The Echinoid Directory

Echinosigra Mortensen, 1907, p. 82

Diagnostic Features
  • Test bottle-shaped with strongly elongate anterior and posterior rostra; thin-shelled.
  • Apical disc with two gonopores only opening in single anterior genital plate (?=G2). Compact. Posterior ocular plates far removed from remaining plates of apical disc.
  • Ambulacra all similar with minute pores only.
  • Anterior ambulacrum deeply sunken from ambitus adorally, forming a funnel-like opening leading to the peristome.
  • Peristome subcircular and facing anteriorly into frontal groove.
  • Plastron plating orthosternous; sternal plate enlarged and followed by a pair of symmetrical episternal plates.
  • Plastron plating disjunct.
  • Ambulacra I and V continuous on oral surface; not separated by intercalated plates of interambulacra 1 and 4.
  • Scattered small tubercles distributed over the aboral surface.
  • Periproct supramarginal, overarched by interambulacral plates.
  • Subanal fasciole present. 
There are two subgenera: E. (Echinosigra) and E. (Echinogutta)

Recent; Atlantic, Antarctic, Indian Ocean.
Name gender feminine
Pourtalesia phiale Thomson, 1873, p. 90, by original designation.
Species Included
  • E. (E.) phiale phiale (Thomson, 1873); Recent, NE Atlantic, Antarctic.
  • E. (E.) phiale partita Mironov, 1997; Recent.
  • E. (E.) mortenseni Mironov, 1974; Recent.
  • E. (E.) porrecta Mironov, 1974; Recent.
  • E. (E.) vitayazi Mironov, 1997; Recent.
  • E. (Eg.) amphora amphora Mironov, 1974; Recent.
  • E. (Eg.) amphora indica Mironov, 1974; Recent.
  • E. (Eg.) antarctica Mironov, 1974; Recent.
  • E. (Eg.) fabrefacta Mironov, 1974; Recent.
  • E. (Eg.) valvaedentata Mironov, 1974; Recent.
See also Echinosigra (Echinogutta) and Echinosigra (Echinosigra)
Classification and/or Status

Holasteroida, Meridosternata, Urechinina, Pourtalesiidae.



Differs from Pourtalesia by having a much extended anterior rostrum.

Mironov, A. N. 1997. [Holasteroid sea urchins. 4. Echinosigra]. Zoologicheskii Zhurnal 76, 173-186.

Mortensen, T. 1907. Danish Ingolf-expedition 4 (1-2) Echinoidea.

Mortensen, T.1950. A Monograph of the Echinoidea. V.1. Spatangoida 1. C. A. Reitzel, Copenhagen.