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Anoptambonites
Taxonomy
Anoptambonites was named by Williams (1962) [Sepkoski's age data: O (Llde) O (Ashg-m)].
It was assigned to Leptelloidinae by Williams (1962); to Leptellininae by Mitchell (1977); to Strophomenida by Sepkoski (2002); and to Hesperomenidae by Williams et al. (2000), Popov et al. (2000), Cocks (2005) and Benedetto (2012).
It was assigned to Leptelloidinae by Williams (1962); to Leptellininae by Mitchell (1977); to Strophomenida by Sepkoski (2002); and to Hesperomenidae by Williams et al. (2000), Popov et al. (2000), Cocks (2005) and Benedetto (2012).
Synonymy list
| Year | Name and author |
|---|---|
| 1962 | Anoptambonites Williams pp. 170 - 171 |
| 1977 | Anoptambonites Mitchell |
| 2000 | Anoptambonites Popov et al. |
| 2000 | Anoptambonites Williams et al. p. 339 |
| 2002 | Anoptambonites Sepkoski |
| 2005 | Anoptambonites Cocks p. 273 |
| 2012 | Anoptambonites Benedetto p. 439 |
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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. †Anoptambonites Williams 1962
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†Anoptambonites convexus Popov et al. 2002
†Anoptambonites exedra Percival 1991
†Anoptambonites grayae Davidson 1883
†Anoptambonites kovalevskii Popov et al. 2000
†Anoptambonites monetus Barrande 1879
†Anoptambonites myiomorpheus Potter 1990
†Anoptambonites myriomorpheus Potter 1990
†Anoptambonites pulchra Cooper 1956
†Anoptambonites subcarinata Nikitin and Popov 1996
†Anoptambonites williamsi Cocks 2005
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams 1962 | Concavo-convex, elongately semi-oval to semicircular shells with a subdued carina in the pedicle valve and a complementary sharp postero-median indentation in the brachial valve; ornamentation finely multicostellate but with accentuated primary costae; ventral interarea long, apsaeline, delthyrium acutely triangular, pseudodeltidium possibly apical but mostly unknown and pedicle presumed functional, dorsal interarea shorter, anacline, chilidial arch complete and strong; shell substance pseudopunctate.
Teeth strong, disposed slightly lateral of the delthyrial edges and flanked ventro-medianly by a pair of medianly sloping ridges that are continuous along their ventral surfaces with the muscle-scar boundary and are the equivalent of the accessory teeth in other allied genera; muscle-field small, cordate and raised, with a low median ridge surmounted posteriorly by an elevated and elongately oval callosity that is also ankylosed to the delthyrial walls by a pair of acutely triangular sheets of secondary shell substance covering the postero-ventral portions of the accessory teeth; the resultant structure simulates a "pedicle chamber" and possibly acted in that capacity. Muscle-scar poorly differentiated, but the adductor bases were probably located postero-medianly on either side of the median ridge and under the free anterior margins of the pedicle chamber. Pallial sinus pattern obscure, except for slightly divergent impressions of the vascula media emanating from the antero-lateral edges of the muscle-field and the suggestion of saccate vascula genitalia. Cardinal process complex, consisting of a massive boss, covered dorsally by the chilidium, undercut anteriorly and composed of a median ridge of fibrous calcite, flanked on either side by as many as 6 lateral ridges of cryptocrystalline calcite all embedded in secondary shell substance and forming a corrugated base for diductor attachment. The boss is contiguous laterally with a pair of curved plates to form a semicircular structure, convex posteriorly, which is homologous with the notothyrial platform and cardinal process of allied plectambonitaceids and is barely supported by a low, subdued, median ridge which passes anteriorly into the median septum of the lophophore platform. A pair of plate-like and divergent brachiophore bases occur laterally of the platform and are separated from it by deep excavations; the posterolateral faces of the bases define transversely oval sockets; the brachiophores are seen in serial sections to continue anteriorly in the line of their bases as a pair of curved plates. The lophophore platform is subquadrate in outline, strongly elevated, and slightly cleft antero-medianly where it joins a high, blade-like, median septum. The adductor scar is large and subflabellate; the pallial sinus pattern is probably lemniscate, comprising the vascula genitalia impressed laterally to the sockets, a very strong pair of divergent vascula myaria dividing the adductor scar, and a smaller pair of vascula media adjacent to the median septum. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Hendy 2009, Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Age range: base of the Middle Llandeilo to the top of the Rawtheyan or 461.10000 to 445.20000 Ma
Collections (90 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Chazyan | USA (Alabama) | Leptellina pulchra (162364) | |
| Middle Ordovician - Late/Upper Ordovician | USA (California) | A. myriomorpheus (100612 100865 100867) | |
| Early/Lower Llandeilo | China (Hubei) | A. sp. (4711) | |
| Middle Llandeilo - Late/Upper Llandeilo | China (Hubei) | A. sp. (4710) | |
| Gisbornian - Darriwilian | Australia (New South Wales) | A. sp. (119705) | |
| Costonian - Harnagian | China (Hubei) | A. sp. (4708) | |
| Gisbornian - Harnagian | Australia (New South Wales) | A. sp. (2708) | |
| Sandbian | USA (Alaska) | A. grayae (164856) | |
| Caradoc | Kazakhstan | A. convexus (80206 80210 80212 80215 80217 80218 80221) A. kovalevskii (116304 116305 116306 116307 116308) A. orientalis (80261 80263 80265 80276) | |
| Caradoc | China (Guizhou) | A. sp. (186302) | |
| Caradoc - Ashgill | Russian Federation (Taimyr) | A. sp. (37637) | |
| Ashbyan | USA (Alaska) | A. grayae, A. pulchra (164853) | |
| Burrellian | United Kingdom (Scotland) | A. sp. (165047 192745) | |
| Actonian - Onnian | China (Sichuan) | A. sp. (7667) | |
| Katian | Russian Federation (Siberia) | A. grayae (205560) | |
| Katian | Kazakhstan | A. kovalevskii (161919 204072 204076) A. sp. (161990) A. subcarinatus (80173) | |
| Katian - Hirnantian | Sweden (Dalarne) | A. williamsi (73413) | |
| Eastonian | Australia (New South Wales) | A. exedra (2702 2725 2731 2745 166833 166835 166837) A. sp. (2648 2700 2701) | |
| Cheneyan | United Kingdom (Scotland) | A. grayae (164412 164950 164953) | |
| Harju | Sweden | A. sp. (379) | |
| Kralodvorian | Czech Republic (Prague) | A. moneta (76479) | |
| Kralodvorian | Czech Republic (Praha) | A. monetus (151985) A. sp. (151986 151988) | |
| Kralodvorian - Rawtheyan | Czech Republic | A. sp. (3879) | |
| Pusgillian | Sweden | A. sp. (2773) | |
| Ashgill | USA (Maine) | A. sp. indet. (185954) | |
| Ashgill | USA (California) | A. myriomorpheus (99692 99694 99695 99805 100543 100544 100546 100547 100548 100549 100550 100551 100552 100553 100611 100635 100636 100637 100638 100639 100640 100644) A. sp. 1 (99696 99697 99698) | |
| Pirgu - Porkuni | Sweden (Dalarne) | A. williamsi (73407) | |
| Pirgu - Hirnantian | Sweden (Dalarne) | A. williamsi (73466) | |
| Cautleyan | United Kingdom | A. sp. (163264) | |
| Cautleyan | Kazakhstan (Central) | A. subcarinata (52737) | |
| Rawtheyan | United Kingdom (England) | A. sp. (3666) |