Dr Imran Rahman

Deputy Head of Research

Dr Rahman’s research uses echinoderms as a model group for uncovering the origin and early evolution of animals more broadly. His work is focused on Palaeozoic fossils, which document the earliest steps in the evolution of the echinoderm body plan. Fossils are analysed with the aid of high-resolution X-ray tomography and computer simulations (e.g. computational fluid dynamics), providing new insights into their morphology, systematics and function. This has informed rigorous tests of long-standing hypotheses concerning the mode of life, phylogenetic relationships and evolutionary history of early echinoderms, with implications for understanding the Cambrian explosion and the emergence of animals more generally.

Related research interests include Ediacaran organisms and their ecosystems, the anatomy and development of deuterostomes and techniques for three-dimensional visualization and analysis of fossil and modern specimens.

Computer simulation of water flow around Protocinctus mansillaensis, a fossil echinoderm from the Cambrian of Spain, Rahman et al. 2015

Three-dimensional computer reconstruction of Heropyrgus disterminus, a fossil echinoderm from the Silurian of Herefordshire, UK, Briggs et al. 2017

Imran Rahman is Deputy Head of Research at Oxford University Museum of Natural History, and is currently supported by a Museum Research Fellowship. He is also a Junior Research Fellow at St Cross College. Prior to this, Imran was supported by an 1851 Research Fellowship split between the University of Bristol and the Oxford University Museum of Natural History.

Imran obtained an MSc in Palaeobiology from University College London and a PhD on Palaeozoic fossil echinoderms from Imperial College London under the supervision of Dr Mark Sutton. After his PhD, Imran undertook an MSc in Evolutionary Genetics and Genomics at the University of Manchester to gain practical experience in molecular biology and bioinformatics. This was followed by a NERC Postdoctoral Research Fellowship split between the Universities of Birmingham and Bristol.

Featured publications

Computational fluid dynamics suggests ecological diversification among stem-gnathostomes

Ferrón, HG, Martínez-Pérez, C, RAHMAN, IA, Selles de Lucas, V, Botella, H, Donoghue, PCJ

October 2020
|
Journal article
|
Current Biology
Evolution and development at the origin of a phylum

Deline, B, Thompson, JR, Smith, NS, Zamora, S, RAHMAN, IA, Sheffield, SL, Ausich, WI, Kammer, TW, Sumrall, CD

May 2020
|
Journal article
|
Current Biology
Re-evaluating the phylogenetic position of the enigmatic early Cambrian deuterostome Yanjiahella

Zamora, S, Wright, DF, Mooi, R, Lefebvre, B, Guensburg, TE, Gorzelak, P, Sumrall, CD, Cole, SR, Hunter, AW, Sprinkle, JT, Thompson, JR, Ewin, TAM
,
et al

March 2020
|
Journal article
|
Nature Communications
Gregarious suspension feeding in a modular Ediacaran organism.

Gibson, BM, Rahman, IA, Maloney, KM, Racicot, RA, Mocke, H, Laflamme, M, Darroch, SAF

June 2019
|
Journal article
|
Science advances

Reconstructing Precambrian eukaryotic paleoecology is pivotal to understanding the origins of the modern, animal-dominated biosphere. Here, we combine new fossil data from southern Namibia with computational fluid dynamics (CFD) to test between competing feeding models for the Ediacaran taxon Ernietta. In addition, we perform simulations for multiple individuals, allowing us to analyze hydrodynamics of living communities. We show that Ernietta lived gregariously, forming shallow marine aggregations in the latest Ediacaran, 548 to 541 million years (Ma) ago. We demonstrate enhanced vertical mixing of the water column above aggregations and preferential redirection of current into body cavities of downstream individuals. These results support the reconstruction of Ernietta as a macroscopic suspension feeder and also provide a convincing paleoecological advantage to feeding in aggregations analogous to those recognized in many extant marine metazoans. These results provide some of the oldest evidence of commensal facilitation by macroscopic eukaryotes yet recognized in the fossil record.

Eukaryotic Cells, Animals, Water, Suspensions, Ecosystem, Fossils, Namibia, Eukaryota, Biological Evolution, Hydrodynamics
A new ophiocistioid with soft-tissue preservation from the Silurian Herefordshire Lagerstätte, and the evolution of the holothurian body plan.

Rahman, IA, Thompson, JR, Briggs, DEG, Siveter, DJ, Siveter, DJ, Sutton, MD

April 2019
|
Journal article
|
Proceedings. Biological sciences

Reconstructing the evolutionary assembly of animal body plans is challenging when there are large morphological gaps between extant sister taxa, as in the case of echinozoans (echinoids and holothurians). However, the inclusion of extinct taxa can help bridge these gaps. Here we describe a new species of echinozoan, Sollasina cthulhu, from the Silurian Herefordshire Lagerstätte, UK. Sollasina cthulhu belongs to the ophiocistioids, an extinct group that shares characters with both echinoids and holothurians. Using physical-optical tomography and computer reconstruction, we visualize the internal anatomy of S. cthulhu in three dimensions, revealing inner soft tissues that we interpret as the ring canal, a key part of the water vascular system that was previously unknown in fossil echinozoans. Phylogenetic analyses strongly suggest that Sollasina and other ophiocistioids represent a paraphyletic group of stem holothurians, as previously hypothesized. This allows us to reconstruct the stepwise reduction of the skeleton during the assembly of the holothurian body plan, which may have been controlled by changes in the expression of biomineralization genes.

Animals, Sea Cucumbers, Sea Urchins, Fossils, England, Biomineralization