Holophryxus fusiformis SHIINO 1937

• 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; Holophryxus fusiformis; Arctic
• Online Access: https://zenodo.org/record/8011059; https://doi.org/10.5281/zenodo.8011059

HOLOPHRYXUS FUSIFORMIS SHIINO, 1937 Original description: Shiino (1937): 188–191, figs 1, 2 (♀ and ♂). Additional descriptions: Huang et al. (2018): 44–50, figs 1–5 (♀ and ♂). Shimomura et al. (2020): 46, 47, fig. 1. Hosts: Prehensilosergia prehensilis (type host), L u c e n s o s e r g i a l u c e n s, S e r g i a l a m i n a t a (a l l Dendrobranchiata, Sergestidae). Distribution: Taiwan, Japan. Differential diagnosis: Holophryxus. Body length 9.7 mm (♀), 1.6 mm (♂) (Shiino, 1937); 7.00– 7.50 mm (non-ovigerous ♀♀; N = 2), 6.8–10.12 mm (ovigerous ♀♀; N = 14), 1.24–1.65 mm (♂♂; N = 10) (Huang et al., 2018); 9.0 mm (ovigerous ♀; N = 1) (Shimomura et al., 2020). Colour yellowish white in ♀ and white in ♂, in ethanol (Shiino, 1937); predominantly beige and yellow in ♀, pleon pale green; white in ♂ (Huang et al., 2018); orange in ♀ (Shimomura et al., 2020). FEMALE: Body spindle shaped, about 2.2–2.3 times as long as maximum width in Taiwanese specimens, 1.95 times in Japanese specimens. Cephalon only slightly demarcated from pereon in dorsal aspect by weak constrictions bilaterally and transverse surface fold dorsally; dorsal prominence with emarginate (bilobed) anterior margin; ventral cephalic ridge partly discernible in dorsal aspect, slightly arched, about 0.4 times as long as wide, anterior margin with medial incision producing slightly bilobed appearance, without paired pit organs; posterolateral corners of cephalic ridge with pointed processes, representing coxal plates of incorporated first pereonite. Maxilliped present, bilobate, inner margin deeply concave. Median sternal plate without paired posteriorly directed appendices. Pereon with five pairs of incubatory plates; oostegite 1 bilobate, with medial projection on proximal lobe; oostegite 5 unilobate, covering 64% of ventral side of body, posterior margin with 10–12 minute, spinular extensions. Coxal plates of pereopods 2–5 expressed, represented by pointed processes on lateroventral margins of pereon, separated by transverse folds. Posterior part of ...