Lepidocyrtus (Acrocyrtus) postpallidus

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 : 118-119

Lepidocyrtus (Acrocyrtus) postpallidus nom. nov.

Figs 39–42 , Tabs 2–3

Trichogaster pallida Salmon, 1951 (in Salmon 1951a)

Setogaster pallidus (Salmon, 1951) (according to Salmon 1951b)

Lepidocyrtus pallidus (Salmon, 1951) comb. nov., non Lepidocyrtus pallidus Reuter, 1890 [homonymy]

Material examined. Holotype (J. T. Salmon Coll. Nº 34), SINGAPORE, McRitchie Reservoir, 1.330470N 103.829505E, 37m 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) 1.95 mm. Mesothorax slightly projecting over the head. Blue pigment present on antenna and pale blue dispersed on head, thorax, abdomen and legs (but see original description in Salmon 1951a); densely black pigmented ocular areas. 8+8 ommatidia, with G and H reduced.

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

Prelabral chaetae smooth. Labial chaetae M1 and R ciliated and shorter than other chaetae, other chaetae smooth (labial formula M1*m2R*el1l2).Ventral cephalic groove with 3+3 ciliated chaetae.

Dorsal macrochaetae formula such as AoA2s A2A3A4/00/0?00+2; dorsal cephalic macrochaetae as in Fig. 39 . Th.II–III without macrochaetae (micro/mesochaetae chaetotaxy not visible). Abd.I–II–III dorsal chaetotaxy not visible. Abd.III without a lateral tuft of filaments. Abd.IV chaetotaxy partially visible; B5, B6, D3, E2, E3, E4, F1, F2 and F3 broad macrochaetae; T6, T7 and Fe4 thin macrochaetae; bothriotrichumT2 without accessory chaeta s; chaetae a, m and D1 detached and only their insertions seen; C1 mesochaeta; without lateral pseudopori.

Ventral tube chaetotaxy and scale covering not visible. Legs with scales. Unguis with a basal pair of teeth at 32% of the inner edge, and with one inner tooth at 60% from base of inner edge; unguiculus acuminate and with serrate outer margin; spatulate tibiotarsal tenent hair.

Manubrium with scales on dorsal surface. Dental basal tubercle pointed and well developed ( Figs 40 and 41 ). Mucronal basal spine with spinelet ( Fig. 42 ).

Discussion. It was not possible to describe more details of the chaetotaxy of this specimen because of the state of the slide, but the presence of a well-developed and pointed dental tubercle permit to assign the specimen to the subgenus Acrocyrtus . After transfer of Trichogaster pallida Salmon to Lepidocyrtus genus, Lepidocyrtus pallidus (Salmon, 1951) comb.nov., the specific name ' pallidus ' is homonymic with Lepidocyrtus pallidus Reuter, 1890 . For this reason a new name is needed for the species transferred and Lepidocyrtus postpallidus nom. nov. is proposed for Salmon's species. Moreover, this species belongs to subgenus Acrocyrtus then the complete name of this species is Lepidocyrtus (Acrocyrtus) postpallidus (Salmon, 1951) .

Figures

FIGURES 39 – 42. Lepidocyrtus (Acrocyrtus) postpallidus. 39, dorsal head chaetotaxy, circles—ciliated chaetae sockets, lines—smooth mesochaetae; 40, man – manubrium, den – dentes, arrow pointing to dental tubercle; 41, dental tubercle detail; 42, mucro showing basal mucronal spine with spinelet.