Abstract
Dimorphostylis elegans Gamô, 1960 and two related new species, D. bathyelegans n. sp. and D. brevicarpus n. sp. are described. Dimorphostylis elegans were collected from the Pacific coasts of Honshu and Shikoku Islands, and the East China Sea, Japan, 74–443 m. As a result, D. latifrons Harada, 1960 from the Izu Peninsula, Japan is declared a junior synonym of D. elegans. Morphological variation of the carapace is discussed. Dimorphostylis bathyelegans, from southern coast of the Honshu Island and the East China Sea, is very similar to D. elegans, but is distinguished from the latter by the long telson and the third peduncle article of antenna 1 with more short setae. Depth of the habitat ranges from 495–918 m, which is the deepest known species in the genus. Dimorphostylis brevicarpus was collected from Kyushu and Nansei Islands, East China Sea, on sandy bottoms, 165–236 m deep. This species also resembles D. elegans, but is distinguished from the latter by (1) short carpus of pereopods 3–5, (2) anterior end of dorsolateral carina with 2 or 3 teeth, and (3) maxilliped 1 with a group of sharp spines on the ventral surface of basis, and (4) carapace covered with numerous small pits, with a tiny seta in each.References
Bacescu, M. (1992) Cumacea II (Fam. Nannastacidae, Diastylidae, Pseudocumatidae, Gynodiastylidae et Ceratocumatidae). Crustaceorum Catalogus, 8, 178–468.
Bacescu, M., Petrescu, I. (1999) Ordre des Cumacés (Cumacea Kroyer, 1846). Mémoires de l'Institut Océanographique, Monaco 19, 391–428.
Foxon, G.E.H. (1932) Report on Stomatopod larvae, Cumacea and Cladocera. Scientific Reports (Great Barrier Reef Expedition) ( 1928–29), 4, 387–395.
Gamô, S. (1960) Five new species of cumacean Crustacea, genus Dimorphostylis (Diastylidae) from Sagami Bay. Zoological Magazine, 69, 101–111.
Gamô, S. (1962) On the cumacean Crustacea from Tanabe Bay, Kii Peninsula. Publication of the Seto Marine Bioogical Laboratory, 10,153–210.
Gamô, S. (1968) Studies on the Cumacea (Crustacea, Malacostraca) of Japan. III. Publication of the Seto Marine Biological Laboratory, 16, 147–192.
Hale, H.M. (1936) Three new species of Cumacea from South Australia. Record of the South Australian Museum, 5, 395–403.
Hale, H.M. (1945) Australian Cumacea No. 11. The family Diasytylidae (Part 1). Transactions of the Royal Society of South Australia, 69, 8–95
Harada, I. (1960) Cumacean fauna of Japan. II. Family Diastylidae (Part 1). Genus Dimorphostylis. Science Reports of the Tokyo Kyoiku Daigaku. Section B, 9, 199–225.
Kurian, C.V. (1954) Notes on Cumacea (Sympoda) in the zoological survey of India. Record of the Indian Museum, 52, 275–311.
Kurian, C.V. (1965) Cumacea collected by the R. V. Conch during her cruises off the Kerala coast. India, in 1958 and 1959. Crustaceana, 8, 181–189.
Lee, K-S., Lee, C-M. (2002) A new species of the genus Dimorphostylis (Cumacea, Diastylidae) from Korea. Korean Journal of Biological Sciences, 6, 23–33.
Mühlenhardt-Siegel, U. (1996) Cumacea from the Red Sea and the Maldives (Indian Ocean) in the collection of the Zoological Museum, Hamburg, with the description of the seven new species and a new genus. Beaufortia, 46, 105–134.
Petrescu, I. (2002) Cumacea (Crustacea: Peracarida) collected from Tanzanian coast by the expedition of "Grigore Antipa" National Museum of Natural History (Bucharest). Part V. families Diastylidae and Gynodiastylidae. Travaux du Museum d'Histoire Naturelle "Grigore Antipa", 64, 105–140.
Zimmer, C. (1903) Die Cumaceen des Museum fur Naturkunde in Berlin. Zoologische Jahrbücher, Abtheilung für Systematik, Geographie und Biologie der Thiere, 18, 665–694.
Zimmer, C. (1921) Mitteilungen über Cumacean des Berliner Zoologischen Museums. Mitteilungen aus dem Zoologischen Museum in Berlin, 10, 117–149.