Arcotheres borradailei (Nobili, 1906) and Pinnotheres ridgewayi Southwell, 1911: a reassessment of characters and generic assignment of species to Arcotheres Manning, 1993 (Decapoda, Brachyura, Pinnotheridae)

Abstract

The identity of the pea crab, Arcotheres borradailei (Nobili, 1906) is clarified. The holotype female is re-diagnosed, figured and its recent generic assignment to Arcotheres Manning, 1993, is discussed. A second poorly known species from India and Sri Lanka that resembles A. borradailei, Pinnotheres ridgewayi Southwell, 1911, is redescribed and assigned to Arcotheres. In addition, Pinnotheres sinensis atrinae Sakai, 1939, and Pinnotheres cyclinus Shen, 1932, from East Asia are re-examined and also referred to Arcotheres.