Holophryxus acanthephyrae Stephensen 1912

• Main Authors: Huys, Rony, Savchenko, Alexandra S., Kosobokova, Ksenia N.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2023
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Dajidae; Holophryxus; Holophryxus acanthephyrae; Arctic; North Atlantic; Southern Ocean
• Online Access: https://doi.org/10.5281/zenodo.8011056; http://treatment.plazi.org/id/039587FE1D79FFD9FF02BF243191F8D9

HOLOPHRYXUS ACANTHEPHYRAE STEPHENSEN, 1912 Synonym: Isophryxus concavus Schultz, 1977. Original description: Stephensen (1912 —as H. Acanthephyrae ): 112–117, figs 13 (top), 15–21 (♀, ♂ and epicaridium). Additional descriptions: Jones & Smaldon (1986): 306–312, figs 1–6 (♀ and ♂). Schultz (1977 —as I. concavus ): 93–96, figs 17, 18A-H, O, P (♀ and ♂). Wasmer (1988): 21–23 (♀ and ♂). Alves-Júnior et al. (2019): 14 (♀). Boyko & Williams (2021b): 114–116, fig. 2A-C (♀ and ♂). Hosts: Acanthephyra acanthitelsonis , A. pelagica (type host) and A. purpurea (Pleocyemata, Acanthephyridae). Distribution: North Atlantic Ocean, south-western Atlantic Ocean, South Pacific Ocean, Southern Ocean (Table 2). Differential diagnosis: Holophryxus . Body length 22 mm (♀; N = 1), 0.2 mm (epicaridium) (Stephensen, 1912); 12.18–13.94 mm (♀♀; N = 2), 18.28–22.68 mm (ovigerous ♀♀; N = 2), 3.33 mm (♂; N = 1) (Jones & Smaldon, 1986); 8.5–21.6 mm (♀♀; N = 7), 2.6–3.4 mm (♂♂; N = 3) (Schultz, 1977); 22.7 mm (ovigerous ♀; N = 1), 2.3 mm (♂; N = 1) (Wasmer, 1988); 20.33 mm (♀; N = 1) (Alves-Júnior et al. , 2019); 13.7 mm (♀; N = 1), 2.0 mm (♂; N = 1) (Boyko & Williams 2021b). Colour in alcohol reddish brown spotted with yellow (Stephensen, 1912) or light yellow (Wasmer, 1988) in ♀; yellowish white in ♂ (Wasmer, 1988). FEMALE: Body oblong-ovate, about 1.9–2.2 times as long as maximum width. Cephalon only slightly demarcated from pereon in dorsal aspect by weak constriction bilaterally and transverse surface fold dorsally; dorsal prominence with emarginate (bilobed) anterior margin; part of ventral cephalic ridge clearly discernible in dorsal aspect (Fig. 15H, I), slightly arched, about 0.3 times as long as maximum width, anterior margin slightly sinuous, with pair of distinctive, slit-like pit organs; posterolateral corners of cephalic ridge with rounded processes, representing coxal plates of incorporated first pereonite. Maxilliped present, bilobate. Median sternal plate with paired posteriorly directed appendices. Pereon with ...