Macrochiridothea michaelseni Ohlin 1901
- Dataset
- A new species of Chaetiliidae (Crustacea: Isopoda: Valvifera) from the Río de la Plata estuary, Argentina-Uruguay, and reconsideration of Macrochiridothea and Chiriscus
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Malacostraca
- order
- Isopoda
- family
- Chaetiliidae
- genus
- Macrochiridothea
- species
- Macrochiridothea michaelseni
diagnosis
Diagnosis. Total body length of male 11.5 mm; female smaller than male. Dorsal surface of head, pereon and pleotelson smooth. Lateral lobes on head rounded. Coxa 6 just overlapping pleonite 2. Antenna 1 peduncle, article 2 with anterodistal prolongation. Antenna 2 peduncle, article 4, 1.3 times as long as greatest width; article 5, 2.5 times as long as greatest width. Pereopods 2 and 3 dactyli subchelate, half as long as propodus. Pereopod 5 ischium without a prominent hook on upper margin. Pleopod 2, appendix masculina strongly curved, laterally with minute setae.
discussion
Remarks. Macrochiridothea michaelseni is the type species and distinguished from others by the combination of lack of sculpture, small posterolateral lobe on the head, short coxa 6 and strong anterodistal process on the second article of antenna 2. Menzies (1962) recorded the species north of Punta Arenas, close to the type locality.
distribution
Distribution. Punta Arenas, Chile (53 ° 09 ' S, 70 ° 55 ' W); 0 – 22 m depth.
materials_examined
Material. Syntypes: Brackish pools of delta of Río de las Minas; and Magellan Strait, 22 m [12 fm], Punta Arenas, 53 ° 09 ' S, 70 ° 55 ' W, Chile, SMNH (15 specimens).