Aegla singularis Ringuelet, 1943

Bond-Buckup, Georgina, Jara, Carlos G., Buckup, Ludwig, Bueno, Alessandra A. P., Pérez-Losada, Marcos & Crandall, Keith A., 2010, Description of a new species of Aeglidae, and new records of related species from river basins in Argentina (Crustacea, Anomura), Zootaxa 2343, pp. 18-30 : 27-28

Aegla singularis Ringuelet, 1943

Diagnosis. Lateral margins of anterior branchial area of carapace with scale-shaped tubercles; anterolateral spine of carapace reaching half of cornea; epigastric prominences absent; protogastric lobes raised; rostrum long, styliform, carinate along its entire length; front wide; anterior angle of ventral margin of epimera 2 projecting as a spine; fourth thoracic sternite raised, with scale; proximal outer margin of moveable finger of cheliped with lobe tipped by a robust spine; anterolateral angle of carpus of cheliped acute and projecting in a spine bent toward the carpo-palmar joint; palmar crest rectangular, with lobes and spines; inner margin of ventral face of ischium of cheliped with one distal spine and up to two medial tubercles; dorsal margin of merus of second pereiopod with tubercles and scale-shaped tubercles. (Modified from Bond-Buckup & Buckup 1994.)

Measurements. Males with mean CL of 22.18 mm (n = 7); females with mean CL of 23.73 mm (n = 10 males), showing a mean size much larger than that given by Ringuelet (1948). Species with long rostrum. PCW/FW ratio ranging from 1.61 to 1.87, with a mean of 1.74 in males and 1.67 in females; i.e., front wide. AL/AW ratio from 1.69 to 2.10; mean 1.90 in males and 1.89 in females; areola rectangular.

Former distribution. ARGENTINA: Province of Misiones ( Bond-Buckup & Buckup 1994).

Present distribution. ARGENTINA, BRAZIL, URUGUAY- Basin of Uruguay River.

Remarks. There are no new records for watercourses within Argentina. However, this species was found in southern Brazil and northern Uruguay in tributaries in the Uruguay River drainage basin (Bond-Buckup et al., not published).