Family EURYPLACIDAE Stimpson, 1871

Eucrate affinis from Miers 1884: pl. 24 fig. C]

Museums

Regional Maps

• Euryplacinae Stimpson, W. 1871. Preliminary report on the Crustacea dredged in the Gulf Stream in the Straits of Florida, by L.F. de Pourtales, Assist. U.S. Coast Survey. Bulletin of the Museum of Comparative Zoology, Harvard 2: 109-160 [150].

  Type genus:

   Euryplax Stimpson, 1859.

Diagnosis

Carapace subquadrilateral, quadrilateral, or trapezoidal. Frontal margin typically with more or less well-developed latero-inferior lobes. Infraorbital margin with typically prominent inner tooth or lobe; also, internal to this, a more or less strongly developed occlusive, intercalated orbital tooth abutting basal antennal segment; orbit may be open, or closed either by occlusive orbital tooth meeting front, or by projection of basal antennal segment. Sternal plastron greatly widened; sternite 8 only just visible beside abdomen in front of lateral margin of second (and sometimes also first) abdominal segment, or more obvious, with the suture with sternite 7 clearly visible. Position of male genital opening variable: clearly sternal with penis free but lying in more or less well-developed groove; becoming sternal with penis sheathed and/or protected proximally by a covered groove; or sternal, with penis lying in closed canal. Male abdomen with seven segments, typically appearing triangular but shape variable. Male first gonopod long and thin, very narrow apically; armed with small, more or less prominent tubercles over its length; second gonopod short.

History of changes