Revision of the genus Ommatoiulus Latzel, 1884 (Julida, Diplopoda) in Portugal, with description of six new species Author Nesrine Akkari Author Henrik Enghoff text European Journal of Taxonomy 2017 295 1 42 journal article 36309 10.5852/ejt.2017.295 05d91344-43e4-4af4-9122-a850bc02b291 2118-9773 376203 urn:lsid:zoobank.org:pub:5862FED7-135E-4648-93D4-46EEC294997A Ommatoiulus alacygni sp. nov. urn:lsid:zoobank.org:act:11FBA7C7-2310-48BC-A33E-D469C97BFD3E Figs 1–3 Diagnosis Most similar to O. denticulatus sp. nov. and O. staglae sp. nov. , agreeing with these in having a very reduced mesomerite and a complex multi-branched solenomerite; differing from both in the shape of the solenomerite and the jagged coxa resembling, in posterior view, a swan wing. Etymology The species epithet is a composite Latin noun meaning “swan wing” and refers to the shape of the gonopod coxa. Material examined Holotype PORTUGAL: 1 ♂, Faro District, Algarve, Ferragudo, 7 Mar. 1981, D. Kime leg. (ZMUC). Paratype PORTUGAL: 1 ♀, same data as holotype. Description MEASUREMENTS. Male: L = 35 mm, H = 3 mm, 45 PR+1 AR+Telson. Female: L = 45 mm, H = 4.2 mm, 46 PR + 2 AR +Telson. COLOUR. Faded after 35 years in alcohol ( Fig. 1 ). Prozonites dark, greyish (perhaps originally deep brown); metazonites pale, almost whitish; dorsum with a thin black mid-dorsal line; legs pale brown to yellowish; head dark brown on the frontal part, paler towards the labral zone, mouthparts yellowish; preanal ring pale, anal valves blackish. Prozonites with oblique striae; metazonites with regular striation; suture complete, rectilinear but sometimes with a sinus at ozopore level. Anal valves with a marginal row of short setae, a submarginal row of longer ones, no setae (? broken) on disc. Subanal scale triangular, blunt and setose. Preanal ring with a protruding caudal projection bearing 2–3 setae on tip, no hyaline process (?broken). GONOPODS (Figs 2–3). Promerite (P) stout, basally parallel-sided in posterior view, twice as long as broad with a rounded lateral margin, distally gradually narrowing and ending in a narrow apical tip; mesal ridge (Mr) fairly broad, ending in a blunt process at mid-length of the promerite; posterior surface with a small concavity near the mesal ridge (lodging the mesomerite); rudimentary telopodite (T) small and located proximally near Mr ( Fig. 3 A). Posterior gonopod ( Figs 2 B–C, 3B–C): Mesomerite (Ms) reduced and very simple, less than half as long as the promerite; solenomerite (S) large, with an anterior long process (Sa) narrowing distad, apically tapering and bent posteriad, subapically bearing a triangular median hyaline lamella (Hl); seminal groove (g) running posteriorly from the fovea (F) located at the base of the solenomerite along a posterior acuminate process (Sp) and opening in 'og'; the solenomerite shows another thin and long process pointing laterad (Sl). Paracoxite (Px) large, twisted antero-laterad and extending beyond the rest of processes; distally abruptly expanding in a rounded bulge ( Fig. 2 C, E) then apically narrowing in a curved thin apex pointing anteriad; coxa (Cx) very prominent, angular and characterised by the presence of a jagged margin with three protruding blunt processes, in lateral view reminding of the wing of a swan ( Figs 2 C, 3C ). Fig. 1. Ommatoiulus alacygni sp. nov. Paratype ♀. habitus, lateral view. Fig. 2. Ommatoiulus alacygni sp. nov. Holotype ♂, gonopods. A . Right promerite, posterior view. B . Right posterior gonopod, mesal view. Line marking the broken paracoxite. C . Left gonopod, lateral view. D . Left gonopod, meso-posterior gonopod. E . Left gonopod, antero-lateral view. Fig. 3. Ommatoiulus alacygni sp. nov. Holotype ♂, gonopods. A . Right promerite, posterior view. B . Left gonopod, mesal view. C . Left gonopod, posterior view. Distribution South Portugal, Algarve, Ferragudo.