Eulimnadia acutirostris Daday de Deés, 1926

Rabet, Nicolas, 2010, Revision of the egg morphology of Eulimnadia (Crustacea, Branchiopoda, Spinicaudata), Zoosystema 32 (3), pp. 373-391 : 376

Eulimnadia acutirostris Daday de Deés, 1926 ( Fig. 1 A-D)

Eulimnadia acutirostris Daday de Deés, 1926: 513 , fig. 126.

Limnadia acutirostris – Brtek 1997: 56.

TYPE LOCALITY. — A temporary pool in Simbidissi and Hogui in the middle part of Niger Basin in French West Africa during the collecting period ( Daday de Deés 1926) and now in Niger or in Mali.

MATERIAL EXAMINED. — Middle part of the Niger Basin, Hogui, temporary pool, 8. VI.1909, D. R. Chudeau, 5 eggs from the bottom of the bottles (MNHN-Bp316, 317).

RANGE. — The present knowledge of egg morphology leads us to considerer this species as known only from type locality.

EGG MORPHOLOGY

Spherical egg covered by spiral ridges. The bottom of the furrows are narrow and the ridges separating them are large and round ( Fig. 1D ). The ridges are complexly fused where they intersect ( Fig. 1A ). Average egg diameter is 139.5 µm (n = 2, SD = 2.12 µm).

REMARKS

The eggs, described from the type specimens only, and coming from the bottle bottom, match the original description, “Ova membrana spiraliter plicata tecta” of Daday de Deés (1926). Long furrows are also present in Imnadia yeyetta oval eggs ( Thiéry & Gasc 1991). However the fusion area of the furrows in Eulimnadia acutirostris is complex because there are several parallel furrows while in Imnadia yeyetta the furrow is unique and forms a spiral with a simple end at the apex. In the studied eggs, the surface is partially covered by micro-organisms and mud.

Figures

FIG. 1. — Eggs morphology:A-D, Eulimnadia acutirostris Daday de Deés,1926,eggs from the type specimen;E-I, Eulimnadia aethiopica Daday de Deés, 1926, eggs from the type specimen. Scale bars: A-C, E-G, 50 μm; D, H, I, 20 μm.