Cymaceras

Last updated

Cymaceras
Temporal range: Kimmeridgian [1]
Scientific classification
Kingdom:
Phylum:
Class:
Subclass:
Order:
Family:
Subfamily:
Genus:
Cymaceras

Quenstedt, 1887

Cymaceras is a genus within the oppeliid subfamily Ochetoceratinae from the Kimmeridgian stage, around the middle of the Upper Jurassic. [2]

Cymaceras is rather unusual in its wavy keel that leans alternatingly to one side then the other. Shells are involute, compressed, with a narrow venter and distinct inner and outer ribs, both sets of which are curved in a concave forward fashion.

Related Research Articles

<span class="mw-page-title-main">Costa Rica</span> Country in Central America

Costa Rica, officially the Republic of Costa Rica, is a country in the Central American region of North America. It borders Nicaragua to the north, the Caribbean Sea to the northeast, Panama to the southeast, and the Pacific Ocean to the southwest, as well as maritime border with Ecuador to the south of Cocos Island. It has a population of around five million in a land area of nearly 51,180 km2 (19,760 sq mi). An estimated 352,381 people live in the capital and largest city, San José, with around two million people in the surrounding metropolitan area.

<span class="mw-page-title-main">Jimmy Carter</span> President of the United States from 1977 to 1981

James Earl Carter Jr. is an American politician and humanitarian who served from 1977 to 1981 as the 39th president of the United States. A member of the Democratic Party, he served from 1963 to 1967 in the Georgia State Senate and from 1971 to 1975 as the 76th governor of Georgia. Carter is the longest-lived president in U.S. history and the first to live to 100 years of age.

<span class="mw-page-title-main">Los Angeles</span> Most populous city in California, United States

Los Angeles, often referred to by its initials L.A., is the most populous city in the U.S. state of California. With an estimated 3,820,914 residents within the city limits as of 2023, It is the second-most populous city in the United States, behind only New York City; it is also the commercial, financial and cultural center of Southern California. Los Angeles has an ethnically and culturally diverse population, and is the principal city of a metropolitan area of 12.8 million people (2023). Greater Los Angeles, which includes the Los Angeles and Riverside–San Bernardino metropolitan areas, is a sprawling metropolis of over 18.3 million residents.

<span class="mw-page-title-main">South America</span> Continent

South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern subregion of the Americas.

<span class="mw-page-title-main">The Rolling Stones</span> English rock band

The Rolling Stones are an English rock band formed in London in 1962. Active for over six decades, they are one of the most popular and enduring bands of the rock era. In the early 1960s, the band pioneered the gritty, rhythmically driven sound that came to define hard rock. Their first stable line-up consisted of vocalist Mick Jagger, guitarist Keith Richards, multi-instrumentalist Brian Jones, bassist Bill Wyman, and drummer Charlie Watts. During their early years, Jones was the primary leader. Andrew Loog Oldham became their manager in 1963 and encouraged them to write their own songs. The Jagger–Richards partnership soon became the band's primary songwriting and creative force.

<span class="mw-page-title-main">Republican Party (United States)</span> American political party

The Republican Party, also known as the GOP, is one of the two major contemporary political parties in the United States. It emerged as the main political rival of the then-dominant Democratic Party in the 1850s, and the two parties have dominated American politics since then.

<span class="mw-page-title-main">Venezuela</span> Country in South America

Venezuela, officially the Bolivarian Republic of Venezuela, is a country on the northern coast of South America, consisting of a continental landmass and many islands and islets in the Caribbean Sea. It comprises an area of 916,445 km2 (353,841 sq mi), and its population was estimated at 29 million in 2022. The capital and largest urban agglomeration is the city of Caracas. The continental territory is bordered on the north by the Caribbean Sea and the Atlantic Ocean, on the west by Colombia, Brazil on the south, Trinidad and Tobago to the north-east and on the east by Guyana. Venezuela is a presidential republic consisting of 23 states, the Capital District and federal dependencies covering Venezuela's offshore islands. Venezuela is among the most urbanized countries in Latin America; the vast majority of Venezuelans live in the cities of the north and in the capital.

<span class="mw-page-title-main">United States Secretary of Defense</span> Head of the US Department of Defense

The United States Secretary of Defense (SecDef) is the head of the United States Department of Defense (DoD), the executive department of the U.S. Armed Forces, and is a high-ranking member of the federal cabinet. The SecDef's position of command and authority over the military is second only to that of the president of the United States, who is the commander-in-chief. This position corresponds to what is generally known as a defense minister in many other countries. The president appoints the SecDef with the advice and consent of the Senate, and is by custom a member of the Cabinet and by law a member of the National Security Council.

