Holonema

Holonema
Temporal range: Givetian to Frasnian,
H. westolli
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: †Placodermi
Order: †Arthrodira
Suborder: †Brachythoraci
Family: †Holonematidae
Genus: †Holonema
Newberry, 1889
Type species
Pterichthys rugosum
Claypole, 1883
Species
  • H. rugosum (Claypole, 1883)
  • H. arcticum Marik-Kurik, 1975
  • H. bruehni Markus, 1998
  • H. harmae Mark, 1953
  • H. farrowi Stevens, 1964
  • H. obrutshevi Mark, 1953
  • H. ornatum Traquair, 1903
  • H. haiti Denison, 1968
  • H. radiatum Obruchev, 1932
  • H. westolli Miles, 1971
Synonyms
  • Pterichthys rugosus Claypole, 1883
  •  ?Glyptaspis eastmanni Swartz, 1913
  • Holonema horridum Cope, 1892
  • Holonema rohoni nomen nudum Obruchev 1931

Holonema is an extinct genus of relatively large, barrel-shaped arthrodire placoderms that were found in oceans throughout the world from the Mid to Late Devonian, when the last species perished in the Frasnian-Fammian extinction event. Most species of the genus are known from fragments of their armor, but the Gogo Reef species, H. westolli, is known from whole, articulated specimens.

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