Thuylamea Nguyên, 2001

Komai, Tomoyuki, 2018, A new species of the alpheid shrimp genus Thuylamea Nguyên, 2001 (Crustacea: Decapoda: Caridea) from Yatsushiro Sea, Kyushu, Japan, Zootaxa 4378 (3), pp. 387-396 : 387-388

Genus Thuylamea Nguyên, 2001

[New Japanese name: Shiranui-teppou-ebi-zoku] Type species. Thuylamea camelus Nguyên 2001 , by original designation.

Emended diagnosis. Small alpheid shrimp with subcylindrical, elongated body. Carapace smooth; rostrum reduced; no armature on frontal margin; no ocular hood; pterygostomial angle rounded; cardiac notch deep. Pleon generally smooth; pleomere 6 without articulated plate at posterolateral angle. Telson with 2 pairs of dorsolateral spiniform setae; posterior margin rounded, each posterolateral angle with 2 minute spiniform setae. Antennular peduncle with stylocerite closely adjoining to lateral surface of article 1. Antenna with scaphocerite somewhat reduced in size. Eyestalks juxtaposed; corneas partially visible in dorsal and lateral views, darkly pigmented. Mandible with 2-articulated palp, molar process well developed, incisor process expanded, multidenticulate. Maxillule with terminally bilobed palp. Maxilliped 1 with 2-articulated palp; exopod with long flagellum; epipod large, leaf-like. Maxilliped 2 with long exopodal flagellum and large epipod. Maxilliped 3 normal; coxal lateral plate extending distally in triangular lobe, overhanging base of exopod. Pereopods 1 enlarged, similar, subequal; dactylus carried laterally, laminar, much broader than fixed finger, somewhat twisted, occlusal margin crenulate, terminating in acute claw exceeded by rounded terminal margin of dactylus at least in adult males; adhesive plaque and snapping system absent. Pereopod 2 carpus divided into 5 articles. Pereopods 3–5 moderately robust; dactyli simple. Pereopod 5 propodus with grooming apparatus consisting of obliquely transverse rows of short stiff setae. Uropodal exopod unarmed on diaeresis. Gill formula: 5 pleurobranchs (above pereopods 1–5); 1 arthrobranch (maxilliped 3); no podobranch; 2 lobe-shaped epipods (maxillipeds 1 and 2) and 5 strap-like, terminally hooked epipods (maxilliped 3 and pereopods 1–4), 5 sets of setobranchs (pereopods 1–5).

Composition. Thuylamea camelus (type species); and T. shiranui n. sp. (described below).

Remarks. See below.