Cephalaspidomorphi

Cephalaspidomorphs
Temporal range: 438–359 Ma[1][2] Cephalaspidomorphs may have survived to the present day if lampreys and/or gnathostomes are their descendants
Life restoration of Cephalaspis lyelli.
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Subphylum:
Vertebrata
Infraphylum:
Agnatha
(unranked):
†Cephalaspidomorphi
Type species
†Cephalaspis lyelli
Agassiz, 1835
Subgroups

†Osteostraci
†Galeaspida
†Pituriaspida
Gnathostomata?

Cephalaspidomorphs are a group of jawless fishes named for Cephalaspis of the osteostracans. Most biologists regard this taxon as extinct, but the name is sometimes used in the classification of lampreys, because lampreys were once thought to be related to cephalaspids. If lampreys are included, they would extend the known range of the group from the Silurian and Devonian periods to the present day. They are the closest relatives of jawed fishes, who may have emerged from within them; if this is true, they would survive if the jawed fish are included.

Biology and morphology

Reconstruction of Cephalaspis lyellii

Cephalaspidomorphs were, like most contemporary fishes, very well armored. The head shield was particularly well developed, protecting the head, gills and the anterior section of the viscera. The body was in most forms well armored as well. The head shield had a series of grooves over the whole surface, forming an extensive lateral line organ. The eyes were rather small and placed on the top of the head. There was no jaw proper. The mouth opening was surrounded by small plates, making the lips flexible, but without any ability to bite.[3]

No internal skeleton is known, outside of the head shield. If they had a vertebral column at all, it would have been cartilage rather than bone. Likely, the axial skeleton consisted of an unsegmented notochord. A fleshy appendage emerged laterally on each side, behind the head shield, functioning as pectoral fins. The tail had a single, wrap-around tail-fin. Modern fishes with such a tail are rarely quick swimmers, and the Cephalaspidomorphs were not likely very active animals. They probably spent much of their time semi-submerged in the mud. They also lacked a swim bladder, and would not have been able to keep afloat without actively swimming. The head shield provided some lift though and would have made the Cephalaspidomorphs better swimmers than most of their contemporaries.[3] The whole group were likely algae- or filter-feeders, combing the bottom for small animals, much like the modern armored bottom feeders, such as Loricariidae or Hoplosternum catfish.[4]

Classification

In the 1920s, the biologists Johan Kiær and Erik Stensiö first recognized the Cephalaspidomorphi as including the osteostracans, anaspids, and lampreys, because all three groups share a single dorsal "nostril", now known as a nasohypophysial opening.[5]

Since then, opinions on the relations among jawless vertebrates have varied. Most workers have come to regard Agnatha as paraphyletic, having given rise to the jawed fishes. Because of shared features such as paired fins, the origins of the jawed vertebrates may lie close to Cephalaspidomorphi. Many biologists no longer use the name Cephalaspidomorphi because relations among Osteostraci and Anaspida are unclear, and the affinities of the lampreys are also contested. Others have restricted the cephalaspidomorphs to include only groups more clearly related to the Osteostraci, such as Galeaspida and Pituriaspida, that were largely unknown in the 1920s.[6]

Lampreys

Some reference works and databases have regarded Cephalaspidomorphi as a Linnean class whose sole living representatives are the lampreys.[7] Evidence now suggests that lampreys acquired the characters they share with cephalaspids by convergent evolution.[8] [9] As such, many newer works about fishes classify lampreys in a separate group called Petromyzontida or Hyperoartia.[10]

References

  1. ^ Gai Z, Lu L, Zhao W, Zhu M (2018) New polybranchiaspiform fishes (Agnatha: Galeaspida) from the Middle Palaeozoic of China and their ecomorphological implications. PLoS ONE 13(9): e0202217. doi:10.1371/journal.pone.0202217
  2. ^ Sansom, Robert S.; Randle, Emma; Donoghue, Philip C. J. (February 7, 2015). "Discriminating signal from noise in the fossil record of early vertebrates reveals cryptic evolutionary history". Proceedings of the Royal Society B. 282 (1800): 20142245. doi:10.1098/rspb.2014.2245. PMC 4298210. PMID 25520359.
  3. ^ a b Morales, Edwin H. Colbert, Michael (1991). Evolution of the vertebrates : a history of the backboned animals through time (4th ed.). New York: Wiley-Liss. ISBN 978-0-471-85074-8.{{cite book}}: CS1 maint: multiple names: authors list (link)
  4. ^ Lucas, F.A. (1922). Animals of the past : an account of some of the creatures of the ancient world. New York: American Museum of Natural History.
  5. ^ Stensiö, E.A. (1927): The Devonian and Downtonian vertebrates of Spitsbergen. 1. Family Cephalaspidae. Skrifter om Svalbard og Ishavet, no. 12, pp. 1–391.
  6. ^ White, Toby. "Thelodonti: Cephalaspidomorphi". Palaeos. Archived from the original on 2009-03-06. Retrieved 2009-10-27.
  7. ^ Nelson, Joseph S. (1994). Fishes of the World (Third ed.). John Wiley and Sons. ISBN 0-471-54713-1.
  8. ^ Forey, Peter & Janvier, Philippe (2012). "Agnathans and the origin of jawed vertebrates". In Gee, Henry (ed.). Shaking the tree: readings from Nature in the history of life. USA: University of Chicago Press; Nature/Macmillan Magazines. pp. 251–266. ISBN 978-0-226-28497-2.
  9. ^ Janvier, Philippe (2008). "Early Jawless Vertebrates and Cyclostome Origins". Zoological Science. 25 (10): 1045–1056. doi:10.2108/zsj.25.1045. PMID 19267641.
  10. ^ Nelson, J. S. (2006). Fishes of the World (4th ed.). New York: John Wiley and Sons, Inc. pp. 601 pp. ISBN 0-471-25031-7.
  • Janvier, Philippe. Early Vertebrates. Oxford, New York: Oxford University Press, 1998. ISBN 0-19-854047-7