Neritimorpha

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Neritimorpha
Temporal range: Early Ordovician – Recent
Examples of Neritimorpha
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Neritimorpha
Clades

See text

Synonyms

Neritopsina Cox & Knight, 1960

Neritimorpha is a clade of

slugs.[1]
This clade used to be known as the superorder Neritopsina.

Etymology

The clade’s name, Neritimorpha, is from the Ancient Greek νηρίτης (nērī́tēs 'Nerite') and μορφή (morphḗ 'form').[2]

Description

Shells of the freshwater snail Theodoxus danubialis
Shells of the land snail species Helicina rostrata
Titiscania, a shellless neritimorph

Despite their relatively low diversity, with only around 2,000 species, neritomorphs have achieved a remarkable diversity of forms, resembling a smaller-scale version of the diversity achieved by Gastropoda as a whole.

extant Helicinidae and Hydrocenidae.[4] Neritimorphs also include the shellless, slug-like Titiscania.[3]

In all modern neritomorphs except neritopsids, the inner walls of the protoconch are resorbed.[5]

Unlike most other gastropods, neritomorphs typically have calcified opercula. There is no operculum in the shellless Titiscania, and the Phenacolepadidae have a vestigial, non-calcified operculum that shows no postlarval growth.[6]

Evolutionary history

Neritimorpha has an extremely rich geologic history, going back to early Ordovician.[5] This clade has been considered to be a leftover of early gastropod diversification.

Neritimorpha is the sister taxon of the Apogastropoda.[7][8] The clade uniting neritimorphs and apogastropods has been called either Adenogonogastropoda[9] or Angiogastropoda.[7]

All modern members of Neritimorpha are classified in the order

Cycloneritimorpha.[5] Neritopsoidea was the first of the four modern neritomorph superfamilies to diverge from the others.[4]

1997 taxonomy

According to the

Palaeotrochoidea
is contained within Neritopsina but its order placement is undetermined.

2005 taxonomy

The

Cycloneritimorpha, as well as Paleozoic
Neritimorpha of uncertain position.

Clades (and uncertain position taxa) in Neritimorpha include:

Four extant superfamilies are recognised:

Hydrocenoidea, Neritoidea and Neritopsoidea
.

In human society

Nerite snails are popular in the aquarium trade.[11]

References

  1. PMID 27456746
    .
  2. ^ Bailly, Dictionnaire Grec Francais. 1935.
  3. ^
    ISSN 1055-7903
    .
  4. ^
    PMC 1691182
    .
  5. ^ a b c Bandel, Klaus; Frýa, Jiři (1999-09-30). "Notes on the evolution and higher classification of the subclass Neritimorpha (Gastropoda) with the description of some new taxa" (PDF). Geologica et Palaeontologica. 33: 219–235.
  6. ISSN 0362-2525
    .
  7. ^
    PMC 6458328
    .
  8. ISSN 1063-5157
    .
  9. ISSN 0066-7870
    .
  10. ISBN 3-925919-72-4. ISSN 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278
  11. ^ "Nerite Snails: Algae Eating, Care, Lifespan, Eggs - Video". Aquarium Care Basics. Retrieved 2022-07-14.
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