Varying colour pattern, yet genetically similar: Pebble Crab Seulocia vittata (Stimpson, 1858) (Brachyura: Leucosiidae) from the southeastern coast of India

Prakash, Sanjeevi; Kumar, Amit

doi:10.11609/jott.5801.12.5.15612-15618

Cited by 4 publications

(3 citation statements)

References 22 publications

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“…Furthermore, we observed that body colour can be either consistent within population but varying among populations (e.g., A. intermedius), or in other cases also highly variable within population (e.g., A. americanus). The occurrence of colour variants that showed within-species sequence divergence was also found in melon aphids (Lokeshwari et al 2014), pebble crabs (Prakash & Kumar 2020) and sea cucumbers (Jo et al 2016). However, Soto-Adames (2002 revealed that most populations of springtails differing only in colour pattern showed significant genetic divergence and thus were recognized as distinct species.…”

Section: Discussionmentioning

confidence: 75%

Species boundaries among extremely diverse and sexually dimorphic Arrenurus water mites (Acariformes: Hydrachnidia: Arrenuridae)

Więcek

Broda

Proctor

et al. 2023

saa

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Arrenurus (Arrenuridae) is the most species-rich genus of mites with about 1000 named species that inhabit standing, and to a lesser extent, running water habitats around the world. To date, distinguishing species of Arrenurus has been based on male reproductive morphology. Here, we use morphological and molecular approaches to examine species boundaries among 42 named species of Arrenurus, including four named species that have colour variants (red and green A. americanus, and red and blue A. intermedius, A. manubriator and A. apetiolatus), and two unnamed morphospecies. In this study, we examine male genital structures with the use of SEM techniques, and apply mitochondrial (COI barcode region) and nuclear (28S rRNA) gene fragments to test whether male morphology reflects species boundaries in Arrenurus assessed by molecular analyses. Our results reveal that male reproductive morphology parallels species boundaries as judged by molecular data. We discuss the cases of genetically poorly diversified, yet morphologically clearly defined named species. Moreover, we show that based on the species we examined, colour morphs within otherwise morphologically similar specimens represent within-species variation and, in the absence of other diagnostic traits, colour itself can be misleading in distinguishing species. Our outcomes on molecular taxonomy of Arrenurus provide a background for testing hypotheses about speciation rate in water mites.

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Section: Discussionmentioning

confidence: 75%

Species boundaries among extremely diverse and sexually dimorphic Arrenurus water mites (Acariformes: Hydrachnidia: Arrenuridae)

Więcek

Broda

Proctor

et al. 2023

saa

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“…The studied Indo-Westpacific species of purse crabs Seulocia vittata and Lyphira perplexa, living, often together, on sandy and silty bottom of sublittoral-upper shelf zones adjacent to seagrass beds and coral reef flats [Prakash, Kumar, 2020;Sudnik, Poddueva, 2021], had been some similar biological features. It is important to note that both samples of two species were represented by adults with no juveniles present that probably related to the method of collecting material.…”

Section: Discussionmentioning

confidence: 99%

Size composition, reproductive characteristics and food composition in crabs Seulocia vittata (Ortman, 1858) and Lyphira perplexa Galil, 2009 (Decapoda: Brachyura: Leucosiidae) from Nha Trang Bay (South Vietnam)

