Basoniscus, Wilson, 2024

Wilson, George D. F., 2024, A new family of Asellota (Crustacea, Isopoda) from the deep sea of Zealandia, European Journal of Taxonomy 917 (1), pp. 122-151 : 134

Basoniscus gen. nov.

urn:lsid:zoobank.org:act:505F93B6-43AF-4DE0-99CF-5868A3627763

Figs 5–12

Type species Basoniscus hikurangi gen. et sp. nov., monotypic.

Etymology

The genus name is composed of ʻbasalʼ (or ʻbasisʼ), referring to its basal position in the phylogeny of the Haploniscidae and Joeropsididae , and the common word for isopod ʻoniscusʼ. The name is construed as masculine.

Remarks

See the diagnosis for the family Basoniscidae fam. nov. Without additional taxa in the family, diagnoses for the genus and species would be ad hoc.

Figures

Fig. 5. Basoniscus hikurangi gen. et sp. nov. A–C. Holotype ♂, NIWA162662. A. Habitus, dorsal oblique. B. Head, ventral view. C. Pleotelson, ventral view. D–E. Paratype ♂♂, ZMB34579. D. Both paratypes, dorsal (left) and lateral oblique (right) views. E. Left paratype, ventral view. Scale bars = 1 mm.

Fig. 6. Basoniscus hikurangi gen. et sp. nov., holotype ♂, NIWA162662. A. Dorsal habitus with enlargment of head right lateral margin, shaded regions indicate position of vas deferens. B. Antennula, dorsal view. C. Antenna, dorsal view. D. Pereiopod I, with enlargment of dactylus and propodus. E. Pereiopod II, with enlargements of setal groups on merus and carpus. Scale bars: A = 1 mm; B–C = 0.5 mm; D–E = 0.5 mm.

Fig. 7. Basoniscus hikurangi gen. et sp. nov., holotype ♂, NIWA162662. A. Pleotelson and posterior part of pereionite 7, ventral view. B–C. Pleopod I and enlargement, dorsal right side of distal lobes. D. Pleopod II, dorsal side. E. Uropod, right side. Scale bars: A = 0.5 mm; B–D = 0.1 mm; E = 0.1 mm.

Fig. 8. Basoniscus hikurangi gen. et sp. nov., paratype ♀, NIWA162663. A. Lateral habitus.B. Enlargement of head, lateral view. C. Dorsal habitus. D. Enlargement of area in box on C, showing internal reproductive organs in pereionites 3–5, ovary and cuticular organ. E. Enlargement of internal reproductive organs. Scale bar: A, C = 1 mm. Indications: per = pereionite.

Fig. 9. Basoniscus hikurangi gen. et sp. nov., paratype ♀, NIWA162663. A. Head, ventral view. B. Right mandible, dorsal view. C. Right incisor process and spine row, anterior view. D. Right molar process, anterior view.E. Left mandible, dorsal view. F. Incisor process and lacinia mobilis, anterior and posterior views. G. Palp. H. Paragnaths, ventral view. Scale bars: A = 0.5 mm; B = 0.1 mm; E–F = 0.1 mm; H = 0.1 mm. Indications: L = labrum; m = mandible; mxp = maxilliped.

Fig. 10. Basoniscus hikurangi gen. et sp. nov., paratype ♀, NIWA162663. A. Maxillula, ventral view. B. Maxilla, ventral view. C. Maxilliped with enlargement of endite distal tip. D. Pereiopod I, lateral view. E. Pereiopod I propodus and dactylus with enlargment of ventral margin seta. F. Pereiopod I dactylus. Scale bars: A–B = 0.1 mm; C = 0.1 mm; D = 0.2 mm.

Fig. 11. Basoniscus hikurangi gen. et sp. nov., paratype ♀, NIWA162663. A. Pereiopod II, left, with enlargements of setal groups on merus and carpus. B. Pereiopod II, right, dactylus and distal part of propodus showing articular plate.C. Pereiopod III, left. D. Pereiopod II, enlargements of propodus distal setal group. E. Pereiopod IV, left. F. Pereiopod V, left. Scale bars: A, C = 0.1 mm; E–F = 0.2 mm.

Fig. 12. Basoniscus hikurangi gen. et sp. nov., paratype ♀, NIWA162663. A. Pereiopod VI, right. B. Pereiopod VII, left, with enlargement of propodal marginal seta. C. Pleopod II, ventral view. D. Pleopod III, ventral view. E. Pleopod IV, ventral view. F. Pleopod V, ventral view. G. Uropod, left, ventral view. Scale bars: A–B = 0.2 mm; D–F = 0.2 mm; G = 0.2 mm.