pforams@mikrotax - Hedbergella primare pforams@mikrotax - Hedbergella primare

Hedbergella primare


Classification: pf_mesozoic -> Hedbergellidae -> Hedbergella -> Hedbergella primare
Sister taxa: << < H. gorbachikae, H. handousi, H. hexacamerata, H. hispaniae, H. infracretacea, H. kuhryi, H. kuznetsovae, H. labocaensis, H. luterbacheri, H. maslakovae, H. mitra, H. modesta, H. occulta, H. praelippa, H. praetrocoidea, H. primare, H. quadricamerata, H. roblesae, H. ruka, H. semielongata, H. sigali, H. similis, H. speetonensis, H. tardita, H. tatianae, H. trocoidea, H. tunisiensis, H. tuschepsensis, H. ventriosa, H. sp.

Taxonomy

Citation: Hedbergella primare (Kretchmar&Gorbachik, in Gorbachik, 1986)
taxonomic rank: Species
Basionym: Clavihedbergella primare

Type images:

Original description: Test very small (major diameter up to 0.17 mm), low-spired. Spiral side of test flat, umbilical side concave. Outline rounded. Test consists of approximately 2 whorls, containing 11-13 chambers. In the first whorl are 5 chambers, in the second 5.5-6. Number of chambers in last whorl also fluctuates between 5.5 and 6. All chambers are spherical. Chambers gradually increase in size as added. Test surface smooth. Septal sutures linear, depressed, straight. Umbilicus broad, deep, aperture equatorial, lips not observed.

Entries in the Catalog of original descriptions: Clavihedbergella primare


Emended description:

Test medium sized, coiled in a very low trochospire; 2 to 2.5 whorls; 6 to 7 chambers in the outer whorl increasing gradually and slowly in size as added; chambers globular to subglobular, the last two or three becoming slightly reniform in lateral view and subtriangular in umbilical view; equatorial periphery circular to subcircular, lobate; sutures depressed, radial mainly straight; umbilical area rather wide and shallow; aperture as a low to medium arch bordered by a lip. Wall smooth, finely perforate. [copied from Chronos database]

Character matrix
test outline:Circularchamber arrangement:Trochospiraledge view:Spiroconvexaperture:
sp chamber shape:Globularcoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:Shallowwall texture:Smoothshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:6-7 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within G. algerianus zone (116.86-118.24Ma, top in Aptian stage). Data source: [copied from Chronos database]
First occurrence (base): within G. blowi zone (120.55-124.40Ma, base in Barremian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Gorbachik, T. N. (1986). Jurassic and early Cretaceous planktonic foraminifera of the south of the USSR. Moscow: Izdat. “Nauka”. 1986: 120-. gs


logo

Hedbergella primare compiled by the pforams@mikrotax project team viewed: 19-6-2024

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/pforams/index.php?id=110258 Go to Archive.is to create a permanent copy of this page - citation notes



Add Comment

* Required information
Captcha Image
Powered by Commentics

Comments

No comments yet. Be the first!