Laurentgourretia Sakai, 2004

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 : 120-121

Laurentgourretia Sakai, 2004

Laurentgourretia Sakai, 2004: 557 .— Sakai, 2005b: 224.— Sakai,

2011: 515.— Sakai, 2017a: 1126, 1130.

Type species. Laurentgourretia rhopalommata Sakai, 2004 , by original designation and monotypy.

Diagnosis. Rostrum sharply triangular, produced to near apex of ocular lobes; anterolateral spines prominent. Maxilliped 3 merus with 2 or more mesiodistal spines; exopod absent. Minor cheliped merus lower margin smooth; propodus cylindrical, slightly swollen at midpoint, about twice as wide as long. Male pleopod 1 article 2 simple, tapering, without coupling hooks. Telson mostly parallel-sided, with rounded posterolateral corners. Remarks. The only species differs from other ctenochelids in the parallel-sided telson (fig. 18h) and having three meral spines on the maxilliped 3. Its chelipeds are unknown.

The only specimen (MNHN-IU-2014-11417) of the type species is a male with male-like pleopods and a gonopore on the coxa of pereopod 5 (figs 17k–m; GCBP observations), not a female as stated by Sakai (2004). The male pleopod 1 has only one weak suture, the second article half as long as the first and with eight marginal setae; the male pleopod 2 is essentially as in other ctenochelids. Its major cheliped is missing. Sakai (2004) diagnosed Laurentgourretia , distinguishing it from Gourretia , as having a “stick-like” eyestalk, a remarkably sharp scaphocerite, and maxilliped 3 lacking an exopod. The eyestalks are more wedge-shaped in our view (figs 16j, k), contiguous as in other ctenochelids but not as tapering in dorsal view. The scaphocerite is similar to that of Dawsonius , which also lacks an exopod on maxilliped 3. The anterolateral angles of the dorsal carapace are sharp, as is the anterodorsal angle of the branchiostegite (fig. 16k). The uropodal exopod has a distal notch as in Paragourretia but its margin has stronger marginal spiniform setae (fig. 16f).

The genus is sister to Dawsonius in the morphology phylogram; no molecular data are available.