Testudinella clypeata (Müller, 1786), Muller, 1786

De, Willem H., 2009, A review of the marine and brackish-water species of Testudinella (Rotifera: Monogononta, Testudinellidae), with the description of two new species, Zootaxa 2092, pp. 1-20 : 11-13

publication ID

https://doi.org/ 10.5281/zenodo.187516

DOI

https://doi.org/10.5281/zenodo.6215591

persistent identifier

https://treatment.plazi.org/id/953D87D5-FFC0-FF90-FF3B-E8E4ACB6FDF2

treatment provided by

Plazi

scientific name

Testudinella clypeata (Müller, 1786)
status

 

Testudinella clypeata (Müller, 1786) View in CoL

( Figs 8–10 View FIGURE 8 View FIGURE 9 View FIGURE 10 )

T. clypeata typica after Voigt (1957), T. elliptica View in CoL after Jersabek et al. (2003, ANSP Catalog Number 1828)? non T. clypeata View in CoL after Rousselet (1898), Dieffenbach & Sachse (1912) and Bartoš (1951, Figs 7 View FIGURE 7 , 8 View FIGURE 8 ), T. crassa View in CoL after Harring (1913), T. clypeata View in CoL var. crassa after Remane (1929) and Voigt (1957), T. clypeata crassa after Wiszniewski (1954) and Bērziņš (1960)

non T. clypeata View in CoL after Bartoš (1951, Figs 3 View FIGURE 3 , 4 View FIGURE 4 ), T. clypeata dentata View in CoL after Wiszniewski (1954), T. clypeata View in CoL f. pseudoclypeata Koste (1978) View in CoL

This species is easily recognized by the elliptical lorica (length/width ratio 1.30–1.55, average 1.45), which is often slightly angular postero-laterally ( Figs 8 View FIGURE 8 A, 9C) apparently depending on the state of contraction or fixation ( Fig. 9 View FIGURE 9 ). The dorsal anterior margin is convex, and the ventral anterior margin shows a broad Vshaped sinus; a dorsal transversal fold is often present at the end of the lorica. In cross-sectional view ( Fig. 8 View FIGURE 8 D–F) the dorsal margin appears convex, the lateral edges are broadly rounded and separated by a shallow sulcus from a convex median part ventrally. The characteristic foot-opening is a wide inverted U-shaped slit, situated ventral and sub-terminal. The foot ( Fig. 8 View FIGURE 8 G) is composed of a long and wrinkled proximal part, a clearly offset slender distal pseudosegment and a less defined short penultimate pseudosegment. The dorsal and lateral antennae are situated somewhat posterior to the anterior third of the lorica: ratio lorica length/ position of antenna(e) relative to antero-dorsal margin varying from 2.70–2.85 (average 2.75) and 2.35–2.75 (average 2.58) respectively. Two red eyespots.

The trophi ( Fig. 10 View FIGURE 10 and De Smet (2005)) are characterized by 14–16/14–16 (left/right) unci teeth. The three major teeth show a slender and distinctly offset head. The manubria are composed of three large superimposed chambers, the dorsal, median and ventral, and a strongly reduced sub-ventral chamber ( Fig. 10 View FIGURE 10 B: sc). About 28–30/25–26 arched rami scleropili are apparent in caudal view. The fulcrum shows a distinct proximal opening frontally ( Fig. 10 View FIGURE 10 : fo).

Measurements. Lorica length 150–170 µm, lorica width 100–130 µm, distal foot pseudosegment 18–22 µm.

According to De Ridder & Segers (1997), T. clypeata is a widespread species occurring in the marine littoral and brackish waters all over the Palaearctic region. The species has apparently often been confused with T. elliptica , however, the reliable illustrated records by De Manuel et al. (1992), De Maeseneer (1980), De Ridder (1957a, b, 1967, 1972), Gillard (1947), Hudson & Gosse (1886), Seehaus (1930), von Hofsten (1911), Wulfert (1942) and personal observations confirm this general distribution. The reports from freshwater habitats are probably misidentifications concerning T. elliptica . De Ridder & Segers (1997) also report the species from the Nearctic region (Cap Breton Island, Nova Scotia, Canada), incorrectly referring to Chengalath & Koste (1988). However, the specimens mentioned sub T. elliptica by Jersabek et al. (2003; ANSP Catalog Number 1828) and originating from a brackish pool near Atlantic City, New Jersey, USA are distinctly T. clypeata , illustrating the species’ presence in the Nearctic.

Kingdom

Animalia

Phylum

Rotifera

Class

Eurotatoria

Order

Flosculariaceae

Family

Testudinellidae

Genus

Testudinella

Loc

Testudinella clypeata (Müller, 1786)

De, Willem H. 2009
2009
Loc

pseudoclypeata

Koste 1978
1978
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