Eulimnadia magdalenensis Roessler 1990

Padhye, Sameer M. & Rabet, Nicolas, 2017, Re-description of two spiny clam shrimps (Crustacea: Branchiopoda: Spinicaudata) of the Indian subcontinent from Daday de Dees's collection at MNHN with new insights on the validity of Eulimnadia compressa (Baird, 1860) and Eulimnadia chaperi (Simon, 1886), Zootaxa 4294 (3), pp. 349-360 : 357-358

Eulimnadia magdalenensis Roessler 1990

Fig.6 (C, F, I)

Material examined. Eggs and two hermaphrodites from MNHN-IU-2007-597 (= MNHN-Bp328) and eggs from MNHN-IU-2007-594 (= MNHN-Bp325); collector: H. Harmand (Date: 17/05/1905). Comparative material: Eggs from MNRJ 3003; collector: N. Rabet (Date: 18/07/1993) and specimens obtained by sediment re-hydration from Barrol?ndia (see Rabet et al. 2012).

Localities. "marais d'Angkor", Cambodia (Cochinchina during the sampling time). Comparative material: Cabo Branco (PB, Brazil), Barrolândia (BA, Brazil) from the Atlantic forests of Brazil.

The specimens were in a pretty bad shape and many morphological characters were undeterminable.

Eggs. In all the three populations studied, the eggs are spherical and ornamented by large pentagonal or hexagonal depressions with a flat bottom and narrow high ridges. Ridge intersections bear a well-developed spiniform projection ( Fig.6 B & 6C). Internal structure of egg shell consists in an alveolar layer relatively homogeneous with largest vesicles more abundant in cortical crests ( Fig.6 E, 6F, 6H & 6I). Details for each population are given in table 1.

Remarks. Given the striking similarity in the egg external ornamentation as well its internal morphology of the egg shell layer, we suggest that the Eulimnadia population from Angkor, Cambodia could be E. magdalenensis . Due to the geographical distance between South America and Cambodia we must consider this taxonomic position as provisional until a detailed morphological comparison of adults and a detailed analysis using molecular data can be performed.

Species E. chaperi E. magdalenensis

Locality Vajrakarur (Andhra Pradesh, Angkor Barrolândia Cabo Branco India) ( Cambodia) (Bahia, Brazil) (Paraiba, Brazil)

Number of polygons N 9 6 10 8 Range 16–22 23–28 19–26 19–25

Diameter of eggs N 9 6 4* 8

Range 207–243 µm 184–194 µm 180–216 µm 174–203 µm

Figures

FIGURE 6. Comparison of Egg of Eulimnadia chaperi (Simon, 1886) and Eulimnadia magdalenensis Roessler, 1990. A, D & G, egg morphology and internal egg morphology of E. chaperi. B, E & H, E. magdalenensis from Angkor, Cambodia. C, F & I, E. magdalenensis from Cabo Branco, Brazil. Scale bars: A, B, C: 100 µm; D, E, F: 10 µm; G, H, I: 5 µm.