Euphausia krohnii (Brandt, 1851)

Güreşen, Sedat Ozan, Received, Onur Gönülal, Online, Published & Version, Final, 2018, New records of pelagic fauna from the Turkish waters, Turkish Journal of Zoology 42, pp. 337-339 : 337

Euphausia krohnii (Brandt, 1851) ( Figure 2)

Material examined: Eight specimens (6 ♂♂, 2 ♀♀); 8–14 mm TL; Stations 1 (40.236°N, 25.402°E), 3 (40.257°N, 25.749°E), and 4 (40.312°N, 25.804°E).

* Correspondence: [e-mail]

Description: E. krohnii was identified by the following diagnostic characters according to Mauchline (1980): rostrum is long and sharply pointed. It reaches the anterior limit of the eyes. The gastric region is convex. Carapace has two pairs of lateral denticles. Euphausia species can be distinguished by the number of denticles in the lappet. Peduncle of 1st antenna has a pectinate lappet with 9 teeth (the outer one being distally trifurcate) projecting anteriorly over the 2nd segment. The dorsal margin of the 2nd segment has two short but prominent spine-like tubercles, one on the outer edge and one on the inner edge. The 3rd segment has a keel.

Distribution: E.krohnii occurs in the North and tropical Atlantic. It is reported from Norway’s waters ( Wiborg, 1968) to equatorial African waters ( Boden and Day, 1954). It also found throughout the Mediterranean Sea ( Wiebe and D’Abramo, 1972; Guglielmo, 1979; Mauchline, 1980). Its presence was previously confirmed in the Turkish seas from the Levantine basin ( Gücü et al., 2000).

Although a total of 9 species belonging to the order Euphausiacea have been found off the coasts of Turkey, they have not been reported from the Turkish coast of the Aegean Sea so far ( Bakır et al., 2014). The current study reports the first E. krohnii specimens from the Turkish coast of the Aegean Sea.

Phylum: Arthropoda

Subphylum: Crustacea

Superclass: Multicrustacea

Class: Malacostraca

Order: Decapoda

Suborder: Dendrobranchiata