Aqaballianassa Poore, Dworschak, Robles, Mantelatto & Felder, 2019, gen. nov.

Aqaballianassa gen. nov. http://zoobank.org/urn:lsid:zoobank.org:act:27E2FC97-B393- 48F5-B69F-83AFD8FF49D7 Type species. Callianassa aqabaensis Dworschak, 2003, by present designation. Diagnosis. Hermaphrodite. Triangular sclerite separate from branchiostegite at anterior end of linea thalassinica. Rostrum obsolete or obtusely triangular, flat, not reaching cornea. Pleomere 1 tergite undivided, or with weak transverse ridge. Pleomere 6 with sublateral ventral sharp ridge, flared posteriorly. Antennular peduncle articles 2 and 3 with single lateral row of 6–10 well-spaced long setae along lower margin. Mandibular molar calcified, swollen projection without sharp edge; incisor with few teeth. Maxilliped 3 merus wider at ischium-merus suture than long. Male major cheliped merus with oblique spine about one third to half-way along lower margin; propodus distal margin with small lateral tooth; dactylus with dense setae along upper margin. Minor cheliped two-thirds width of major cheliped, both flattened. Pereopod 3 propodus rectangular, lower margin deeply convex, leading to broadly rounded free proximal lobe. Male pleopod 2 present or absent. Uropodal endopod ovoid, usually longer than wide, anterior margin straight or slightly convex, posterodistal margin evenly convex, with spiniform setae near anterior and distal margins, or with facial spiniform setae on rib. Uropodal exopod 1.0–1.8 times as long as wide, distal margin clearly differentiated from anterior margin, anterodistal corner right-angled, posterodistal margin with row of 6–8 long blade-like setae proximal to long setae on distal margin. Telson anterolateral lobe obsolete, undefined; truncate or slightly convex between posterolateral angles, or slightly concave, sometimes with medial spine. Etymology. An alliteration of the name of the type species and Callianassa, type genus of the family. Remarks. The genus is recognisable by the unique triangular sclerite separated by a clear suture or discontinuity from the branchiostegite at the anterior end of the linea thalassinica. All specimens of A. aqabaensis have male and female gonopores, but pleopods 1 and 2 are sexually dimorphic (Dworschak, 2003; Markham and Dworschak, 2005). Two species are included besides the type species, A. brevirostris from Thailand and A. lewtonae from Queensland, plus an undescribed species from Papua New Guinea.新属Aqaballianassa gen. nov. http://zoobank.org/urn:lsid:zoobank.org:act:27E2FC97-B393-48F5-B69F-83AFD8FF49D7 模式种：Callianassa aqabaensis Dworschak, 2003，由本文指定。 鉴别特征：雌雄同体。胸甲linea thalassinica脊线前端的三角形骨片与鳃盖（branchiostegite）以清晰缝或间断处分离。额角退化或呈钝三角形，扁平，不伸达角膜。第一腹节背板不分叶，或具微弱横脊。第六腹节具亚腹侧尖锐脊，向后扩展。触角柄第二、第三节下缘具单排、间距均匀的6~10根长刚毛。臼突钙化、膨大，无尖锐边缘；切缘具少量齿。第三颚足长节在座节-长节接缝处的宽度大于其长度。雄性大螯长节下缘约1/3至1/2处具斜向棘；掌节远端缘具小侧齿；可动指上缘具浓密刚毛。小螯宽度为大螯的2/3，两者均扁平。第三步足掌节呈矩形，下缘深凸，延伸为宽大圆润的游离近侧叶。雄性第二腹肢存在或缺如。尾肢内肢呈卵圆形，通常长大于宽，前缘平直或微凸，后缘均匀凸圆，前缘与远端缘附近具刺状刚毛，或在脊面上具刺状刚毛。尾肢外肢长为宽的1.0~1.8倍，远端缘与前缘界限清晰，前侧角为直角；后缘远端部分的远端缘长刚毛的近端区域，具1排6~8根长刀片状刚毛。尾节前侧叶退化、无明确界限；后侧角之间平截或微凸，或微凹，有时具中棘。 词源：本属名由模式种名与该科模式属Callianassa的名称构成头韵。 讨论：该属可通过其独特的三角形骨片鉴别——该骨片与胸甲linea thalassinica脊线前端的鳃盖以清晰缝或间断处分离。所有A. aqabaensis标本均兼具雄性与雌性生殖孔，但第一、第二腹肢存在性二态性（Dworschak, 2003；Markham与Dworschak, 2005）。除模式种外，本属还包含2个已知种：产自泰国的A. brevirostris与产自昆士兰州的A. lewtonae，以及1个未描述的巴布亚新几内亚物种。