Mysids associated with sea anemones from the tropical Atlantic: descriptions of Ischiomysis new genus, and two new species in this taxon (Mysida, Mysidae, Heteromysinae)

in Crustaceana
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The males of Ischiomysis gen. nov. are unique among the currently known genera of the order Mysida by peculiar modifications of the ischium and praeischium of the eighth thoracic endopod. The type species, I. telmatactiphila sp. nov., forms compact aggregations above the oral disc of the club-tipped sea anemone Telmatactis cricoides from the island of São Tomé in the Gulf of Guinea. Less compact aggregations are formed by I. peterwirtzi sp. nov. from the island of São Vicente in the Cape Verde archipelago. Such looser aggregations were found in marine (micro)caves, wherein they extended over the anemones and adjacent rock recesses. An undetermined, visually similar mysid with similar distribution above the oral disc is documented by a colour photograph from Trindade, a small oceanic island in the tropical south-west Atlantic. Potential morphological relationships between the new genus and certain species of Heteromysis from the Caribbean and the Indian Ocean are discussed.

Mysids associated with sea anemones from the tropical Atlantic: descriptions of Ischiomysis new genus, and two new species in this taxon (Mysida, Mysidae, Heteromysinae)

in Crustaceana

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References

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Figures

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    Ischiomysis telmatactiphila sp. nov., holotype male with body length 3.5 mm (A, C, E, H) and paratype female 4.4 mm (B, D, F, G). A, cephalic region of male, dorsal view, detail shows cardial pore group; B, cephalic region of female, dorsal; C, D, antennula of male (C) and female (D), dorsal, details show the flagellate spines on the inner distal corner of the antennular trunk; E, antenna, dorsal; F, labrum, dorsal; G, mandibles, rostral; H, labium, ventral. A, B, E, setae partly omitted.

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    Ischiomysis telmatactiphila sp. nov., holotype, male with 3.5 mm body length (C-E, G, J) and paratype female 4.4 mm (A, B, F, H). A, maxillula, caudal; B, maxilla, rostral; C, first thoracopod (caudal) with first to sixth thoracic sternites (ventral); D, second thoracic endopod, caudal; E, F, third thoracopod as almost entire thoracopod (E, male) or only the tarsus of the endopod (F, female), rostral, details show the flagellate spines of the carpus; G, fourth thoracic endopod of male, rostral, details show modified setae of the carpus; H, tarsus of fourth thoracic endopod in female, rostral; J, tarsus of fifth thoracic endopod, rostral.

  • View in gallery

    Ischiomysis telmatactiphila sp. nov., holotype male with body length 3.5 mm. A-H, dactylus with claws from series of first to eighth thoracic endopods, setae omitted; J, eighth thoracopod with penis, rostral, details of the endopod show the praeischium and the flagellate spine of the ischium; K-M, series of first, fourth, and fifth male pleopods, rostral; N, uropods, dorsal, setae partly omitted; O, telson, dorsal.

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    Aggregation of an undetermined mysid species over the oral disc of the club-tipped anemone Telmatactis cricoides (Duchassaing, 1850) from Trindade, a small volcanic island 1160 km off the coast of south-eastern Brazil (20.50°S 29.33°W). Photo with kind permission by Lisandro de Almeida.

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    Ischiomysis peterwirtzi sp. nov., holotype male with body length 3.9 mm (A) and paratypes, female 4.8 mm (B), male 4.9 mm (C, E, G), female 5.2 mm (D) and female 5.3 mm (F). A, cephalic region of male, dorsal view, pores omitted; B, cephalic region of female, dorsal, detail shows cardial pore group; E, third thoracic endopod of male, caudal, details show the dactylus with claw and the flagellate spines of the carpus; F, tarsus of the third thoracic endopod in female, rostral, details show the flagellate spines of the carpus; G, fourth thoracic endopod of male, rostral, details show dactylus with claw and the modified setae of the carpus. A, B, setae partly omitted; E, G, setae omitted only from the details of the dactylus.

  • View in gallery

    Ischiomysis peterwirtzi sp. nov., paratypes, female with body length 5.2 mm (A, G), male 4.9 mm (B, D-F, H) and female 5.6 mm (C). A, sixth thoracic endopod with rudimentary oostegite, rostral, detail shows dactylus with nail; B, eighth thoracic endopod with penis, rostral, details show the praeischium, the flagellate spine of the ischium, and the dactylus with nail; C, eighth thoracopod with second oostegite, lateral, detail shows a smooth seta on the ischium; D-F, series of second, third, and fifth male pleopods, rostral; G, uropods, dorsal; H, telson, dorsal; J, nauplioid larva. C, G, setae partly omitted; A, B, setae omitted only from the details of the dactylus.

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