page_title: Spheniscus muizoni
section_title: Description
hierarchical_section_title: Spheniscus muizoni / Description
caption_attribution_description: English: Fossils of the banded penguin Spheniscus muizoni from the Pisco Formation of Peru
context_page_description: Spheniscus muizoni is an extinct species of banded penguins that lived during the early Late Miocene in what is now Peru, South America. The species, the earliest member of the extant genus, was described in 2007 by Ursula B. Göhlich based on fossils found in the fossiliferous Pisco Formation of the Pisco Basin, southwestern Peru.
context_section_description: The holotype material consists of a partial postcranial skeleton, subcomplete left and right coracoid, subcomplete right scapula, a subcomplete left and right humerus, the left complete ulna, proximal and distal end of the right femur, the complete right and proximal end of the left tibiotarsus, the proximal end of the left fibula, the right complete tarsometatarsus, the cranial portion of the sternum with articular sulcus for coracoid and fragment of the
  craniolateral process, two fragmentary thoracic vertebrae from the caudal region, seven caudal vertebrae and a fragmentary synsacrum.
  Paratype fossils of the species consist of isolated bones; a distal fragmentary half of left coracoid, the right subcomplete coracoid, a left complete ulna, left complete radius, right complete carpometacarpus, the distal end of a right femur, the cranial end of pygostyle and a rib fragment without ends.
  The body mass of the penguin species has been estimated to 3,500 to 3,800 grams (7.7 to 8.4 lb), making it smaller than the Magellanic penguin at 4,500 grams (9.9 lb) and distinctly smaller than the Humboldt penguin, but larger than the Galapagos penguin, which has a body mass of 2,500 grams (5.5 lb).
  Detailed comparisons with extant and fossil species of Spheniscus suggest that the available postcranial bones of S. muizoni morphologically correspond best with those of Spheniscus urbinai from the same formation, aside from that the latter is distinctly larger. Based on the morphological similarity of Spheniscus muizoni S. urbinai and their stratigraphical succession within the Pisco Formation, it can be supposed that the first gave directly rise at least to the latter.S. muizoni is the only known penguin species from the Cerro la Bruja locality and is unknown from any older or younger deposit in or outside the Pisco Formation. Spheniscus muizoni is not only the oldest penguin species in the Pisco Formation, but also representing the stratigraphically oldest record for the extant genus Spheniscus in general.
caption: Fossils of Spheniscus muizoni
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