Periclimenes speciosus, a New Species of Anthozoan Associated Shrimp (Crustacea: Decapoda: Palaemonidae) from Southern Japan

A new hemiarthrine bopyrid, <i>Izuohshimaphryxus hoshinoi</i> (Crustacea: Isopoda) from Izu-Ohshima Island, Sagami Sea, Pacific coast of central Japan

“…The shrimp with the missing bopyrid (KMNH IvR 500,808) is a male (CL 3.80 mm); the body colour of the host shrimp (CL 4.93 mm) of the holotype of I. hoshinoi was typical of that of mature males (cf. Okuno, 2004), but this specimen did not have an appendix masculina on the endopod of the second pleopod.…”

“…3. Ancylomenes speciosus (Okuno, 2004), male (CL 4.93 mm), host shrimp of Izuohshimaphryxus hoshinoi sp. nov., associated with the sea anemone Antheopsis maculata (Klunzinger, 1877) sensu Uchida & Soyama (2001), northeastern coast of Izu-Ohshima Island, Sagami Sea, Japan, 20 m depth, habitus in situ, photo by O. Hoshino.…”

“…Most of these Japanese hemiarthrine bopyrids, aside from two unidentified species, attach to the ventral surface of caridean shrimps belonging to five families (Palaemonidae, Alpheidae, Hippolytidae, Rhynchocinetidae, and Pandalidae) (Saito, 2002;Saito & Shimomura, 2015). Recently, two specimens of an anthozoan-associated shrimp, Ancylomenes speciosus (Okuno, 2004), each bearing one hemiarthrine bopyrid on the dorsal surface of the pleon, were collected by SCUBA diving off Izu-Ohshima Island, Sagami Sea, Pacific coast of central Japan. One of the bopyrids was lost when it became detached from its host.…”

“…Izuohshimaphryxus hoshinoi, a new genus and species of hemiarthrine bopyrid, is described on the basis of a single female specimen from the coastal waters of Izu-Ohshima Island, Sagami Sea, Pacific coast of central Japan. This bopyrid infests an anthozoan-associated shrimp, Ancylomenes speciosus (Okuno, 2004), attaching to the dorsal surface of the pleon. This new genus is most similar to Filophryxus Bruce, 1972 but is distinguished by a) the presence of pereopods on the concave side, b) number of lateral plates of the pleon, and c) absence of a pleotelson.…”

Further Indo‐West Pacific palaemonoid shrimps (Crustacea: Decapoda: Palaemonoidea), principally from the New Caledonian region

“…But the ambulatory pereiopod varies with increasing habitat depth: shortest and most robust in P. hachijo (shallow waters, 0-45 m); moderately long and slender in P. dolichodactylus (shallow to deep waters, 16-250 m); longest and most slender in P. komaii (deep water, 327-360 m). The posteroventral angle of the fifth abdominal somite is not a stable character to distinguish P. dolichodactylus and P. hachijo, as used by Okuno (1999) and Bruce (2002b), because all specimens of P. dolichodactylus we have checked (including the two specimens of Bruce 1991a) have acute tooth on the posteroventral angle of fifth abdominal pleuron.…”