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Pentamerus oblongus
Taxonomy
Pentamerus oblongus was named by de Sowerby (1839).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1839 | Pentamerus oblongus de Sowerby p. 641 figs. pl. 19, fig. 10 |
| 1839 | Pentamerus oblongus de Sowerby and Murchison p. 641 figs. pl. 19, fig. 10 |
| 1987 | Pentamerus oblongus Temple p. 101 |
| 2000 | Pentamerus oblongus Jin and Copper p. 46 figs. Pl. 8, figs. 1-13; Pl. 9, figs. 1-5; Pl. II, fig. 6; Text-figs. 18, 19 |
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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.
†Pentamerus oblongus de Sowerby 1839
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Jin and P. Copper 2000 | Shell medium to very large in size, with average length of 48 mm, width 45 mm, and thickness 25 mm (Text-fig. 18), and largest specimen attaining length of 98 mm, width 61 mm, and thickness 48 mm (Pl. 8, figs. 1-5); commonly smooth, or faintly plicate in small number of specimens, elongate, strongly and almost equally biconvex, prominently trilobate with median lobe strongly protruding at the anterior margin; maximum convexity reached at about mid-length of shell. Hingeline slightly curved, attaining about 2/3 of shell width. Anterior commissure approximately recti marginate or broadly wavy due to trilobation.
Ventral umbo high, strongly convex, relatively narrow, extending 4-6 mm above hingeline in specimens of average size, forrning apical angles of 70-85°; beak strongly arched and appressed onto dorsal umbo; palintrope smoothly curved; delthyrium covered apically by thin, concave pseudodeltidium; ventral fold or sulcus absent, but median lobe becoming strongly elevated, bordered by pair of grooves, to resemble fold in some large shells. Dorsal umbo moderately convex, with small beak buried in delthyrial cavity; dorsal fold or sulcus absent, but also bearing prominently elevated median lobe in some specimens. Spondylium long, extremely narrow and deep (Text-fig. 19), extending for 1/2-2/3 of shell length; floor of spondylium weakly striated anteriorly, shown as saw structures in cross-sections (Pl. 11, fig. 6). Median septum about as long as spondylium, fonned by thin median lamellar layer reinforced on both sides by thick prismatic layers; microstructures of median septum discontinuous from, and wedging into, those of valve floor. Outer and inner plates thin, long, subparallel to median plane, extending for 1/2-2/3 of shell length. Brachial processes ribbon-like, as long as or slightly longer than spondy1ium. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004, Hendy 2009 | |||||
Collections (78 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Juuru | Estonia (Järva) | Pentamerus oblongus (193099) | |
| Juuru - Raikkula | Estonia (Pärnu) | Pentamerus oblongus (193101) | |
| Rhuddanian - Aeronian | Russian Federation (Siberia) | Pentamerus oblongus (206542) | |
| Llandovery | USA (Iowa) | Pentamerus oblongus (26713) | |
| Llandovery | Estonia (Rapla) | Pentamerus oblongus (195609) | |
| Llandovery | Russian Federation (Siberia) | Pentamerus oblongus (206306 206317) | |
| Llandovery | Canada (Québec) | Pentamerus oblongus (24540) | |
| Llandovery | Russian Federation (Tyva) | Pentamerus oblongus (78709) | |
| Llandovery | USA (New York) | Pentamerus oblongus (26773) | |
| Llandovery | Russian Federation | Pentamerus oblongus (24773) | |
| Llandovery | Russian Federation (Khakasiya) | Pentamerus oblongus (78710) | |
| Llandovery | USA (Wisconsin) | Pentamerus oblongus (12996 12997 12998 12999) | |
| Alexandrian - Niagaran | Canada (Québec) | Pentamerus oblongus (25155) | |
| Llandovery - Ludlow | China (Xinjiang) | Pentamerus oblongus (27764) | |
| Raikkula | Estonia (Pärnu) | Pentamerus oblongus (193104) | |
| Raikkula | Estonia | Pentamerus oblongus (193106) | |
| Aeronian | USA (New York) | Pentamerus oblongus (81827 81829 81841 81863 81867 81892 81895 81902 82541) | |
| Aeronian | USA (Iowa) | Pentamerus oblongus (25027 25028) | |
| Aeronian | Norway | Pentamerus oblongus (14309) | |
| Aeronian | Canada (Quebec) | Pentamerus oblongus (163582 184857 184860 184862) | |
| Aeronian - Telychian | USA (New York) | Pentamerus oblongus (26693) | |
| Aeronian - Telychian | USA (Georgia) | Pentamerus oblongus (164677) | |
| Adavere | Estonia (Rapla) | Pentamerus oblongus (175027 206913) | |
| Adavere | Estonia (Viljandi) | Pentamerus oblongus (206918 206921 206922 206930 206940 206944) | |
| Adavere | Estonia (Lääne) | Pentamerus oblongus (175071 195610 195627) | |
| Adavere | Latvia | Pentamerus oblongus (207036) | |
| Adavere | Estonia | Pentamerus oblongus (175037 193124 195607 206957) | |
| Adavere | Estonia (Pärnu) | Pentamerus oblongus (193105 193125) | |
| Adavere | Estonia (Jõgeva) | Pentamerus oblongus (180399) | |
| Telychian | USA (Wisconsin) | Pentamerus oblongus (12991) | |
| Telychian | Russian Federation (Tuva) | Pentamerus oblongus (78713) | |
| Telychian | Canada (Quebec) | Pentamerus oblongus (113301 113313 158740 158765 160003 163586 184867) | |
| Telychian | USA (New York) | Pentamerus oblongus (81871 81879 81913 82504 82516) | |
| Telychian | USA (Iowa) | Pentamerus oblongus (25029 25038) | |
| Wenlock | USA (Wisconsin) | Pentamerus oblongus (12992 12993 12994 12995) | |
| Wenlock | Canada (Québec) | Pentamerus oblongus (25121) |