| Home> Cenozoic> Miocene>
 

List species

Cycladophora bicornis amphora Lombari and Lazarus, 1988

Description - Add description

Description: Cephalis is simple, of medium size, hemispherical with numerous subcireular pores and two thornless, bladed apical horns. Horn length is 1-1.5 times the diameter of the cephalis. Cephalis is depressed into the upper thorax creating a fairly well-developed spinal furrow. Lateral spines are not usually expressed externally. Upper thorax is elongate to equant, narrowly flared, and flat in outline. Pores are subcircular to irregular in shape, small though non-uniform in size and the last few rows are aligned horizontally. There is no obvious pore size gradient. Pores arc open with narrow pore bars of moderate thickness. Pore bars are free of ornamentation. Upper thorax suture is shouldered. Lower thorax is elongate to equant, narrowly flared, and flat in outline with hexagonal pores. Pores arc medium to large in size and aligned in staggered horizontal rows. A gradual, strong pore size gradient increases distally. Pores are open with narrow pore bars of moderate thickness. There are no spines, costae or sponge present. Lower thoracic suture is slightly constricted. Abdomen or terminal segment is composed of one row of very small subcireular pores at the lower thoracic suture followed by one or more horizontal rows of irregularly shapedpores. Abdominal termination is ragged with one row of short basal spines. No basal plate is observed.
Type: DSDP Site 278. core 9-CC. England finder number Y7/3.
Origin of name: From the Latin noun amphora, bottle. Named so for the bottle-neck shape of the upper thorax.
Comments: Cycladophora b. amphora is distinguished by its well-developed elongated upper thorax. It is somewhat similar to C. c subhumerus. However, C. b. amphora has a stronger proximal inflation to the lower thorax, a row of very small pores at the junction of the lower thorax and abdomen, and lacks the external secondary spines and other ornamentation commonly seen in C. c. subhumerus. Cycladophora c. subhumerus also has smaller lower thorax width and upper thorax length dimensions than does C. b. amphora (text-fig. 4).
Lombari & Lazarus 1988


Description

 

Images

 

Synonyms

 

References

 

Distribution

 

Discussion / Comments

 

Web links