Michaelcallianassa Sakai, 2002

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 : 113

Michaelcallianassa Sakai, 2002

Michaelcallianassa Sakai, 2002: 480–481 .— Sakai, 2005b: 156–

157.— Sakai, 2011: 450.

Type species. Michaelcallianassa indica Sakai, 2002 , 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 obsolete or obtusely triangular, flat, not reaching cornea. Pleomere 1 tergite undivided or with weak transverse step. Pleomeres 3–5 with anteriorly converging longitudinal grooves and oblique-transverse rows of long setae. Antennular peduncle longer than antennal peduncle. 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. Male major cheliped merus with lower margin almost straight. Male minor cheliped half or more as wide as major, carpus as long as or shorter than palm, fingers as long as or longer 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 uniramous; appendix interna absent or reduced to obsolete distomesial lobe. Female pleopod 2 uniramous. 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 converging to about half basal width from near anterior width over most of length to rounded posterolateral corners, posterior margin concave between rounded posterolateral corners, with transverse row of robust setae.

Remarks. The two species of Michaelcallianassa have uniramous pleopods 2 in both sexes distinguishing the genus from all other callichirids (fig. 15n). The telson has a transverse row of robust setae. Sakai (2002) noted that the type species was similar to species of Callichirus but has a row of setae between the two dorsolateral tufts on pleomeres 4 and 5. This row is not present on the second species, M. sinica (see Liu and Liu, 2009).