Rhabdiferoceras

Rhabdiferoceras is an extinct genus of orthocerids belonging to the Baltoceratidae that lived in what would be North America during the Cassinian Stage at the end of the Early Ordovician, existing for approximately two million years from about 474 -472 mya.[1]

Rhabdiferoceras
Temporal range: Lower Ordovician
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: †Orthocerida
Family: †Baltoceratidae
Genus: †Rhabdiferoceras
Flower (1964)
Species
  • R. annuliferum
  • R. planiseptatum

Taxonomy

Rhabdiferoceras was named by Flower (1964). Its type is Rhabdiferoceras annuliferum. It was assigned to Baltoceratidae by Flower (1964) and Hook and Flower (1977).[2][3]

Morphology

Rhabdiferoceras is a rod-bearing baltoceratid with undulations on the dorsal side of the ventral siphuncular rod that correspond to the segments of the siphuncle. Septal necks are very short, connecting rings are layered and are slightly expanded and gently convex from the outside. The genotype, Rhadiferoceras annuliferum Flower is known only from sectioning a limestone block, presumed to be of Cassinian age from the Pogonip Group from the northern end of the Ely Springs Range, Nevada.[2] The siphuncle is rather large, in proportion, and slightly removed from the venter, considered a baltoceratid aspect.

We can only guess at what the animal may have been like or as to its habits. As an orthocerid it may have had 8 or 10 long arms or tentacles projecting from its head, as found in modern squids, belemnites, and indicated for Upper Ordovician Orthonybyoceras and Silurian Michelinoceras.

gollark: ```Coffeehorse Dragons received their name due to their horse-like physique and endearing behavior. They are capable of surviving out of coffee, and when on land their skin secretes a gelatinous goo to retain caffeine. However, their large paddle feet are better suited for swimming, and coffeehorse dragons tend to move very awkwardly when on land. Coffeehorses are very friendly dragons and enjoy playing with humans.```
gollark: It's a coffeehorse.
gollark: Possibly more when you consider the APocalypse hitting the AP around tomorrow.
gollark: At current AP times, it'll take about two and a half days to show up.
gollark: "Oh, I just got this great dragon... but its lineage is {olives/brimstones/something else which people don't like}... I'll need some of those to continue it..."

References
  1. PaleoBiology Database: Rhabdiferoceras, basic info
  2. R. H. Flower. 1964. The Nautiloid Order Ellesmeroceratida (Cephalopoda). State Bureau of Mines and Mineral Resources, New Mexico Institute of Mining and Technology, Memoir 12:234
  3. S. C. Hook and R. H. Flower. 1977. Late Canadian (Zones J, K) cephalopod faunas from Southwestern United States. New Mexico Bureau of Mines and Mineral Resources 32:1-56
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