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



  • ArianiA. P.WittmannK. J.2000. Interbreeding versus morphological and ecological differentiation in Mediterranean Diamysis (Crustacea, Mysidacea), with description of four new taxa. Hydrobiologia441: 185-236.

  • BăcescuM.GleyeL. G.1979. New Mysidacea from the Californian waters. Travaux du Muséum dH́istoire Naturelle « Grigore Antipa »20(1): 131-141.

  • De AngeliA.RossiA.2006. Crostacei ologocenici di Peralolo (Vicenza — Italia settentrionale), con la descrizione di una nuova specie di Mysida e di Isopoda. Società Veneziana di Scienze Naturali — Lavori31: 85-93.

  • NouvelH.1964. Mysidacés récoltés par S. Frontier a Nosy-Bé. I: Description de deux Leptomysini. Bulletin de la Société d’Histoire naturelle de Toulouse99(1/2): 107-123.

  • PriceW. W.HeardR. W.StuckL.1994. Observations on the genus Mysidopsis Sars, 1864, with the designation of a new genus, Americamysis, and the descriptions of Americamysis alleni and A. stucki (Peracarida: Mysidacea: Mysidae), from the Gulf of Mexico. Proceedings of the Biological Society of Washington107(4): 680-698.

  • SarsG. O.1872. Carcinologiske Bidrag til Norges fauna. I. Monographi over de ved Norges Kyster forekommende Mysider. Pt. 2. 1-34 pls. VI-VIII. Udgivet vid Bistand af det Kongelige Norske Videnskabsselskab i Trondhjem Brøoger & Christie’s Bogtrykkery Christiania.

  • SarsG. O.1884. Preliminary notice on the Schizopoda of H.M.S. Challenger expedition. Forhandlinger i Videnskabs-Selskabet 7(1883): 1-43. Christiania.

  • SchlacherT. A.WittmannK. J.ArianiA. P.1992. Comparative morphology and actuopalaeontology of mysid statoliths (Crustacea, Mysidacea). Zoomorphology112: 67-79.

  • TattersallO. S.1955. Mysidacea. Discovery Reports 28: 1-190. London.

  • TattersallO. S.1962. Report on a collection of Mysidacea from South African off-shore and coastal waters (1957-59) and from Zanzibar (1961). Proceedings of the Zoological Society of London139: 221-247.

  • TattersallO. S.1969. A synopsis of the genus Mysidopsis (Mysidacea, Crustacea) with a key for the identification of its known species and descriptions of two new species from South African waters. Journal of Zoology158: 63-79.

  • TattersallW. M.1922. Indian Mysidacea. Records of the Indian Museum24(4): 445-504.

  • TattersallW. M.1951. A review of the Mysidacea of the United States National Museum. Bulletin of the United States National Museum201: 1-292.

  • TattersallW. M.TattersallO. S.1951. The British Mysidacea. Ray Society Monograph no. 136: 1-460. (The Ray SocietyLondon).

  • WittmannK. J.1978. Biotop- und Standortbindung mediterraner Mysidacea: 1-211. (Dissertation Universität Wien Vienna).

  • WittmannK. J.1986. Saisonale und morphogeographische Differenzierung bei Leptomysis lingvura und zwei verwandten Spezies (Crustacea, Mysidacea). Annalen des Naturhistorischen Museums in Wien87B: 265-294pls. 1 2.

  • WittmannK. J.2013. Comparative morphology of the external male genitalia in Lophogastrida, Stygiomysida, and Mysida (Crustacea, Eumalacostraca). Zoomorphology132(4): 389-401.

  • WittmannK. J.ArianiA. P.LagardèreJ.-P.2014. Orders Lophogastrida Boas, 1883, Stygiomysida Tchindonova, 1981, and Mysida Boas, 1883 (also known collectively as Mysidacea). In: von Vaupel KleinJ. C.Charmantier-DauresM.SchramF. R. (eds.) Treatise on Zoology — Anatomy Taxonomy Biology. The Crustacea. Revised and updated as well as extended from the Traité de Zoologie4Part B Chapter 54: 189-396. (BrillLeiden).

  • WittmannK. J.SchlacherT. A.ArianiA. P.1993. Structure of Recent and fossil mysid statoliths (Crustacea, Mysidacea). Journal of Morphology215: 31-49.

  • WooldridgeT. H.1988. A new species of Mysidopsis (Mysidacea) from coastal waters of Southern Africa and a key to the known species from the subcontinent. Annals of the South African Museum98(4): 93-103.

  • ZimmerC.1912. Südwestafrikanische Schizopoden. In: SchultzeL.Zoologische und anthropologische Ergebnisse einer Forschungsreise im westlichen und zentralen Südafrika V. Denkschriften der medizinisch-naturwissenschaftlichen Gesellschaft zu Jena17(5-1): 1-11pls. I II [the same fascicle appeared integrated in different volume in 1928 — often cited as Zimmer 1928].

  • ZimmerC.1918. Neue und wenig bekannte Mysidaceen des Berliner Zoologischen Museums. Mitteilungen aus dem Zoologischen Museum in Berlin9: 13-26.


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    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).

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    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.

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    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.

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    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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