In the footsteps of Henrik Nikolaj Krøyer: the rediscovery and redescription of Leptochelia savignyi (Krøyer, 1842) sensu stricto (Crustacea: Tanaidacea: Leptocheliidae)

Bamber, Roger N.

doi:10.2988/10-14.1

Cited by 36 publications

(44 citation statements)

References 21 publications

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“…Clearly there are at least two proven possibilities: frequent rafting events (Larsen 2005, Bamber 2012a; and the presences of multiple, morphologically almost inseparable species known as species complexes (Larsen 2001, Bamber 2010, 2012b. …”

Section: Discussionmentioning

confidence: 99%

Genetic divergence of tanaidaceans (Crustacea: Peracarida) with low dispersal ability

Larsen¹,

Tuya

Froufe³

2014

Sci. Mar.

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Summary:In this study, the phylogeographic patterns of nuclear, ribosomal and mtDNA gene fragments of five tanaidacean species (Zeuxo, Tanaidae) from the Atlantic, Pacific and Mediterranean Sea were investigated. We aimed to interpret results in the framework of current hypotheses on the distribution of small invertebrates with very limited dispersal ability. Evidence for a surprisingly high genetic divergence was found for intertidal tanaidaceans from the North Atlantic. This is a result of poor dispersal potential, as tanaidaceans have direct development, no pelagic stage, and very limited swimming capacity. However, lower genetic divergence was found between an intertidal tanaid species from the North Atlantic and two from the North Pacific, which suggests a scenario of recent colonization following the last glacial maximum. The species Zeuxo normani was found to be a species complex consisting, at least, of Z. normani (California), Z. cf. normani (Japan), Z. cf. normani (Australia), Z. sp. A (Korea), and Z. holdichi (Spain and France). Our results showed that traditional species identification underestimates tanaidacean diversity and that what have been previously perceived as reliable diagnostic morphological characters, are, however, variable and unreliable.Keywords: genetic divergence; morphological differences; 28S; H3; COI; Crustacea; Tanaidacea; Zeuxo. Divergencia genética de tanaidáceos (Crustacea: Peracarida) con baja capacidad de dispersiónResumen: En este estudio, investigamos los patrones filogeográficos de fragmentos de ADN nuclear, ribosómico y mitocondrial de 5 especies de tanaidáceos (Zeuxo, Tanaidae) del Atlántico, Pacífico y Mediterráneo. Nos propusimos interpretar los resultados en el marco de hipótesis sobre la distribución de pequeños invertebrados con limitada capacidad de dispersión. Encontramos evidencia de una sorprendentemente alta diferenciación genética para tanaidáceos del medio intermareal del Atlántico Norte. Esto es resultado de una limitada capacidad de dispersión, ya que los tanaidáceos poseen desarrollo directo, carecen de estadíos pelágicos, y una limitada capacidad natatoria. Sin embargo, encontramos una baja diferenciación genética para una especie de tanaidáceo del Atlántico Norte y dos del Pacífico Norte, lo que sugiere un escenario de reciente colonización tras la última glaciación. La especie Zeuxo normani constituye un complejo de especies que, al menos, agrupa a Z. normani (Califonia), Z. cf. normani (Japón), Z. cf. normani (Australia), Z. sp. A (Corea) y Z. holdichi (España y Francia). Nuestros resultados mostraron que la forma tradicional de identificar tanaidáceos subestima su diversidad y que lo que previamente se consideraron como caracteres morfológicos claramente diferenciadores son, sin embargo, variables y poco fiables.Palabras clave: diferencias genéticas; diferencias morfológicas; 28S; COI; crustáceos, tanaidáceos, Zeuxo.Citation/Como citar este artículo: Larsen K., Tuya F., Froufe E. 2014. Genetic divergence of tanaidaceans (Crustacea: Peracarida) with l...

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Section: Discussionmentioning

confidence: 99%

Genetic divergence of tanaidaceans (Crustacea: Peracarida) with low dispersal ability

Larsen¹,

Tuya

Froufe³

2014

Sci. Mar.

