- Title Pages
- Preface to third edition
- Preface to second edition
- Preface to first edition
- 1 Introduction
- 2 ANIMALIA (METAZOA)
- 3 Prelude: Phylum Choanoflagellata
- 4 Early animal radiation
- 5 Phylum Silicea
- 6 EURADICULATA
- 7 <i>Phylum</i> Calcarea
- 8 PROEPITHELIOZOA
- 9 <i>Phylum</i> Homoscleromorpha
- 10 EUMETAZOA (GASTRAEOZOA)
- 11 <i>Phylum</i> Placozoa
- 12 NEURALIA
- 13 <i>Phylum</i> Cnidaria
- 14 TRIPLOBLASTICA
- 15 Phylum Ctenophora
- 16 BILATERIA
- 17 ACOELOMORPHA
- 18 Phylum Acoela
- 19 Phylum Nemertodermatid
- 20 <i>Phylum</i> Xenoturbellida
- 21 EUBILATERIA
- 22 PROTOSTOMIA
- 23 SPIRALIA (LOPHOTROCHOZOA)
- 24 SCHIZOCOELIA
- 25 Phylum Annelida
- 26 <i>Phylum</i> Sipuncul
- 27 Phylum Mollusca
- 28 <i>Phylum</i> Nemertin
- 29 <i>Phylum</i> Platyhelminthes
- 30 Phylum Gastrotricha
- 31 GNATHIFERA
- 32 <i>Phylum</i> Gnathostomulida
- 33 <i>Phylum</i> Micrognathozoa
- 34 <i>Phylum</i> Rotifera
- 35 POLYZOA (BRYOZOA s.l.)
- 36 Phylum Entoprocta
- 37 <i>Phylum</i> Cycliophora
- 38 Phylum Bryozo (Ectoprocta)
- 39 BRACHIOZOA
- 40 <i>Phylum</i> Phoronida
- 41 <i>Phylum</i> Brachiopoda
- 42 ECDYSOZOA
- 43 PANARTHROPODA
- 44 <i>Phylum</i> Arthropoda
- 45 <i>Phylum</i> Onychophora
- 46 <i>Phylum</i> Tardigrada
- 47 CYCLONEURALIA
- 48 NEMATOIDEA
- 49 <i>Phylum</i> Nematoda
- 50 <i>Phylum</i> Nematomorpha
- 51 SCALIDOPHORA
- 52 <i>Phylum</i> Priapul
- 53 <i>Phylum</i> Kinorhynch
- 54 <i>Phylum</i> Loricifera
- 55 <i>Phylum</i> Chaetognatha
- 56 DEUTEROSTOMIA
- 57 AMBULACRARIA
- 58 <i>Phylum</i> Echinodermata
- 59 HEMICHORDATA
- 60 <i>Phylum</i> Enteropneusta
- 61 <i>Phylum</i> Pterobranchia
- 62 CHORDATA
- 63 <i>Phylum</i> Cephalochordata
- 64 <i>Phylum</i> Urochordata
- 65 <i>Phylum</i> Vertebrata (Craniata)
- 66 Problematica
- Systematic index
- Subject index
- Plates
Phylum Cephalochordata
Phylum Cephalochordata
- Chapter:
- (p.358) 63 Phylum Cephalochordata
- Source:
- Animal Evolution
- Author(s):
Claus Nielsen
- Publisher:
- Oxford University Press
The Cephalochordata, or lancelets, is comprised of only about thirty species representing two families, making it one of the smallest phyla in the animal kingdom. All cephalochordates are marine, living primarily more or less buried in coarse sand. The whole genome of the most common genus, Branchiostoma, or amphioxus, contains a very complete set of genes, including the chordate Hox genes. The notochord is surrounded by a thick basal membrane, and extends anteriorly beyond the mouth and the ‘dorsal’ nerve tube, and posteriorly to the tip of the tail.
Keywords: cephalochordates, Cephalochordata, lancelets, Branchiostoma, amphioxus, Hox genes, notochord
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- Title Pages
- Preface to third edition
- Preface to second edition
- Preface to first edition
- 1 Introduction
- 2 ANIMALIA (METAZOA)
- 3 Prelude: Phylum Choanoflagellata
- 4 Early animal radiation
- 5 Phylum Silicea
- 6 EURADICULATA
- 7 <i>Phylum</i> Calcarea
- 8 PROEPITHELIOZOA
- 9 <i>Phylum</i> Homoscleromorpha
- 10 EUMETAZOA (GASTRAEOZOA)
- 11 <i>Phylum</i> Placozoa
- 12 NEURALIA
- 13 <i>Phylum</i> Cnidaria
- 14 TRIPLOBLASTICA
- 15 Phylum Ctenophora
- 16 BILATERIA
- 17 ACOELOMORPHA
- 18 Phylum Acoela
- 19 Phylum Nemertodermatid
- 20 <i>Phylum</i> Xenoturbellida
- 21 EUBILATERIA
- 22 PROTOSTOMIA
- 23 SPIRALIA (LOPHOTROCHOZOA)
- 24 SCHIZOCOELIA
- 25 Phylum Annelida
- 26 <i>Phylum</i> Sipuncul
- 27 Phylum Mollusca
- 28 <i>Phylum</i> Nemertin
- 29 <i>Phylum</i> Platyhelminthes
- 30 Phylum Gastrotricha
- 31 GNATHIFERA
- 32 <i>Phylum</i> Gnathostomulida
- 33 <i>Phylum</i> Micrognathozoa
- 34 <i>Phylum</i> Rotifera
- 35 POLYZOA (BRYOZOA s.l.)
- 36 Phylum Entoprocta
- 37 <i>Phylum</i> Cycliophora
- 38 Phylum Bryozo (Ectoprocta)
- 39 BRACHIOZOA
- 40 <i>Phylum</i> Phoronida
- 41 <i>Phylum</i> Brachiopoda
- 42 ECDYSOZOA
- 43 PANARTHROPODA
- 44 <i>Phylum</i> Arthropoda
- 45 <i>Phylum</i> Onychophora
- 46 <i>Phylum</i> Tardigrada
- 47 CYCLONEURALIA
- 48 NEMATOIDEA
- 49 <i>Phylum</i> Nematoda
- 50 <i>Phylum</i> Nematomorpha
- 51 SCALIDOPHORA
- 52 <i>Phylum</i> Priapul
- 53 <i>Phylum</i> Kinorhynch
- 54 <i>Phylum</i> Loricifera
- 55 <i>Phylum</i> Chaetognatha
- 56 DEUTEROSTOMIA
- 57 AMBULACRARIA
- 58 <i>Phylum</i> Echinodermata
- 59 HEMICHORDATA
- 60 <i>Phylum</i> Enteropneusta
- 61 <i>Phylum</i> Pterobranchia
- 62 CHORDATA
- 63 <i>Phylum</i> Cephalochordata
- 64 <i>Phylum</i> Urochordata
- 65 <i>Phylum</i> Vertebrata (Craniata)
- 66 Problematica
- Systematic index
- Subject index
- Plates