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Plocezyga
Taxonomy
Hemizyga (Plocezyga) was named by Knight (1930).
It was Gamizyga (Plocezyga) by Hoare and Sturgeon (1980); it was reranked as Ploceozyga by Pan and Erwin (2002); it was reranked as Plocezyga by Knight et al. (1960), Hoare and Sturgeon (1980), Sepkoski (2002) and Wagner (2023).
It was assigned to Hemizyga by Knight (1930); to Pseudozygopleuridae by Hoare and Sturgeon (1980); to Gamizyga by Hoare and Sturgeon (1980); to Neotaenioglossa by Sepkoski (2002); and to Pseudozygopleurinae by Knight et al. (1960), Pan and Erwin (2002) and Wagner (2023).
It was Gamizyga (Plocezyga) by Hoare and Sturgeon (1980); it was reranked as Ploceozyga by Pan and Erwin (2002); it was reranked as Plocezyga by Knight et al. (1960), Hoare and Sturgeon (1980), Sepkoski (2002) and Wagner (2023).
It was assigned to Hemizyga by Knight (1930); to Pseudozygopleuridae by Hoare and Sturgeon (1980); to Gamizyga by Hoare and Sturgeon (1980); to Neotaenioglossa by Sepkoski (2002); and to Pseudozygopleurinae by Knight et al. (1960), Pan and Erwin (2002) and Wagner (2023).
Subtaxa
Hemizyga (Plocezyga) abolescens, Hemizyga (Plocezyga) angularis, Hemizyga (Plocezyga) convertacostata, Hemizyga (Plocezyga) serocorona, Hemizyga (Plocezyga) tenuis, P. (Plocezyga), P. acuminata, P. boikoi, P. conica, P. convexa, P. cordiformis, P. corona, P. costata, P. delicata, P. excellens, P. gruendeli, P. indica, P. intermedia, P. lineata, P. lirata, P. markae, P. minuta, P. obscura, P. ornata, P. ornatissima, P. percostata, P. perminuta, P. regularia, P. salomonense, P. subnodosa, P. subquadrata, P. tenuilirata, P. turbinata, P. venusta
Synonymy list
| Year | Name and author |
|---|---|
| 1930 | Hemizyga (Plocezyga) Knight pp. 17 – 18 |
| 1960 | Plocezyga Knight et al. p. 315 |
| 1980 | Gamizyga (Plocezyga) Hoare and Sturgeon p. 160 |
| 1980 | Plocezyga Hoare and Sturgeon p. 1101 |
| 2002 | Ploceozyga Pan and Erwin p. 25 |
| 2002 | Plocezyga Sepkoski |
| 2023 | Plocezyga Wagner p. G1200 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Plocezyga Knight 1930
show all | hide all
†Gamizyga (Plocezyga) percostata subrotunda Hoare and Sturgeon 1980
†Hemizyga (Plocezyga) abolescens Knight 1930
†Hemizyga (Plocezyga) angularis Knight 1930
†Hemizyga (Plocezyga) convertacostata Hoare 1961
†Hemizyga (Plocezyga) serocorona Batten 1985
†Hemizyga (Plocezyga) tenuis Knight 1930
Subg. †Plocezyga (Plocezyga) Knight 1930
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†Plocezyga (Plocezyga) varica Pan and Erwin 2002
†Plocezyga (Plocezyga) yunnanensis Pan and Erwin 2002
†Plocezyga acuminata Hoare and Sturgeon 1980
†Plocezyga boikoi Mazaev 2019
†Plocezyga conica Hoare and Sturgeon 1980
†Plocezyga convexa Mazaev 2019
†Plocezyga cordiformis Hoare and Sturgeon 1980
†Plocezyga corona Knight 1930
†Plocezyga costata Mark 1912
†Plocezyga delicata Hoare and Sturgeon 1980
†Plocezyga excellens Hoare and Sturgeon 1980
†Plocezyga gruendeli Kaim 2004
†Plocezyga indica Reed 1944
†Plocezyga intermedia Hoare and Sturgeon 1980
†Plocezyga lineata Hoare and Sturgeon 1980
†Plocezyga lirata Hoare and Sturgeon 1980
†Plocezyga markae Hoare and Sturgeon 1980
†Plocezyga minuta Mazaev 2019
†Plocezyga obscura Hoare and Sturgeon 1980
†Plocezyga ornata Mark 1912
†Plocezyga ornatissima Hoare and Sturgeon 1980
†Plocezyga percostata Knight 1930
†Plocezyga perminuta Hoare and Sturgeon 1980
†Plocezyga regularia Hoare and Sturgeon 1980
†Plocezyga salomonense Gemmellaro 1889
