Heteromysis sabelliphila sp. nov. (Mysida, Mysidae, Heteromysinae) in facultative association with sabellids from the Cape Verde Islands (subtropical N.E. Atlantic)

in Crustaceana
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A survey of crustaceans associated with benthic invertebrates in near-shore habitats at islands of the Cape Verde archipelago yielded a new species belonging to the genus Heteromysis, subgenus Olivemysis: H. sabelliphila sp. nov. shows a non-obligatory association with the sabellid polychaete Branchiomma nigromaculatum only during the night. This is the first documented mysid–polychaete association. The mysids apparently took particles collected by the polychaete, suggesting a kleptoparasitic interspecific relationship. A set of three specifically modified setae on the antennular trunk is shared by the new species with two Heteromysis species from Madeira (subtropical N.E. Atlantic), suggesting a close morphological relationship within the subgenus Olivemysis: with H. wirtzi, commensal of the sea anemone Telmatactis cricoides, and with H. dardani, commensal of the hermit crab Dardanus calidus. A key to the Heteromysinae of the E. Atlantic and Mediterranean is given.

Heteromysis sabelliphila sp. nov. (Mysida, Mysidae, Heteromysinae) in facultative association with sabellids from the Cape Verde Islands (subtropical N.E. Atlantic)

in Crustaceana



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    Heteromysis sabelliphila sp. nov. cruising at night over the tentacle crown of Branchiomma nigromaculatum (Baird, 1865) in sublittoral waters of the Cape Verde Islands (A, C, D, Sal Island, 24 Aug. 2007; B, Santiago Island, 21 Aug. 2007). A-C, adult females; D, adult male. Most specimens (B-D) are visible in dorso-lateral view; arrow (A) points to an incubating female in lateral view. Scale bars 4 mm. In situ photos by Peter Wirtz. This figure is published in colour in the online edition of this journal, which can be accessed via http://booksandjournals.brillonline.com/content/journals/15685403.

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    Heteromysis sabelliphila sp. nov., paratype male with 5.1 mm body length (A-G, K-M, O), paratype female 4.3 mm (H, J) and paratype male 2.7 mm (N); A, H, reflecting cervical areas are indicated by dashed lines and dots, orange to yellow (y) and white (w) areas by italics; A, cephalic region of male, dorsal view, details show modified setae (B-D) of antennular trunk, subrostral processes (E, in dorso-lateral view), and pore groups (F, G) on carapace; H, cephalic region of female, dorsal; J, tip of left antennular trunk in female, dorsal; K, the same for male, ventral; L, labrum, ventral; M, mandibles, rostral; N, labium, ventral/caudal; O, maxillula, caudal.

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    Heteromysis sabelliphila sp. nov., paratype female with 4.3 mm body length (A, D), and paratype male 5.1 mm (B, C, E-G); A, maxilla, rostral; B, first thoracopod, caudal; C, second thoracic endopod, caudal; D, third thoracopod of female, rostral; E, third thoracopod of male, caudal, detail (F) shows modified spine-seta; G, ‘tarsus’ of fourth thoracic endopod, rostral.

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    Heteromysis sabelliphila sp. nov., paratype female with 4.3 mm body length (A, O), paratype male 5.1 mm (B-M), and paratype male 2.7 mm (N); A, basis of sixth thoracic endopod with rudimentary oostegite, rostral; B, eighth thoracopod, rostral; C-K, dactylus with claw from series of first to eighth thoracic endopods, setae omitted; L, detail of (K) showing armature of claw from endopod 8; M, thoracic sternites 1-8 with left penis in large adult male, ventral; N, thoracic sternites 1-8 with right penis in small adult male, ventral; O, thoracic sternites 1-5 in female, ventral.

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    Heteromysis sabelliphila sp. nov., paratype male with 5.1 mm body length (A-F, H, K-M), paratype female 4.3 mm (G), and paratype male 2.7 mm (J); A, first male pleopod, caudal; B, second male pleopod, caudal; C, third male pleopod, caudal, detail (D) shows flagellate spine; E, fourth male pleopod, caudal; F, fifth male pleopod, caudal; G, third female pleopod, caudal; H, posterior margin of sixth pleonite in large male, lateral; J, posterior margin of sixth pleonite together with telson in small adult male, lateral; K, left uropods, dorsal; L, telson, dorsal, macrodistribution of scale-like cuticle structures is indicated as dotted areas (dots are not to scale); actual size and microdistribution of scales given in detail (M).

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