DISCOSOMATICINI ROEWER, 1923

Medrano, Miguel, Kury, Adriano Brilhante & Mendes, Amanda Cruz, 2022, Morphology-based cladistics splinters the century-old dichotomy of the pied harvestmen (Arachnida: Gonyleptoidea: Cosmetidae), Zoological Journal of the Linnean Society 195, pp. 585-672 : 620-621

TRIBE DISCOSOMATICINI ROEWER, 1923 STAT. DEM.

Discosominae Pickard-Cambridge, 1904: 549. Nomen permanently invalid, being based on a genus nomen preoccupied by Discosoma Rueppell & Leuckart, 1828 (Cnidaria) .

Discosomaticinae Roewer, 1923: 388 .

Diagnosis: Small and delicate cosmetids with long and unarmed legs ( Figs 42B , 46B ). Area III of mesotergum may be unarmed ( Fig. 46C, D ), bear acuminated spines ( Marronia ) or high, rounded tubercles ( Kayania , Fig. 24D, E ). Area I with small, rounded tubercles, sometimes coloured ( Fig. 33B ). Other areas may be unarmed or with paramedian, low, yellow tubercles. DS rounded in dorsal view (delta-type) and lenticular in lateral view ( Fig. 42A, C ), constriction between carapace and abdomen not well marked (= constriction C1, Fig. 5A ). Chelicerae monomorphic without basal spine in movable finger ( Fig. 43E ). Yellowish spots (if present) are mostly restricted to four dots in areas I and III, and as marginal stripes in DS ( Figs 35A , 42A ). Lateral part of coxa IV sometimes with yellowish markings (from dots to stripes, Figs 33B , 44C ). Bipectinate claws in legs III and IV, ( Figs 32E, F , 36H, I ). Basitarsomeres slightly enlarged in males, but not inflated.

Type genus: Discosomaticus Roewer, 1923 (a junior subjective synonym of Sibambea ).

Included genera: Paraprotus Roewer, 1912 ; Protus Simon, 1879 ; Sibambea Roewer, 1917 ; Kayania Medrano, Kury & Mendes gen. nov. and Marronia Medrano, Kury & Mendes gen. nov.

Remarks: The original name of the type genus Discosoma Perty, 1833 was pre-occupied by a genus of cnidarians, therefore, Roewer proposed the replacement name Discosomaticus Roewer, 1923 and at the same time he proposed the new replacement name Discosomaticinae for the subfamily (ICZN Art. 39; Kury, 2018).

Figures

Figure 5. Examples of some characters defined by us and used in the present phylogenetic analysis.

Figure 24. Kayania bicolumnata, male holotype (SMF 12782/16). A, dorsal view. B, ventral view. C, distal part of the penis emerging through genital operculum. D, habitus, lateral view. E, postero-lateral view. F, original labels by Weyrauch and Roewer. Scale bars: 1 mm. Photos courtesy Abel Pérez.

Figure 32. SEM images of some structures of Protus bolivari, male (USNMENT 01538074). A–D, penis: A, dorsal view; B, lateral view; C, ventral view; D, detail of stylus, oblique view. E–F, right claw IV: E, ventral view; F, ventro-lateral view. Scale bars: 50 μm (A–C), 20 μm (D, F), 100 μm (E).

Figure 33. Protus distinctus, male (CAS AK 105).A, dorsal view. B, lateral view. C, panoramic dorsal view.Scale bars: 1 mm.

Figure 35. Protus insolens, male holotype (MNHN ES 03021). A, dorsal view. B, panoramic dorsal view. C, ventral view. D, frontal view. E, posterior view. F, lateral view. G, penis, dorsal view. H, same, lateral view. Scale bars: 1 mm. Abbreviation: MS = macrosetae.

Figure 36. SEM images of some structures of Protus insolens, male (MPEG 867). A–C, lenis: A, dorsal view; B, lateral view; C, ventral view. D. Left basichelicerite, dorsal view. E, left cheliceral hand, dorsal view. F, left pedipalpal tarsus, ventral view. G, left pedipalpus, mesal view. H, left claw IV, ventral view. I, left claw III, ventro-lateral view. Scale bars: 100 μm (A–C, F, H, I), 200 μm (D, E), 500 μm (G).

Figure 42. Sibambea cincta, male (MPUJ_ENT 644772). A, dorsal view. B, panoramic dorsal view. C, lateral view. D, posterior view. E, ventral view. Scale bars: 1 mm.

Figure 43. SEM images of some structures of Sibambea cincta, male (ICN-Ao- 972). A–D, penis: A, dorsal view; B, lateral view; C, ventral view; D, detail of stylus and dorsal process of glans. E, left cheliceral hand, dorsal view. F, left basichelicerite, dorsal view. G, left pedipalpus, ectal view. H, same, mesal view. I, same, detail of tarsus, ventral view. Scale bars: 50 μm (A–C), 10 μm (D), 200 μm (E, G, H), 100 μm (F, I).

Figure 44. Sibambea rotunda, male (CAS AK 003). A, dorsal view. B, lateral view. C, panoramic dorsal view. Scale bars: 1 mm.

Figure 46. Sibambea waorani, male holotype (QCAZ AK 156). A, dorsal view. B, panoramic dorsal view. C, posterior view. D, lateral view. Scale bars: 1 mm.