Caligus sp. 1
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publication ID |
https://doi.org/10.11646/zootaxa.5686.2.1 |
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publication LSID |
lsid:zoobank.org:pub:FAE3CA10-9DC4-45E0-819E-6F3A02CE7F20 |
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persistent identifier |
https://treatment.plazi.org/id/5E1F87E2-6C5E-9A32-FF6D-F98DFA9AFDB4 |
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treatment provided by |
Plazi |
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scientific name |
Caligus sp. 1 |
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( Figs 16A View FIGURE 16 – 17E View FIGURE 17 )
Host: Galeorhinus galeus (Linnaeus) ( Carcharhiniformes : Triakidae )
Locality: Off west coast South Africa (Atlantic Ocean)
Material examined: 1♀
Material collected: 1♀ from G. galeus
Adult female ( Fig. 16A View FIGURE 16 ) cephalothorax more than half of total length; genital complex slightly longer than wide, posterolateral corners lobate; abdomen small, 1-segmented, about ⅓ length of genital complex, posterior margin protruded with slit-like anus ( Fig. 16B View FIGURE 16 ); antenna (a2) with small proximal process (arrowed) ( Fig. 16C View FIGURE 16 ), claw strongly curved ( Figs 16C, D View FIGURE 16 ); post-antennal process (pap) tine weakly curved, blunt-ending ( Figs 16C, D View FIGURE 16 ); maxillule with dentiform posterior process (mpp) slightly curved, blunt tip ( Figs 16C, D View FIGURE 16 ); sternal furca with short, divergent, blunt-ended tines curved inwards distally ( Figs 16D, E View FIGURE 16 ); leg 1 last exopodal segment with 3 posterior pinnate setae, terminal seta 4 (4) distinctly longer than terminal spines (ts) 1–3, almost as long as segment, spines 2 and 3 with accessory processes (ap) ( Fig. 16F View FIGURE 16 ) longer than spine 1; leg 2 exopod segments 1 and 2 distolateral spines (arrowed) lying obliquely over surface of ramus, not reaching the inner setae ( Fig. 17A View FIGURE 17 ), endopodal segment 2 with setules (s) along outer margin, endopodal segment 3 with patch of denticles (d) proximally on outer margin ( Fig. 17B View FIGURE 17 ); leg 3 exopodal segment 1 distolateral spine (ds) slightly curved, not reaching articulation between segments 2 and 3 ( Fig. 17C View FIGURE 17 ); leg 4 3-segmented with I, III spines (arrowed) respectively, increasing in length from outer to inner ( Fig. 17D View FIGURE 17 ).
Remarks: This specimen exhibits all the distinguishing features of the C. macarovi -group except the marginal serrations on the distal margin of the maxilla brachium (cf. Fig. 63G in Boxshall (2018)) that was not observed (arrowed) ( Fig. 17E View FIGURE 17 ) and leg 1 exopod spines 1 to 3 that is not of similar length, but with spine 1 about half the length of spines 2 and 3 (see Fig. 16F View FIGURE 16 ). Thus, it was compared with the descriptions and/or illustrations of all 42 species currently in this group (see Table 5 in Boxshall 2018). Although the habitus is the closest to that of C. pseudokalumai Lewis it differs in many other aspects from this species i.e. the total length of the current specimen (3.43 mm vs 2.89 mm) the size of the proximal process on the antenna, the structure of the maxillule dentiform posterior process, the shape of the sternal furca tines, the length of the leg 1 last exopod terminal spine 1 and also the length of the spines on leg 4 (cf. Lewis 1968).
Additionally, the only species reported from an elasmobranch that forms part of the C. macarovi -group is C. punctatus Shiino ( Tang & Newbound 2004). The current specimen differs in the structure of the habitus (see Fig. 1 View FIGURE 1 in Shiino (1955)) as well as in total length (3.43 mm vs 2.49 mm) from C. punctatus as well as in the morphology of the antenna proximal process, maxilliped, length of leg 1 last expodal terminal spines, leg 2 length of exopodal spines, leg 4 length of spines (cf. Shiino 1955).
The structure of legs 1 and 4 is similar to that of C. tumulus Hayes, Christison, Vaughan, Smit & Boxshall, 2021 (see Fig. 6G View FIGURE 6 in Hayes et al. (2021)), but the current specimen clearly differs from C. tumulus in many other aspects of the morphology (e.g. habitus, antenna proximal process, maxillule posterior process, maxilliped, sternal furca) (cf. Hayes et al. 2021).
Therefore, this may be a new species, but with only one available specimen it will remain as Caligus sp.
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.