Eulimnadia ovisimilis Martin and Belk, 1989

Marinone, María Cristina, Urcola, Juan Ignacio & Rabet, Nicolas, 2016, Review of the Eulimnadia (Branchiopoda: Spinicaudata: Limnadiidae) from Argentina with the description of a new species, Zootaxa 4158 (3), pp. 419-432 : 426-427

publication ID

publication LSID


persistent identifier

treatment provided by


scientific name

Eulimnadia ovisimilis Martin and Belk, 1989


Eulimnadia ovisimilis Martin and Belk, 1989  

( Figs. 4 View FIGURE 4 G, H)

Material examined. Argentina: Formosa Province: Bermejo Department: Laguna Yema region, temporary pool at 24°15' S, 61°15' W, 160 m asl, collectors: J. Faivovich, J.C. Fernicola and A. López, I-2013, one ovigerous female from the pond and two females (one ovigerous) from the stomach contents of a Lepidobatrachus laevis Budgett, 1899   (Budgetts frog) larva of the same pond, IC-DBBE-UBA GoogleMaps   . Corrientes Province: San Roque Department : San Roque City, roadside pool near National Route 12 at Santa Lucía River, 28°34'28.34" S, 58°43'20.30" W, 55 m asl, collector: M.T. Jordá, 12-III-2000, two hermaphrodites (one ovigerous), IC-DBBE-UBA. GoogleMaps  

Selected characters of the observed specimens. Carapace yellowish, with 6 to 7 growth lines (plus margin). Number of segments: 20–21, number of telsonal spines: 21–25, number of setae of cercopods: 30–32, spine of cercopods small and subapical.

Female rostral variability. The specimens originally described by Martin & Belk (1989) from Paraguay, present bluntly rounded rostrum, whereas all five females from Argentina have pointed rostral tips, resembling the females of E. texana   . However, the head shapes of both species differ in the longer distance from the dorsal organ to the ocular protuberance in E. ovisimilis   . Female rostral variability (from rounded to pointed) has been experimentally induced in E. texana   derived from a single clutch exposed to different predatory pressures ( Rogers et al. 2012), or in E. magdalenensis   by raising specimens at different temperatures ( Roessler 1995).

Eggs. Cylindrical, bearing 12 or 14 longitudinal parallel ridges that separate narrow grooves running from rim to rim ( Figs. 4 View FIGURE 4 G, H), ends flat or slightly concave, with two parallel ridges ( Fig. 4 View FIGURE 4 H) or two crossed-linked ridges ( Fig. 4 View FIGURE 4 I); rims slightly flaring. Egg diameter somewhat wider at the ends (135–174 µm) than at midpoint (135–148 µm); length (120–130 µm); surface textured with minute pores.

Size. Putative hermaphrodite. Carapace length 8.3–10.0 mm, height 6.0– 7.2 mm, height/length 0.70–0.73 (n = 5), width 3.4 mm (n = 1).

Breeding system. Three out of the five females collected in Argentina, were ovigerous. However, since E. ovisimilis   was originally described from a population comprising 12.5% males, we can assume that this species is androdioecious. No spermatophore-like structures were observed.

Ecology. The type locality is a “shallow region with submerged grass about one week after heavy rains that filled a formerly dry pond-marsh” ( Martin & Belk 1989). The new localities for E. ovisimilis   were a temporary pond and a roadside pool. The unexpected finding of two specimens in the stomach contents of a Budgetts frog larva suggests the frog is a passive dispersal agent for this clam shrimp and that this species is relevant in seasonally astatic aquatic habitat food webs in the Chacoan biogeographical province.

Distribution. Paraguay: Chaco Department, National Park Defensores del Chaco (type specimens described by Martin & Belk 1989) and Argentina: Formosa Province (434 km apart from the type locality) and; Corrientes Province (920 km apart from the type locality). All three sites are located within the Chacoan biogeographical province of the Chacoan subregion ( Fig. 6 View FIGURE 6 ).