Ommatoiulus

Nesrine Akkari & Henrik Enghoff, 2017, Revision of the genus Ommatoiulus Latzel, 1884 (Julida, Diplopoda) in Portugal, with description of six new species, European Journal of Taxonomy 295, pp. 1-42 : 34-35

Identification Key to the Portuguese species of Ommatoiulus based on gonopod structures

1. Paracoxite deeply divided into 2 processes ( Fig. 15 D) ........................ O. lusitanus ( Verhoeff, 1895)

– Paracoxite not divided ...................................................................................................................... 2

2. Mesomerite reduced, almost half as long as the promerite ( Figs 2 C, D, 9D, 19B)........................... 3

– Mesomerite normal to large – sometimes extending beyond the rest of processes ( Figs 7 A, 13A). 5

3. Coxa or paracoxite with strong serrations ( Figs 2 D, 9D); promerite distally narrowed in a rounded apex; solenomerite with hyaline lamella ( Figs 2 E, C, 10)................................................................. 4

– Coxa and paracoxite with no conspicuous serrations; promerite uniformly broad; solenomerite without hyaline lamella ( Fig. 18 )...................................................................... O. staglae sp. nov.

4. Paracoxite distally expanded, leaf-shaped, and bearing strong serrations on the lateral margin ( Figs 9 D, F, 10B); coxa smooth and rounded; solenomerite with one accessory process .................. ....................................................................................................................... O. denticulatus sp. nov.

– Paracoxite distally narrowing, apically with a bulge followed by a pointed tip ( Figs 2 C, E, 3B), without serrations; coxa ‘swan wing-shaped’ with 3 blunt processes ( Figs 2 C–D, 3C); solenomerite with 2 accessory processes ( Fig. 3 C)................................................................... O. alacygni sp. nov.

5. Mesomerite shorter than promerite (e.g., Fig. 18 D); solenomerite with a broad lamella bearing notches and distal ramifications (e.g., Fig. 18 B) ............................................................................... 6

– Mesomerite as long as the promerite, sometimes extending beyond the rest of processes (e.g., Figs 13 A, 24A), solenomerite different, large species....................................................................... 8

6. Promerite with two postero-apical teeth, solenomerite with 3 notches and 4 slender to acuminate ramifications ( Fig. 23 B), mesomerite distally expanded mesolaterad ( Fig. 23 D)............................... .............................................................................................................................. O. stellaris sp. nov.

– Promerite with one or no apical teeth, solenomerite with one notch and one distal ramification, mesomerite uniformly broad, distally narrowing and curved ( Figs 4 C, 18B)................................... 7

7. Promerite with a strong apical tooth, solenomerite long and broad, distally narrower, with a subapical curved acuminate process and an apical subtriangular fold ( Fig. 4 C)................................................. ............................................................................................................. O. andalusius ( Attems, 1927)

– Promerite with no apical teeth ( Fig. 18 D), solenomerite short and broad, with two acuminate asymmetrical processes separated by a lamellar fold ( Fig. 18 B) ............ O. porathi ( Verhoeff, 1893)

8. Mesomerite strongly expanded into a large distal plate with spines and serrations, solenomerite simple ( Fig. 24A )...................................................................................... O. martensi Mauriès, 1969

– Mesomerite distally narrowing or bifurcating, solenomerite complex.............................................. 9

9. Solenomerite divided into 3 processes (a large anterior one, a median hyaline fold and an acuminate posterior one); paracoxite broad, distally expanding ( Fig. 5 B–C) .................................................. 10

– Solenomerite more complex, heavily serrated, with a furrow and other accessory branches ( Fig. 8 B); paracoxite slender or completely reduced ( Fig. 8 C)........................................................................ 12

10. Mesomerite with apical projections, paracoxite expanded, with several distal projections ............11

– Mesomerite without apical projections ( Fig. 14 A), paracoxite hammer-shaped ( Fig. 14 B) ............... ............................................................................................................................... O. litoralis sp. nov.

11. Promerite with an apical incision and a protruding mesal margin; paracoxite strongly curved ......... ............................................................................................ O. bipartitus ( Verhoeff, 1925) ( Fig. 24 B)

– Promerite with a regular margin and no apical incision .......... O. moreleti (Lucas, 1860) ( Fig. 24 C)

12. Mesomerite distally not bifurcated; paracoxite long slender and curved ( Fig. 24 E) .......................... .............................................................................................................. O. fuentei ( Brolemann, 1920)

– Mesomerite distally bifurcated; paracoxite short to very reduced ( Figs 7 D, 17B, 24D) ................ 13

13. Promerite strongly narrowed distally ( Figs 7 B, 8A), apex with a serrated mesal fold and a pointed lateral margin; mesomerite curved from basis and pointing mesad, both apical processes pointing in the same direction ( Figs 7 A, D, 8B).................................................................... O. camurus sp. nov.

