the I. maotianshanensis holotype. It consists of a complete frontal appendage. The appendage of I.? multispiniformis consists of 13 distal articulated podomeres, as opposed to the 11 podomeres found in I. maotianshanensis and I.? sp. This may be a unique feature or the result of incomplete preservation. The specific name, "multispiniformis", is derived from the roots "multi", meaning "multiple", and "spiniformis", meaning "spinous", in reference to the multiple spines on the frontal appendages. A 2023 study argued that it forms a monophyletic clade with I.? sp. but not with I. maotianshanensis based on phylogenetic analysis.
Innovatiocaris? sp.
An additional specimen, NIGP 177620, was assigned to Innovatiocaris? sp. by Zeng et al. (2022). It consists of a complete frontal appendage, preserved on a part and counterpart. The specimen was collected from the Maotianshan Shale Member of the Yu'anshan Formation in Jianshan, Haikou, Yunnan Province, China. It likely represents a distinct species from I. maotianshanensis. This is further supported by phylogenetic analysis from a 2023 study which shows that it forms a monophyletic clade with I.? multispiniformis but not with I. maotianshanensis.
Classification
Some of its features seem to indicate an affinity with the Hurdiidae, though it is more similar to non-hurdiids than to members of the Hurdiidae. The results of two different phylogenetic analyses by Zeng et al. (2022) are displayed in the cladograms below:
Topology 1: Strict consensus tree
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Topology 2: 50% majority-rule consensus tree
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References
- ^ Zeng, Han; Zhao, Fangchen; Zhu, Maoyan (2022-09-07). "Innovatiocaris, a complete radiodont from the early Cambrian Chengjiang Lagerstätte and its implications for the phylogeny of Radiodonta". Journal of the Geological Society. 180. doi:10.1144/jgs2021-164. ISSN 0016-7649. S2CID 252147346.
- Chen, Jun-yuan; Ramsköld, Lars; Zhou, Gui-qing (1994-05-27). "Evidence for Monophyly and Arthropod Affinity of Cambrian Giant Predators". Science. 264 (5163): 1304–1308. Bibcode:1994Sci...264.1304C. doi:10.1126/science.264.5163.1304. ISSN 0036-8075. PMID 17780848. S2CID 1913482.
- ^ McCall, Christian (13 December 2023). "A large pelagic lobopodian from the Cambrian Pioche Shale of Nevada". Journal of Paleontology. 97 (5): 1009–1024. doi:10.1017/jpa.2023.63.
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