Burukovsky,

Sudnik

2024

Arthsel

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Data on the size composition, reproductive parameters and food composition of two widespread Indo-Westpacific crabs from the family Leucosiidae (Crustacea: Decapoda: Brachiura) were described: Seulotia vittata (244 specimens, carapace length 29.5-43.3 mm and body weight 1.80-5.72 g) and Lyphira perplexa (318 specimens, respectively 26.7-40.9 mm and 1.50-6.42 g). Crabs were collected in Nha Trang Bay (South Vietnam) in February 2007. They were found on sandy and silty bottom of the sublittoral at depths from 7 to 85 m. Juveniles were not found; the sex ratio (male to female) was close to one to one in S. vittata and 1.7 : 1 in L. perplexa. Both among males and females of both species were predominated specimens with similar carapace width (CW, near 18-22 mm). The size at first maturity of males was 19-20 mm CW in S. vittata and 21-24 mm CW in L. perplexa; in both species females this trait could not be determined: all of them were maturing or ripe.The main reproductive features of both species in Nha Trang Bay were quite similar. February was the time of their active spawning: egg-bearing specimens predominated; there were up to 40-55% of almost mature and pre-spawning females many. In S. vittata, fecundity was up to 3014 eggs with size of newly laid eggs 0.220 ± 0.01 × 0.245 ± 0.02 mm; in L. perplexa -3282 eggs with size 0.230 ± 0.01 × 0.259 ± 0.02 mm; egg volume was 0.005-0.006 mm 3 . In females of both species, there is a possibility of repeated spawning event in given reproductive period. Slightly larger fecundity and larger egg size in L. perplexa may contribute to its more successful reproduction in Nha Trang Bay, active dispersal and some numerical dominance.Judging by the contents of the stomachs, both species can be tentatively attributed to predator-gatherers or even attacking predators. In both species, decapod crustaceans play a significant role in food: in S. vittata these were peneid shrimps and Stomatopoda, i.e. bury and burrowing animals, and in L. perplexa -some kind of crab (possibly epibenthic). In S. vittata, bivalves (mainly infauna representatives) were present among the eaten mollusks, and in L. perplexa, epibenthous gastropods, as well as plant remains. At this level of knowledge of the composition of the food of these two species, it can be assumed that both of them are predators-benthophages that do not neglect necrophagy, but S. vittata is also a detritophagus that feeds mainly on infauna, and L. perplexa is rather an epibentophagus. Due to these crabs probably do not compete with each other.

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“…The occurrence of colour variants that showed within-species sequence divergence was also found in melon aphids (Lokeshwari et. al., 2014), pabble crabs (Prakash & Kumar, 2020) and sea cucumbers (Jo et. al., 2016).…”

Section: Discussionmentioning

confidence: 99%

Species boundaries among extremely diverse and sexually dimorphicArrenuruswater mites (Acariformes: Hydrachnidiae: Arrenuridae)

Więcek

Broda

Proctor

et al. 2021

Preprint

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Arrenurus (Arrenuridae) is the most species-rich genus of mites with about 950 named species that inhabit standing, and to a lesser extent, running water habitats around the world. To date, distinguishing species of Arrenurus has been based on male reproductive morphology. Here, we use morphological and molecular approaches to examine species boundaries among 42 named species of Arrenurus, including four named species that have colour variants (red and green A. americanus, and red and blue A. intermedius, A. manubriator and A. apetiolatus), and two unnamed morphospecies. In this study, we examine male genital structures with the use of SEM techniques, and apply mitochondrial (COI barcode region) and nuclear (28S rRNA) gene fragments to test whether male morphology reflects species boundaries in Arrenurus assessed by molecular analyses. Our results reveal that male reproductive morphology parallels species boundaries as judged by molecular data. We discuss the cases of genetically poorly diversified, yet morphologically clearly defined named species. Moreover, we show that based on the species we examined, colour morphs within otherwise morphologically similar specimens represent within-species variation and, in the absence of other diagnostic traits, colour itself can be misleading in distinguishing species. Our outcomes on molecular taxonomy of Arrenurus provide a background for testing hypotheses about speciation rate in water mites.

show abstract

Varying colour pattern, yet genetically similar: Pebble Crab Seulocia vittata (Stimpson, 1858) (Brachyura: Leucosiidae) from the southeastern coast of India

Cited by 4 publications

References 22 publications

Species boundaries among extremely diverse and sexually dimorphic Arrenurus water mites (Acariformes: Hydrachnidia: Arrenuridae)

Species boundaries among extremely diverse and sexually dimorphic Arrenurus water mites (Acariformes: Hydrachnidia: Arrenuridae)

Size composition, reproductive characteristics and food composition in crabs Seulocia vittata (Ortman, 1858) and Lyphira perplexa Galil, 2009 (Decapoda: Brachyura: Leucosiidae) from Nha Trang Bay (South Vietnam)

Species boundaries among extremely diverse and sexually dimorphicArrenuruswater mites (Acariformes: Hydrachnidiae: Arrenuridae)

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