New Records of Pseudionine Bopyrid Isopods, including two new Species and one new Genus, infesting Porcellanid Crabs (Decapoda: Anomura) on the Pacific coast of North and Central America

Abstract

Aporobopyrus bourdonis, new species, earlier reported from the Pacific coast of Mexico but never described, infests Petrolisthes edwardsii (de Saussure), the same host species as before, in Costa Rica. Aporobopyrus muguensis Shiino, 1964, previously reported several times along the coast of California infesting Pachycheles rudis Stimpson and P. pubescens Holmes, is redescribed on the basis of material from Monterey, California, infesting P. pubescens. Aporobopyrus trilobatus (Nierstrasz and Brender a Brandis, 1925), previously known from the Caribbean Sea and the Pacific coast of Mexico, infests Petrolisthes ortmanni Nobili, a new host record, in Costa Rica. Discomorphus magnifoliatus, new genus, new species, infests Petrolisthes cinctipes (Randall) in central California. Synonymies are given for all species. BOPYRID ISOPODS OF PACIFIC AMERICAN COAST 147

Bopyrid isopods of the genus Aporobopyrus infesting porcellanid crabs (Decapoda: Anomura) in the Gulf of California, Mexico: new host and parasite records

“…The oostegites close completely the brood pouch of the adult female, the posterior margin of oostegites 2-4 bear small setae whilst the fifth bears a row of long setae, agreeing with previous reports (Bourdon 1976, Markham 2008. Oostegites 2-5 of the juvenile female are not entirely developed, they are rectangular, do not reach the ventral midline of the female and lack setae on their posterior margins.…”

“…''Pseudioninae sur Petrolisthes edwarsi (de Saussure)' ' Bourdon 1976: 236-238, 241 (in 1985, CNCR 19408. 1 juvenile female, 1 male (host unknown; parasite detached); Isla San Lorenzo, Baja C a l i f o r n i a , M e x i c o ( 2 8 83 7 0 4 4 00 N , 112849 0 34 00 W), J.C. Nates and E. Lira coll., 14 Feb 1986, CNCR 19446. Distribution.-Isla San Lorenzo and Isla San Pedro Ma´rtir, Baja California, Mexico (this study); Bahía de Chamela, Jalisco, Mexico (Bourdon 1976) and Guanacaste, Costa Rica (Markham 2008).…”

“…Markham (1992) pointed out that there are relatively few species of bopyrid isopods known from the Pacific coast of the Americas, a pattern that becomes evident when the number of species reported for the Western Pacific (166) and those reported for the eastern Pacific (37) are compared . Twenty species of bopyrids are recognized from the Pacific coast of Mexico, five belonging to the subfamily Pseudioninae and only three to Aporobopyrus: A. bourdonis Markham, 2008 on Petrolisthes edwardsii (de Saussure, 1853), A. muguensis Shiino, 1964 parasitizing Pachycheles rudis Stimpson, 1859 and A. trilobatus (Nierstrasz & Brenderà Brandis, 1925) parasitizing Petrolisthes hians Nobili, 1901 (Markham 2008, Roma´n-Contreras 2008, but no bopyrids on porcellanids have so far been recorded in the Gulf of California. Only three species of pseudionines are known from the Gulf of California: Pseudione galacanthae Hansen, 1897 on Galacantha diomedae Faxon, 1893, Progebiophilus bruscai Salazar- Vallejo & Leija-Tristan, 1990 on Upogebia dawsoni Williams, 1986 and Ione cornuta Bate, 1865 on Neotrypaea gigas (Dana, 1852) (Roma´n-Contreras 2008.…”

“…Notwithstanding the fact that taxonomic or ecological data on diverse potential hosts of bopyrids is abundant in the literature, their associated parasites are often overlooked (Boyko & Williams 2009), hence the reappraisal of material already deposited in museums or institutional collections can provide an opportu-nity to increase the records and the knowledge about this group of parasites (Markham 2008). The present study is based on material collected during the ''Conservación de las islas en un mar en el desierto, Golfo de California'' project, which was conducted from 1985 to 1987 to create an inventory of the plant and animal species that inhabit the islands of the Gulf of California (Villalobos et al 1992).…”

An introduced Asian parasite threatens northeastern Pacific estuarine ecosystems

“…An et al's (2009) discovery of 4 new bopyrid species among 8 new records of bopyrids in Chinese mud shrimp further indicates that Japan is a conservative subsample of Asian bopyrid diversity. Nevertheless, 13 western North American taxonomists recognized and reported only 0.098 new bopyrid species per year in 22 publications since 1850 (Markham 1992(Markham , 2001(Markham , 2008 while 14 resident Japanese or visiting taxonomists discovered 1.02 new Japanese bopyrid per year in 37 publications since 1895 (Fig. 3).…”