Morfología singular de un especimen de Thysanoessa spinifera Holmes 1900 (CRUSTACEA: EUPHAUSIACEA) en la costa de Oregon, USA.
DOI:
https://doi.org/10.37543/oceanides.v24i1.55Keywords:
Thysanoessa spinifera, euphausids, morphology, Euphausia pacificaAbstract
An individual is reported Euphausiid Thysanoessa spinifera Holmes 1900 with singular morphology, collected in the Oregon coast, USA (June 2001). This is a juvenile with a marked variation of the morphology originally described for juveniles and adults, given the absence of a face and the presence of a small keel directed towards forward on top of the carapace. The difference between the variability is defined intraspecific morphological at (1) population level (ecophenotype) and (2) individual variability as part of a natural gradient of the morphology of the organisms of the same population. It is considered unlikely that this specimen is a new species of euphausiid; It is proposed that it is an extreme case of individual variability of T. spinifera or a hybrid of T. spinifera and Euphausia pacifica.
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