Placunopsis gingensis, left valve, from Todd & Palmer (2002).

Belongs within: Pteriomorphia.
Contains: Buchiacea, Deltopecten, Aviculopectinoidea, Plicatuloidea, Limidae, Anomia.

The Pectinida are a clade of bivalves supported by molecular data, combining the living taxa Pectinoidea, Limoidea and Anomiidae. The Anomiidae, golden oysters, are a family of generally sessile bivalves that are first definitely known from the Jurassic (Todd & Palmer 2002). Anomiids usually have thin, translucent shells, and are attached to the substrate when mature by a byssal plug passing through a large foramen in the right valve. The dorsoventrally striated byssal plug is calcified by a mixture of calcite and aragonite.

<==Pectinida [Pectinina, Pectinoida] PC11
    |--+--+--Aviculopectinoidea W06
    |  |  `--Plicatuloidea M96
    |  `--Limoidea [Limoida] C96
    |       |  i. s.: Regalilima JB12
    |       |         Prolobella Ulrich 1894 C04
    |       |--Limidae PC11
    |       `--Myodakryotus Tunnicliff 1987 [Myodakryotidae] C96
    |            `--M. deigryn Tunnicliff 1987 SB93
    `--Anomiidae [Anomioidea] PC11
         |--Patro elyros (Gray 1849) TP02, H09 [=Anomia elyros H09]
         |--Eonomia timida Fürsich & Palmer 1982 SB93
         |--Enigmonia M96
         |--Anomia P61
         |--Juranomia Fürsich & Werner 1989 TP02
         |    `--*J. calcibyssata Fürsich & Werner 1989 TP02
         |--Osteodesma C64
         |    |--O. aeruginosa Mighels 1844 J49
         |    `--O. kutorgana G31
         |--Monia Gray 1849 P61
         |    |--*M. zelandica (Gray 1843) [=Anomia zelandica] P61
         |    |--M. furcata (Suter 1907) P61 [=Anomia furcata F27]
         |    `--M. incisura A27
         |--Pododesmus TP02
         |    |--P. macrochizma KBC03
         |    |--P. patelliformis [=Monia patelliformis] TP02
         |    |--P. rudis M63
         |    |--P. squama [=Monia squama] TP02
         |    |--P. squamula [=Heteranomia squamula] K92
         |    `--P. zelandicus PG98
         |--Placunanomia H09
         |    |--P. cumingii C64
         |    |--P. foliata C64
         |    |--P. incisura H86
         |    |--P. ione Gray 1850 H09
         |    |--P. macroschisma [incl. P. alope, P. cepio, Anomia subcostata Conrad 1855] C64
         |    `--P. neozelanica H86
         `--Placunopsis Morris & Lycett 1853 [Placunopsidae] TP02
              |--P. inaequalis (Phillips 1829) (see below for synonymy) TP02
              |--P. arcensis Freneix 1986 [=P. radiata arcensis] TP02
              |--P. distracta (Eichwald 1865) TP02
              |--P. fuersichi Todd & Palmer 2002 TP02
              |--P. gingensis (Quenstedt 1856) TP02
              |--P. matercula TP02
              |--P. radians Morris & Lycett 1853 TP02
              |--P. semistriata (Bean 1839) [=Anomia semistriata] TP02
              |--P. socialis Morris & Lycett 1853 TP02
              `--P. suprajurensis TP02

Pectinida incertae sedis:
  Buchiacea JB12
  Deltopectinidae JB12
    |--Deltopecten JB12
    |--Orbiculopecten parma Gonzalez 1978 SB93
    |--Corrugopecten altoprimus Waterhouse 1982 SB93
    `--Streblopteria JB12
         |--S. deprati G31
         |--S. granosostriata G31
         |--S. magnini G31
         |--S. plana G31
         `--S. sericea G31
  Pseudomonotidae JB12
    |--Eumicrotis JB12
    |--Lyriopecten gracilis Dun 1898 JB12, F71
    |--Pachypteria nobilissima de Koninck 1851 SB93
    `--Pseudomonotis SB93
         |  i. s.: P. bjona G31
         |         P. daonelliformis G31
         |         P. furcoplicatus Grabau 1931 G31
         |         P. garforthensis G31
         |         P. mathieui G31
         |         P. radialis G31
         |         P. shansiensis G31
         |--P. (Pseudomonotis) speluncaria (von Schlotheim 1816) SB93
         `--P. (Aviculomonotis Grabau 1931) G31
              |--P. (*A.) mongoliensis Grabau 1931 G31
              |--P. (A.) kazanensis G31
              `--P. (A.) matthewi Grabau 1931 G31
  Lentipecten hochstetteri JB12, M49

Placunopsis inaequalis (Phillips 1829) [=Ostrea inaequalis, Anomia inaequalis; incl. Placunopsis fibrosa Laube 1867, Placuna jurensis Roemer 1836, *Placunopsis jurensis, Placunopsis oblonga Laube 1867, Orbicula radiata Phillips 1829, Placunopsis radiata] TP02

*Type species of generic name indicated


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[PC11] Plazzi, F., A. Ceregato, M. Taviani & M. Passamonti. 2011. A molecular phylogeny of bivalve mollusks: ancient radiations and divergences as revealed by mitochondrial genes. PLoS One 6 (11): e27147.

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[TP02] Todd, J. A., & T. J. Palmer. 2002. The Jurassic bivalve genus Placunopsis: new evidence on anatomy and affinities. Palaeontology 45 (3): 487–510.

[W06] Waller, T. R. 2006. Phylogeny of families in the Pectinoidea (Mollusca: Bivalvia): importance of the fossil record. Zoological Journal of the Linnean Society 148 (3): 313–342.

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