Bopyrissa Nierstrasz & Brender

Williams, Jason D., Boyko, Christopher B. & Madad, Asma Z., 2019, Branchial parasitic isopods (Crustacea: Isopoda: Bopyridae: Pseudioninae) of hermit crabs (Crustacea: Decapoda: Diogenidae) from the western Pacific, with descriptions of a new genus and three new species, Raffles Bulletin of Zoology 67, pp. 83-118 : 91-92

Bopyrissa Nierstrasz & Brender à Brandis, 1931

Bopyrissa Nierstrasz & Brender à Brandis, 1931: 176–177 [type species: Bopyrissa magellanica Nierstrasz & Brender à Brandis, 1931, by monotypy].

Urocryptella Codreanu & Codreanu, 1963: 284 [unavailable name; type species not designated in original publication as required by ICZN, 1999: Article 13.3].

Diagnosis. Female body elongate, curved dextrally or sinistrally into s-shape; all segments distinct. Frontal lamina weakly developed, smooth. Barbula with either two lateral projections (outer usually more than three times as long as inner) or single lateral projection; medial region smooth or with few low lobes. Maxilliped with or without palp. First oostegites with tapered to sharply recurved posterolateral point; internal ridge smooth or with few low projections. Coxal plates weakly developed on pereomeres 1–4 on at least one side; tergal projections not present; pereomeres 2 and 3 subequal in breadth, broader than four; lateral margins of pereomeres 1–6 subquadrate; transition in shape from pereomeres 1–6 gradual, 1–4 not abruptly different than 5–6. Pereopods with short carpi, scales on outer surface of meri, and dorsal surfaces of bases not expanded. Six pleomeres, first five dorsally visible and produced into weakly developed lateral plates, directed posterolaterally; sixth pleomere ventrally displaced, not visible in dorsal view; overall pleon much narrower than pereon but not markedly narrower than posterior pereomere; four or five pairs of biramous, lanceolate pleopods, edges and surfaces smooth or tuberculate; uropods present, lanceolate, uniramous, edges and surfaces smooth.

Male body gradually tapered anteriorly and posteriorly from widest pereomere; all body regions distinct. Anterior pereopods not markedly larger than others. Pleon of six distinct pleomeres; pleopods uniramous, tuberculiform; posterolateral margins of pleotelson slightly to strongly produced into posterolateral lobes; no uropods. Worldwide distribution in temperate and tropical waters, infesting hosts in Paguroidea.

Remarks. Prior to the present study, there were seven species included in Bopyrissa ( Boyko et al., 2008 onwards). Herein, we describe two new species and transfer Pseudione novaeguineensis Danforth, 1971 and P. kensleyi Williams & Schuerlein, 2005 , to Bopyrissa . Although P. novaeguineensis was incompletely described, Danforth (1971, p. 100) clearly stated that the sixth pleomere, which he called the telson, was “fused to the mid-ventral surface of pleomerere V” and examination of the female holotype confirms this. This character places the species in Bopyrissa rather than Pseudione Kossmann, 1881 . Danforth’s (1971) Figure 1F also shows a ventrally displaced sixth pleomere, therefore what appears to be the sixth pleomere in his Figure 1B (dorsal view) are actually the uropods but apparently incorrectly drawn without a medial division between them. Bopyrissa kensleyi was described from a female with an abnormally developed posterior pleon and examination of a female with normal development shows that the species properly belongs in Bopyrissa . Bopyrissa dawydoffi ( Codreanu & Codreanu, 1963) was so incompletely described and lacking any illustrations that, while we follow Markham (1978) in placing it in Bopyrissa , the species may belong to another genus; topotypic material from Vietnam needs to be collected and studied.

Urocryptella was erected by Codreanu & Codreanu (1963) for three species: Pseudione diogeni Popov, 1929 , P. fraissei Carayon, 1943 and Urocryptella dawydoffi Codreanu & Codreanu, 1963 ; however, no type species was indicated and the name is unavailable (as per ICZN, 1999: Article 13.3). Markham (1978) and Bourdon (1979) regarded Urocryptella as a synonym of Bopyrissa .

Of the 14 currently recognised species of Bopyrissa , including two species described herein, seven are found within the Indo-West Pacific region ( Boyko et al., 2008 onwards): B. dawydoffi ( Codreanu & Codreanu, 1963) , B. kensleyi Williams & Schuerlein, 2005 , B. liberorum Markham, 1985b , B. marami , new species, B. novaeguineensis ( Danforth, 1971) , new combination, B. pyriforma ( Shiino, 1958) , and B. xiphidiostega , new species. All Bopyrissa species have been reported from diogenid hermit crabs ( Markham, 1985b; herein).

Figures

Fig. 1. Asymmetrione asymmetrica (Shiino, 1933), USNM 1493912 (A, B), JDW pers. coll. (E), and Asymmetrione harmoniae new species, USNM 1493917 (C, D). A, mature female, dorsal view; B, male paired with female shown in A, dorsal view; C, immature female, dorsal view; D, male paired with female shown in C, dorsal view; E, lateral view of Calcinus minutus doubly infested with Asymmetrione asymmetrica and Dipterosaccus sp. (two externae indicated by *). Scale bars = 1 mm (A, B, E); 500 µm (C, D).