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“…The male/female ratio in tanaidomorphs varies from scarcely biased, nearly 1.0 in the family Agathotanaidae [16] to strongly female biased, to 0.001 in Leptocheliidae [17,18]; in Tanaididae, Rumbold et al [19] found values ranging from 0.01 to 0.16 in Tanais dulongii (Audouin, 1826), thus significantly lower than the average per sample registered here (0.25).…”

Section: Sex Ratio and Fecunditymentioning

confidence: 56%

Description, systematics and ecology of a new tanaidacean (Crustacea, Peracarida) species from mediterranean fish farms

Esquete

Fernandez-González

2016

Helgol Mar Res

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An undescribed species of tanaidacean belonging to the genus Hexapleomera, tribe Pancolini, Hexapleomera bultidactyla sp. nov. was found in fouling community samples from off-coast fish farms cages in the western Mediterranean Sea. The species can be distinguished from other Hexapleomera species by the presence of a ventral apophysis on the dactylus of the chela in males. Other diagnostic characters (in combination) include a male antennule with five aesthetascs, the female with three, the maxillule palp with four terminal setae and maxilliped basis and coxa each with two setae; the male fixed finger with four ventral setae and proximal apophysis, the female chela fixed finger with a proximal triangular apophysis, an apophysis on the coxa of pereopod 1, a pleopod 3 basis with three outer setae, and an uropod of four segments. Although several substrata were investigated, the species was most abundant where the turf formed by Ceramiaceae algae and the hydroid Aglaophenia sp. was dominant. An updated identification key to all the species of Hexapleomera is provided.

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“…Secondary males have been shown to derive from protogynous development in some cases (Lang 1958;Gardiner 1975), while in other species, they derive from males I which are simply subadults (Bamber 2010), and in other cases, all types of males are reproductive (Hamers and Franke 2000;Fonseca and D'Incao 2003). In Apseudopsis adami the penial tubercle is differentiated in the juvenile stage, and there is no particular reason to consider protogyny.…”

Section: Life History and Developmentmentioning

confidence: 99%

“…Despite being a morphologically conservative taxon at the generic level, tanaidacean species present high intraspecific variability depending on the gender and developmental stage of the individual. Such variability can make identification to species level difficult, especially when juveniles represent the majority of the individuals within a population and when sympatric species of the same genus are found (Bamber 2010;Larsen and Froufe 2010;Esquete et al 2012). Therefore, complete descriptions that include intraspecific variation are especially important in such species, and the definition of characters that allow positive, unequivocal identification of the specimens to species level are crucial for accurate faunistic and ecological studies.…”

Section: Introductionmentioning

confidence: 99%

Apseudopsis adami, a new species of tanaidacean (Crustacea: Peracarida) from the NW Iberian Peninsula: postmarsupial development and remarks on morphological characters

Esquete

Bamber²,

Moreira

et al. 2012

Helgol Mar Res

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A new species of apseudomorph tanaidacean, Apseudopsis adami sp. nov., is described, including intraspecific variation, from specimens collected in the seagrass meadows of O Grove inlet (NW Iberian Peninsula, NE Atlantic). The new species is characterized by the unique combination of the following characters: pointed rostrum with rounded shoulders, four ventral propodal spines on pereopod 1, and posterolateral pointed apophyses on pereonites 2-5, regardless of the developmental stage of the individual. Two juvenile stages were identified before reaching maturity; early juvenile limbs are scarcely ornamented in comparison to the adults. Advanced juveniles represent the vast majority of the studied population, and the limb ornamentation is similar to that of the adults. Males show two different cheliped morphologies. After a preparatory stage, females pass through a sequence of copulatory instars followed by intermediate stages in which the female loses the ovisac after manca release. The number of segments of the antennular and antennal flagella and uropod endopods, as well as the development and ornamentation of the mandibular palp, are meristic changes that occur during development and allow rapid identification of the developmental instar.

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In the footsteps of Henrik Nikolaj Krøyer: the rediscovery and redescription of Leptochelia savignyi (Krøyer, 1842) sensu stricto (Crustacea: Tanaidacea: Leptocheliidae)

Cited by 36 publications

References 21 publications

Genetic divergence of tanaidaceans (Crustacea: Peracarida) with low dispersal ability

Genetic divergence of tanaidaceans (Crustacea: Peracarida) with low dispersal ability

Description, systematics and ecology of a new tanaidacean (Crustacea, Peracarida) species from mediterranean fish farms

Apseudopsis adami, a new species of tanaidacean (Crustacea: Peracarida) from the NW Iberian Peninsula: postmarsupial development and remarks on morphological characters

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