The Euphausiidæ in the Neighbourhood of Plymouth. II. Nyctiphanes Couchii and Meganyctiphanes noruegica .

• Published in: Journal of the Marine Biological Association of the United Kingdom
• Main Author: Lebour, Marie V.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1925
• Subjects: Aquatic Science; Meganyctiphanes norvegica; Thysanoessa inermis
• Online Access: http://dx.doi.org/10.1017/s0025315400009279; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315400009279

The present paper is a continuation of last year's work on the Euphausiidæ in the neighbourhood of Plymouth (Lebour, 1924), in which the early larval stages were described of Nyctiphanes Couchii, Meganyctiphanes norvegica and, less fully, those of Thysanoessa inermis and T. neglecta . These two last-named forms are reserved for a detailed description in another paper, only Nyctiphanes and Meganyctiphanes being dealt with here. The first paper described these as far as the last Calyptopis stages, and it was shown that they were much alike although perfectly distinct, especially as regards colour. The nauplii and metanauplii were easily distinguishable. The whole of the remaining life-history of Nyctiphanes Couchii has now been elucidated and also that of Meganyctiphanes norvegica , with the exception of a few late larval stages. The absence of these, however, does not materially affect our knowledge of its life-history.