Acanthocyrtus Handschin, 1925

Cipola, Nikolas Gioia & Greenslade, Penelope, 2022, Two new species of Acanthocyrtus Handschin, 1925 (Collembola, Entomobryidae Entomobryinae) from Western Australia, Zootaxa 5124 (3), pp. 341-358 : 343

Genus Acanthocyrtus Handschin, 1925

Type species: Acanthocyrtus spinosus ( Schött, 1917)

These characters are shared by all Acanthocyrtus species so are not repeated in the species descriptions following: Tergal mac heavily ciliate apically, strongly or lightly foot-shaped or acuminate; smooth mic apically ramificate or not ( Fig. 1 ). Eyes 8+8 ( Figs 3F and 9D ). Four prelabral chaetae smooth ( Fig. 3D ); labral formula with 4 (a1–2), 5 (m0–2), 5 (p0–2) smooth chaetae. Labial palp with five main papillae (A–E) plus one hypostomal papilla (H) with 0, 5, 0, 4, 3 (e6 absent), 2 guard appendages, respectively. Sublobal plate with 4 smooth appendages, 3 inner subquals and 1 minute distally ( Fig. 4B ). Labium with 5 proximal chaetae smooth and subequals in length ( Fig. 4C ). Basolateral and basomedian labial field with chaetae a1–5 smooth ( Fig. 4C ). Th II–Abd V with ms and sens formula 1, 0| 1, 0, 1, 0, 0 and 2, 2 | 1, 2, 2, +, 3, respectively ( Figs 5 and 10 ); Abd II–IV bothriotrichal formula 2 (a5, m2), 3 (a5, m2, m5), 2 ( T 2, T 4) ( Figs 5 and 10 ); bothriotricha with accessory lance-shaped chaetae ( Fig. 1 ). Mucro bidentate, apical tooth subequal to proximal tooth, basal spine surpassing the apex of the proximal tooth ( Fig. 7E ).

Figures

FIGURE 1. Symbols used in the chaetotaxy descriptions of Acanthocyrtus species.

FIGURE 3A–F. Acanthocyrtus necropolitanus sp. nov., antennae and dorsal head; A, apex of left Ant IV (dorsal view); B, Ant III distally (lateral view); C, chaetotaxy (mac and elongated sens) of left Ant III–I (dorsal view, from left to right), respectively; D, chaetotaxy of clypeus and prelabrum; E, labral papillae (ventral view); F, head dorsal chaetotaxy and eyes (dorsal view, left side).

FIGURE 4A–D. Acanthocyrtus necropolitanus sp. nov., ventral head (right side); A, labial papillae E (right side); B, maxillary palp and sublobal plate (right side); C, basomedian and basolateral labial fields and proximal chaetae; D, complete postlabial chaetotaxy.

FIGURE 5A–C. Acanthocyrtus necropolitanus sp. nov., dorsal chaetotaxy (left side); A, Th II–III; B, Abd I–III; C, Abd IV–V.

FIGURE 7A–E. Acanthocyrtus necropolitanus sp. nov., abdominal appendages; A, collophore (lateral view); B, distal manubrium (ventral view); C, manubrial plate (dorsal view), arrow indicates chaeta present or absent; D, dens spines chaetotaxy (dorsal view), E, distal dens and mucro (dorsal view).

FIGURE 9A–F. Acanthocyrtus pallidus sp. nov., antennae and head; A, chaetotaxy (mac and elongated sens) of left Ant III–I (dorsal view, from left to right), respectively; B, chaetotaxy of clypeus (dorsal view); C, labral papillae (ventral view); D, head dorsal chaetotaxy and eyes (dorsal view, left side); E, labial papillae E (ventral view, right side); F, complete postlabial chaetotaxy (ventral view, right side).

FIGURE 10A–C. Acanthocyrtus pallidus sp. nov., dorsal chaetotaxy (left side); A, Th II–III; B, Abd I–III; C, Abd IV–V.