Gallery
Journal and Book Covers
The cover of Science magazine which accompanied a paper announcing the discovery of a tetrapod humerus in 2004. Photomontage and illustration by Kalliopi Monoyios
The cover of Nature magazine which accompanied the two papers announcing the discovery of Tiktaalik roseae in 2006. Photomontage and illustration by Kalliopi Monoyios
Cover accompanying article by J.A. Gillis. Photomontage by Kalliopi Monoyios
The cover of Your Inner Fish: A Journey into the 3.5-Billion-Year History of the Human Body by Neil Shubin. Illustration by Kalliopi Monoyios
Paleontology
Reconstructed fin of Tiktaalik roseae in dorsal and ventral views. Stipple illustration by Kalliopi Monoyios
The holotype of Tiktaalik roseae Photo: Ted Daeschler
The braincase of Tiktaalik roseae described in Downs et. al, 2008. Illustration by Kalliopi Monoyios
Developmental Biology
Skate and zebrafish CsB enhancers promote distal limb expression in transgenic mice. Transgenic mouse embryos at E12.5 stained for X-gal. (A and B) Chicken CsB embryo showing X-gal signal in the brain and neural tube; limb signal extends across the base of the digits. (C and D) Zebrafish CsB embryo shows X-gal staining in face; limb signal extends anteriorly at the base of digits 3, 4, and 5. (E and F) Skate CsB embryo displaying X-gal staining along the neural tube; limb signal is present indistal zeugopod, as well as the wrist and at the base of the digits. Position of digit I is noted in B, D, and F. from Schneider et. al, 2011
Putatively homologous mechanisms regulate gnathostome appendage outgrowth. Comparative analyses of the fins and limbs of skates and chicks, and the gill arch of chondrichthyans, reveal that shared developmental signaling pathways regulate skeletal outgrowth and patterning. from Gillis et. al, 2009
Retinoic acid affects dose- and stage-dependent fin skeleton alterations in chondrichthyans. from Dahn et. al, 2007
A-D: Gill arches in the skate are composed of a dorsal epibranchial (eb), ventral ceratobranchial (cb) element, and branchial rays (br) that project laterally and curve caudally. E-H:RA-treated arches exhibit mirror-image duplications of the branchial rays (red arrows) which articulate with the anterior border of the epibranchial and curve rostrally. from Gillis et. al, 2009
For more images of labwork and field work, visit the Tiktaalik Image Gallery.