Karumballichirus, Poore & Dworschak & Robles & Mantelatto & Felder, 2019

Poore, Gary C. B., Dworschak, Peter C., Robles, Rafael, Mantelatto, Fernando L. & Felder, Darryl L., 2019, A new classification of Callianassidae and related families (Crustacea: Decapoda: Axiidea) derived from a molecular phylogeny with morphological support, Memoirs of Museum Victoria (Mem. Mus. Vic.) 78, pp. 73-146 : 111

Karumballichirus gen. nov.

http://zoobank.org/urn:lsid:zoobank.org:act:E21E0313-3989-

4E03-BBB6-9F9844028DC0

Type species. Callianassa karumba Poore and Griffin, 1979 , by present designation and monotypy.

Diagnosis. Anterior branchiostegal lobe sclerotised, well produced anteriorly beyond junction with oblique branchiostegal ridge with which it articulates by means of a virtual condyle. Rostrum spine-like. Pleomere 1 tergite fused, divided into 2 sections by transverse groove or shoulder. Maxilliped 3 ischium and merus narrow, more than twice as long as wide at their articulation; propodus about as wide as long, free distal margin clearly oblique; exopod present. Male major cheliped merus lower margin straight, irregularly dentate, usually with 1 more prominent proximal denticulate tooth. Male minor cheliped much narrower than major, carpus longer than palm, fingers shorter than palm. Pereopod 3 propodus subpentagonal, with strong broadly rounded proximal lobe on lower margin, lower margin straight-concave or weakly convex. Pereopod 4 propodus simple, distally rounded on lower margin. Male pleopod 1 consisting of 2 articles, article 2 ovoid, with shallow apical notch between rounded subdistal lobe and curved acute apex. Male pleopod 2 appendix interna free, articulating, distal on mesial endopodal margin. Pleopods 3–5 appendices internae barely emerging from endopodal margin. Uropodal endopod with convex anterior margin, acute-rounded apex, straight-slightly curved posterior margin, longer than wide. Telson with convex lateral margins and rounded posterolateral corners, posterior margin straight or convex between tapering posterolateral margins.

Etymology. An alliteration of the name of the type species and Callichirus , type genus of the family.

Remarks. Karumballichirus differs from the most similar callichirid genera, Neocallichirus , in which it was most recently placed (see Sakai, 1988) and Corallianassa (see Komai et al., 2015) in possession of a short maxillipedal 3 exopod, a feature shared with Lepidophthalmus , which is its sister taxon on the molecular phylogram (Robles et al., in press). The type species was described in detail by Dworschak (2008). The type species was recognised as the extant representative of a group of similar fossil species by Hyžný et al. (2017).