Redescription of the fish-parasitic isopod Cymothoa ianuarii Schioedte & Meinert, 1884 and further records of C. excisa Perty, 1833 and C. oestrum (Linnaeus, 1758) (Isopoda: Cymothoida: Cymothoidae) from Brazil

Cymothoa ianuarii Schioedte & Meinert, 1884 is rediscovered almost 136 years after its original description and redescribed from specimens collected in the state of São Paulo. This species is mainly characterized by adult females with cephalon with conspicuous eyes and not deeply immersed in pereonite 1, pereonites 5-6 much wider than 4, pleotelson twice as wide as long and pleopods 1-5 decreasing in size; Cymothoa excisa Perty, 1833 and C. oestrum (Linnaeus, 1758) are recorded from the state of Bahia. Illustrations and an updated distribution map for these species in Brazil are provided.

A new species and depth record of bopyrid (Crustacea, Isopoda) from a squat lobster in the Kuril-Kamchatka Trench

The branchial parasitic isopod Pleurocryptella altalis sp. nov. (Bopyridae: Pseudioninae) is described from the squat lobster host Munidopsis petalorhyncha Baba, 2005. The new species is morphologically similar to Pleurocryptella formosa Bonnier, 1900 and P. wolffi Bourdon, 1972b but can be distinguished based on male characters (differences in head, pleon and uropods) and female characters (differences in barbula, pleopods and pleotelson). The parasite specimens (a female and male pair) were collected with the squat lobster host at a depth of 5060–5130 m from the Kuril-Kamchatka Trench, representing the deepest record for any of the 850+ described bopyrid isopod species and for any record of an infested host. Dichotomous identification keys to females and males of Pleurocryptella species and subspecies are provided.

A new species of the genus Parioninella (Epicaridea, Bopyridae, Pseudioninae) from Australia

Two new records of the rare parasitic isopod genus Parioninella are described. Parioninella liuruiyui n. sp. represents the first record of the genus from Australia and the first bopyrid described from the porcelain crab Pachycheles pisoides (Heller, 1865). The female of the new species differs from other described species in lacking eyes, produced into pair of anterolateral flaps, the brood pouch completely covered by oostegites, while the male lacks pigmentation. Parioninella astridae Nierstrasz & Brender à Brandis, 1930 is recorded from Mindoro, Philippines, in Pachycheles sculptus (H. Milne Edwards, 1837). An identification key to the three Parioninella species is provided.

First occurrences of Nerocila bivittata on Dusky Grouper (Ephinephelus marginatus) and Mottled Grouper (Mycteroperca rubra)

The parasitic Isopod Nerocila bivittata was collected from caudal fins and body surface of dusky grouper (Ephinephelus marginatus) and mottled grouper (Mycteroperca rubra) captured by commercial trawl vessels as non-target species from Antalya Bay which is located in the eastern Mediterranean coast of Turkey. The parasites caused typically hemorrhages on caudal fins of both hosts. The parasitic isopod was identified as Nerocila bivittata which has not been reported from groupers in the worldwide. The study represents new hosts and geographical records.