Definition of rudist in English:

rudist

(also rudistid)

noun ˈruːdɪstˈrudɪst

A cone-shaped fossil bivalve mollusc which formed colonies resembling reefs in the Cretaceous period.
厚壳蛤类（在白垩纪时期构成生物礁的一种锥形的化石双壳类软体动物）
Superfamily Rudistacea, order Hippuritoida
Example sentencesExamples
- Aptian reefs were typically composed of rudists.
- This member contains abundant and diverse mid-Cretaceous shallow-marine invertebrates, including reef corals and rudist bivalves.
- Data from the Pacific Ocean on the distribution of rudists on carbonate platforms confirm that biocalcification crises in shallow-water settings were truly global.
- The limestone clasts contain rudist fragments and larger foraminifera that indicate erosion from the Campur Formation.
- The seas were inhabited by large ammonoids like Olcostephanus, bivalves like Bruchia, and (in selected areas) some of the early rudist reefs.
- Many rudist species were defined on specimens collected from the El Abra Formation in Mexico, a widespread carbonate platform.
- Most of the characteristic life forms of the Cretaceous had not yet evolved or were insignificant, including angiosperms, mosasaurs, therian mammals, hadrosaurs, rudists, calcareous plankton and planktonic foraminifera.
- Most of the rudist species listed by these authors are typical late Albian taxa, but their purported occurrences here require additional study and supportive documentation.
- An extinct group of Mesozoic bivalves, the rudistids, became closely adapted to a cemented mode of life: one valve became conical while the other formed a lid.
- Cretaceous radiations of rudists were apparently initiated during periods of globally high sea level and the Lebanon decapod faunas are a part of this general increasing invertebrate diversity.
- These two species are not as yet known to be associated with rudists or corals, although a few specimens of both rudists and corals have been recovered from other localities of Turonian age in the Santa Ana Mountains.

Origin

Late 19th century: from modern Latin Rudista (former group name), from Latin rudis 'rude'; for the variant spelling see -id³.

Definition of rudist in US English:

rudist

(also rudistid)

nounˈro͞odistˈrudɪst

A cone-shaped extinct bivalve mollusk that formed colonies resembling reefs in the Cretaceous period.
厚壳蛤类（在白垩纪时期构成生物礁的一种锥形的化石双壳类软体动物）
Superfamily Rudistacea, order Hippuritoida
Example sentencesExamples
- Most of the characteristic life forms of the Cretaceous had not yet evolved or were insignificant, including angiosperms, mosasaurs, therian mammals, hadrosaurs, rudists, calcareous plankton and planktonic foraminifera.
- An extinct group of Mesozoic bivalves, the rudistids, became closely adapted to a cemented mode of life: one valve became conical while the other formed a lid.
- Aptian reefs were typically composed of rudists.
- This member contains abundant and diverse mid-Cretaceous shallow-marine invertebrates, including reef corals and rudist bivalves.
- The limestone clasts contain rudist fragments and larger foraminifera that indicate erosion from the Campur Formation.
- These two species are not as yet known to be associated with rudists or corals, although a few specimens of both rudists and corals have been recovered from other localities of Turonian age in the Santa Ana Mountains.
- Most of the rudist species listed by these authors are typical late Albian taxa, but their purported occurrences here require additional study and supportive documentation.
- The seas were inhabited by large ammonoids like Olcostephanus, bivalves like Bruchia, and (in selected areas) some of the early rudist reefs.
- Cretaceous radiations of rudists were apparently initiated during periods of globally high sea level and the Lebanon decapod faunas are a part of this general increasing invertebrate diversity.
- Data from the Pacific Ocean on the distribution of rudists on carbonate platforms confirm that biocalcification crises in shallow-water settings were truly global.
- Many rudist species were defined on specimens collected from the El Abra Formation in Mexico, a widespread carbonate platform.

Origin

Late 19th century: from modern Latin Rudista (former group name), from Latin rudis ‘rude’; for the variant spelling see -id.

