Caligus pelamydis Krøyer, 1863

Dippenaar, Susan M. & Sebone, Makwena M., 2025, Caligus (Caligidae: Siphonostomatoida) species off southern Africa with the description of C. pillaii sp. nov., Zootaxa 5686 (2), pp. 151-197 : 165-166

Caligus pelamydis Krøyer, 1863

( Figs 11A – 12B )

Hosts: Thyrsites atun (Euphrasen) ( Gempylidae : Scombriformes); Seriola lalandi Valenciennes ( Carangidae : Carangiformes)

Locality: Off west coast South Africa (Atlantic Ocean)— T. atun , S. lalandi

Material examined: 6♀

Material collected: 11♀ from T. atun ; and 7♀ from S. lalandi

Voucher material: 2♀ ( SAMC-A099203 ) from T. atun deposited in the Iziko South African Museum , Cape Town, South Africa .

Adult female ( Fig. 11A ) almost 5 mm in total length; genital complex posterolateral corners not lobate, rounded; elongated abdomen, indistinctly 2-segmented, fusiform (evenly convex lateral margins); post-antennal process with reduced, vestigial tine (arrowed) ( Fig. 11B ); sternal furca tines broad, blunt-tipped ( Fig. 11C ); leg 1 last exopodal segment terminal spine 2 tapered (arrowed) ( Fig. 11D ); leg 2 exopodal segments 2 and 3 distolateral spines (arrowed) mostly aligned with longitudinal axis with ramus ( Fig. 11E ); endopodal segments 2 and 3 with large patch of denticles (arrowed) on outer margins ( Fig. 12A ); leg 4 last segment with extended distomedial fringe of modified pecten (arrowed) ( Fig. 12B ) (cf. Cressey & Cressey 1980; Boxshall 2018).

Remarks: This is the first report from S. lalandi off South Africa.

Figures

FIGURE 11. Caligus pelamydis Krøyer adult female: A. adult female, dorsal view; B. post-antennal process (arrow = tine); C. sternal furca; D. leg 1 last exopodal segment (arrow = tapered spine 2); E. leg 2 (arrows = distolateral spines segments 1 and 2).

FIGURE 12. Caligus pelamydis Krøyer adult female: A. leg 2 endopodal segments 2 and 3 outer margins (arrows = denticles); B. leg 4 exopod (arrow = modified pecten).