Caligus belones Krøyer, 1863
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publication ID |
https://doi.org/ 10.11646/zootaxa.5360.4.5 |
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publication LSID |
lsid:zoobank.org:pub:EA1BE6F9-88E2-4357-895E-8ED415206592 |
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DOI |
https://doi.org/10.5281/zenodo.10164662 |
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persistent identifier |
https://treatment.plazi.org/id/03AFA377-FFB0-FFEE-FF7A-9566F5C0FEC7 |
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treatment provided by |
Plazi |
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scientific name |
Caligus belones Krøyer, 1863 |
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Caligus belones Krøyer, 1863 View in CoL
Material examined by R. F. Cressey: One female from Belone belone (Linnaeus, 1760) caught in the river Elbe, Germany and stored in the Smithsonian Institution , Washington D.C., USA (Reg. No. USNM 180596 View Materials ) .
Supplementary Description: Genital complex of female about 1.2 times longer than wide and about 2.3 times longer than abdomen; genital complex with rounded posterolateral lobes; abdomen about 1.4 times longer than wide, with lateral swellings anterior to midlevel ( Fig. 1A View FIGURE 1 ). Caudal rami about 1.6 times longer than wide. Antenna ( Fig. 1B View FIGURE 1 ) with irregularly tapering posterior process on proximal segment; subchela armed with 2 setae located proximally and near anterior margin. Postantennal process ( Fig. 1B View FIGURE 1 ) with small base and weakly curved tine. Posterior process of maxillule ( Fig. 1B View FIGURE 1 ) strongly tapering towards acute tip. Sternal furca with widely divergent tines ( Fig. 1C View FIGURE 1 ). Second exopodal segment of leg 1 ( Fig. 1D View FIGURE 1 ) armed with 3 plumose setae along posterior margin; distal margin spines 1 to 3 each with accessory process; seta 4 more than twice as long as spine 1 and longer than segment. Leg 2 ( Fig. 1E View FIGURE 1 ) with outer margin of second endopodal segment ornamented with setule row; first and second exopodal segments armed with outer spines directed obliquely across surface of ramus; third segment armed with II, I, 5. First exopodal segment of leg 3 ( Fig. 1F View FIGURE 1 ) lacking inner seta; armed with short, slightly curved, outer spine ornamented with narrow flange along lateral margin, spine not reaching articulation separating second and third segments. Leg 4 ( Fig. 1G View FIGURE 1 ) with 2-segmented exopod armed with I, IV spines, each with conspicuous pecten at base.
Remarks: Caligus belones has a complicated history. It was first described by Krøyer (1863) based on females collected from Belone belone (as “Hornfisk”) caught in Denmark. Later Wilson (1905) provided a redescription of a species he identified as C. belones but unfortunately Wilson’s species has a 2-segmented exopod on leg 4 with a spine formula of I, III whereas Krøyer (1863: pl. VII, Fig. 1e View FIGURE 1 ) shows the formula of C. belones as I, IV. The species described by Wilson (1905) was renamed C. wilsoni by Delamare Deboutteville & Nuñes-Ruivo (1958) in a paper which provided a partial redescription of true C. belones . Other partial descriptions are available (e.g. Cressey & Collette, 1970) but none provides the detail needed for the development of the online key.
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Departamento de Geologia, Universidad de Chile |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.