Capitoniscidae Boyko & Williams 2023, n. fam.

• Main Authors: Boyko, Christopher B., Williams, Jason D.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2023
• Subjects: Biodiversity; Taxonomy; Animalia; Cryptoniscoidea; Capitoniscidae; Southern Ocean; Pacific; Menzies
• Online Access: https://zenodo.org/record/7781617; https://doi.org/10.5281/zenodo.7781617

Family Capitoniscidae n. fam. (Fig 4A–D, I) http://zoobank.org/ urn:lsid:zoobank.org:act: 74A054D1-D0A9-4034-BC19-0B809F43FA3E Diagnosis: Cryptoniscus larva /male body elongate. Head wider than long, anteroposteriorly inflated, posterior margin wider than pereomere 1; eyes absent. Antennule article 1 short, rounded, without marginal teeth; dense setal brush present. Coxal plates with weak marginal crenulations but without teeth. Pereopods 1–3 gnathopodal, 1 and 2 with globular propodi and thick dactyli extending to distal margin of merus, pereopod 3 with ovate propodus and slender dactylus extending to distal margin of carpus; pereopods 4–7 ambulatory with propodi tapering distally; all pereopodal dactyli bearing a distal tooth. Pleotelson triangular, with or without distal row of few stout teeth. Mature female spheroid in dorsal view, unsegmented, possibly with two pairs of pereopods and two pairs of posterior tubercles. Parasitizing cumaceans. Included genera and species: Capitoniscus Bourdon, 1972, type genus (type species = Capitoniscus cumacei Bourdon, 1972 by monotypy); Capitoniscus australis Bourdon, 1981; Capitoniscus peruvicus (Menzies & George, 1972) n. comb.; Carocryptus Schultz, 1977 (type species = Carocryptus laticephalus Schultz, 1977 by original designation). Distribution: Off coast of South Africa (35°44’S, 34°16’E), 3800 m (C. cumacei) (Bourdon 1972); South Pacific Ocean (50°06’S, 127°31’W – 50°12’S, 127°30’W), 3914 m (C. australis) (Bourdon 1981a); off coast of Peru (09°05’S, 80°43’W), 5586–5648 m (C. peruvicus n. comb.) (Menzies and George 1972); Southern Ocean (64°58’S, 114°13’W – 65°19’S, 114°06’W), 3312 m (C. laticephalus) (Schultz 1977). Host: Cumacea: Bathylamprops natalensis Jones, 1969 (Bourdon, 1972) for C. cumacei; hosts of other species not known. Remarks: The three species of Capitoniscus and one of Carocryptus are very similar in all known characters. Of these species, only C. cumacei was described based on a male associated with a female; all others are known only from the ...