<i>Carinina ochracea</i>(Palaeonemertea: Tubulanidae) Reaches Its Southernmost Distribution: New Morphological and Molecular Data

Fernández-Álvarez, Fernando Ángel; García‐Jiménez, Ricardo; Machordom, Annie

doi:10.2108/zs140228

Cited by 3 publications

(1 citation statement)

References 40 publications

(8 reference statements)

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“…Although it is assumed that concerted evolution mechanisms apply in ommastrephid mitochondria (Allcock et al, 2015), several variable positions were found. The IUPAC ambiguity codes were used to codify these nucleotide variable positions as in Fernández-Álvarez et al (2015a).…”

Section: Dna Extraction Amplification and Sequencingmentioning

confidence: 99%

An onto-phylogenetic journey through the life history of flying squids (Cephalopoda: Ommastrephidae)

Álvarez¹,

Fernando²

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Flying squids develop all its life cycle in the water column, as planktonic paralarvae and then as nektonic subadults and adults. In this Ph. D. Thesis, light was shed over several poorly understood aspects of the ontogeny and phylogeny of the Family Ommastrephidae. The mechanism of sperm migration from spermatangia to the female seminal receptacles was studied. Spermatozoa are able to actively migrate between both structures. The morphology of the hatchling of three Mediterranean ommastrephid species was studied based on embryos obtained by in vitro fertilization and a dichotomous key was develop to identify NE Atlantic species. The first feeding diet of paralarvae was assessed through laser-capture microdissection and DNA metabarcoding. The results indicate an ontogenetic shift from detritivorism to active predation. Molecular data indicate that the taxonomic name Ommastrephes bartramii actually hides four biological species. These advances in scientific knowledge have potential applications for a better understanding of the ecology, physiology, biodiversity and fishery science that will foster a deeper understanding of flying squids. Las potas desarrollan todo su ciclo vital en la columna de agua, como paralarvas planctónicas y luego como subadultos y adultos nectónicos. En esta Tesis Doctoral, se ha arrojado luz sobre algunos aspectos poco estudiados de la ontogenia y la filogenia de Familia Ommastrephidae. Se estudió el mecanismo de migración espermática desde los espermatangios hasta los receptáculos seminales de la hembra. Los espermatozoides son capaces de migrar activamente entre ambas estructuras. Se estudió la morfología de los recién nacidos de tres especies mediterráneas de pota basándose en embriones generados por fecundación in vitro y se desarrolló una clave dicotómica para identificar las especies del Atlántico NE. Se estudió la primera alimentación de las paralarvas mediante una combinación de microdisección láser y DNA metabarcoding: los resultados indican una fase detritívora seguida de un cambio ontogenético hacia la depredación activa. Nuestros datos moleculares muestran que bajo el nombre taxonómico Ommastrephes bartramii en realidad se esconden cuatro especies biológicas. Estos avances en el conocimiento científico tienen aplicaciones potenciales para una mejor comprensión de la ecología, fisiología, biodiversidad y ciencia pesquera de las potas

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Section: Dna Extraction Amplification and Sequencingmentioning

confidence: 99%

An onto-phylogenetic journey through the life history of flying squids (Cephalopoda: Ommastrephidae)

Álvarez¹,

Fernando²

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Global biodiversity of the genus Ommastrephes (Ommastrephidae: Cephalopoda): an allopatric cryptic species complex

Fernández-Álvarez

Braid

Nigmatullin

et al. 2020

Zoological Journal of the Linnean Society

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Cryptic speciation among morphologically homogeneous species is a phenomenon increasingly reported in cosmopolitan marine invertebrates. This situation usually leads to the discovery of new species, each of which occupies a smaller fraction of the original distributional range. The resolution of the taxonomic status of species complexes is essential because species are used as the unit of action for conservation and natural resource management politics. Before the present study, Ommastrephes bartramii was considered a monotypic cosmopolitan species with a discontinuous distribution. Here, individuals from nearly its entire distributional range were evaluated with mitochondrial DNA (cytochrome c oxidase subunit I and 16S rRNA). Four distinct species were consistently identified using four molecular species delimitation methods. These results, in combination with morphological and metabolic information from the literature, were used to resurrect three formerly synonymized names (Ommastrephes brevimanus, Ommastrephes caroli and Ommastrephes cylindraceus) and to propose revised distributional ranges for each species. In addition, diagnostic characters from the molecular sequences were incorporated in the species description. At present, only one of the four newly recognized species (Ommastrephes bartramii) is commercially exploited by fisheries in the North Pacific, but it now appears that the distributional range of this species is far smaller than previously believed, which is an essential consideration for effective fisheries management.

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A Taxonomic Catalogue of the Nemerteans (Phylum Nemertea) of Spain and Portugal

2015

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A literature-based taxonomic catalogue of nemerteans (phylum Nemertea) from Spain and Portugal is provided, listing 75 species (12 Palaeonemertea, 24 Pilidiophora, and 39 Hoplonemertea) belonging to 34 genera. This is a low species number compared with the approximately 400 species listed in Europe. This lack of knowledge is mainly due to the low number of researchers interested in the phylum and the well-known taxonomic difficulties of its study. Geographic records are indicated for each species, and for some, comments are included on certain biological and taxonomic aspects.

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Carinina ochracea(Palaeonemertea: Tubulanidae) Reaches Its Southernmost Distribution: New Morphological and Molecular Data

Cited by 3 publications

References 40 publications

An onto-phylogenetic journey through the life history of flying squids (Cephalopoda: Ommastrephidae)

An onto-phylogenetic journey through the life history of flying squids (Cephalopoda: Ommastrephidae)

Global biodiversity of the genus Ommastrephes (Ommastrephidae: Cephalopoda): an allopatric cryptic species complex

A Taxonomic Catalogue of the Nemerteans (Phylum Nemertea) of Spain and Portugal

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