Lophotrochozoa

Lophotrochozoa (/ləˌfɒtroʊkoʊˈzoʊə/, "crest/wheel animals") is a clade of protostome animals within the Spiralia. The taxon was established as a monophyletic group based on molecular evidence.^[2][3] The clade includes animals like annelids, molluscs, bryozoans, and brachiopods.^[4]

Lophotrochozoa Temporal range: 536–0 Ma[1] PreꞒ Ꞓ O S D C P T J K Pg N
Caribbean reef squid or Sepioteuthis sepioidea is a complex lophotrochozoan
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Subkingdom:	Eumetazoa
Clade:	ParaHoxozoa
Clade:	Bilateria
Clade:	Nephrozoa
Clade:	Protostomia
Clade:	Spiralia
Superphylum:	Lophotrochozoa Halanych et al., 1995
Phyla
Annelida Brachiopoda Bryozoa s.l. Entoprocta †Macrodontophion Mollusca Nemertea †Oikozetetes Phoronida † "Tommotiida" (paraphyletic) † Nectocarididae? Cycliophora?

Groups

See also: List of bilaterial animal orders

Lophotrochozoa was defined in 1995 as the "last common ancestor of the three traditional lophophorate taxa (brachiopods, bryozoans, and phoronid worms), the mollusks and the annelids, and all of the descendants of that common ancestor".^[5] It is a cladistic definition (a node-based name), so the affiliation to Lophotrochozoa of spiralian groups not mentioned directly in the definition depends on the topology of the spiralian tree of life, and in some phylogenetic hypotheses, Lophotrochozoa may even be synonymous to Spiralia. Nemertea and Orthonectida (if not directly considered as part of Annelida) are probably lophotrochozoan phyla; Dicyemida, Gastrotricha, and Platyhelminthes may be lophotrochozoans or placed in the Rouphozoa clade outside Lophotrochozoa; Chaetognatha, Gnathostomulida, Micrognathozoa, and Syndermata are probably gnathiferans and so placed as a basal spiralian clade outside Lophotrochozoa; Cycliophora could be a gnathiferan or a lophotrochozoan phylum. One of the candidate hypotheses is presented below.

The Lophotrochozoa has basal Cycliophora and Mollusca groups, and more derived Lophophorate, Nemertea and Annelida groups.^[6][7]

With the introduction of Platytrochozoa and Rouphozoa, one candidate phylogeny is pictured below – though other studies recover a range of alternative possibilities:^{[8][9][10][11][12][13][14][15]}

In the most recent research, the three phyla Cycliophora, Entoprocta and Bryozoa makes up a single clade and are the first to branch off from the other lophotrochozoans. The second split is the molluscs, and the third consists of two sister phyla, annelids and nemerteans. Lastly remains the clade that consist of the phoronids and the brachiopods.^[16][17]

Protostomes	Ecdysozoa Spiralia Gnathifera Platytrochozoa Rouphozoa Gastrotricha Platyhelminthes Mesozoa Lophotrochozoa Cycliophora Annelida Echiura Clitellata Siboglinidae Sipuncula Mollusca Kryptotrochozoa Lophophorata Brachiozoa Brachiopoda Phoronida Bryozoa s.l. Entoprocta Ectoprocta Nemertea

Another study recovers Lophotrochozoa as equivalent to Platytrochozoa, forming a sister group with Gnathifera at the base of Spiralia.^[18]

Protostomia	Ecdysozoa  Spiralia (s.l.) / Gnathifera  Lophotrochozoa /   Tetraneuralia    Mollusca Entoprocta     Gastrotricha  Lophophorata      Ectoprocta Phoronida Brachiopoda Annelida  Parenchymia    Platyhelminthes Nemertea  Platytrochozoa /  Spiralia (s.s.)  Gnathospiralia

A number of fossil taxa can be identified as early Lophotrochozoans, even if their precise affinity remains contested. However, relevant Cambrian fossils are debated.

Characteristics

The clade Lophotrochozoa is named after the two distinct characteristics of its members; the lophophore, a feeding structure consisting of a ciliated crown of tentacles surrounding a mouth, and the developmental stage of the trochophore larva. Lophophorata such as Brachiozoa and Bryozoa have lophophores, while members of Trochozoa such as molluscs and annelids have trochophore larvae, although some may have none.^[19][20]