. British fresh-water Copepoda. --. Copepoda; Crustacea. ERGASILID^E. 309 Mandible with exopod of 3 segments with 3 setae; endopod of 2 segments, seg. 1 with 2 inner spines, seg. 2 with 3 setae and a spatulate aesthete or modified seta. Stage II differs only in having 2 pairs of fureal setae. Stage III has a rudiment of the maxillule in the form of a papilla with one Figs. 1916-1918.—Thersitina gasterostei. Nauplii. Fig. 1916.—Nauplius, stage I. Fig. 1917.—Nauplius, stage III. Fig. 1918.—Nauplius, stage IV. Stage IV has 2 pairs of furcal setae and 2 pairs of small spines. The mandible h
. British fresh-water Copepoda. --. Copepoda; Crustacea. ERGASILID^E. 309 Mandible with exopod of 3 segments with 3 setae; endopod of 2 segments, seg. 1 with 2 inner spines, seg. 2 with 3 setae and a spatulate aesthete or modified seta. Stage II differs only in having 2 pairs of fureal setae. Stage III has a rudiment of the maxillule in the form of a papilla with one Figs. 1916-1918.—Thersitina gasterostei. Nauplii. Fig. 1916.—Nauplius, stage I. Fig. 1917.—Nauplius, stage III. Fig. 1918.—Nauplius, stage IV. Stage IV has 2 pairs of furcal setae and 2 pairs of small spines. The mandible has lost the aesthete of the endopod and has 3 spines in the masticatory fork. The maxillule is a bilobed plate. No older stage has been seen. Wilson figures the last nauplius of Ergasilus, which is hardly distinguishable from that of Cyclops. He shows, however, the rudiment of the maxillule at the base of the mandible, and interprets the appendage which. 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
