Description of the ‘stargazer mysid’ Mysidopsis zsilaveczi sp. nov. (Mysida, Mysidae, Leptomysinae) from the Cape Peninsula, South Africa

in Crustaceana
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Mysidopsis zsilaveczi sp. nov. shows colour patterns on the eye that mislead the observer in thinking that the eyes are facing upwards, largely irrespective of their actual orientation, and have resulted in local divers naming these animals ‘stargazer mysids’. To date, only males of the new species could be sampled. Within the species-rich genus Mysidopsis G. O. Sars, 1864 the males of M. zsilaveczi are characterized, besides their unique colour patterns, by a subdivided antennal scale; by a small, mid-dorsal protuberance on the carapace; by endopods of all pleopods having a large, expanded, plate-like exite on the basal segment; by the comparatively large, two-segmented endopod of pleopod 1; by uropodal endopods that extend well beyond the telson; and by having a linguiform telson with spines all along its lateral margins. The new species also shows diverse, very small, lobe-like structures on basis and dactylus of thoracic endopods 3-8. Closely similar structures were for the first time also found in Mediterranean material of M. angusta G. O. Sars, 1864 and M. gibbosa G. O. Sars, 1864. This new species raises the number of southern African Mysidopsis species to nine, confirming the coastal waters of this subcontinent as being one of the major hotspots of diversity in this genus. An updated key to the Mysidopsis species from southern Africa (Namibia plus South Africa) is provided.

Description of the ‘stargazer mysid’ Mysidopsis zsilaveczi sp. nov. (Mysida, Mysidae, Leptomysinae) from the Cape Peninsula, South Africa

in Crustaceana

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References

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Figures

  • View in gallery

    Colour patterns in adult males of the ‘stargazer mysid’ Mysidopsis zsilaveczi sp. nov. (specimens with about 12 mm body length; C, holotype); from marine hard substrates overgrown mainly by sponges, also by bryozoans, encrusting algae, etc., in sublittoral habitats off the Cape Peninsula, South Africa. Note the concentric colour bands on the eyes, and the semiocellate spots on the thorax. In situ photos by Guido Zsilavecz (Cape Town).

  • View in gallery

    Mysidopsis zsilaveczi sp. nov., male paratypes with body length 11.8 mm (A, B), 12.4 mm (C, H), 13.0 mm (D, E, J) and 10.8 mm (F, G, K): A, dorsal portions of the anterior body region, lateral; B, anterior body region, dorsal; C-E, details of the carapace from other individuals showing mid-dorsal hump (C) and three pore groups (C-E); F, antennula, obliquely dorsal-mesial; G, antenna, ventral; H, labrum, ventral; J, mandibles, caudal; K, incisory and central parts of left mandible, oblique view on inner face.

  • View in gallery

    Mysidopsis zsilaveczi sp. nov., male paratypes with body length 13.0 mm (A-C), 12.4 mm (D-M) and 10.8 mm (N): A, labium somewhat distorted, with part of sternite, ventral; B, maxillula, caudal; C, maxilla, rostral; D, thoracopod 1 (caudal) with sternite (ventral); E, thoracopod 2, rostral; F-H, details of panel E showing modified setae from carpus (F), propodus (G) and dactylus (H); J, thoracopod 3, rostral; K-M, details of panel J showing an unilaterally barbed seta (K) from the basal segment of the carpopropodus, a paradactylary seta (L) from the terminal segment of the carpopropodus, and the dactylus (M); N, thoracic sternites 3-7.

  • View in gallery

    Mysidopsis zsilaveczi sp. nov., male paratypes with body length 13.0 mm (A-E, G, K, L), 10.8 mm (F, J, M) and 11.8 mm (H): A, thoracopod 8 (rostral) with penis (lateral) and part of sternite (ventral); B, detail of panel A showing an unilaterally barbed paradactylary seta; C, right pleopod 1, rostral; D, right pleopod 4, caudal; E, detail of panel D showing the terminal segment with modified setae; F, segment with modified setae as in panel E from another specimen; G, left pleopod 5, rostral; H, pleonite 6 with tail fan, dorsal; J, uropods, ventral; K, spines close to inner margin of endopod of uropod in another specimen, ventral; L, telson with chromatophores, dorsal; M, tip of telson in another specimen.

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