Testudinella zhujiangensis Wei, De Smet & Xu 2010

Wei, Nan, De, Willem H. & Xu, Runlin, 2011, Two new brackish-water species of Testudinella (Rotifera: Testudinellidae) from Qi’ao Island in the Pearl River estuary, China, with a key to marine and brackish-water Testudinella, Zootaxa 3051, pp. 41-56 : 51

Testudinella zhujiangensis Wei, De Smet & Xu 2010

( Figs 6 C, 12–14)

Redescription of trophi. Trophi malleoramate ( Figs 12 , 13 ). Frontal latero-ventral margins of rami with a large, quadratic and stout reinforced, caudally recurved alula ( Figs 12–14 : al). Median rami apophyses ( Fig. 12 B: ra) weakly developed. Inner margins distal rami sections bearing 14–21/13–21 strongly webbed arched rami scleropili ( Figs 12 B, 14A: as). Frontal rami scleropili with fairly acute distal tip ( Fig. 14 B: fs). Basal apophyses moderately developed ( Fig. 13 : ba). Fulcrum short with a distinct proximal opening frontally ( Fig. 13 : fo). Unci plates ( Fig. 12 A: u) consist of 11–13/11–12 weakly curved and strongly webbed teeth. Each uncus has 3, occasionally 4, major teeth with moderately offset lanceolate heads. Minor teeth with lanceolate head bearing two minute lateral knobs at their base; the webbing almost extends up to the base of the heads. Crescent-shaped manubria are composed of a superimposed dorsal, median, ventral and small sub-ventral chamber ( Fig. 12 B).

Measurements. Trophi (N = 6): length × width 17.4–20.4 × 22.4–24.5 µm, ramus 10.7–12.1 µm, fulcrum 5.2– 6.1 µm, largest major tooth 10.0–10.6 µm, manubrium 10.7–12.4 µm.

Figures

FIGURE 6. Light microscope photograph of three Testudinella species recorded from Qi’ao Island, China. A. Testudinella pesudobscura sp. nov. ventral view; B. Testudinella zhujiangensis ventral view; C. Testudinella quadrilobata sp. nov. dorsal view; D. Testudinella quadrilobata sp. nov. varying shape of anterior aperture. Scale bar: 50 μm.

FIGURE 12. Testudinella zhujiangensis, scanning electron microscope photographs of trophi. A. Complete set, frontal view. B. Complete set, caudal view. al: alula, as: arched rami scleropili, dc: dorsal chamber, f: fulcrum, m: manubrium, mc: median chamber, r: ramus, ra: ramus apophysis, rf: ramus fenestra, svc: sub-ventral chamber, u: uncus, vc: ventral chamber.

FIGURE 13. Testudinella zhujiangensis, scanning electron microscope photograph of trophi. Detail of major teeth and proximal part of fulcrum, frontal view. al: alula, ba: basal apophysis, fo: fulcrum opening

FIGURE 14. Testudinella zhujiangensis, scanning electron microscope photograph of trophi. A. Detail of ramus, caudal view. B. Detail of rami, frontal view. al: alula, as: arched rami scleropili, fs: frontal rami scleropili, ra: ramus apophysis