Ammonicera benhami Squires & Goedert, 1996

Chernyshev, Alexei V. & Goedert, James L., 2021, New species of latest Eocene / earliest Oligocene microgastropods (Heterobranchia Orbitestellidae and Omalogyridae) from the Gries Ranch Formation, Lewis County, Washington State, USA, Zootaxa 4981 (3), pp. 469-480 : 474-475

publication ID

https://doi.org/ 10.11646/zootaxa.4981.3.3

publication LSID

lsid:zoobank.org:pub:CB36C384-5538-494A-8802-4F821C7E25FE

DOI

https://doi.org/10.5281/zenodo.5109636

persistent identifier

https://treatment.plazi.org/id/038287AE-C147-174D-FF7F-593508CD0D0A

treatment provided by

Plazi

scientific name

Ammonicera benhami Squires & Goedert, 1996
status

 

Ammonicera benhami Squires & Goedert, 1996

Figure 3A–E View FIGURE 3

Ammonicera benhami Squires & Goedert, 1996, p. 235 , figs. 27–32.

Examined material. MIMB 41136 View Materials (lot of 3 specimens), and one specimen , SBMNH 467057 About SBMNH , all from the type locality. One additional specimen , SBMNH 467058 About SBMNH , from LACMIP loc. 16940 [Crescent/McIntosh Formation transition zone of Squires & Goedert (1995)] is herein tentatively identified as A. benhami .

Type material. Holotype: LACMIP 11368 ; Paratypes: LACMIP 11369–11371 .

Type locality. LACMIP loc. 16655, Larch Mountain , Black Hills , Washington State, USA; Crescent Formation, middle early Eocene .

Emended diagnosis. Ammonicera with protoconch sculptured by two spiral cords (prominent central and low outer) separated by a spiral groove; teleoconch with one wide subperipheral groove and low subperipheral cord on both apical and basal surfaces, and prominent nodelike axial ribs.

Remarks. The size range of A. benhami is 0.4 to 0.59 mm in diameter (Squires & Goedert 1996); specimen MIMB 41136–1 ( Fig. 3A View FIGURE 3 ) has a diameter of 0.50 mm. Ammonicera benhami is only known from three localities, two in the Black Hills southwest of Olympia, Washington, and now tentatively from a single locality (weathered and no longer accessible) in the Doty Hills, Lewis County, Washington. The two localities in the Black Hills represent deposition between basalt boulders within the tidal zone ( Squires & Goedert 1994, 1996) whereas the Doty Hills localities may represent shallow water taxa transported a short distance into deeper waters off volcanic islands ( Squires & Goedert 1995).

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Heterostropha

Family

Omalogyridae

Genus

Ammonicera

Loc

Ammonicera benhami Squires & Goedert, 1996

Chernyshev, Alexei V. & Goedert, James L. 2021
2021
Loc

Ammonicera benhami

Squires & Goedert 1996: 235
1996
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