About: Stethacanthus altonensis   Sponge Permalink

An Entity of Type : owl:Thing, within Data Space : 134.155.108.49:8890 associated with source dataset(s)

Stethacanthus altonensis, like the other stethacanthid sharks, displayed conspicuous sexual dimorphism. Males had large spike-like denticles on top of head and the crest of the highly modified first dorsal fin. The fin and spine of S. altonensis are back-to-back upright triangles with the dorsal fin movably hinged to the rear margin of the spine by a tongue-in-groove joint. (The illustration of the spine is a redrafting of the original drawing of the type specimen). The spine itself was not movable, being mounted deep between the epaxial muscles. Females lacked the fin and the spine, as well as any scales at all.

AttributesValues
rdfs:label
  • Stethacanthus altonensis
rdfs:comment
  • Stethacanthus altonensis, like the other stethacanthid sharks, displayed conspicuous sexual dimorphism. Males had large spike-like denticles on top of head and the crest of the highly modified first dorsal fin. The fin and spine of S. altonensis are back-to-back upright triangles with the dorsal fin movably hinged to the rear margin of the spine by a tongue-in-groove joint. (The illustration of the spine is a redrafting of the original drawing of the type specimen). The spine itself was not movable, being mounted deep between the epaxial muscles. Females lacked the fin and the spine, as well as any scales at all.
dcterms:subject
dbkwik:fossil/prop...iPageUsesTemplate
Name
  • Stethacanthus altonensis
Caption
  • A pair of Stethacanthus altonensis.
fossil range
imagewidth
  • 250(xsd:integer)
Species
  • *S. altonensis *S. productus *S. praecursor *S. mirabilis *S. resistens *S. thomasi
Genus
  • Stethacanthus
Family
Order
abstract
  • Stethacanthus altonensis, like the other stethacanthid sharks, displayed conspicuous sexual dimorphism. Males had large spike-like denticles on top of head and the crest of the highly modified first dorsal fin. The fin and spine of S. altonensis are back-to-back upright triangles with the dorsal fin movably hinged to the rear margin of the spine by a tongue-in-groove joint. (The illustration of the spine is a redrafting of the original drawing of the type specimen). The spine itself was not movable, being mounted deep between the epaxial muscles. Females lacked the fin and the spine, as well as any scales at all. It is likely from the fossil remains we have found in the Bear Gulch Bay that this bay may have been a pupping ground (nursery ground) for large stethacanthids as well as a stopover for feeding during migratory cruising.
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