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
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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
表 新属Basoniscus（gen. nov.）与1916年Hansen发表的哈氏水虱科（Haploniscidae Hansen, 1916）、1933年Nordenstam发表的约罗水虱科（Joeropsididae Nordenstam, 1933）的共有衍征对比 每行可对应数据矩阵中的一个或多个性状。 符号说明：‡ = 仅与约罗水虱科共有；* = 仅与哈氏水虱科共有；† = 与两个科均共有。 | 性状 | 新属Basoniscus | 约罗水虱科 | 哈氏水虱科 | | --- | --- | --- | --- | | 头部前缘 | 无吻突 | 成对角状突起 | 形态多样 | | 胸区形态 | 具宽阔背板突起† | 具宽阔背板突起† | 具宽阔背板突起† | | 胸节分组合 | 无分组合 | 3:4（较弱） | 3:4 | | 胸足基节着生位置 | 位于侧缘与中线之间† | 位于侧缘与中线之间† | 位于侧缘与中线之间† | | 后部胸节 | 突出，侧缘汇合* | 向后侧方突出 | 突出，侧缘汇合* | | 基节位置 | 腹位，位于侧缘与中线之间，不向内侧汇聚† | 腹位，位于侧缘与中线之间，不向内侧汇聚† | 腹位，位于侧缘与中线之间，不向内侧汇聚† | | 育卵板 | 仅内部发育† | 仅内部发育† | 仅内部发育† | | 表皮器官（受精囊管） | 开口于第5胸节背侧前方†，被胸节边缘覆盖‡ | 开口于第5胸节背侧前方†，被胸节边缘覆盖‡ | 开口于第5胸节背侧前方†，背侧暴露 | | 阴茎 | 被第7胸节边缘覆盖‡ | 被第7胸节边缘覆盖‡ | 被†或未被第7胸节边缘覆盖 | | 腹肢室 | 封闭，位于后缘前方* | 后端开放，延伸至后缘 | 封闭，位于后缘前方* | | 肛门位置 | 腹位，具肛后缘 | 腹后侧，无缘 | 腹后侧，无缘 | | 额板 | 前缘扁平* | 前缘圆润 | 前缘扁平* | | 额板 | 延伸至背缘‡ | 延伸至背缘‡ | 不延伸至背缘 | | 额板 | 背侧角状* | 背侧圆润 | 背侧角状* | | 上唇 | 比额板更浅更窄† | 比额板更浅更窄† | 比额板更浅更窄† | | 触角外肢 | 关节叶 | 缺失 | 与第3节愈合的棘突 | | 触角鞭肢第一节 | 单节，未特化* | 愈合，膨大 | 单节，未特化* | | 大颚臼突 | 圆柱形，远端具两列尖锐齿突，远端后侧具细棘* | 长弯曲杆状，无齿突或细棘 | 圆柱形，远端具两列尖锐齿突，远端后侧具细棘* | | 大颚切突和动颚片 | 未膨大，仅具远端齿尖，左动颚片明显* | 膨大，刃状，具背侧和远端齿状叶，左动颚片退化，类似棘列 | 未膨大，仅具远端齿尖，左动颚片明显* | | 颚足内叶 | 具远端内侧凹陷† | 具远端内侧凹陷† | 具远端内侧凹陷† | | 颚足外叶 | 超出触须着生位置* | 短于触须着生间距 | 超出触须着生位置* | | 颚足触须 | 第二节狭窄，第五节长大于宽* | 第二节宽阔，第五节极小 | 第二节狭窄，第五节长大于宽* | | 第2-7胸足指节腹爪 | 比背爪更粗壮‡ | 比背爪更粗壮‡ | 微小至缺失 | | 第4腹肢外肢 | 远端边缘收窄‡ | 远端边缘收窄‡ | 退化的无关节芽体 | | 尾肢原肢 | 宽阔，覆盖肛门‡ | 宽阔，覆盖肛门‡ | 短杆状，不覆盖肛门 | | 尾肢外肢 | 粗短‡ | 粗短‡ | 缺失
