Acharax aff. bartschii ( Dall, 1908a )
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publication ID |
https://doi.org/ 10.4202/app.00977.2022 |
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persistent identifier |
https://treatment.plazi.org/id/0470A855-EA7B-FF9A-FF93-FE338948F889 |
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treatment provided by |
Felipe |
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scientific name |
Acharax aff. bartschii ( Dall, 1908a ) |
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Acharax aff. bartschii ( Dall, 1908a) View in CoL
Fig. 2A–C View Fig .
Material.— One specimen from block I ( NRM Mo 192667, L = 190.0 mm) , two specimens from the NCC collection (NIGSPAL-003, L = 240.0 mm; NIGSPAL-033, L = 160.0 mm). Upper Miocene of the “shale quarry” within the Northern Cement Corporation quarry in Pangasinan province, Luzon, Philippines .
Remarks.—The extant Acharax bartschii is a large rare species known from central Philippine waters ( Dall 1908a). It agrees well in overall shape with the Miocene specimens reported here, though the radial ribs on the posterior side are directed postero-ventrally in the extant specimens, whereas in the Miocene specimen they are much more ventrally oriented (see Fig. 2A View Fig ). Hence, we assign the Miocene specimens only hesitantly to A. bartschii . The Early to Middle Miocene Acharax yokosukensis Kanie and Kuramochi, 1995 , from central Honshu, Japan, has a more slender shell, and Acharax gigas ( Kanno, 1960) from the Miocene Hiranita and Haratajino formations in central Honshu, Japan, has a much shorter posterior side of shell Kanno 1960; Kanie and Kuramochi 1995, 2002; Amano and Ando 2011: pl. 5: 3).
Fig. 2D View Fig .
Material.— One specimen from block I ( NRM Mo 192660, L = 26.0 mm) , one specimen from block J ( NRM Mo 192534, L = 20.0 mm). Upper Miocene of the “shale quarry” within the Northern Cement Corporation quarry in Pangasinan province, Luzon, Philippines .
Remarks.—The two small available fragments seem to have parallel dorsal and ventral shell margins, unlike A. aff. bartschii , and their radial ribs are broad and flat, unlike the corrugated ribs of A. aff. bartschii .
Family Nuculidae Gray, 1824 View in CoL
Genus Acila Adams and Adams, 1858 View in CoL
Type species: Nucula divaricata Hinds, 1843 , by subsequent designation; Recent , temperate northwestern Pacific Ocean .
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