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Lyropecten
Taxonomy
Lyropecten was named by Conrad (1862) [Sepkoski's age data: T Ol-l T Plio Sepkoski's reference number: 1112].
It was reranked as Pecten (Lyropecten) by Dall (1898), Arnold (1906), Grant and IV and Gale (1931); it was reranked as Chlamys (Lyropecten) by Gardner (1943), Dockery (1982).
It was assigned to Pecten by Dall (1898), Arnold (1906), Grant and IV and Gale (1931); to Chlamys by Gardner (1943), Dockery (1982); to Pectinidae by Addicott (1974), Moore (1984), Smith (1991), Perrilliat (1994); and to Pterioida by Sepkoski (2002).
It was reranked as Pecten (Lyropecten) by Dall (1898), Arnold (1906), Grant and IV and Gale (1931); it was reranked as Chlamys (Lyropecten) by Gardner (1943), Dockery (1982).
It was assigned to Pecten by Dall (1898), Arnold (1906), Grant and IV and Gale (1931); to Chlamys by Gardner (1943), Dockery (1982); to Pectinidae by Addicott (1974), Moore (1984), Smith (1991), Perrilliat (1994); and to Pterioida by Sepkoski (2002).
Species
Chlamys (Lyropecten) duncanensis, Chlamys (Lyropecten) ernestsmithi, Chlamys (Lyropecten) menthifontis, Chlamys (Lyropecten) planicosta, L. catalinae, L. cerrosensis (syn. Pecten (Lyropecten) ashleyi), L. condylomatus, L. crassicardo (syn. Pecten (Pallium) holwayi, Swiftopecten adekunbiana, Pecten crassicardo nomlandi, Pecten (Lyropecten) ricei, Pecten crassicardo biformatis, Pecten (Lyropecten) vickeryi), L. denaius, L. dumblei, L. gallegosi, L. laekeniensis, L. miguelensis, L. modulatus, L. pittieri, L. pretiosus (syn. Pecten (Lyropecten) miguelensis submiguelensis), L. septemplicatus, L. tamiamiensis, L. terminus, L. tiburonensis, L. vaughani
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1862 | Lyropecten Conrad p. 291 |
| 1898 | Pecten (Lyropecten) Dall p. 724 |
| 1906 | Pecten (Lyropecten) Arnold p. 49 |
| 1931 | Pecten (Lyropecten) Grant, IV and Gale p. 175 |
| 1943 | Chlamys (Lyropecten) Gardner p. 32 |
| 1974 | Lyropecten Addicott p. 180 |
| 1982 | Chlamys (Lyropecten) Dockery p. 44 |
| 1984 | Lyropecten Moore p. B49 |
| 1991 | Lyropecten Smith p. 43 |
| 1994 | Lyropecten Perrilliat |
| 2002 | Lyropecten Sepkoski |
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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. †Lyropecten Conrad 1862
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†Chlamys (Lyropecten) duncanensis Mansfield 1934
†Chlamys (Lyropecten) ernestsmithi Tucker 1931
†Chlamys (Lyropecten) menthifontis Glawe 1970
†Chlamys (Lyropecten) planicosta Gardner 1943
†Lyropecten catalinae Arnold 1906
†Lyropecten cerrosensis Gabb 1866
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Invalid names: Pecten (Lyropecten) ashleyi Arnold 1906 [synonym]
†Lyropecten condylomatus Dall 1898
†Lyropecten crassicardo Conrad 1856
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Invalid names: Pecten (Lyropecten) ricei Trask 1922 [synonym], Pecten (Lyropecten) vickeryi Trask 1922 [synonym], Pecten (Pallium) holwayi Clark 1915 [synonym], Pecten crassicardo biformatis Nomland 1917 [synonym], Pecten crassicardo nomlandi Hertlein 1931 [synonym], Swiftopecten adekunbiana Adegoke 1969 [synonym]
†Lyropecten denaius Woodring 1982
†Lyropecten dumblei Gardner 1945
†Lyropecten gallegosi Jordan and Hertlein 1926
†Lyropecten laekeniensis Vincent 1881
†Lyropecten miguelensis Arnold 1906
†Lyropecten modulatus Hertlein 1925
†Lyropecten pittieri Dall 1912
†Lyropecten pretiosus Hertlein 1925
†Lyropecten septemplicatus Nilsson 1827
†Lyropecten tamiamiensis Mansfield 1932
†Lyropecten terminus Arnold 1906
†Lyropecten tiburonensis Smith 1991
†Lyropecten vaughani Arnold 1906
†Pecten (Lyropecten) vaughani emigdioensis Wagner and Schilling 1923
Invalid names: Pecten (Lyropecten) miguelensis submiguelensis Loel and Corey 1932 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. T. Smith 1991 | Valves circular in outline, equally convex in profile; moderately flat to gibbous, some species tending to have rounded or angular ledges. Radiating ribs or- namented by radial costae in most taxa (but not the type species); interspaces with one or more radial riblets cross- ed by concentric lirae or growth lines. Auricles subequal, costate, and lirate, hinge line less than half shell length. Byssal notch moderately deep, ctenolium present in juveniles, preserved in some adults. Three pairs of hinge teeth in right valves, two pairs in left valves. Some species with regularly spaced ribs, others with prominent key ribs arranged in patterns characteristic of different phylo- genetic lineages within the genus. Some of the species with key ribs also have nodes.Similar to Nodipecten in valve outline and profile, hinge characters, ctenolium, and fine sculpture; unlike Nodi- pecten in having nearly equal auricles, a shallow byssal notch, and regularly spaced ribs rather than left valve ribs and right valve interspaces of alternating widths. Most species lack nodes, but in the group including L. crassicardo and L. magnificus, hollow nodes evolved over time from elongate thickenings along key ribs. Nodipecten nodes are commonly larger and bulbous. Lyropecten differs in growth form and proportions from "Macrochlamis," which is represented in California by taxa hav- ing large auricles, hinge lines greater than half the shell length, a shallow byssal notch, and no tendency to develop ledges, key ribs or nodes. Vertipecten has many characters that distinguish it from Lyropecten: a convex left valve and flat right valve, the number and character of imbricated ribs, shagreen microsculpture, deep byssal notch, and a smooth hinge area lacking crura. |