The Echinoid Directory

Linthia Desor, 1853, p. 278

[=Lutetiaster Lambert, 1920, p. 27; type species Spatangus subglobosus Lamarck, 1816; =Victoriaster Lambert, 1920, p. 27, type species Pericosmus gigas McCoy, 1882; =Escheria Desor, 1853, p. 143 (non Heer, 1847).
]

Diagnostic Features
  • Test ovate to cordiform with shallow to strong anterior sulcus; posterior face truncate.
  • Apical disc ethmolytic with 4 gonopores.
  • Anterior ambulacrum sunken from apex to peristome; pore-pairs uniserially arranged and differentiated (presumably associated with funnel-building tube-feet).
  • Paired ambulacra petaloid; petals sunken, parallel-sided, with little perradial space; cruciform, the anterior petals being similar in length or slightly longer than the posterior petals.
  • Peristome kidney-shaped and facing obliquely forwards into frontal groove. Labrum projecting to cover peristome in oral view.
  • Plastron plating with short labral plate and large, symmetical sternal plates. Labral plate short and wide in some species, slightly longer and extending to second amb plate in others. Sternal plates extending to ambulacral plate 6, 7 or 8.
  • Periproct small, on posterior truncate face.
  • Peripetalous and lateroanal fascioles present; peripetalous fasciole deeply indented between petals.
Distribution
Upper Cretaceous to Pliocene; Americas, Europe, Middle and Far East.
Name gender feminine
Type
Linthia insignis Merian in Desor, 1853, p. 278, by original designation
Species Included
  • Many species, including...
  • L. insignis (Merian, 1853); Eocene, France.
  • L. houzeaui Cotteau, 1879; Danian, Europe.
  • L. somaliensis Currie, 1927); Lower Eocene, Somalia.
  • L. sudanensis Bather, 1904; Palaeocene-early Eocene, Niger and Mali.
  • L. harmatuki Kier, 1980; Middle Eocene, SE USA.
  • L. wilmingtonensis Clark, 1915; Middle Eocene, SE USA.
  • L. hanoverensis Kellum, 1926; Middle Eocene, SE USA.
  • L. nipponica Yoshiwara, 1899; Pliocene, Japan.
  • L. tokunagoi Lambert, 1925; Pliocene, Japan.
  • L. praenipponica Nagao, 1928; Oligocene, Japan.
  • L. yessoensis Minato, 1950; Oligocene, Japan.
  • L. boreasteria Nisiyama, 1968; Oligocene, Japan.
  • L. pulchra MacNamara, 1985; late Middle to early Late Eocene, southern Australia.
  • L. cavernosa de Loriol, 1880; Lower to Middle Eocene (Ypresian to Lower Lutetian), North Africa, including Somalia and the Arabian Peninsula.
  • L. delanouei de Loriol, 1880; Palaeocene to Upper Eocene, North Africa and Arabian Peninsula.
  • L. trechmanni Hawkins, 1924; Eocene, Jamaica.
  • L. navillei de Loriol, 1880; Lower to Middle Eocene (Ypresian to Lower Lutetian), Egypt and Qatar.
  • L. gigas (McCoy, 1882); Middle Miocene, Australia.
Classification and/or Status

Spatangoida, Paleopneustina, Schizasteridae.

?Paraphyletic by exclusion of Protenaster.

Remarks
Close to Protenaster, but distinguished by its deeper anterior groove and more cruciform petals. In Protenaster the apical disc is significantly more anterior than in Linthia. Victoriaster is closer in form to the type species of Linthia than many of the species currently assigned to that genus.

Desor, E. 1853. Notice sur les echinides du terrain nummulitique des Alpes. Actes de la Societe helvetique Sciences naturelles 38, p. 278