Acanthocyrtus, Handschin, 1925

Cipola, Nikolas Gioia, Morais, José Wellington De & Bellini, Bruno Cavalcante, 2018, New species, redescriptions and a new combination of Acanthocyrtus Handschin, 1925 and Amazhomidia Cipola & Bellini, 2016 (Collembola, Entomobryidae, Entomobryinae), Zootaxa 4387 (3), pp. 401-435 : 431-432

Key to Acanthocyrtus species (adapted from Zhang et al. 2009)

1 Tenent hairs pointed; Ruanda-Urundi................................................ A. marginalis Salmon, 1956

- Tenent hairs clavate (as in Fig. 20E )....................................................................... 2

2 Dorsal head with 8 sutural mac; Th II with 26–33 posterior mac; mucronal proximal tooth clearly smaller than distal, mucronal basal spine surpassing the proximal tooth; Australia.................................... A. barrowensis Zhang, 2009

- Dorsal head with 7 or less sutural mac ( Fig. 25A ); Th II with up to 19 posterior mac; mucronal teeth subequal, mucronal spine

reaching the apex of proximal tooth ( Fig. 24E ).............................................................. 3 3 Th II with 4–11 posterior mac, labial basomedian field without chaeta M2 ( Fig. 25B )................................ 4

- Th II with 14–19 posterior mac, labial basomedian field with chaeta M2 .......................................... 5

4 Dorsal head with 5 sutural mac; Th II with 4 posterior mac, m1 mac absent; Abd I with two mac (m3–4); Australia......................................................................................... A. spinosus (Schött, 1917)

- Dorsal Head with 7 sutural mac ( Fig. 25A ); Th II with 8–11 posterior mac, m1 mac present ( Fig. 26A ); Abd I with four mac (m2–5) ( Fig. 26B ).............................................................. A. lineatus Womersley, 1934

5 Dorsal head regions Gr I and II with 1+1 and 5 mac respectively; labial basomedian field with one reduced chaeta (M2); Australia.......................................................... A. yolngui Zhang, 2009 (in: Zhang et al. 2009)

- Dorsal cephalic regions Gr I and II with 2+2 and 4 mac respectively; labial basomedian field with three reduced chaetae (M2, R and RS); Australia............................................. A. loftyensis Zhang, 2009 (in: Zhang et al. 2009)

Figures

FIGURE 20A–H. Amazhomidia guianiensis comb. nov.: A, SUbcOXA I; B, SUbcOXA II; C, SUbcOXA III (OUTER SIDE); D, TROchANTERAL ORGAN (POSTERIOR SIDE) AND ANTERIOR SPINE-LIKE chAETAE; E, DISTAL TIbIOTARSUS AND EMPODIAL cOMPLEX III (POSTERIOR VIEW); F, MANUbRIUM VENTRO-DISTAL chAETOTAXY;G, MANUbRIUM DORSO-DISTAL chAETOTAXY;H, DORSO-PROXIMAL DENS (RIGhT SIDE).

FIGURE 24A–E. Acanthocyrtus lineatus: A, SYNTYPE MALE ON SLIDE (I.22555/SAM); B, RIGhT ANT I (DORSAL VIEW); C, hEAD AND ANTERIORPART Of Th II (LATERALVIEW),ARROW INDIcATES cILIATE MAc APIcALLY fOOT-ShAPED;D, LATERAL chAETOTAXY Of AbDIV (LEfTSIDE), T2 AND T4 IS bOThRIOTRIchA,ARROWS INDIcATES AccESSORY fAN-ShAPED chAETAE; E, DISTAL DENS AND MUcRO (LATERAL VIEW).ScALE bARS: C (0.1 MM), B, D‒E (0.02 MM).

FIGURE 25A–C. Acanthocyrtus lineatus: hEAD; A, DORSAL cEPhALIc chAETOTAXY; B, chAETOTAXY Of MAXILLARY OUTER LObE AND SUbLObAL PLATE, PROXIMAL chAETAE Of LAbIAL PALP, bASOMEDIAN AND bASOLATERAL LAbIAL fIELDS AND ANTERIOR POSTLAbIAL chAETAE; C, LAbIAL PALP PAPILLA E (RIGhT SIDE),L.P.IS LATERAL PROcESS.

FIGURE 26A–C. Acanthocyrtus lineatus: DORSAL chAETOTAXY;A, Th II AND III; B, AbDI‒III; C, AbD IV.