''Aethiosolen'' is a genus of

orthocerid Orthocerida, from Ancient Greek ὀρθός (''orthós''), meaning "straight", and κέρας (''kéras''), meaning "horn", also known as the Michelinocerida, is an order of extinct orthoceratoid cephalopods that lived from the Early Ordovician ...

s in the family

Orthoceratidae Orthoceratidae, from Ancient Greek ὀρθός (''orthós''), meaning "straight", and κέρας (''kéras''), meaning "horn", is an extinct family of actively mobile carnivorous cephalopods, subclass Nautiloidea, that lived in what would be Nort ...

with an annulated

orthoconic An orthocone is the long, cone-shaped shell belonging to several species of ancient nautiloid cephalopod—the prehistoric ancestors of today's marine cephalopod mollusks, including the cuttlefishes, nautiluses, octopuses and squids.; During the ...

shell. Annuli, transverse elevations on the shell, are broad and of low amplitude with spacings in the range of 4 to 6 mm and height of less than 1 mm.

Camera A camera is an instrument used to capture and store images and videos, either digitally via an electronic image sensor, or chemically via a light-sensitive material such as photographic film. As a pivotal technology in the fields of photograp ...

e (chambers) are short, septal spacing on the order of 3 to 4 mm. The

siphuncle The siphuncle is a strand of biological tissue, tissue passing longitudinally through the mollusc shell, shell of a cephalopod mollusc. Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the li ...

is wide and tubular, width equal to or greater than septal spacing. Position is central or subcentral in early segments, subventral in later adult. Shells typically are narrowly conical. ''Aethiosolen'' was named by Rousseau Flower in 1968 along with four species. The genotype which comes from the Table Head beds in Newfoundland is ''A. whittingtoni'' (Flower). Type specimens are at the

Museum of Comparative Zoology The Museum of Comparative Zoology (formally the Agassiz Museum of Comparative Zoology and often abbreviated to MCZ) is a zoology museum located on the grounds of Harvard University in Cambridge, Massachusetts. It is one of three natural-history r ...

at Harvard University. Also from Newfoundland is ''A. priamus'', renamed from ''Orthoceras priamus'' Billings 1865.

Holotype A holotype (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of s ...

also at the Museum of Comparative Zoology. The other two, ''A. kayi'' and ''A. cylindricus'', both also named by Flower, came from the Antelope Valley Limestone in Ikes Canyon in the Toquima Range,

Nevada Nevada ( ; ) is a landlocked state in the Western United States. It borders Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. Nevada is the seventh-most extensive, th ...

. The holotype of ''A. kayi'' was placed at Columbia University. ''A. cylindricus'' is in the collection of the New Mexico Museum of Natural History and Science in

Albuquerque Albuquerque ( ; ), also known as ABQ, Burque, the Duke City, and in the past 'the Q', is the List of municipalities in New Mexico, most populous city in the U.S. state of New Mexico, and the county seat of Bernalillo County, New Mexico, Bernal ...

. Also there is an unidentified species of ''Aethiosolen'' with an affinity to ''Aethiosolen kayi'' and from the same locality.

References

* Rousseau H Flower, (1968). Some Additional Whiterock Cephalopods. Part II, Memoir 19. New Mexico Bureau of Mines and Mineral Resources. Socorro. {{Taxonbar, from=Q4688711 Prehistoric nautiloid genera Taxa named by Rousseau H. Flower