Arrhopalites antrobius Yosii, 1954: 68­69, 1967

Zeppelini, Douglas, 2004, The genus Arrhopalites (Collembola, Arrhopalitidae) in Asia, with the description of two new Japanese species of Yosiis collection, Zootaxa 430 (1), pp. 1-26 : 4

Arrhopalites antrobius Yosii, 1954: 68­69 , fig. 42­48.

Arrhopalites antrobius: Yosii, 1967: 64­66 , fig. 3.

Material examined: Lectotype ♀ and 1 paralectotype ♀, 12­iv­1965. JAPAN, Yamaguchi, Akiyoshi. Yakujindo cave . Yosii leg., MHN.

Caecus­group ( Fig. 2 , A­K). Body setae as shown in figure D. Antennae of lectotype ~ 2X as long as the cephalic diagonal. Ant. IV with five ringed subdivisions (Fig. A) apex with a capitate sense rod (Fig. B).

Ant. III without basal swelling; sense organ (Fig. C) with 2 parallel sense rods in a single shallow pit; seta Aai club­shaped and blunt; Api slender with a bristle like apex, Ape short and acuminate; Ae, Ap and Ai as a normal elongate setae. 1+1 eyes, pigments absent. Dorsal cephalic setae L1, L2, IL2 and IL3 spinelike, M3­5 absent (Fig. J). Metatrochanteral organ (seta D2) elongate (Fig. G). All ungues with a strong tunica and clear inner tooth (figs. K, a­c). All unguiculi with a strong corner tooth, and apical filament exceeding unguis tip. Corpus tenaculum with two setae (Fig. H). Dens with 7 dorsal E setae, E1­5 spinelike; four spinelike L setae present; D1­2 and Id1­4 present (Fig. E); 5 ventral setae rows (3,2,1,1,1) (Fig. E). Mucro narrow, gutter­like, both edges serrate narrowing at the distal third (Fig. F). Anal valve with 3+3 short cuticular spines in the upper flap and 2+ 2 in the ventral flaps; setae C2­C8 (but C7) swollen basally and lamellate, C7 slender, E10­11 absent, chaetotaxy (Fig. I). Female subanal appendage rod­like, somewhat flattened on apical half and apically serrate (Fig. I).

Biogeographic zone 3a.

Remarks: This species can be distinguished from other Asian caecus­group species by the number of subsegments of the Ant. IV and the presence of dental L4 seta.

Figures

FIGURE 2. A. antrobius. A, fourth antennal segment; B, apical subsegment of fourth antennal segment; C, apical sensory organ of third antennal segment; D, body setae (a, anterior, b, posterior); E, ventral and dorsal chaetotaxy of the dens; F, mucro; G, metatrochanteral organ; H, tenaculum; I, anal valve chaetotaxy; J, posterior cephalic chaetotaxy; K, foot complex (a, first leg, b, second leg, c, third leg).