Schiodtella Signoret, 1882

Imura, Jimpei & Ishikawa, Tadashi, 2009, A review of Schiodtella formosana, with some remarks on the genus Schiodtella and description of a Japanese new species (Hemiptera: Heteroptera: Cydnidae), Zootaxa 2315, pp. 19-30 : 20-21

The genus Schiodtella Signoret, 1882

Schiodtella Signoret, 1882: 218 , type species by subsequent designation ( Lis 1994: 25): Stibaropus tabulatus Schiødte (syn. by Lis 1994: 24, with Stibaropus Dallas, 1851 ; restored by Lis 1999: 128).

Neostibaropus Takano and Yanagihara, 1939: 135, type species by monotypy: Neostibaropus formosanus Takano and Yanagihara (syn. by Esaki & Ishihara 1951: 30, with Stibaropus Dallas, 1851 ; by Lis 1991a: 169, with Schiodtella Signoret, 1882 ).

Lis (1991a) synonymized Neostibaropus with Schiodtella chiefly on the basis of having the four-segmented antennae, and afterwards, diagnosed the latter as “Head narrowed anteriorly, crenulated on margins; paraclypei with peg-like setae; clypeus parallel-sided or narrowed apically, shorter than paraclypei; antennae 4-segmented, second segment as long as or longer than the third; second rostral segment simple, without foliaceous lobe; apex of peritreme with small tooth-like process; margin of abdominal sternites straight in lateral parts; tarsi of all leg present” (Lis 1999). In addition to these characters, the 1+1 abdominal trichobothrial formula on the sternites III to VII is of taxonomic value for Schiodtella as documented by Lis and Hohol-Kilinkiewicz (2001). As Neostibaropus is clearly ascertained to have no tarsi, although it has almost all characters above, it is tempting to restitute Neostibaropus from the synonymy as a valid genus. However, we believe that maintainance of Neostibaropus as a synonym of Schiodtella , based on a careful survey on the comprehensive morphology among the species of Schiodtella and its allies (see below for the detailed discussion), should be kept. Herein we provide a modified diagnosis for Schiodtella , and add some characters that are important to define it.

Diagnosis. Head narrowed anteriorly, crenulated by fringe of peg-bearing tubercles on paraclypeal margin; clypeus parallel-sided or narrowed apically, shorter than paraclypei, with 2 subapical pegs. Antennae 4-segmented; segment II as long as or longer than segment III. Rostral segment II simple, without foliaceous lobe. Apical process of peritreme usually tooth-like, variable in length, but sometimes lacking. Tarsi present or absent. Posterior margin of abdominal sterna not insinuated; trichobothrial formula 1+1 on sternites III to VII ( Fig. 21 ). Penis with conjunctival appendage of various lengths; spermathecal duct with large, globate, distinctly pigmented dilation.

Figures

FIGURE 17 – 21. Schiodtella formosana. 17, dorsal aspect; 18 – 19, head, dorsal (18) and lateral (19) views; 20, left evaporatorium; 21, left side of abdominal sterna III – VII, lateral view. Abbreviations: Sp, spiracle; Trb, trichobothrium. Scales: 1.0 mm for 17 & 21, 0.5 mm for 18 – 20.