Cypricercus centrurus ( Klie, 1940 ), 1994

Almeida, Nadiny Martins De, Ferreira, Vitor Góis, Higuti, Janet & Martens, Koen, 2021, On two new species of Cypricercus Sars, 1895 (Crustacea, Ostracoda) from Brazil with a discussion on the taxonomy of the genus, Zootaxa 4938 (5), pp. 501-536 : 504

Cypricercus centrurus ( Klie, 1940)

( Figs. 1 , 2 )

1940 Strandesia centrura Klie : 201, figs. 1–4.

1994 Cypricercus centrura Martens & Behen : 6, 56.

2005 Strandesia centrura Karanovic : 93.

2009b Cypricercus centrurus Savatenalinton & Martens : table 2.

2019 Cypricercus centrurus Meisch et al. : 46.

Type material. Curated in: Centrum f̹r Naturkunde (CeNaK, Zoologisches Museum, Universität Hamburg, Hamburg, Germany) .

Lectotype (here designated): a female with soft parts dissected in glycerine in a sealed slide (nr 863a—Fig. 2G), and with valves kept in glycerine in a tube together with the in toto paralectotypes (see below). Labels on the slide: “ Strandesia centrura ♀, Brasilien ” and “Glycerinegelatine, Hohwassertümpel, Cachoeira Paulo Affonso, 24.III.36, coll. Schubart ”. (Remark: Hohwassert̹mpel means ‘high water pond’ and this type locality is located in the Brazilian state of Alagoas, waterfall Paulo Affonso, approximate coordinates from Google: 9.3925° S, 38.1970° W).

Paralectotypes (here designated): c. 10 in toto females in glycerine in a tube (nr 863). Label: Strandesia centrura ♀, Brasilien ” and “Glycerinegelatine, Hohwassertümpel, Cachoeira Paulo Affonso, 24.III.36, coll. Schubart ” .

Description of valves (translated and modified from Klie (1940), the latter in German). Greatest height of LV ( Fig. 2A ) only slightly more than 1/3 of the length and situated slightly in front of the middle (at 44/100). Dorsal margin weakly curved, almost straight, sloping towards the posterior side, transition to the narrowly rounded posterior margin with a weak corner; shallow depression present before the transition into the broadly rounded anterior margin. Straight ventral margin with a short, but strong bulge in the mouth area.

RV ( Fig. 2B ) with height/length ratio as in the LV; a spine present in the middle of the posterior margin, length of spine c. 12/100 of the valve length, this spine turned upwards (in lateral view, see Fig. 2B ) and outwardly (in dorsal view, see Fig. 2C ); dorsal margin slightly more arched than in the LV; ventral margin lacking the protrusion in the mouth area, instead with a short and shallow indentation in the middle.

CpD ( Fig. 2C ) with largest width (less than 2/5 th of the length—37/100) in front of the center (at c. 45/100 of the full length, not including the spine); lateral edges weakly curved, anterior margin wedge-shaped, posterior margin sharply rounded. LV in dorsal view rounded at the front and back.

Valves delicate, translucent and without real colouration; inner parts of the animal shimmering yellow-brownish through the valves. External setae on valve surface fine and sparse.

Male unknown.

Measurements: Length: 1.5 mm, Height: 0.66 mm, Width: 0.56 mm. (Remark: these measurements are confirmed by the present authors on the type material).

Remarks. The type material of this species could not be illustrated with Scanning Electron Microscopy (SEM), as Klie generally kept the in toto -specimens of his new taxa in glycerine. This keeps the general shape of the valves and the soft parts intact, but the valves themselves are fully decalcified and cannot be dried for use in SEM.

Figures

FIGURE 1. Map of Brazil, indicating areas where Cypricercus centrurus, Cypricercus alfredo sp. nov. (asexual and sexual populations) and Cypricercus tiao sp. nov. were found.

FIGURE 2. Cypricercus centrurus (synonym Strandesia centrura (Klie, 1940)), A–D: re-drawn after Klie (1940) (not to scale); E–G: original drawings from lectotype. A. LV, external view. B. RV, external view. C. CpD. D. CR. E. CR. F. CR, attachment. G. original photograph of the dissection slide of soft parts of the lectotype. Scale bars: E–F: 200 µm.