The little shrimp that could: phylogeography of the circumtropical Stenopus hispidus (Crustacea: Decapoda), reveals divergent Atlantic and Pacific lineages

Abstract

The banded coral shrimp, Stenopus hispidus (Crustacea: Decapoda: Stenopodidea) is a popular marine ornamental species with a circumtropical distribution. The planktonic larval stage lasts ∼120–253 days, indicating considerable dispersal potential, but few studies have investigated genetic connectivity on a global scale in marine invertebrates. To resolve patterns of divergence and phylogeography of S. hispidus, we surveyed 525 bp of mitochondrial cytochrome c oxidase subunit I (COI) from 198 individuals sampled at 10 locations across ∼27,000 km of the species range. Phylogenetic analyses reveal that S. hispidus has a Western Atlantic lineage and a widely distributed Indo-Pacific lineage, separated by sequence divergence of 2.1%. Genetic diversity is much higher in the Western Atlantic (h = 0.929; π = 0.004) relative to the Indo-Pacific (h = 0.105; π < 0.001), and coalescent analyses indicate that the Indo-Pacific population expanded more recently (95% HPD (highest posterior density) = 60,000–400,000 yr) than the Western Atlantic population (95% HPD = 300,000–760,000 yr). Divergence of the Western Atlantic and Pacific lineages is estimated at 710,000–1.8 million years ago, which does not readily align with commonly implicated colonization events between the ocean basins. The estimated age of populations contradicts the prevailing dispersal route for tropical marine biodiversity (Indo-Pacific to Atlantic) with the oldest and most diverse population in the Atlantic, and a recent population expansion with a single common haplotype shared throughout the vast Indian and Pacific oceans. In contrast to the circumtropical fishes, this diminutive reef shrimp challenges our understanding of conventional dispersal capabilities of marine species.

Diversification and distribution of gall crabs (Brachyura: Cryptochiridae: Opecarcinus) associated with Agariciidae corals

“…Reef organisms appear to have utilised both paths. Atlantic populations that established after the closure of the Isthmus had to have dispersed around the Cape of Good Hope as has been demonstrated in brachyuran crabs (Guinot and Castro 2007;Rahayu and Ng 2014;Shih et al 2016) and other organisms, such as Etelis Cuvier, 1828 snappers, Gnatholepis Bleeker, 1874 gobies, Stenopus Latreille, 1819 shrimp, and the sea star Valvaster Perrier, 1875, some potentially facilitated by unusual life history strategies, such as larval cloning (Rocha et al 2005;Andrews et al 2016;Dudoit et al 2018;Collin et al 2020).…”

“…Phylogenetic analyses reveal that some species that range across the IWP and WA show little differentiation and are recently or currently connected (Collin et al 2020). Other species that were thought to be so wide-ranging turned out to be cryptic complexes, with divergent lineages in the IWP and WA (Michonneau 2015;Dudoit et al 2018). Many well-characterised and older WA endemics are nestled in IWP clades (O'Hara et al 2019).…”

The role of Central American barriers in shaping the evolutionary history of the northernmost glassfrog,Hyalinobatrachium fleischmanni(Anura: Centrolenidae)

“…Additionally, mtDNA is a robust indicator of population structure and historical biogeographic barriers and can be used to detect cryptic diversity (Gehara et al, 2014; Dudoit et al, 2018; Lait & Hebert, 2018). Mitochondrial DNA markers have been used in a variety of Central American studies to decipher genetic structuring (for a review, see Bagley & Johnson, 2014), allowing us to make direct comparisons with previous studies from this region.…”

Masters of communication: The brain of the banded cleaner shrimp Stenopus hispidus (Olivier, 1811) with an emphasis on sensory processing areas

“…The banded cleaner shrimp Stenopus hispidus (Olivier, 1811) is one of the most popular and thus intensely traded species of marine ornamental shrimps with a pan‐tropic distribution (Dudoit et al, ; Healy & Yaldwyn, ). Its other common names include coral banded shrimp, white‐banded shrimp, red‐banded shrimp, boxer shrimp, bandana shrimp, or barber pole shrimp.…”