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  • 1
    Electronic Resource
    Electronic Resource
    Larval development of the euphausiid Euphausia pacifica in the Yellow Sea (1993)
    Springer
    Marine biology 115 (1993), S. 625-633 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The complete larval development of Euphausia pacifica in the Yellow Sea is described and the stages are compared with larvae of E. nana. Euphausiid larvae examined in the present study were collected at 30 stations in the Yellow Sea in 1989. During the stages of Calyptopis III to Furcilia II, E. pacifica larvae are smaller than E. nana larvae but they are larger from Furcilia III onward. There are geographical variations in body size of Calyptopis III among the southern California waters, the eastern Japan waters, the Japan Sea, and the Yellow Sea; body size is smallest in the Yellow Sea and Japan Sea, while it is largest in southern California waters and intermediate in eastern Japan waters. Segmentation of antennal endopods was observed in the 5″6 to 5″1 furcilia forms in the Yellow Sea population, suggesting that this characteristic is not as reliable for identification of furcilia stages as the pleopods and terminal telson spines. Thus, we propose here that there are six furcilia stages of E. pacifica, instead of the seven previously reported by Boden (1950).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349370
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  • 2
    Electronic Resource
    Electronic Resource
    Diet of calyptopes of the euphausiidEuphausia pacifica in the Yellow Sea (1991)
    Springer
    Marine biology 111 (1991), S. 45-48 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Foregut contents of calyptopes (the first feeding stage) ofEuphausia pacifica Hansen, collected from the Yellow Sea in June 1989, were examined using scanning electron microscopy with the dry-fracturing method. There was no clear evidence of phytoplankton ingestion by calyptopes. The foregut contents consisted entirely of amorphous organic detritus, crustacean remains and inorganic particles. The inorganic particles adhered to amorphous organic detritus, and bacterial populations were found on peritrophic membranes of fecal pellets which enveloped crustacean remains. These materials seemed to have originated from aggregates of organic and inorganic detritus. It is quite possible that the detrital aggregates are utilized extensively as food by calyptopes ofE. pacifica in the Yellow Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01986344
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Morphology of the gastric mill in ten species of euphausiids (1988)
    Springer
    Marine biology 97 (1988), S. 79-85 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract SEM observation revealed the detailed morphology of the gastric mill in ten species of euphausiids, Bentheuphausia amblyops, Thysanopoda acutifrons, Meganyctiphanes norvegica, Pseudeuphausia latifrons, Euphausia superba, Tessarabrachion oculatum, Thysanoessa longipes, Nematoscelis microps, Nematobrachion boopis, and Stylocheiron maximum. The well-developed gastric mill of euphausiids consists of a pair of cluster spines and a pair of lateral teeth displaying great diversity in morphology. It is suggested that there are three categories of gastric mill and filterpress (gland filter) within euphausiids. One is the well-developed gastric mill with filter-press of B. amblyops; a second is the well-developed gastric mill of M. norvegica, T. oculatum, E. superba, P. latifrons and T. longipes; and the third is the gastric mill without lateral teeth of T. acutifrons, N. microps, N. boopis and S. maximum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391247
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    Paper (German National Licenses)
    Fulltext
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