Pasiphaea major Hayashi 2006

Pasiphaea major Hayashi, 2006 (Figures 3A, 4, 5) Pasiphaea major Hayashi, 2006: 219, figs. 9–11; De Grave & Fransen 2011: 258; Rodrigues & Cardoso 2019: 323. Material Examined. 1 male (cl 60.6 mm), ReviZEE— North Score, 05°5'42"N, 050°20'7"W, Amapá state, 742 m, muddy bottom, parasitized (Labcrus: 76.2.2A). 1 female (cl 49.9 mm), ReviZEE- North Score, 04°07'5"N, 049°5'24"W, Amapá state, 516 m, muddy bottom, non-parasitized (Labcrus: 76.2.2B). 2 males (cl 68.1 mm, 51.9 mm), ReviZEE- North Score, 04°13'27"N, 049°12'11"W, Amapá state, 782 m, muddy bottom, parasitized (Labcrus: 76.2.2C). 1 female (cl 58.5 mm), ReviZEE— North Score, 04°15'47"N, 049°8'10"W, Amapá state, 912 m, muddy bottom, parasitized (Labcrus: 76.2.2D). Distribution. Indian and Pacific Oceans: Norfolk Ridge, Lord Howe Ridge, New Caledonia, Wallis & Futuna, Marquesas Islands, Tonga Island and Madagascar (Hayashi 2006). Atlantic Ocean: Brazil (Amapá [Fig. 5], Rio de Janeiro, Espírito Santo, Bahia) (Rodrigues & Cardoso 2019). Depths from 226 to 1890 m. Remarks. The material herein examined agrees with the description of Hayashi (2006) and the diagnosis of Rodrigues and Cardoso (2019) in all characters, including the rostrum with a basal slit, the merus of the first and second pereopods with 2–10 and 10–20 spines, respectively; and the posterior margin of telson forked. The rostrum in the non-parasitized examined specimen is overreaching the anterolateral margin of the carapace (Fig. 3A), while in the parasitized specimens (see explanation below) it reaches or overreaches the anterolateral margin of carapace (Fig. 4B–D). It is interesting to note that four out of five examined specimens were bearing one or two parasites attached to the rostral base. According to Shields (1994), Hendrickx (2013) and Martinelli Filho et al. (2022), the protist family Ellobiopsidae is widely encountered as a parasite of crustacean species such as copepods, euphausiids, anomuran, lobsters, crabs and shrimps (Acanthephyridae Spence Bate, 1888, Oplophoridae Dana, 1852 and Pasiphaeidae). For Pasiphaeidae, two genera Ellobiopsis Caullery, 1910 and Thalassomyces Niezabitowski, 1913 have been reported as parasites in Pasiphaea species. Two species of this alveolate genus (T. capillosus Boschma, 1959 and T. racemosus Boschma, 1959) were found as endo- and ectoparasite in the species: P. acutifrons Spence Bate, 1888; P. cristata Spence Bate, 1888; P. emarginata Rathbun, 1902; P. tarda Krøyer, 1845; P. pacifica Rathbun, 1902 and P. multidentata Esmark, 1866 collected along in the Indian and Pacific Oceans (Boschma 1956; McCauley 1962; Cornejo De Gonzalez & Antezana 1980) In the examined specimens, we observed an Ellobiopsidae identified as Thalassomyces sp., with ramifications of its body on the rostrum of the host as a plaque embedded in the tissue and a tuft of stalked sacs arising from either side (Fig. 4A), causing deformations (Fig. 4 B-D). The association between Thalassomyces sp. and P. major is new, as is the occurrence of the genus in the South Atlantic Ocean.