Lepidocyrtus (Setogaster) kuakea Christiansen & Bellinger, 1992

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 : 119-121

Lepidocyrtus (Setogaster) kuakea Christiansen & Bellinger, 1992 comb. nov.

Figs 4 and 43–48 , Tabs 2–3

Material examined. One paratype on slide (code 6793). HAWAIIAN ISLANDS, Maui, Iao Valley State Park, 20.880864N 156.544622W, 284 m asl, 2.vii.1982, K. Christiansen, deposited at SAM.

Description. Body length (without head and furca) 0.45 mm. Mesothorax not projecting over the head. Body color yellow to mottled with blue, with pale blue on ant-II-III-IV and eye patches, and dark pigmented eyes and internal spot ( Fig. 4 ). Body dorsoventrally compressed. Antenna, legs, ventral tube and dorsal region of the furca without scales. Basis of ant.I dorsally and ventrally with three microchaetae arranged in triangle. Ant.III organ composed of two subcylindrical sensory rods partially covered by integumentary fold. Ant.IV with small subapical T-chaeta; without apical bulb.

Ciliated prelabral chaetae and smooth labral chaetae in typical number of 4/5,5,4; chaetae of apical row thicker than those in other rows. Closed inverted V-shaped labral apical intrusion. Lateral process ( sensu Fjellberg 1999 ) of outer labial papilla short, tip not reaching apex of papilla.

Dorsal macrochaetae formula such as AoA2s A2A4M 2/00/01 *00+3, with A4 as smooth short macrochaeta ( Fig. 43 ). Eyes and interocular chaetotaxy not seen (complete area darkly pigmented). Th.II–III and abd.I dorsal chaetotaxy the same as for S. nigrofasciatus (see Figs 19–21 ). Abd.II chaetotaxy as in Fig. 44 ; chaetae ml and a2p absent; chaeta a2 smooth mesochaeta; chaeta m3 short, ciliated macrochaeta (chaeta marked with * in the dorsal macrochaetal formula); m5 mesochaeta. Abd.III chaetotaxy as in Fig. 45 ; chaeta d3 absent; chaetae mi, ml, a2, li, lm, ll, a6, im, em fan-shaped, of which a6 and li larger (paddle-like); chaeta am6 strongly ciliated and thicker than other tergital mesochaetae; without lateral tuft of filaments. Abd.IV chaetotaxy as in Fig. 46 ; bothriotrichumT2 without accessory chaeta s; chaetae m, D1, pi and pe fan-shaped, of which m and D1 larger (paddle-like); chaeta a bilobed-fan-shaped (see Fig. 26 ); C1 mesochaeta; F2 and F3 smooth mesochaetae, with F3 double in length than F2; macrochaeta B6 with socket of minor diameter than macrochaetae B4 and B5; with at least two dorsal long Schaetae (region not clear on slide), with two lateral pseudopori located externally to chaetae r4–r5.

Trochanteral organ, unguis ( Fig. 47 ), ventral tube, and furca as original description (see Christiansen & Bellinger 1992), except for presence of spinelet in the basal mucronal spine ( Fig. 48 ); dentes with a little (difficult to observe) rounded basal tubercle.

Discussion. The presence of small rounded dental tubercle and spinelet on basal mucronal spine allow us to assign this specimen to the subgenus Setogaster. In the original description of the species Christiansen & Bellinger (1992) described the mucronal basal spine without spinelet, but it was a misinterpretation of the holotype (Christiansen pers com) and the spinelet is clearly present.

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 43 – 48. Lepidocyrtus (Setogaster) kuakea. 43, dorsal head chaetotaxy, circles—ciliated chaetae sockets, linessmooth chaetae; 44, abd. II complete chaetotaxy (left side), pse—pseudoporus; 45, abd. III complete chaetotaxy (left side), circles—ciliated macrochaetae, pse—pseudoporus; 46, 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, chaetae morphology as Fig. 25 - b; 47, third leg apex with unguis and unguiculus; 48, mucro showing basal mucronal spine with spinelet.

FIGURES 19 – 21. Lepidocyrtus (Setogaster) nigrofasciatus. 19, th. II dorsal chaetotaxy (left side), pse—pseudoporus, circles – ciliated chaetae; 20, th. III dorsal chaetotaxy (left side)), pse—pseudoporus; 21, abd. I dorsal chaetotaxy (left side), psepseudoporus.

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.