†Plocezyga subnodosa Hoare and Sturgeon 1980
†Plocezyga subquadrata Hoare and Sturgeon 1980
†Plocezyga tenuilirata Knight 1930
†Plocezyga turbinata Hoare and Sturgeon 1980
†Plocezyga venusta Mazaev 2019
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1930 | Hemizygae with strong transverse costae that are confined to the
sides of the volution, and with fine revolving lirae on the sides and base. The columellar section shows a slightly arcuate columella, a sub-circular opening and a relatively thin outer wall with no localized thickening (Fig. 3, F). The pseudozygopleuroid nucleus has been observed in numerous specimens. |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 7 | 2.84 | 0.630 | 30.0 | 1.40 | 10.8 | |
| shell diameter | 7 | 7.65 | 2.60 | 22.5 | 12.6 | 14.1 |
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| Source: c = class | |||||
| Reference: Kiessling 2004 | |||||
Age range: base of the Kashirian to the top of the Middle Bathonian or 313.80000 to 164.70000 Ma
Collections (42 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Atokan | USA (Ohio) | Gamizyga conica, Gamizyga lirata, Gamizyga subnodosa (79351) Gamizyga delicata, Gamizyga lirata (183261) | |
| Moscovian | USA (Missouri) | Hemizyga percostata, Hemizyga tenuilirata, Hemizyga corona, Hemizyga angularis, Hemizyga tenuis, Hemizyga abolescens (69773) | |
| Kashirian - Myachkovian | USA (New Mexico) | P. tenuilirata, P. spp., P. corona (46548) | |
| Desmoinesian | USA (Missouri) | Hemizgya percostata (70296) Hemizgya tenuilirata, Hemizgya convertacostata, Hemizgya percostata (70482) | |
| Desmoinesian | USA (Ohio) | Gamizyga conica (71963 79389) Gamizyga conica, Gamizyga delicata, Gamizyga excellens, Gamizyga intermedia, Gamizyga lineata (72004) Gamizyga conica, Gamizyga delicata, Gamizyga intermedia, Gamizyga perminuta, Gamizyga subnodosa (93081) Gamizyga intermedia (64945 79325 183258) Gamizyga subnodosa (64906 183203 183207 183208) | |
| Desmoinesian | USA (New Mexico) | Hemizyga percostata, Hemizyga tenuilirata, Hemizyga corona, Hemizyga sp. 1, Hemizyga delicata (46536) | |
| Missourian | USA (Ohio) | Aclisina costata, Aclisina ornata (69721) Gamizyga acuminata, Gamizyga cordiformis, Gamizyga intermedia, Gamizyga markae, Gamizyga ornatissima, Gamizyga regularia, Gamizyga turbinata, Hemizyga sp., Gamizyga ornata, Gamizyga costata (93082) Gamizyga conica, Gamizyga delicata, Gamizyga subnodosa (79350) Gamizyga intermedia, Gamizyga costata (71968) Gamizyga ornata (183165) Gamizyga ornata, Gamizyga costata (183202 183205) Gamizyga ornata, Gamizyga costata, Gamizyga percostata (79349) Gamizyga ornatissima, Gamizyga costata (183204) Gamizyga turbinata, Gamizyga ornata, Gamizyga percostata (183167) | |
| Virgilian | USA (West Virginia) | Gamizyga acuminata, Gamizyga obscura, Gamizyga subquadrata, Gamizyga turbinata (79391) | |
| Virgilian | USA (New Mexico) | Hemizyga sp. (156695) P. conica, P. turbinata (146828) | |
| Asselian | Russian Federation (Bashkortostan) | P. minuta (202159) P. sp. (220885) P. venusta (202158) | |
| Sakmarian | Russian Federation (Bashkortostan) | P. convexa (220898) | |
| Kungurian | Malaysia (Perak) | Hemizyga serocorona (62131) | |
| Wordian | Italy | Loxonema salomonense (108672) | |
| Wuchiapingian | Greece | P. sp. (64172 64173) | |
| Wuchiapingian | Pakistan | Hemizyga indica (126895) | |
| Changhsingian | China (Yunnan) | Ploceozyga varica, P. yunnanensis (56943) | |
| Middle Bathonian | Poland | P. gruendeli (63078) |