The genus Surinamysis (Mysida, Mysidae, Diamysini) from Amazonia and the coast of Brazil, with descriptions of two new species

in Crustaceana
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The mysid Surinamysis rionegrensis sp. nov. is described from Rio Negro, a large freshwater tributary of the Amazon. A supplemented description is given for the freshwater species S. robertsonae Bamber & Henderson, 1990, and its known distribution within the Amazon system is amended. A further representative of this genus, S. aestuaria sp. nov., is described from brackish waters within the estuary system of Rio Quatipuru on the NE coast of Brazil. These three species share large statoliths mineralized with vaterite, a metastable polymorph of crystalline calcium carbonate. Among the three flagella of the male antennula, the median, ventral one is identified as an accessory flagellum, as opposed to the Old World genera Mesopodopsis and Limnomysis, where the inner flagellum or lobe is accessory. The distinctive characters of Surinamysis and its five species are presented. The diagnosis of this genus is modified and a key to its species is given.

The genus Surinamysis (Mysida, Mysidae, Diamysini) from Amazonia and the coast of Brazil, with descriptions of two new species

in Crustaceana

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References

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Figures

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    Surinamysis robertsonae Bamber & Henderson, 1990, from the type locality Lago Calado (A, B, H, J) and from Lago Arara (C-G, K-M); allotype female with 5.3 mm body length (A, J), holotype male 5.6 mm (B, H); non-types: male 4.8 mm (C, M) and female 5.2 mm (D-G, K, L); A, cephalic region of female (setae omitted from antennal scale); B, eyes and anterior margin of carapace in male; C, male antennula, dorsal aspect (af = accessory flagellum); D, mandibles with right palp; E, tip of second thoracic endopod; F, tip of eighth thoracic endopod; G, detail of (F) showing modified seta at end of merus; H, J, terminal margin of sixth pleonite, lateral, in male holotype (H) versus female allotype (J); K, telson; L, series of thoracic exopods 1-8 (as basis and/or flagella, without setae) in female; M, series of thoracic exopods 1-8 (without setae) in male.

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    Surinamysis rionegrensis sp. nov. from the freshwater reach of Rio Negro about 80 km upstream of Manaus, holotype female with 5.6 mm body length; A, cephalic region (setae omitted from antennal scales); B, mandible with left palp; C, maxilla; D, first thoracopod with epipod and parts of sternites 1, 2; E, tip of second thoracic endopod; F, fifth thoracic exopod, setae omitted; G, sixth thoracic endopod; H, eighth thoracopod with its marsupial plate; J, detail of (H) showing terminal third of eighth endopod; K, detail of (J) showing the modified seta with its small accompanying seta at end of merus, side view; L, the two setae as in (K) from the opposite (right) endopod, top view; M, fourth pleopod; N, terminal margin of sixth pleonite, lateral; O, telson.

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    Surinamysis aestuaria sp. nov. from the estuary of Rio Cavalo, holotype female with 5.8 mm body length (A), allotype male 5.2 mm (B), paratype male 4.8 mm (C), paratype male 5.2 mm (D, F, G), and paratype female 5.6 mm (E, H) with one of its larvae (J); A, cephalic region of female (setae omitted from antennal scales); B, right male antennula, dorsal aspect (af = accessory flagellum); C, trunk of left male antennula, ventral aspect (af = accessory flagellum; am = appendix masculina = male lobe); D, labrum, dorsal aspect; E, mandibles with right palp; F, labium; G, maxillula; H, maxilla; J, nauplioid larva at stage N2, lateral.

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    Surinamysis aestuaria sp. nov. from the estuary of Rio Cavalo, paratype female with 5.6 mm body length (A, B, E-G) and paratype male 5.2 mm (C, D, H); A, first thoracopod including its epipod and thoracic sternites 1-4; B, second thoracic endopod in female; C, tip of second thoracic endopod in male; D, third thoracic endopod of male; E, the same for female; F, sixth thoracopod, arrow points to presumed rudimentary oostegite; G, series of thoracic exopods 1-8 (as basis and/or flagella, without setae) in female; H, series of thoracic exopods 1-8 (without setae) in male.

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    Surinamysis aestuaria sp. nov. from the estuary of Rio Cavalo, paratype male with 5.2 mm body length (A, B, E, F, K), paratype female 5.6 mm (C, D, G, L), allotype male 5.2 mm (H), and holotype female 5.8 mm (J); A, eighth thoracopods with penis; B, detail of (A) showing end of merus and entire ‘tarsus’ of male; C, end of merus and entire ‘tarsus’ of eighth thoracopod in female; D, detail of (C) showing the modified seta and its small accompanying seta; E, fourth pleopod of male; F, fifth pleopod of male; G, fifth pleopod of female; H, terminal margin of sixth pleonite in male, lateral; J, the same for female; K, uropods; L, telson.

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