Lepidocyrtus (Setogaster) fasciatus (Salmon, 1951) Salmon, 1951

Mateos, Eduardo & Greenslade, Penelope, 2015, Towards understanding Lepidocyrtus Bourlet, 1839 (Collembola, Entomobryidae) I: diagnosis of the subgenus Setogaster, new records and redescriptions of species, Zootaxa 4044 (1), pp. 105-129 : 115-118

Lepidocyrtus (Setogaster) fasciatus (Salmon, 1951) comb.nov.

Figs 5 , 36–37 , Tabs 2–3

Trichogaster fasciata Salmon, 1951 ( Salmon 1951a)

Setogaster fasciatus (Salmon, 1951) (according to Salmon 1951b, in Salmon 1964) Material examined. Holotype (J. T. Salmon Colln Nº 36). SINGAPORE, McRitchie Reservoir, 1.330470N 103.82950E, 37 m asl, 22.x.1949, among fibrous roots and dead vegetation, M.W.F. Tweedie, Te Papa Museum, Wellington, New Zealand.

Description. Body length (without head and furca) 0.82 mm. Mesothorax not projecting over the head. Body dorsoventrally compressed with dark blue pigment present on ant.I–IV, along edges of thoracic terga, dorsolaterally around posterior half of abd.II, the entire of abd.III, V and VI; abd.IV with violet shading laterally and dorso-posteriorly; densely black pigmented ocular areas ( Fig. 5 ).

Antenna without scales. Antennal chaetotaxy not visible; without apical bulb.

Ciliated prelabral chaetae. Labial anterior row formed by five smooth chaetae (a1–a5); posterior row formed by ciliated chaetae with formula M1M2?EL1L2; chaeta R not visible (marked with?). Ventral cephalic groove with 3+3 ciliated chaetae.

Dorsal macrochaetal formula as AoA2s A2A4???/00/0??0+3. Cephalic chaetae of rows M and S not visible; A3 mesochaeta, A4 macrochaeta.Th.II–III without macrochaetae (micro/mesochaetae chaetotaxy not visible). Abd.I– II–III dorsal chaetotaxy not visible. Abd.III with a lateral tuft of ±100 long ciliated filaments ( Fig. 36 ). Abd.IV macrochaetotaxy as in L. (S.) nigrofasciatus (see Fig. 25 ); on bothriotrichum T2 complex chaetae a and D1 detached and only insertions visible, but chaeta m present as paddle-like fan-shaped morphology (as in L. (S.) nigrofasciatus , see Fig. 26 ); with two lateral pseudopori located external to chaetae r4–r5.

Ventral tube and legs without scales. Unguis with a highly developed basal pair of teeth at 16% of the inner edge, and with one small inner tooth at 90% from the base of inner edge; unguiculus truncate; spatulate tibiotarsal tenent hair ( Fig. 37 ).

Manubrium without scales on dorsal surface; dental basal tubercle not visible (or absent); mucronal basal spine with spinelet.

Discussion. It was impossible to describe more details of the chaetotaxy of this specimen because of the state of the slide, but the characters observed allow us to assign the specimen to the subgenus Setogaster.

Figures

FIGURES 1 – 8. Lepidocyrtus (Setogaster) studied. 1 – 2, L. (Setogaster) nigrofasciatus; 3, L. (Setogaster) praecisus; 4, L. (Setogaster) kuakea; 5, L. (Setogaster) fasciatus; 6, L. (Setogaster) coerulea; 7 – 8, L. (Setogaster) spp.

FIGURES 36 – 38. Lepidocyrtus (Setogaster) fasciatus and L. (S.) postcaeruleus. 36, L. (S.) fasciatus abd. III lateral tuft of filaments; 37, L. (S.) fasciatus third leg apex with unguis and unguiculus. 38, L. (S.) postcaeruleus third leg apex with unguis and unguiculus.

FIGURES 25 – 26. Lepidocyrtus (Setogaster) nigrofasciatus. 25 a, abd. IV complete chaetotaxy, broad black circles—broad ciliated macrochaetae, small black circles—thin ciliated macrochaetae, open circles— mesochaetae, triangles—fan-shaped chaetae, S—long S-chaetae, as and ps—short S-chaetae, x—bothriotricha, # — pseudoporus; 25 b, abd. IV chaetae morphology, bcm—blunt broad ciliated macrochaeta, tcm—acuminate thin ciliated macrochaeta, m—mesochaeta; 26, abd. IV bothriotrichal complex.