Abyssomelania cramptoni
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Kaim2014Zootaxa3861, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Kaim2014Zootaxa3861">{{Citation |
Ordo: Archaeogastropoda
Familia: Melanodrymiidae
Genus: Abyssomelania
Name
Abyssomelania cramptoni – Wikispecies link – Pensoft Profile
- Abyssomelania cramptoni Kaim, Andrzej, 2014, Zootaxa 3861: 414-416.
Materials Examined
Type locality and strata: Seep limestone from the south end of Waipiro Bay, North Island, New Zealand;. For Campanian (Late Cretaceous). For details see Kiel et al. (2013). Holotype: GNS TM 8852, four well-preserved adolescent whorls, 28.7 mm high and 12.8 mm wide. Paratypes: GNS TM 8850, - 51, - 53, well to moderately preserved adolescent shells; GNS TM 8927, juvenile shell. Additional material: 5 fragmentary specimens from the type locality.
Diagnosis
Diagnosis. Tall gastropods (reaching 30 mm in length) with smooth lateral flanks of the adolescent/adult shell and spirally ornamented base. The growth lines opisthocline with angulation in the upper part of the lateral flank. The largest diameter of the whorls in the lower part of the lateral flank.
Description
Description. Tall shell with largest whorl diameter slightly above abapical suture. Protoconch unknown. Juvenile teleoconch ornamented by opisthocline axial ribs and delicate striae. Axial ribs fading out in adolescent shell, adult shell surface smooth apart from opisthocline growth lines and abyssomelanid riblets appearing at the terminal (?) teleoconch whorl. Shell base ornamented by ten spiral ribs intersected by growth lines without knobs. Suture weakly incised. Aperture poorly preserved, D-shaped.
Discussion
Remarks. This species was preliminarily identified as “Abyssochrysoid gastropod” by Kiel et al. (2013) pending formal description. Together with A. campbellae n. sp. described below it forms a distinctive genus that inhabited ancient hydrocarbon seeps. Abyssomelania cramptoni is much smaller than A. campbellae and has weaker and more numerous spiral ribs on the base. The greatest diameter of the whorl is higher above the abapical suture giving more bulgy appearance than in A. campbellae. The growth lines of A. cramptoni are angulated in the upper part of the lateral flank while in A. campbellae the growth lines are angulated in the middle of the lateral flank.
Etymology
Etymology. For James S. Crampton, who made the field work in New Zealand possible.
Taxon Treatment
- Kaim, Andrzej; Jenkins, Robert G.; Tanabe, Kazushige; Kiel, Steffen; 2014: Mollusks from late Mesozoic seep deposits, chiefly in California, Zootaxa 3861: 414-416. doi
This treatment was originally uploaded by Plazi, compare this treatment on Plazi. Unless this treatment has been substantially changed on Species-ID, Plazi requests to maintain a link back to the original repository.
