Abstract
The laomediid mud shrimp genus Axianassa Schmitt, 1924 is currently represented by 12 species worldwide. In this study, a new species of the genus, A. microlepis, is described and illustrated on the basis of two female specimens obtained from Awaji Island, eastern part of the Seto Inland Sea, Japan, at depth of 8 m. The type specimens were collected by means of an airlift suction sampler, which enables collection of infauna in subtidal soft sediments. The new species, representing the fourth species of the genus known from the western Pacific, is readily distinguished from other congeners by the unique structure of the antennal scaphocerite (short, non-dagger shaped, terminally rounded or having spine and blade), faintly crenulate rostral margins and the presence of a small lateral notch on the uropodal endopod. An amended identification key to the species of Axianassa and Heteroaxianassa Sakai, 2016 is provided.
References
Anker, A. (2010) The mud-shrimp genus Axianassa Schmitt, 1924 (Crustacea, Decapoda, Axianassidae) in the Indo-West Pacific, with description of a new species from French Polynesia. Zootaxa, 2557 (1), 49–59.
https://doi.org/10.11646/zootaxa.2557.1.5
Anker, A. (2011) Four new infaunal decapod crustaceans (Caridea: Alpheidae and Gebiidea: Axianassidae) from Lizard Island, Australia, one of them also occurring in Moorea, French Polynesia. Zootaxa, 2734, 1–22.
https://doi.org/10.11646/zootaxa.2734.1.1
Anker, A. (2020) Strianassa lerayi gen. et sp. nov., a new laomediid mud-shrimp from the eastern Pacific, with new records of Axianassa ngochoae Anker, 2010 and Heteroaxianassa heardi (Anker, 2011) in the western Pacific (Malacostraca: Decapoda: Gebiidea). Zootaxa, 4820 (3), 523–539.
https://doi.org/10.11646/zootaxa.4820.3.6
Anker, A. & Lazarus, J.F. (2015) Description of two new associated infaunal decapod crustaceans (Axianassidae and Alpheidae) from the tropical eastern Pacific. Papéis Avulsos de Zoologia, 55, 115–129.
https://doi.org/10.1590/0031-1049.2015.55.08
Anker, A. & Pachelle, P.P.G. (2016) Mud-shrimps of the genus Axianassa Schmitt, 1924 from Panama, with description of two new species (Decapoda: Gebiidea: Laomediidae). Zootaxa, 4111 (2), 101–125.
https://doi.org/10.11646/zootaxa.4111.2.1
Boone, L. (1931) A collection of anomuran and macruran Crustacea from the Bay of Panama and the fresh waters of the Canal Zone. Bulletin of the American Museum of Natural History, 63, 137–189. [http://hdl.handle.net/2246/853]
Borradaile, L.A. (1903) On the classification of the Thalassinidea. Annals and Magazine of Natural History, Series 7, 12, 534–551 + 638 (addendum).
https://doi.org/10.1080/00222930308678891
Dworschak, P.C. (2015) Methods collecting Axiidea and Gebiidea (Decapoda): a review. Annalen des Naturhistorischen Museums in Wien, Serie B, 117, 5–21.
https://www.jstor.org/stable/43922304
Dworschak, P.C. (2019) Axiidea (Micheleidae) and Gebiidea (Laomediidae and Upogebiidae) of Panglao, the Philippines. Annalen des Naturhistorischen Museums in Wien, Serie B, 121, 19–32.
Dworschak, P.C. & Coelho, V.R. (1999) On two alpheids from Araçá (São Paulo, Brazil) with a description of a new species of Leptalpheus (Decapoda: Caridea: Alpheidae). Annalen des Naturhistorischen Museums in Wien, Serie B, 101B, 475–488.
https://www.jstor.org/stable/41767162
Kensley, B. & Heard, R. (1990) The genus Axianassa (Crustacea: Decapoda: Thalassinidea) in the Americas. Proceedings of the Biological Society of Washington, 103, 558–572. [http://biodiversitylibrary.org/page/34592019]
Komai, T. (2014) A new species of the mud shrimp genus Axianassa (Crustacea: Decapoda: Gebiidea: Axianassidae) from Japan. Species Diversity, 19, 141–149.
https://doi.org/10.12782/sd.19.2.141
Komai, T. & Fujita, Y. (2019) A new species of the mud shrimp genus Axianassa Schmitt, 1924 (Decapoda: Gebiidea: Laomediidae) from the Ryukyu Islands, southern Japan. Zootaxa, 4658 (3), 452–460.
https://doi.org/10.11646/zootaxa.4658.3.2
Komai, T., Tamego, T. & Hanano, K. (2020) A new species of the alpheid shrimp genus Automate de Man, 1888 (Decapoda: Caridea) from Japan. Zootaxa, 4820 (2), 305–322.
https://doi.org/10.11646/zootaxa.4820.2.5
Liu, W. & Liu, R. (2010) First record of the gebiidean genus Axianassa Schmitt, 1924 (Crustacea: Decapoda: Gebiidea: Axianassidae) in the West Pacific, with description of a new species from the South China Sea. Raffles Bulletin of Zoology, 58, 193–197.
Rathbun, M.J. (1901) Investigations of the Aquatic Resources and Fisheries of Porto Rico by the United States Fish Commission Steamer Fish Hawk in 1899. The Brachyura and Macrura of Porto Rico. Bulletin of the United States Fish Commission (for 1900), 20 (2), 1–127, pls. 1–2. [preprint dated 1901, published in journal in 1902]
Rodrigues, S.A. & Shimizu, R.M. (1992) Description of a new Axianassa (Crustacea: Decapoda: Thalassinidea) from Brazil, and its first larval stage. Proceedings of the Biological Society of Washington, 105, 317–323. [http://biodiversitylibrary.org/page/35607490]
Sakai, K. (2016) An aberrant specimen of the genus Laomedia De Haan, 1841, with an additional description of Laomedia astacina De Haan, 1841 and a new genus, Heteroaxianassa (Decapoda, Thalassinidea1, Laomediidae). Crustaceana, 89 (5), 595–602.
https://doi.org/10.1163/15685403-00003535
Schmitt, W.L. (1924) Bidragen tot de kenntis der fauna van Curaçao. Resultaten eener reis van Dr. C. J. van der Horst in 1920. The macruran, anomuran and stomatopod Crustacea. Bijdragen tot de Dierkunde, 23, 61–81. [http://www.repository.naturalis.nl/document/547708]