Table. Comparison of shared synapomorphies between Basoniscus gen. nov. and Haploniscidae Hansen, 1916 and Joeropsididae Nordenstam, 1933. Rows may represent more than single character from the data matriX. Symbols: ‡ = shared only with Joeropsididae; * = shared only with Haploniscidae; † = shared with both families. in A new family of Asellota (Crustacea, Isopoda) from the deep sea of Zealandia

Table. Comparison of shared synapomorphies between Basoniscus gen. nov. and Haploniscidae Hansen, 1916 and Joeropsididae Nordenstam, 1933. Rows may represent more than single character from the data matriX. Symbols: ‡ = shared only with Joeropsididae; * = shared only with Haploniscidae; † = shared with both families.
FeatureBasoniscus gen. nov.JoeropsididaeHaploniscidaeHead anterior marginno rostral projectionspaired angular projectionsvariousPerion shapebroad tergal projections †broad tergal projections †broad tergal projections †Pereion tagmosisnone3:4 (weakly)3:4Pereion coxal insertionsmidway between lateral margin & midline †midway between lateral margin & midline †midway between lateral margin & midline †Posterior pereionitesprojecting, lateral margins confluent *projecting posterolaterallyprojecting, lateral margins confluent *Coxae positionsventral, midway between lateral margin and midline, not converging medially †ventral, midway between lateral margin and midline, not converging medially †ventral, midway between lateral margin and midline, not converging medially †Oostegitesdevelop internally only †develop internally only †develop internally only †Cuticular organ (spermathecal duct)opening anterodorsally on pereionite 5 †, covered by pereionite margin ‡opening anterodorsally on pereionite 5 †, covered by pereionite margin ‡opening anterodorsally on pereionite 5 †, exposed dorsallyPenesCovered by pereionite 7 margin ‡Covered by pereionite 7 margin ‡Covered † or not covered by pereionite 7 marginPleopodal chamberenclosed, set anterior to posterior margin *open posteriorly, extends to posterior marginenclosed, set anterior to posterior margin *Anus positionventral, postanal marginposteroventral, no marginposteroventral, no marginClypeusanteriorly flattened *anteriorly roundedanteriorly flattened *Clypeusprojecting to dorsal margin ‡projecting to dorsal margin ‡not projecting to dorsal marginClypeusdorsally angular *dorsally roundeddorsally angular *Labrumshallower and narrower than clypeus †shallower and narrower than clypeus †shallower and narrower than clypeus †Antenna exopodarticulated lobeabsentspine, fused to article 3Antenna flagellum first articlesingle, unmodified *conjoint, enlargedsingle, unmodified *Mandible molar processcylindrical, distally two ridges of sharp denticles distally spinulate spines posteriorly *long curved rod, no denticles or spinulescylindrical, distally two ridges of sharp denticles distally spinulate spines posteriorly *Mandible incisor process and lacinia mobilisnot enlarged, distal cusps only, left lacina distinct *enlarged, blade-like, with dorsal and distally dentate lobes, left lacina reduced, similar to spine rownot enlarged, distal cusps only, left lacina distinct *Maxilliped enditewith distomedial concavity †with distomedial concavity †with distomedial concavity †Maxilliped epipodprojecting beyond palp insertion *shorter than distance to palp insertionprojecting beyond palp insertion *Maxilliped palparticle 2 narrow, article 5 longer than wide *article 2 broad, article 5 tinyarticle 2 narrow, article 5 longer than wide *Pereopod II–VII dactylar ventral clawmore robust than dorsal claw ‡more robust than dorsal claw ‡tiny to absentPleopod IV exopoddistally narrowing margins ‡distally narrowing margins ‡vestigial unarticulated budUropod protopodbroad, covering anus ‡broad, covering anus ‡short, rod like, not covering anusUropod exopodsquat ‡squat ‡absent