Porites macdonaldi Vaughan, 1919.

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Photograph: (Foster, 1986, pl. 22, fig.3) Scale bar is approx. 5.0 mm. Image is of NMB D5845 (NMB locality 16911, Río Mao, ?Gurabo Formation, Dominican Republic. Late Miocene.)

Synonyms: None.

Morphologic Description:

Colony Form: plocoid
Colony Shape: massive or plate-shaped
Corallite Distribution: uneven
Budding Type: extramural
Corallite Diameter: 1.4-1.6 mm
Calical Relief: high, > 0.5 mm in elevation
Septa Per Corallite: 12
Relative Septum Length: short ventral septa
Lobes: paliform
Number of Pali: 2-4
Palar Ring: wide, > 40% (short ventral septa)
Columella Structure: trabecular and discontinuous
Columella Development: strong (columella>pali)
Wall Structure: synapticulothecal
Single or Compound Wall: compound, >2 trabeculae

Lectotype: USNM 72376 (USGS Locality 6016, Empire Quarry, Emperador Limestone of the La Boca Formation of Panama. Middle Miocene.)

Distribution:

Early Miocene: Emperador Limestone, Panama.
Late Early Miocene: Anguilla Formation, Anguilla.
Middle to Late Miocene: Unda core (BDP), Bahamas.
Late Miocene: Gurabo Formation, Dominican Republic.
Early Pliocene: Mao and Gurabo Formations, Dominican Republic.