Hammatoceratidae

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Hammatoceratidae
Temporal range: Hettangian–Callovian
Ammonitida - Hammatoceras porcarellense.JPG
Fossil of Geczyceras porcarellense
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Superfamily: †Hildoceratoidea
Family: †Hammatoceratidae
Buckman, 1887
Subfamilies

See text

Hammatoceratidae is a family of lower and middle Jurassic ammonites included in the superfamily Hildoceratoidea.[1]

Diagnosis[]

Hammatoceratidae comprises genera which are characterized by ribbed evolute shells (all whorls visible), some bearing keels along the venter.[2] Those in the Phymatoceratinae have more simple ribbing while those in the Hammatoceratinae have ribbing that branch higher up on the whorl sides, divided into primaries and secondaries.

Taxonomy[]

In the outdated classification of the 1957 American Treatise on Invertebrate Paleontology, Hammatoceratidae was included in the superfamily Hildoceratoidea and divided into two subfamilies, the earlier Phymatoceratinae, and later Hammatoceratinae.[2]

Hammatoceratidae is now divided into four subfamilies,[3] the , , , and .

Hammatoceratinae includes Rarenodia, Geczyceras, Bredyia, , , Euaptetoceras, Eudmetoceras, Fissilobiceras, Hammatoceras, , , , , and .[3] Fissilobiceras, included in the Sonniniidae in the Treatise, 1957,[2] differs from typical hammatoceratids in being rather involude and smooth shelled.

The Erycitinae is said to include , , Abbasitoides, Shahrudites and . The Treatise Part L, 1957, includes Erycites and Abbasites in the Hammatoceratinae. Cagliceras, named by Rulleau and Elmi, was added in 2001.

Podagrosiceratinae named by Westermann and Riccardi, 1979, includes Maubeuge and Lambert, 1956, , and . D.T. Donovan, et al.,1981[4] recognized Sphaerocoeloceras as a hammatoceratid rather than a as in the Treatise.[2] Zurcheriinae, Hyatt 1900, includes Zurcheria, H.Douville, 1885, Haplopleuroceras, , and . Zurcheria and Haplopleuroceras are included in the Sonniniidae in the Treatise Part L.

Evolution and Phylogeny[]

The Hammatoceratidae with its four subfamilies has its origin in the Phymatoceratidae, with the subfamily Hammatoceratinae giving rise to the subfamilies Erycitinae and Podagrosiceratinae. If Zurcheria and Haplopleuroceras belong in the Sonniniidae, the Zurcheriinae must thereby be derived and therefore belongs to the Sonniniidae.[2][4]

References[]

  1. ^ "Fossilworks: Hammatoceratidae". fossilworks.org. Retrieved 2015-05-27.
  2. ^ a b c d e W.J.Arkell et al., 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology Part L
  3. ^ a b Hammatoceratidae in Fossilworks
  4. ^ a b Classification of the Jurassic Ammonitina, in The Ammonoidea, M.R House & J.R. Senior, (eds), Academic Press
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