Longidentia Daneliya, 2004

Wittmann, Karl J., Ariani, Antonio P. & Daneliya, Mikhail, 2016, The Mysidae (Crustacea: Peracarida: Mysida) in fresh and oligohaline waters of the Mediterranean. Taxonomy, biogeography, and bioinvasion, Zootaxa 4142 (1), pp. 1-70 : 18

Subgenus Longidentia Daneliya, 2004

Occiparamysis Daneliya, 2004 , syn. nov.

Revised diagnosis. Anterior margin of carapace convex, smoothly rounded. Antennal scale with clearly produced distal part ( Fig. 8 B, H). Median segment of mandibular palp with normal, smooth or at most slightly barbed setae ( Fig. 9 A). Thoracic endopods 3–8 with 3-segmented propodus ( Figs 9 G, H, 10A, D, F, H). Penis with row of short, barbed setae in subterminal position on caudolateral blade ( Fig. 9 H). Telson roughly as long as last abdominal segment, with strong, subrectangular cleft ( Fig. 10 U). Cleft laminae without lateral wing-like expansions ( Fig. 10 V).

Type species. Mesomysis Kröyeri Czerniavsky, 1882b: 46 , as defined in Daneliya (2004).

Remarks. The characters of P. adriatica sp. nov. take an intermediate position between the subgenera Longidentia and Occiparamysis , thus diminishing their diagnostic significance. In particular, being rather similar to P. agigensis Băcescu, 1940 (see details below), P. adriatica still lacks the most important distinguishing character of Occiparamysis —long and strong setae on penis outer lobe—rather having short, thin setae like in the species of Longidentia . Thus, upon synonymising Occiparamysis with Longidentia , we also propose the new, revised combination Paramysis (Longidentia) agigensis Băcescu, 1940 . The redefined subgenus Longidentia is most similar to the subgenus Pseudoparamysis Băcescu, 1940 , from which it differs by the 3-segmented propodus of thoracic endopods 3–8 (reduced, 1- or 2-segmented propodus of endopods 7–8 in species of Pseudoparamysis ).

Figures

FIGURE 8. Paramysis (Longidentia) adriatica sp. nov. from the Adige River, holotype, male with body length 9.1 mm (A), paratypes female 9.5 mm (B), male 7.9 mm (C – F, H, K), and female 10.9 mm (G, J). A, male habitus, lateral; B, anterior body region of female, dorsal; C, carapace expanded on slide, dorsal, details show cervical (D) and cardial (E) pore groups; F, antennula of male, dorsal; G, antennula of female, dorsal; H, antenna, ventral; J, labrum, ventral; K, maxillula, caudal.

FIGURE 9. Paramysis (Longidentia) adriatica sp. nov. from the Adige River, paratypes, male with body length 7.9 mm (A – F, H), and female with 10.9 mm (G). A, mandibles, rostral; B, labium, caudal; C, maxilla, rostral; D, male thoracic sternites 1 – 8 (ventral) with left first thoracopod (caudal); E, lateral view on male sternal processes or humps in the sagittal plane; F, second thoracic endopod, caudal; G, sixth thoracic endopod with rudimentary oostegite, rostral; H, eighth thoracopod (caudal) with penis (postero-lateral blade of penis is accidentally shifted antero-laterally).

FIGURE 10. Paramysis (Longidentia) adriatica sp. nov. from the Adige River, paratypes, female with body length 10.9 mm (A – G, V), and males with 7.9 mm (H – P, R – U) or 9.1 mm (Q), respectively. A, female tarsus 3, i. e. tarsus of third thoracic endopod, rostral, details show a modified seta (B) of the propodus, and the rostral paradactylar seta (C); D, female tarsus 4, rostral, detail (E) as in (C); F, female tarsus 8, rostral, detail (G) as in (C, E); H, male tarsus 3, rostral, detail shows the rostral paradactylar seta (J); K, L, male rostral paradactylar setae of thoracic endopods 4 (K) and 8 (L); M – P, series of male pleopods 1 – 4, caudal (M, N) or rostral (O, P) view; Q, exopod of male pleopod 4 in lateral view, setae omitted; R, male pleopod 5, caudal; S, posterior margin of sixth pleonite, lateral; T, uropods, ventral; U, telson, dorsal; V, terminal portion of telson, dorsal.