单词	rudist
释义	Definition of rudist in English: rudist (also rudistid) noun ˈruːdɪstˈrudɪst A cone-shaped fossil bivalve mollusc which formed colonies resembling reefs in the Cretaceous period. 厚壳蛤类（在白垩纪时期构成生物礁的一种锥形的化石双壳类软体动物） Superfamily Rudistacea, order Hippuritoida Example sentencesExamples Aptian reefs were typically composed of rudists. This member contains abundant and diverse mid-Cretaceous shallow-marine invertebrates, including reef corals and rudist bivalves. Data from the Pacific Ocean on the distribution of rudists on carbonate platforms confirm that biocalcification crises in shallow-water settings were truly global. The limestone clasts contain rudist fragments and larger foraminifera that indicate erosion from the Campur Formation. The seas were inhabited by large ammonoids like Olcostephanus, bivalves like Bruchia, and (in selected areas) some of the early rudist reefs. Many rudist species were defined on specimens collected from the El Abra Formation in Mexico, a widespread carbonate platform. Most of the characteristic life forms of the Cretaceous had not yet evolved or were insignificant, including angiosperms, mosasaurs, therian mammals, hadrosaurs, rudists, calcareous plankton and planktonic foraminifera. Most of the rudist species listed by these authors are typical late Albian taxa, but their purported occurrences here require additional study and supportive documentation. An extinct group of Mesozoic bivalves, the rudistids, became closely adapted to a cemented mode of life: one valve became conical while the other formed a lid. Cretaceous radiations of rudists were apparently initiated during periods of globally high sea level and the Lebanon decapod faunas are a part of this general increasing invertebrate diversity. These two species are not as yet known to be associated with rudists or corals, although a few specimens of both rudists and corals have been recovered from other localities of Turonian age in the Santa Ana Mountains. Origin Late 19th century: from modern Latin Rudista (former group name), from Latin rudis 'rude'; for the variant spelling see -id³. Definition of rudist in US English: rudist (also rudistid) nounˈro͞odistˈrudɪst A cone-shaped extinct bivalve mollusk that formed colonies resembling reefs in the Cretaceous period. 厚壳蛤类（在白垩纪时期构成生物礁的一种锥形的化石双壳类软体动物） Superfamily Rudistacea, order Hippuritoida Example sentencesExamples Most of the characteristic life forms of the Cretaceous had not yet evolved or were insignificant, including angiosperms, mosasaurs, therian mammals, hadrosaurs, rudists, calcareous plankton and planktonic foraminifera. An extinct group of Mesozoic bivalves, the rudistids, became closely adapted to a cemented mode of life: one valve became conical while the other formed a lid. Aptian reefs were typically composed of rudists. This member contains abundant and diverse mid-Cretaceous shallow-marine invertebrates, including reef corals and rudist bivalves. The limestone clasts contain rudist fragments and larger foraminifera that indicate erosion from the Campur Formation. These two species are not as yet known to be associated with rudists or corals, although a few specimens of both rudists and corals have been recovered from other localities of Turonian age in the Santa Ana Mountains. Most of the rudist species listed by these authors are typical late Albian taxa, but their purported occurrences here require additional study and supportive documentation. The seas were inhabited by large ammonoids like Olcostephanus, bivalves like Bruchia, and (in selected areas) some of the early rudist reefs. Cretaceous radiations of rudists were apparently initiated during periods of globally high sea level and the Lebanon decapod faunas are a part of this general increasing invertebrate diversity. Data from the Pacific Ocean on the distribution of rudists on carbonate platforms confirm that biocalcification crises in shallow-water settings were truly global. Many rudist species were defined on specimens collected from the El Abra Formation in Mexico, a widespread carbonate platform. Origin Late 19th century: from modern Latin Rudista (former group name), from Latin rudis ‘rude’; for the variant spelling see -id.
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