Laticallichirus Komai, Yokooka, Henmi and Itani, 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 : 111-112

Laticallichirus Komai, Yokooka, Henmi and Itani, 2019

Laticallichirus Komai et al., 2019: 463–466 .

Type species. “ Neocallichirus” grandis Karasawa and Goda, 1996 , by original 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 divided into 2 sections by unsclerotised band; tergite weakly sclerotised, if so only posteriorly; pleura oblique thin rods independent of tergite dorsally, separated by extensive flexible region; sternite a thin transverse plate. Antennular peduncle length more than 3 times the width of both eyestalks, longer than antennal peduncle. Maxilliped 3 ischium and merus broad, less than twice as long as wide at their articulation; crista dentata absent; propodus about as wide as long, free distal margin clearly oblique. Male major cheliped merus with convex denticulate blade. 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. Pereopod 4 subchelate. Male pleopod 1 of 2 articles, article 2 longer than wide, with or without slight apical notch. Male pleopod 2 appendix interna absent. Pleopods 3–5 appendices internae barely emerging from endopod 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 concave between rounded posterolateral corners, with transverse row of robust setae.

Remarks. The type species was described from Japanese Middle Pleistocene fossil chelipeds but extant specimens enabled the species to be described more completely. Komai et al. (2019) compared the new genus with several others. Their phylogram based on the 16S rRNA gene found the species closest to Callichirus and more remote from a clade including Neocallichirus , Corallianassa , Glypturus , Glypturoides and Lepidophthalmus . The genus appears closest to Michaelcallianassa , as our key indicates.