Macrochiridothea robusta Bastida & Torti, 1969

Poore, Gary C. B., 2009, A new species of Chaetiliidae (Crustacea: Isopoda: Valvifera) from the Río de la Plata estuary, Argentina-Uruguay, and reconsideration of Macrochiridothea and Chiriscus, Zootaxa 2119, pp. 51-65 : 62

Macrochiridothea robusta Bastida & Torti, 1969

Macrochiridothea robusta Bastida & Torti, 1969: 65 –72, figs 1, 2. — Moreira, 1973: fig. 15. — Carvacho, 1997: 51 (list).

Material. Holotype: Buenos Aires Province, Argentina (37°57'S, 57°28'W), 16 m, MACN 27.327 (ovigerous female, 8.9 mm, examined by AS).

Paratypes: MNHN Is.3848 (female, examined by GCBP); "colección particular" (adult male).

Diagnosis. Total body length of female 9 mm. Dorsal surface smooth except for posterolateral spines on pereonite 1 and small middorsal tubercles on pereonites 6 and 7; pleotelson with obsolete median carina on pleonite 4. Lateral lobes on head acute. Coxa 6 reaching posteriorly to pleonite 3. Antenna 1 peduncle, article 2 with anterodistal prolongation. Antenna 2 peduncle, article 4, as long as greatest width; article 5, 3 times as long as greatest width. Pereopods 2 and 3 dactyli minute, hook-like. Pereopod 5 ischium without a prominent hook on upper margin.

Distribution. Buenos Aires Province, Argentina (38°S); 16–22 m depth.

Remarks. In Bastida & Torti’s (1969) figure of the holotype, pereonite 6 is longer than in other species, an observation confirmed by examination of the holotype in MACN and of the paratype in MNHN. The carina on pleonite 4, referred to as “espina mediana anterior” by Bastida & Torti (1969) is not evident in the somewhat distorted paratype.