– Promerite gently narrowed distally, apex with regular margins ( Figs 17 A, C, 24D); mesomerite curved from distal third, mainly pointing laterad ( Figs 17 B, D, 24D) ............................................ 14

14. Paracoxiteveryreducedwithtransversalstripes,mesomeritedistallywithalongcurvedprocesspointing laterad and a much shorter one pointing posteriad ( Fig. 24 D) ...... O. dorsovittatus ( Verhoeff, 1893)

– Paracoxite longer, mesomerite apically with subequal ramifications oppositely directed ( Fig. 17 B, D) .......................................................................................................... O. oliveirae ( Verhoeff, 1893)

Figures

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.

Fig. 4. Ommatoiulus andalusius (Attems, 1927), Aljezur, Portugal. A. ♀, habitus, lateral view. B. Male left posterior gonopod, mesal view. C. Male left posterior gonopod, posterior view.

Fig. 5. Ommatoiulus bipartitus complex, paracoxite. Posterior view. A. bipartitus type, ♂ from Leon. B. involutus type, ♂ from A Coruña, Galicia. C. lienharti type, ♂ from Arcachon, redrawn from Brolemann (1921). D. Unspecified type, ♂ from the Basque Country.

Fig. 7. Ommatoiulus camurus sp. nov. Holotype, ♂. A. Left gonopod, posterior view. B. Right promerite, posterior view. C. Right posterior gonopod, lateral view. D. Left posterior gonopod, mesal view.

Fig. 8. Ommatoiulus camurus sp. nov. Holotype ♂, gonopods. A. Right promerite, posterior view. B – D. Right posterior gonopod: B. Mesal view. C. Posterior view. D. Lateral view.

Fig. 9. Ommatoiulus denticulatus sp. nov. Holotype ♂. A. Head and anteriormost body-rings, lateral view. B. Telson, lateral view. C. Right gonopod, lateral view. D. Right gonopod, mesal view. E. Right gonopod, posterior view. F. Right gonopod, postero-lateral view.

Fig. 13. Ommatoiulus litoralis sp. nov. Paratype, ♂ from Algarve, gonopods. A. Left gonopod, mesal view. B. Left gonopod, lateral view. C. Right promerite, posterior view. D. Right posterior gonopod, postero-mesal view.

Fig. 14. Ommatoiulus litoralis sp. nov. A – B. Paratype, ♂ from Aljezur, right gonopod. A. mesal view. B. Disto-mesal view. C – D. Paratype, ♂ from Algarve, right gonopods. C. mesal view. D. lateral view.

Fig. 15. Ommatoiulus lusitanus (Verhoeff, 1895). A, C, E. ‘ Archiulus cingulatus ’ syntype (NHMW 3162). B, D, F. Schizophyllum (Eleutheroiulus) lusitanum, syntypes, slide preparation (ZMB 130856). A – B. Promerites, posterior view. C – D. Posterior gonopods, posterior view. E – F. Mesomerites, posterior view.

Fig. 17. Ommatoiulus oliveirae (Verhoeff, 1893). A – B. Syntype, slide preparation (ZMB 13086). A. Promerites, posterior view. B. Posterior gonopod, posterior view. C – D. Slide preparation (NHMW 8044). C. Promerites, posterior view. D. Posterior gonopods, posterior view.

Fig. 18. Ommatoiulus porathi (Verhoeff, 1893). A – B. Holotype ♂, Verhoeff’s slide preparation 1190, (ZMB). A. Right promerite, posterior view. B. Posterior gonopods. C – D. ♂ from Viseu, (NHMW 8736). C. Head and anterior rings, lateral view. D. Gonopods, posterior view.

Fig. 23. Ommatoiulus stellaris sp. nov. Paratype ♂. A. Left promerite, posterior view. B. Left posterior gonopod, mesal view. C. Left posterior gonopod, postero-mesal view. D. Left posterior gonopod, anterolateral view.

Fig. 24. A. Ommatoiulus martensi Mauriès, 1969, left gonopods. B. O. bipartitus (Verhoeff, 1925), left gonopods. C. O. moreleti (Lucas, 1860), left gonopods. D. O. dorsovittatus (Verhoeff, 1893), right gonopods. E. O. fuentei (Brolemann, 1920), left gonopods.