Chapter 2. The Species of Krill
J.H.S. Blaxter, Frederick S. Russell and Maurice Yonge
This chapter focuses on the species of Krill. It discusses the body form of the species and marked variations that were revealed during studies by various experts. The body form of a species can often vary, in some cases quite markedly. Mauchline and Fisher refer to the descriptions of forms of Thysanoessa inermis, Nematoscelis dificitis, Stylocheiron affine, and S. longicorne. Reference is also made to the smaller degrees of variation and to sexual dimorphism found among the following species: Euphausia diomedeae, E. triacantha, E. similis, E. vallentini, Nematoscelis microps, N. atlantica, and N. tenella. New forms of species have been described and further accounts of variation within species are now available. The chapter describes the similar as well as varied features between a male and a female krill and elaborates on the key identifiers between them. It also briefly discusses the key anatomic aspects of the species and traces the path of its evolution.
krill; Thysanoessa inermis, Nematoscelis dificitis; Stylocheiron affine; S. longicorne; Euphausia diomedeae; E. triacantha; E. similis; E. vallentini; Nematoscelis microps; N. atlantica; N. tenella
Aquaculture and Fisheries | Biology