Holophryxus Richardson 1905

• Main Authors: Huys, Rony, Savchenko, Alexandra S., Kosobokova, Ksenia N.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2023
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Dajidae; Holophryxus; Mueller; Arctic; Alaska
• Online Access: https://zenodo.org/record/8011021; https://doi.org/10.5281/zenodo.8011021

GENUS HOLOPHRYXUS RICHARDSON, 1905 A Synonyms Hypodajus Nierstrasz & Brender à Brandis, 1931 (type species: Hypodajus georgiensis Nierstrasz & Brender à Brandis, 1931; by monotypy); Cryptonus Schultz, 1977 (type species: Cryptonus truncatus Schultz, 1977; by original designation); Isophryxus Schultz, 1977 (type species: Isophryxus concavus Schultz, 1977; by original designation). Taxonomic history Holophryxus Richardson, 1905a is one of 22 valid genera currently recognized in the family Dajidae and, together with Notophryxus, the genus with the greatest number of species (Boyko et al., 2022). Richardson (1905a: 220) proposed the genus for its type and only species, Ho. alaskensis, and based her description on three adult females collected in south-eastern Alaska between 269 and 640 m depth. No males were collected and the host was unknown. Richardson (1905b: 576) reproduced her original description under the incorrect subsequent spelling Ho. alascensis and mentioned the discovery of another specimen collected by the U.S. Bureau of Fisheries steamer Albatross in southern California. Subsequently, other specimens of Ho. alaskensis became available, allowing the final host to be determined and the male and larval stages to be described. Butler (1964) provided descriptions of both sexes and the late juvenile stage based on material that was largely found attached to Pasiphaea pacifica Rathbun, 1902 (Pasiphaeidae) in British Columbian waters. Coyle & Mueller (1981) made a significant contribution to the life cycle of the species by describing the epicaridium, microniscus, cryptoniscus and juvenile stages based on material from Prince William Sound in Alaska. The discovery on the same shrimp host, P. pacifica, of adult females containing unmetamorphosed cryptoniscid stage males in the brood pouch, enabled them to identify the cryptoniscid larvae from plankton samples taken in the same area and trace the development back to the epicaridium stage. Coyle & Mueller (1981) identified the calanoid copepod ...