Streptocephalus zeltneri Daday, 1910

Sainz-Escudero, Lucía, Alonso, Miguel & Sánchez-Vialas, Alberto, 2022, Diversity and distribution of Anostraca in temporary ponds in Western Africa with description of a new species of Streptocephalus Baird, 1852 (Pancrustacea: Branchiopoda: Streptocephalidae), Zootaxa 5213 (4), pp. 388-412 : 404-405

Streptocephalus zeltneri Daday, 1910

Streptocephalus (Streptocephalopsis) zeltneri Daday, 1910a: 396 [Terra typica: Africa centralis, Sudan, Yéliman].

Material examined. Two specimens of Type material (syntypes), one male with broken cercopods and one female, labelled as follows: Yeliman, 1907, F. de Zeltner leg., Muséum National d’Histoire Naturelle, Paris; MNHN-Bp 225 (MNHN-IU-2007-483).

Additional examined specimens. All from Senegal. Two males and 13 females from Kédougou, 2.3 km east of Bandafassi , 141 m, 13 º 46′36.66″N 13 º 44′13.02″W, 07-VIII-2015 ; MNCN 20.04 /20421–20.04/20435. One male and two females also from Kédougou, 2.3 km east of Bandafassi , 161 m, 12 º 32′3.38′′N 12 º 18′32.59′′W, 10-VIII- 2015 ; MNCN 20.04 /20436–20.04/20438. One individual from Kédougou, Bandafassi , 141 m, 12 º 32′21.13″N 12 º 17′20.89″W, 10-VIII-2015 ; MNCN 20.04 /20439 ( Table 2 ) .

Published records. Mali: Goumbou ( Hamer et al. 1994b; Maeda-Martínez et al. 1995b); Yéliman ( Hamer et al. 1994b; Belk & Brtek 1997). Senegal: pool at Ndilla dam, close to Linguère ( Monod 1969; Hamer et al. 1994b); Palagu ( Maeda-Martínez et al. 1995b).

Geographic distribution. This species is only known from Mali and Senegal ( Monod 1969; Hamer et al. 1994b; Maeda-Martínez et al. 1995b; Belk & Brtek 1997). Records from Sudan ( Hamer et al. 1994b; MaedaMartínez et al. 1995b) are currently located in Mali. The previously recorded populations of S. zeltneri in Senegal need revision (see comments on the geographic distribution account of S. wolof ).

Remarks. According to the literature, Streptocephalus zeltneri is morphologically similar to S. trifidus Hartland-Rowe, 1969 and S. bouvieri Daday 1910 ( Daday 1910a; Hartland-Rowe 1969; Hamer et al. 1994b). In their revision, Maeda-Martínez et al. (1995b) included S. zeltneri in a species group formed by S. bouvieri , S. gauthieri , S. rothschildi and S. spinifer . A more detailed study including morphological and molecular characters would be desirable to unveil the evolutionary relationships among the species of the bouvieri species group sensu Maeda-Martínez et al. (1995b).

Brendonck & Coomans (1994) provided a description and a picture of the eggs of the holotype of S. zeltneri , stating that the eggs have simple and more or less regular polygons, and that their ribs are unkeeled. Similarly, the eggs from our samples of S. zeltneri of southeastern Senegal, have unkeeled ribs ( Fig. 3B ). This trait was consistent in the revised populations of S. zeltneri with mature females (two out of the three populations).

Specimens were found in small and transparent pools with clam shrimps. Live specimens present the cercopods and the brood pouch with a strong red coloration.

Figures

FIGURE 3. Electronic scanning microscope images of the eggs of: A, Streptocephalus wolof sp. nov., 2 km north of Podor; B, Streptocephalus zeltneri, Bandafassi; C, Streptocephalus sudanicus, Gourel Yoba; D, Branchinella (B.) chudeaui, Tilagne Tokossel. Scale bar indicates 100 µm for each egg sample.