Evolutionary aspects of cephalic sensory papillae of the Indo‐Pacific species of Eleotris (Teleostei: Eleotridae) - MNHN - Muséum national d'Histoire naturelle Access content directly
Journal Articles Zoologica Scripta Year : 2019

Evolutionary aspects of cephalic sensory papillae of the Indo‐Pacific species of Eleotris (Teleostei: Eleotridae)

Abstract

Eleotris species (Teleostei: Eleotridae) are one of the most common fish in Indo‐ Pacific estuaries and insular freshwater streams. In these rivers, they are a sit‐andwait predator. They have an amphidromous life cycle, that is adults grow, feed and reproduce in rivers, while larvae have a marine dispersal phase. Larvae recruit back to rivers and settle in stream habitats. Primary characters used to determine Eleotris species are the presence and the disposition of cephalic sensory papillae rows on the operculum and under the eyes as well as scale row numbers. The morphology of these cephalic sensory papillae is of particular importance in this predatory genus as it is generally correlated in fish to predation and feeding. In this paper, we have established a molecular phylogeny of the genus based on the 12 mitochondrial protein‐ coding genes to discuss the relationship between Indo‐Pacific Eleotris species. There is a well‐supported dichotomy in the molecular phylogeny, and this separation into two main clades is also morphologically visible, as it reveals a difference in the arrangement of cephalic sensory papillae. Indeed, the phylogeny distinguishes the species with the “open” pattern of the operculum sensory papillae and the species with the “closed” one. This phylogeny thus reflects the morphology of the opercular papillae. The evolution of this character is discussed in terms of the adaptation of the Eleotris genus to life in tropical insular river systems.

Dates and versions

mnhn-02309893 , version 1 (09-10-2019)

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Marion I. Mennesson, Ken Maeda, Philippe Keith. Evolutionary aspects of cephalic sensory papillae of the Indo‐Pacific species of Eleotris (Teleostei: Eleotridae). Zoologica Scripta, 2019, 48 (5), pp.627-639. ⟨10.1111/zsc.12366⟩. ⟨mnhn-02309893⟩
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