Shrimps of the genus Thor Kingsley, 1878 (Caridea, Thoridae): description of a new species using integrative data, remarks on Thor manningi Chace, 1972, and a world identification key

We tested the hypothesis that the Hainan’s squat shrimp Thor hainanensisXu & Li, 2014 undergoes a sex change and displays protandric hermaphroditism, a well-known feature from other congeners (T. dicaprioAnker & Baeza, 2021 and T. amboinensis (De Man, 1888)). We used morphological traits indicative of male function to categorize shrimp as prehensile males, non-prehensile males, and females. The linear relationship among the different morphological characters and the sexual morphs revealed that T. hainanensis has a sexual system of partial protandric hermaphroditism, where 50% of the population stays as active males and the rest of the population changes to female. Observations on the social and mating behaviour suggest that T. hainanensis exhibits a ‘search and defend’ mating system unlike other tropical caridean shrimps featuring protandrous hermaphroditism.

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Sexual and mating system in Thor hainanensis (Decapoda: Natantia: Thoridae) from the Lakshadweep Archipelago, India

Jose

Prakash

Kumar

et al. 2023

Journal of Crustacean Biology

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Morphology and molecular evidence reveal hidden diversity among snapping shrimp of the Alpheus obesomanus group (Decapoda: Alpheidae) with the description of a new species from Brazil

SANTOS,

TEROSSI,

MANTELATTO

et al. 2024

Zootaxa

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The snapping shrimp family Alpheidae Rafinesque, 1815 includes numerous species, most of which present controversial geographical distributions. The disjunct distribution of Alpheus simus Guérin-Méneville, 1856 in the western Atlantic, from Florida to the south of the Caribbean Sea and then from Rio Grande do Norte to Bahia in Brazil, suggests that Brazilian material may belong to an undescribed species. The examination of specimens previously identified as A. simus revealed the distinct morphology of material from Brazil, resulting in the description of a new species based on morphological and molecular evidence. The specimens were collected from fragments of fire coral at the Parque Municipal Marinho do Recife de Fora, Porto Seguro, Bahia, Brazil. Alpheus coralvivo sp. nov. belongs to the A. obesomanus group and is morphologically similar to A. simus (northwestern Atlantic) and A. saxidomus Holthuis, 1980 (eastern Pacific), differing mainly in the stylocerite and scaphocerite lengths and in the large gap between the cephalothorax and pleuron of the first pleonal segment. Molecular analysis using the mitochondrial cytochrome oxidase subunit I gene support the existence of the new species.

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Shrimps of the genus Thor Kingsley, 1878 (Caridea, Thoridae): description of a new species using integrative data, remarks on Thor manningi Chace, 1972, and a world identification key

Cited by 2 publications

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Sexual and mating system in Thor hainanensis (Decapoda: Natantia: Thoridae) from the Lakshadweep Archipelago, India

Sexual and mating system in Thor hainanensis (Decapoda: Natantia: Thoridae) from the Lakshadweep Archipelago, India

Morphology and molecular evidence reveal hidden diversity among snapping shrimp of the Alpheus obesomanus group (Decapoda: Alpheidae) with the description of a new species from Brazil

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