Ceratophysella cf. adexilis Stach, 1964

Jiang, Jigang, Yin, Wenying, Chen, Jianxiu & Bernard, Ernest C., 2011, Redescription of Hypogastrura gracilis, synonymy of Ceratophysella quinidentis with C. duplicispinosa, and additional information on C. adexilis (Collembola: Hypogastruridae), Zootaxa 2822 (1), pp. 41-51 : 46-47

publication ID	https://doi.org/ 10.11646/zootaxa.2822.1.2
DOI	https://doi.org/10.5281/zenodo.5294242
persistent identifier	https://treatment.plazi.org/id/03B287DD-FFFB-FD6A-F582-FB4D8CBC582E
treatment provided by	Felipe
scientific name	Ceratophysella cf. adexilis Stach, 1964
status

Treatment

Ceratophysella cf. adexilis Stach, 1964 View in CoL

Figs 4 View FIGURE 4 , 5 View FIGURE 5

Material examined. Six females and 2 males on slides, many in alcohol, Nanjing City: Qingliangshan Park, in soil under a pile of tiles. Collection number C9462, deposited in Nanjing University

Remarks on Chinese specimens. Body length up to 1.6 mm, color violet-black. Dorsal body granules moderately fine, coarser on most of Abd. V; dorsum of Abd. V with 13–15 granules between p 1 setae.

Body setae well differentiated ( Figs 4A, B View FIGURE 4 ), Type A. Th. I with 3+3 setae. Th. II with three rows of setae, as a 1– 2, 4–6, m 1, 5–7 and p 1–6. Th. III with three rows of setae, as a 1–6, m 1, 3, 5–7 and p 1–6; m 7 and p 4 sensilliform ( Fig. 4A View FIGURE 4 ). Abd. I – III each with 3 rows of setae, as a 1–3, m 3–4, 6 and p 1–6; a 2 ’ seta present. Abd. IV with 3 rows of setae, a 1 absent. Abd. V with 2 rows of setae, p 3 sensilliform .

Antenna shorter than diameter of head. Ant. III sense organ composed of two short rods located in small grooves and two blunt sensory hairs ( Fig. 5E View FIGURE 5 ). Eversible sac strongly developed. Ant. IV ventrally with weakly developed sensory field of ten pointed file setae ( Fig. 5F View FIGURE 5 ). Ant. IV dorsally with seven sensilla ( Fig. 5E View FIGURE 5 ). Seta i, subapical vesicle (os) and microsensillum (ms) present. Apical bulb bilobed.

Postantennal organ typical for the genus ( Fig. 5A View FIGURE 5 ), occasionally with irregular lobes ( Fig. 5B View FIGURE 5 ), 2–2.5× diameter of neighbouring ocellus. Accessory tubercle finely granulated and rounded ( Figs 5A, B View FIGURE 5 ). Labrum with granules on corpus, without rounded apical papillae, setae formula 4/5, 5, 4. Maxilla ( Fig. 5C View FIGURE 5 ) with 6 lamellae, lamella 1 longer than maxillary teeth, with coarse denticles and apical third with thickened marginal filaments; lamellae 2 and 3 with long marginal filaments; lamella 4 with denticles, ventrally with shorter filaments or longer denticles; lamella 5 with denticles and dorsally with short filaments). Maxillary outer lobe with one sublobal hair ( Fig. 5D View FIGURE 5 ).

Unguis with distinct inner mid-ventral tooth; lateral teeth minute or not visible ( Fig. 5G View FIGURE 5 ). Unguiculus almost half length inner side of unguis, with broad, rounded basal lamella and short apical filament. Tibiotarsal tenent hair as long as unguis, acuminate. Tibiotarsi I–III respectively with 19, 19, 18 setae.

Ventral tube with 4+4 setae, tenaculum with 4+4 teeth. Furca well developed. Ratio of manubrium:dens:mucro 1.7–2.2:1.8–2.1:1. Dens dorsally finely granulated, with 7 setae, 2 inner apical setae slightly thicker than other setae ( Fig. 4C View FIGURE 4 ). Mucro boat-like, rounded at tip, with well-developed outer lobe ( Fig. 4C View FIGURE 4 ). Anal spines long, slightly curved, pale yellowish, located on high papillae touching at their bases. Anal spines + papillae longer than inner side of unguis.

Discussion. We tentatively apply the name adexilis to these specimens, but the status of the species itself is uncertain as it cannot reliably be distinguished from several congeners (see Jia et al. 2010). Ceratophysella adexilis was described from the vicinities of Beijing and Nanjing. It has type A chaetotaxy and belongs to the C. denticulata group. Information on body length and pigmentation is lacking in the original description. According to the original description, the submedian and lateral macrosetae of all terga are smooth and very long ( Stach 1964). However, Babenko et al. (1994) pointed out that some type specimens of C. adexilis had serrated macrosetae. Therefore, specimens collected from Qinglianshan Park in Nanjing City are consistent with characters of the type description. Ceratophysella adexilis is very similar to C. communis (Folsom) , but their relationship to each other cannot be clarified until type specimens of the many similar species are comparatively examined (Jia et al. 2010).

Distribution. Nanjing, Beijing ( Stach 1964).