. British fresh-water Copepoda. --. Copepoda; Crustacea. 58 BRITISH FRESH-WATER COPEPODA. bears an outer and a terminal plate representing exopod and endopod (Fig. 51). In Agnathaner the basal segment seems to represent segs. 1 and 2 completely fused, and with a single small inner lacinia (Fig. 52). The most complete form of maxillule in the Cyclo- poida is found in Cyclojpina. In C. schneideri {= C. brevifurca, Sars) the appendage distal to the gnatho- base consists of a single large segment bearing 2 outer plates (Fig. 53). There are 2 setae on the outer side at the base, probably representi
. British fresh-water Copepoda. --. Copepoda; Crustacea. 58 BRITISH FRESH-WATER COPEPODA. bears an outer and a terminal plate representing exopod and endopod (Fig. 51). In Agnathaner the basal segment seems to represent segs. 1 and 2 completely fused, and with a single small inner lacinia (Fig. 52). The most complete form of maxillule in the Cyclo- poida is found in Cyclojpina. In C. schneideri {= C. brevifurca, Sars) the appendage distal to the gnatho- base consists of a single large segment bearing 2 outer plates (Fig. 53). There are 2 setae on the outer side at the base, probably representing the epipod, and an inner seta, which is perhaps the vestige of lacinia 2. This. Figs. 51-54.—Maxillule. Fig. 51.—Doropygus porcicauda, after Sars. Fig. 52.—Agnathaner typicus, after Canu. Fig. 53.—Cyclopina Schneideri. Fig. 54.—Euryte longicauda. large plate corresponds exactly to seg. 3 of Agnathaner, with the exception that seg. 2 is fused to it instead of to seg. 1. The movable plates are, then, exopod and endo- pod, while the main segment represents segs. 2-4 of the Calanoid appendage. There are two small terminal lobes which may be the vestiges of lacinia 2 and 3. Exactly the same parts are recognizable in Oithona, though the endopod is reduced to a minute lobe, and the exopod is a dorsally directed prolongation of the segment. In these cases the whole distal part of the appendage may well be called the " palp," since it is a single entity distinct from the gnathobase. Even in the Calanoida the whole of the distal part of the limb from seg. 3 onwards moves and functions as one Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gurney, Robert. London : Ray Society
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Keywords: ., bookcentury1900, books, booksubjectcopepoda, booksubjectcrustacea
