Cetopirus complanatus Morch 1853

• Main Authors: Collareta, Alberto, Marean, Curtis W., Jerardino, Antonieta, Bosselaers, Mark
• Format: Other/Unknown Material
• Language: unknown
• Published: 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Sessilia; Coronulidae; Cetopirus; Cetopirus complanatus; Arctic; Argentina; Pinnacle; Fossa; The Ribs
• Online Access: https://zenodo.org/record/6020909; https://doi.org/10.5281/zenodo.6020909

Cetopirus complanatus (Mörch, 1853) Fig. 2 Lepas complanata polytalamia Chemnitz, 1785: 325, pl. 99, figs. 845–846 Lepas balaenaris Spengler, 1790: 187 Coronula balaenaris Dufresne, 1802: 473, pl. 30, figs. 2–4 Cetopirus balaenaris Ranzani, 1817: 87 Lepas quinquevalvis Mawe, 1823: 5, pl. 2, fig. 3 Coronula balanarum Blainville, 1824: 380 Polylepas (Cetopirus) vulgaris Gray, 1825: 105 Ceteopirus [sic] complanatus Mörch, 1853: 67 Coronula darwini Stebbing, 1910: 572 Coronula complanata Pilsbry, 1916: 276, pl. 63, figs. 1–3a Coronula complanatus Hiro, 1936: 62 Range and distribution. Middle Pleistocene to Recent. Known as fossil from late Middle Pleistocene deposits of South Africa (this work), Upper Pleistocene deposits of Spain (Álvarez-Fernández et al. 2014), and Holocene deposits of Argentina (Pastorino & Griffin 1996) and The Netherlands (Holthuis et al. 1998). Currently known as an exclusive phoront of Eubalaena Gray, 1864, living in temperate seas between the (sub-)arctic regions and about 25° latitude. Material. A single isolated rostral compartment kept at the Mossel Bay Archaeology Project Cultural Resources Management (MAPCRM) Laboratory of the Bartolomeu Dias Museum (Mossel Bay, South Africa) under accession number MAPCRM 85138. Occurrence. Late Middle Pleistocene (164 ± 12 ka) cemented deposit (LC-MSA Lower horizon of Marean et al. 2007) in cave site PP13B (Pinnacle Point, South Africa). Description and remarks. MAPCRM 85138 (Fig. 2) is an isolated rostral compartment broken transversely to the ribs, a few mm below the basis of the sheath, so that it lacks its lowermost portion. The shape of MAPCRM 85138 suggests a significantly convex, dome-shaped shell. The sheath is smooth, depicting a barrel-shaped body chamber. The basal edge of the sheath does not project freely. Judging from the geometry of the fossa for the accomodation of the ala, the latter should have been thin and square. The compound radius is very thick (i.e., almost as thick as the whole compartment) and, in its median portion, its ...