New to LiveAuctioneers?

Argonauticeras besairiei ammonite with prepared septum

Description

Title: Argonauticeras besairiei ammonite with prepared septum

Origin: Madagascar

Size: 21 cm diameter

Description: Species: Argonauticeras besairiei
Age: Cretaceous, Albian
Locality: Mahajanga Basin, Madagascar

Measurements: 21 cm diameter - 9 cm breadth
Weight: 3.7 kg

Superb polished ammonite with beautiful suture lines and pinkish shell. The last preserved septum has been prepared to reveal its characteristic shape.
An uncommon species that is rare in this size. Minor cracks were filled prior to polishing.

Reserve: $650.00

Shipping:

Domestic: Flat-rate of $90.00 to anywhere within the contiguous U.S.

International: Foreign shipping rates are determined by destination. International shipping may be subject to VAT.

Combined shipping: Please ask about combined shipping for multiple lots before bidding.

Location: This item ships from France.

Your purchase is protected:
In the rare event that the item did not conform to the lot description in the sale, Chairish Auctions specialists are here to help. Buyers may return the item for a full refund provided you notify Chairish Auctions within 5 days of receiving the item.

Buyer's Premium

20%

Argonauticeras besairiei ammonite with prepared septum

Lot 0012

Estimate $800-$1,000

Mar 25, 2026, 6:11 PM EDT

Starting Price

Secure

$320

LiveAuctioneers Purchase Protection

Vetted auction houses

Secure, online bidding

Returns guaranteed for misrepresented listings

Dedicated support when you need it

Fossilized Ammonites, Trilobites, and More!

Mar 18, 2026 12:00 PM EDT

New York, NY, United States

Featured

Slab with 13 Conulus subrotundus: Title: Slab with 13 Conulus subrotundusOrigin: GermanySize: 18 x 13 x 4 cm slabDescription: Species: Conulus subrotundus Age: Turonian, Cretaceous Locality: Wullen, Germany Measurements: 18 x 13 x 4

Slab with 13 Conulus subrotundus

Featured

Beautiful 18 cm ammonite Douvilleiceras mammillatum: Title: Beautiful 18 cm ammonite Douvilleiceras mammillatumOrigin: MadagascarSize: c. 18 cm diameterDescription: Species: Douvilleiceras mammillatum Age: Albian, Cretaceous Locality: Mahajanga,

Beautiful 18 cm ammonite Douvilleiceras mammillatum

Featured

Outstanding Koneprusia and Phacops combo: Title: Outstanding Koneprusia and Phacops comboOrigin: MoroccoSize: c. 4.1 cm long (trilobite) - c. 11 x 7.5 cm (matrix)Description: Species: Koneprusia sp. and "Phacops" sp. Age: Devonian Locality:

Outstanding Koneprusia and Phacops combo

Featured

Finest trilobite Drotops megalomanicus: Title: Finest trilobite Drotops megalomanicusOrigin: MoroccoSize: c. 15 cm long (trilobite - if outstretched)Description: Species: Drotops megalomanicus Age: Devonian Locality: Morocco Measurements:

Finest trilobite Drotops megalomanicus

Featured

Large Nautilid - Cymatoceras sakalavus: Title: Large Nautilid - Cymatoceras sakalavusOrigin: MadagascarSize: c. 21 cm diameterDescription: Species: Cymatoceras sakalavus Age: Albian, Cretaceous Locality: Mahajanga, Madagascar

Large Nautilid - Cymatoceras sakalavus

Featured

Beautiful trilobite duo of Gerastos sp.: Title: Beautiful trilobite duo of Gerastos sp.Origin: MoroccoSize: c. 19 and 25 mm long trilobitesDescription: Species: Gerastos sp. Age: Middle Devonian Locality: Morocco Measurements: c. 19 and 25

Beautiful trilobite duo of Gerastos sp.

Featured

Flying-prepared Cyphaspis with Hollardops and Phacops trilobites: Title: Flying-prepared Cyphaspis with Hollardops and Phacops trilobitesOrigin: MoroccoSize: c. 33 mm long (Cyphaspis) - c. 12 x 9.5 x 6.5 cm (matrix)Description: Species: Cyphaspis, Hollardops and

Flying-prepared Cyphaspis with Hollardops and Phacops trilobites

Featured

10.5 cm Douvilleiceras inaequinodum with gastropod: Title: 10.5 cm Douvilleiceras inaequinodum with gastropodOrigin: MadagascarSize: 10.5 cm diameterDescription: Species: Douvilleiceras inaequinodum Age: Albian, Cretaceous Locality: Mahajanga,

