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)

in Crustaceana
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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.

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)

in Crustaceana

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References

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Figures

  • View in gallery

    Arcotheres borradailei (Nobili, 1906), holotype female, 8.0 × 6.8 mm, CUMZ I.63816, Laccadive Islands. A, dorsal view; B, frontal and ventral view of cephalothorax; C, outer view of right chela.

  • View in gallery

    Arcotheres borradailei (Nobili, 1906), holotype female, 8.0 × 6.8 mm, CUMZ I.63816, Laccadive Islands. A, left P2-P5; B, right P2-P5.

  • View in gallery

    Arcotheres borradailei (Nobili, 1906), holotype female, 8.0 × 6.8 mm, CUMZ I.63816, Laccadive Islands. A, dorsal view; B, C, right MXP3 (setae not drawn); D, propodus and dactylus of left MXP3 (setae not drawn); E, outer view of right chela. A, B, E after Borradaile (1903: fig. 113). Scales = 0.25 mm.

  • View in gallery

    Arcotheres ridewayi (Southwell, 1911), non-ovigerous female, 17.7 × 13.6 mm, ZSI-K/WGRC/IR-INV 8235, Kerala, India, colour in life. A, B, in situ in Pinna; C, ventral view.

  • View in gallery

    Arcotheres ridgewayi (Southwell, 1911), non-ovigerous female, 17.7 × 13.6 mm, ZSI-K/WGRC/IR-INV 8235, Kerala, India. A, dorsal view; B, frontal view of cephalothorax; C, ventral view of cephalothorax showing pleon.

  • View in gallery

    Arcotheres ridgewayi (Southwell, 1911), non-ovigerous female, 17.7 × 13.6 mm, ZSI-K/WGRC/IR-INV 8235, Kerala, India. A-D, left P2-P5, respectively; D′, distal part of dactylus of left P5 showing stiff subdistal spinules (setae not drawn); E-H, right P2-P5, respectively; I, outer view of left chela (setae not drawn); J, left MXP3 (setae not drawn). Scales: A-H = 2.0 mm; D′ = 0.5 mm; J = 1.0 mm.

  • View in gallery

    Arcotheres ridgewayi (Southwell, 1911), dorsal views. A, ovigerous female, 14.7 × 11.2 mm, DABFUK, Kerala, India; B, ovigerous female, 16.6 × 12.3 mm, DABFUK, Kerala, India.

  • View in gallery

    Dorsal view of female carapace. A, Arcotheres borradailei (Nobili, 1906), holotype, 8.0 × 6.8 mm, CUMZ I.63816, Laccadive Islands; B, A. ridgewayi (Southwell, 1911), non-ovigerous female, 17.7 × 13.6 mm, ZSI-K/WGRC/IR-INV 8235, Kerala, India.

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