A new genus and new species assigned to Macrophthalmidae (Decapoda: Brachyura: Thoracotremata) from the Ryukyu Islands, Japan

Zootaxa. 2018 Dec 11;4531(1):109-116. doi: 10.11646/zootaxa.4531.1.5.

Abstract

Mirograpsus asper is described as a new genus and new species in the subfamily Ilyograpsinae Števčić, 2005, of the family Macrophthalmidae Dana, 1851, on the basis of a single male specimen from Ishigaki Island, Ryukyu Islands, Japan. The new genus most closely resembles the monotypic Apograpsus Komai Wada, 2008 (type species, Ilyograpsus paantu Naruse Kishino, 2006), sharing a similar carapace shape, but is differentiated chiefly by the fusion of the male pleomeres 4-6 and the unarmed meri of the ambulatory legs. The functional fusion of the male pleomeres 4-6 is unique in the Macrophthalmidae.

Keywords: Crustacea, Apograpsus paantu, Ilyograpsinae, Ishigaki Island, Mirograpsus asper.

MeSH terms

  • Animal Distribution*
  • Animal Structures
  • Animals
  • Brachyura*
  • Ecosystem
  • Islands
  • Japan
  • Male
  • Organ Size