<span class="mw-page-title-main">Philadelphia</span> Largest city in Pennsylvania, United States

Philadelphia, colloquially referred to as Philly, is the most populous city in the U.S. state of Pennsylvania and the sixth-most populous city in the United States, with a population of 1,603,797 in the 2020 census. The city is the urban core of the larger Delaware Valley, also known as the Philadelphia metropolitan area, the nation's eighth-largest metropolitan area and seventh-largest combined statistical area with 6.245 million residents and 7.366 million residents, respectively.

<span class="mw-page-title-main">Juris Doctor</span> Graduate-entry professional degree in law

A Juris Doctor, Doctor of Jurisprudence, or Doctor of Law (JD) is a graduate-entry professional degree that primarily prepares individuals to practice law. In the United States, it is the only qualifying law degree. Other jurisdictions, such as Australia, Canada, and Hong Kong, offer both the postgraduate JD degree as well as the undergraduate LL.B., BCL, or other qualifying law degree depending on the requirements of the jurisdiction where the person will practice law.

<span class="mw-page-title-main">Barack Obama</span> President of the United States from 2009 to 2017

Barack Hussein Obama II is an American politician who served as the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African-American president in U.S. history. Obama previously served as a U.S. senator representing Illinois from 2005 to 2008 and as an Illinois state senator from 1997 to 2004.

<span class="mw-page-title-main">Kamala Harris</span> Vice President of the United States since 2021

Kamala Devi Harris is an American politician and attorney who has been the 49th and current vice president of the United States since 2021, serving under president Joe Biden. She is the first female U.S. vice president, making her the highest-ranking female official in U.S. history. She is also the first African American and first Asian American vice president. A member of the Democratic Party, she was the party's nominee in the 2024 presidential election, becoming the second woman nominated for president by a major U.S. political party. From 2017 to 2021, she represented California in the U.S. Senate, and was attorney general of California from 2011 to 2017. From 2004 to 2011, she served as district attorney of San Francisco.

<span class="mw-page-title-main">United States</span> Country in North America

The United States of America (USA), commonly known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal union of 50 states and a federal capital district, Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the states of Alaska to the northwest and the archipelagic Hawaii in the Pacific Ocean. The United States also asserts sovereignty over five major island territories and various uninhabited islands. The country has the world's third-largest land area, largest exclusive economic zone, and third-largest population, exceeding 334 million. Its three largest metropolitan areas are New York, Los Angeles, and Chicago, and its three most populous states are California, Texas, and Florida.

<span class="mw-page-title-main">Donald Trump</span> President-elect and 45th president of the United States

Donald John Trump is an American politician, media personality, and businessman who served as the 45th president of the United States from 2017 to 2021. He won the 2024 election as the nominee of the Republican Party and is now the president-elect of the United States. He is scheduled to begin his second term on January 20, 2025.

<span class="mw-page-title-main">Taylor Swift</span> American singer-songwriter (born 1989)

Taylor Alison Swift is an American singer-songwriter. Known for her biographical songwriting, artistic reinventions, and cultural impact, Swift is a leading figure in popular music and the subject of widespread public interest.

<span class="mw-page-title-main">2016 United States presidential election</span> 58th quadrennial U.S. presidential election

The 2016 United States presidential election was the 58th quadrennial presidential election, held on Tuesday, November 8, 2016. The Republican ticket of businessman Donald Trump and Indiana governor Mike Pence defeated the Democratic ticket of former secretary of state and former first lady Hillary Clinton and Virginia junior senator Tim Kaine, in what was considered one of the biggest political upsets in American history. It was the fifth and most recent presidential election in which the winning candidate lost the popular vote. It was also the sixth and most recent presidential election in U.S. history in which both major party candidates were registered in the same home state; the others have been in 1860, 1904, 1920, 1940, and 1944.

<span class="mw-page-title-main">Bruno Mars</span> American musician (born 1985)

Peter Gene Hernandez, known professionally as Bruno Mars, is an American singer-songwriter. He is known for his stage performances, retro showmanship, and for singing in a wide range of musical styles, including pop, R&B, funk, soul, reggae, disco, and rock. Mars is accompanied by his band, the Hooligans, whose members are also backup singers and dancers. In 2021, Mars and fellow singer Anderson .Paak formed the musical superduo Silk Sonic.

The Ochetoceratinae is a subfamily within the Oppeliidae from the Upper Jurassic, shells of which are typically oxycones with a tricarinate venter and falcoid ribbing, commonly divided by a median lateral groove or fillet. The median (middle) keel is the tallest.

References

Notes
  1. Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Archived from the original on 2016-02-25. Retrieved 2017-10-18.
  2. "Paleobiology Database - Cymaceras" . Retrieved 2017-10-19.
Bibliography

W.J. Arkell, et al., 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleongology, Part L. Geological Society of America and University of Kansas Press.