Dimorphacanthella mediaseta
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Genus: Dimorphacanthella
Name
Dimorphacanthella mediaseta Potapov, Mikhail B., 2010 – Wikispecies link – Pensoft Profile
- Dimorphacanthella mediaseta Potapov, Mikhail B., 2010, ZooKeys 73: 18-20.
Description
Description. Size of adult males and subadult females up to 1.0 mm (adult female not seen). Body shape slender, general appearance somewhat that of the genus Stenaphorura (Absolon, 1900) (Onychuridae). No pigmentation. Body with well visible reticulation, no elongated polygons. With 4 strongly chitinized anal spines arranged almost in one transversal row at the end of abdomen. Inner anal spines 1.1-1.4 times longer then outer spines. Ocelli absent. PAO narrowly elliptical, with weak constriction, 1.8-2.2 as long as unguis 3. Outer mouth parts as in previous species, labial palp shown in Fig. 9. Maxillary claw strong, lamellae not beyond its tip. Ventral side of a head with 3+3 postlabial setae. Ant. I with 11 (rarely with 10) setae, 2 bms, dorsal and ventral, and 2 ventral s, one of them curved and 3-4 times longer than another. Ant. II normally with 17 setae, 3 bms and one curved s. Ant. III without bms and with 5 s, inner pair of sensilla of AO much shorter and set in cuticular groove (Fig. 8). Several differentiated sensilla on Ant. IV, subapical organite small, subapical microsensillum short. Chaetotaxy of body shown on Figs 10-11. Tergal sensilla well visible, much shorter than ordinary setae. Sensillary formula 2,1/1,1,1,2,4 (s). In one individual 2 sensilla on one side of Th. III. Sensilla thinner than ordinary setae, on Abd. V sensilla of lateral pair thin and twice as long as the medial ones. Microsensilla large, set near sensilla, microsensillary formula 1,0/0,0,1 (ms). Tergites with a sparse cover of ordinary setae. Dorsal axial chaetotaxy of Th. II-Abd. IV as 12(14),10(9)/8,8,8,7 (including macr osetae Md). Macrochaetotaxy 1,1/2+1,2+1,2+1,4. In axial group of Abd. I-III a pair of small Md macroseta present (notated as '+1' in formula and encircled on Fig. 10). Short Md macroseta appears to be also present in axial group of Th. II and III but hardly differentiated. Ml macroseta on Th. II 2.6-3.1 as long as p1-seta. Md macroseta on Abd. IV 1.7-2.2 as long as p0-seta and 2.5-3.3 as long as unguis 3. Sternum of Th. I without setae, sternums of Th. II and III with 1+1 and 3(2)+3(2) setae, respectively. Unguis without inner and lateral teeth. Unguiculus simple, without lamella, 0.4-0.5 as long as unguis 3. Ti. I-III with 21, 21, 22 setae, without additional setae (Fig. 12). Only one seta slightly modified on inner side of Ti. III in both sexes. Tibiotarsal tenent setae weakly developed. Ventral tube with 4+4 laterodistal and 4 posterior setae in one transversal row. Ventrum of Abd. I with four medial setae, two anterior and two posterior. Furca and tenaculum completely absent. Furcal subcoxa with 9-11 setae, of which two longer setae, macrosetae in posterior position and anterior slightly enlarged seta (Fig. 13). Manubrial field normally with 3 pairs of setae. Retinacular field with 2 setae. Each anal lobe with 2 rudimentary setulae, not always distinct. Males present.
Taxon Treatment
- Potapov, Mikhail B.; Bu, Yun; Huang, Cheng-Wang; Gao, Yan; Luan, Yun-Xia; 2010: Generic switch-over during ontogenesis in Dimorphacanthella gen. n. (Collembola, Isotomidae) with barcoding evidence ZooKeys, 73: 18-20. doi
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