10.5 cm Douvilleiceras inaequinodum with gastropod

Fine coelacanth fish Whiteia uyenoteruyai: Title: Fine coelacanth fish Whiteia uyenoteruyaiOrigin: MadagascarSize: c. 23.5 cm longDescription: Species: Whiteia uyenoteruyai Age: lower Triassic Locality: Madagascar Measurements: c. 23.5 cm

Fine coelacanth fish Whiteia uyenoteruyai

Polished Ammonite with highlighted suture lines - Aioloceras besairiei: Title: Polished Ammonite with highlighted suture lines - Aioloceras besairieiOrigin: MadagascarSize: 13.5 cm diameterDescription: Species: Aioloceras besairiei Age: Cretaceous, Albian Locality:

Polished Ammonite with highlighted suture lines - Aioloceras besairiei

Rare trilobite Kettneraspis dickinsoni: Title: Rare trilobite Kettneraspis dickinsoni Origin: Morocco Size: c. 3.1 cm long trilobite Description: Species: Kettneraspis dickinsoni Age: Devonian Locality: Morocco Measurements: c. 3.1 cm long

Rare trilobite Kettneraspis dickinsoni

38 cm Ammonite Euaspidoceras with superb suture patterns: Title: 38 cm Ammonite Euaspidoceras with superb suture patterns Origin: Madagascar Size: c. 38 cm diameter Description: Species: Euaspidoceras sp. Age: Jurassic, Oxfordian Locality: Sakaraha, Madagasc

38 cm Ammonite Euaspidoceras with superb suture patterns

20 cm spiny ammonite Mammites nodosoides: Title: 20 cm spiny ammonite Mammites nodosoides Origin: Morocco Size: 20 cm diameter Description: Species: Mammites nodosoides Age: Cretaceous, Turonian Locality: Asfla, Morocco Measurements: 20 cm di

20 cm spiny ammonite Mammites nodosoides

Large polished nacreous Ammonite - Douvilleiceras mammillatum: Title: Large polished nacreous Ammonite - Douvilleiceras mammillatum Origin: Madagascar Size: c. 28 cm diameter Description: Species: Douvilleiceras sp. Age: Albian, Cretaceous Locality: Mahajanga, Ma

Large polished nacreous Ammonite - Douvilleiceras mammillatum

Gorgeous trilobite combo - "flying" Crotalocephalina gr. gibbus and Phacopid: Title: Gorgeous trilobite combo - "flying" Crotalocephalina gr. gibbus and Phacopid Origin: Morocco Size: c. 8.9 cm long (Crotalocephalina) Description: Species: Cheirurus (Crotalocephalina) gr. gibbu

Gorgeous trilobite combo - "flying" Crotalocephalina gr. gibbus and Phacopid

24.5 cm ammonite Choffaticeras segne: Title: 24.5 cm ammonite Choffaticeras segne Origin: Morocco Size: 24.5 cm diameter Description: Species: Choffaticeras segne Age: Cretaceous, Turonian Locality: Asfla, Morocco Measurements: 24.5 cm di

24.5 cm ammonite Choffaticeras segne

9.5 cm nacreous ammonite Aioloceras besairiei: Title: 9.5 cm nacreous ammonite Aioloceras besairiei Origin: Madagascar Size: 9.5 cm diameter Description: Species: Aioloceras besairiei Age: Cretaceous, Albian Locality: Mahajanga, Madagascar Measure

9.5 cm nacreous ammonite Aioloceras besairiei

Magnificent 36.5 cm ammonite - Prososphinctes sp.: Title: Magnificent 36.5 cm ammonite - Prososphinctes sp. Origin: Madagascar Size: 36.5 cm diameter Description: Species: Prososphinctes sp. Age: Jurassic, Oxfordian Locality: Sakaraha, Madagascar Meas

Magnificent 36.5 cm ammonite - Prososphinctes sp.

Finest small trilobite Dactylocephalus sp.: Title: Finest small trilobite Dactylocephalus sp. Origin: Morocco Size: c. 20 mm long trilobite Description: Species: Dactylocephalus sp. Age: Ordovician Locality: Zagora-Tata area, Morocco Measuremen

Finest small trilobite Dactylocephalus sp.

Wonderful 16.4 cm nacreous Ammonite - Aioloceras besairiei: Title: Wonderful 16.4 cm nacreous Ammonite - Aioloceras besairiei Origin: Madagascar Size: 16.4 cm diameter Description: Species: Aioloceras besairiei Age: Cretaceous, Albian Locality: Mahajanga, Mada

Wonderful 16.4 cm nacreous Ammonite - Aioloceras besairiei

Related Searches

Crystal Minerals Fossil Specimen Fossils and Minerals geological geology Mineral Rocks Mineral Specimens Mineralized Fossil Rare Rocks rock collection Price Results Auctions in New York

TOP