Publisher's Synopsis
Excerpt from An Account of the Crustacea of Norway, With Short Descriptions and Figures of All the Species, Vol. 5: Copepoda Harpacticoida; Parts 1 and 2, Misophriidæ, Longipediidæ, Cerviniidæ, Ectinosomidæ (Part)
The cephalosome is generally coalesced with the lst segment of the meta some, though in some few forms a well-marked demarcation between them may be found to exist. The lateral parts of this section are more or less expanded, being so deep in some forms, e. G. The genus Longipcdia, that they wholly include between them the oral appendages. It projects in front in a more or less distinct, generally lamellar rostrum, which in most cases is movably connected with the cephalic shield. The 3 succeeding segments of the metasome are always well defined, and are provided with more or less distinct epimeral plates. The last segment of the metasome, as stated above, has always a very movable articulation with the preceding segment, whereas it is firmly connected with the lst segment of the urosome. Its epimeral plates are generally obsolete, or at any rate much smaller than on the preceding segments. The urosome is composed of 5 segments. The first 2 of which, however, in the female are more or less completely coalesced, though in some forms a distinct suture between them is seen dorsally. In the male these 2 segments are always distinctly separated, and the lst of them pro jects at the end, on each side of the ventral face, to a small setiferous process. The caudal rami are in most cases short, and firmly connected with the last caudal segment. Of the apical setae, as a rule, only the 2 middle ones are well developed, the others being more or loss rudimentary. A single eye is generally present, though in some forms, especially in those from deep water, no trace of such an organ is to be found.
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