Lebbeus fujimotoi Matsuzaki, Hibino & Komai, 2015

Komai, Tomoyuki & Matsuzaki, Koji, 2022, Three new species of the thorid shrimp genus Lebbeus White, 1847 (Decapoda: Caridea) from Nemuro Strait, Hokkaido, Japan, with supplemental note on L. fujimotoi Matsuzaki, Hibino & Komai, 2015, Zootaxa 5133 (2), pp. 151-181 : 174

Lebbeus fujimotoi Matsuzaki, Hibino & Komai, 2015

( Fig. 13 , 14 )

Lebbeus fujimotoi Matsuzaki, Hibino & Komai, 2015: 311 , figs. 2–5.

Material examined. CBM-ZC 16702 , 1 male (cl 19.6 mm), Nemuro Strait , off Rausu, 26 August 2015, commercial trap for pandalids, coll. K. Matsuzaki, DNA voucher ; CBM-ZC 16703 , 1 ovigerous female (cl 23.2 mm), Nemuro Strait , off Rausu, 44°01.17’N, 145°22.50’E, 660–870 m, 7 July 2017, commercial trap, coll. K. Matsuzaki; CBM-ZC 16704 , 1 ovigerous female (cl 23.8 mm), same data , DNA voucher; CBM-ZC 16705 , 1 ovigerous female (cl 24.0 mm), same data ; CBM-ZC 16706 , 1 ovigerous female (cl 25.5 mm), same data .

Remarks. The present male specimen (CBM-ZC 16702) differs from the type series of Lebbeus fujimotoi in the slender, slightly sinuous rostrum with six dorsal (the anteriormost tooth is located at the midlength) and nine ventral teeth and the possession of an epipod on the pereopod 1. In the type specimens of L. fujimotoi , consisting of four females and one male, the rostrum is noticeably curved dorsally, with four dorsal and seven or eight ventral teeth; the anteriormost tooth of the dorsal rostral series is located at the proximal 0.2–0.3; the pereopod 1 is devoid of epipod ( Matsuzaki et al. 2015). Nevertheless, the COI sequence of the male specimen is almost identical (K2P divergence 0.3%; Table 3 ) with that of one of the ovigerous female specimen (CBM-ZC 16704), which closely agrees with the type series in morphological aspects. Consequently, the male specimen is referred to L. fujimotoi . This finding indicates that the development of epipod on the pereopod 1 is variable in L. fujimotoi . Similar variation in the development of the epipod on the pereopod 1 is also known in L. elegans , the another species normally lacking epipod on the pereopod 1 (Komai et al. 2004).

Genetic divergences between L. fujimotoi and other known congeneric species are 3.3–24.9% (COI) ( Table 3 ) and 1.1–6.8% (16S) ( Table 4 ).

Figures

FIGURE 13. Lebbeus fujimotoi Matsuzaki, Hibino & Komai, 2015, male (cl 19.6 mm), CBM-ZC 16702, habitus in lateral view.

FIGURE 14. Lebbeus fujimotoi Matsuzaki, Hibino & Komai, 2015, male (cl 19.6 mm), CBM-ZC 16702, rostrum and anterior part of carapace in lateral view.