- Carlos Llorens, Alfonso Muñoz-Pomer, Lucia Bernad, Héctor Botella and Andrés Moya, A. (2009). Network dynamics of eukaryotic LTR retroelements beyond phylogenetic trees. Biology direct, 4(1): 1-31. (PDF)
- Elga Mark‐Kurik and Héctor Botella (2009). On the tail of Errivaspis and the condition of the caudal fin in heterostracans. Acta Zoologica. 90: 44-51. (PDF)
- Héctor Botella, Pablo Plasencia, Ana Marquez-Aliaga, Gillis Cuny, and Markus Dorka (2009). Pseudodalatias henarejensis nov. sp. a new pseudodalatiid (Elasmobranchii) from the Middle Triassic of Spain. Journal of Vertebrate Paleontology. 29(4): 1006-1012.
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Héctor Botella, Jose Ignacio Valenzuela and Carlos Martínez-Pérez. 2009. Tooth Replacement Rates In Early Chondrichthyans: A Qualitative Approach. Lethaia. 42(3): 365–376. doi: 10.1111/j.1502-3931.2009.00152.x (PDF)
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Héctor Botella, Philip C.J. Donoghue and Carlos Martínez-Pérez. 2009. Enameloid microstructure in the oldest known chondrichthyans teeth. Acta Zoologica (Stockholm) Morphology and Evolution. 90(1): 103-108. doi: 10.1111/j.1463-6395.2008.00337.x (PDF)