The coral genus Caulastraea Dana, 1846 (Scleractinia, Merulinidae) as a new host for gall crabs (Decapoda, Cryptochiridae), with the description of Lithoscaptus tuerkayi sp. nov.

in Crustaceana
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A new gall crab species is described from the stony coral genus Caulastraea, a new host coral genus for Cryptochiridae crabs. Specimens were collected during fieldwork off Kudat (Malaysian Borneo) and Okinawa (Japan). Further material was retrieved from the collections of the Institute of Oceanography in Nha Trang (Vietnam). The new species, here named Lithoscaptus tuerkayi sp. nov., is the tenth assigned to the genus in which it is tentatively placed. It can be separated from its congeners by the strongly demarcated, inverted V-shaped protuberance flanking the mesogastric region, with denuded spots on the anterolateral sides of this inverted V-shape, as well as the denuded area just below the frontal margin. Based on morphology and COI sequence data, the closest species to L. tuerkayi sp. nov. is determined to be Lithoscaptus helleri (Fize & Serène, 1957).

The coral genus Caulastraea Dana, 1846 (Scleractinia, Merulinidae) as a new host for gall crabs (Decapoda, Cryptochiridae), with the description of Lithoscaptus tuerkayi sp. nov.

in Crustaceana



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  • View in gallery

    Ovigerous female holotype (3.3 mm × 2.9 mm) of Lithoscaptus tuerkayi sp. nov. (RMNH.Crus.D.54336): A, habitus, dorsal view; B, anterior cephalothorax, ventral view; C, MXP3. Scale bars = 1 mm.

  • View in gallery

    Ovigerous female holotype of Lithoscaptus tuerkayi sp. nov. (RMNH.Crus.D. 54336): A, left P1 (cheliped); B, left P2; C, left P3; D, left P4; E, left P5. Scale bar = 1 mm.

  • View in gallery

    A-B, Colour in life of Lithoscaptus tuerkayi sp. nov. (OUMNH.ZC.2016-01-030); C-D, Dwellings (circled) in Caulastraea furcata at SE Banggi Dangers, Sabah, Malaysia, at 10 m depth.

  • View in gallery

    Specimen of Lithoscaptus tuerkayi sp. nov. (labelled as Troglocarcinus gordoni) in the Nha Trang collections. A-B, dorsal and ventral view of ovigerous female (E.39515); C-D, dorsal and ventral view of male (E.39492). Photographs not to scale.

  • View in gallery

    Phylogeny reconstruction of the Cryptochiridae, based on COI, indicating the position of Lithoscaptus tuerkayi sp. nov. (in bold). Topology and support values derived from maximum likelihood analysis in Phyml 3.1. The numbers preceding the species names refer to collection numbers of the specimens in Naturalis Biodiversity Center (collection coded as RMNH.Crus.D.).

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