On the penaeid shrimps of the genus Metapenaeus Wood-Mason in Wood-Mason & Alcock, 1891 (Crustacea, Decapoda, Penaeidae) of Taiwan Author Hsu, Yen-Cheng 0000-0001-5829-1793 Institute of Marine Biology, National Taiwan Ocean University, Keelung 202301, Taiwan, R. O. C. & 222 otter @ gmail. com; https: // orcid. org / 0000 - 0001 - 5829 - 1793 222otter@gmail.com Author Chen, Chien-Lin 0000-0002-7037-0213 Institute of Marine Biology, National Taiwan Ocean University, Keelung 202301, Taiwan, R. O. C. & reginald @ mail. ntou. edu. tw; https: // orcid. org / 0000 - 0002 - 7037 - 0213 reginald@mail.ntou.edu.tw Author Chan, Tin-Yam Institute of Marine Biology, National Taiwan Ocean University, Keelung 202301, Taiwan, R. O. C. & Center of Excellence for the Oceans, National Taiwan Ocean University, Keelung 202301, Taiwan, R. O. C. text Zootaxa 2022 2022-08-01 5169 4 331 346 journal article 112246 10.11646/zootaxa.5169.4.3 64cc75c9-1cdf-4641-a238-04d83c141b95 1175-5326 6952478 E4BA0F07-43E6-4F1D-99E5-37A50AC33037 Metapenaeus tenuipes Kubo, 1949 ( Fig. 7 ) Metapenaeus tenuipes Kubo 1949: 348 , figs. 7R, 22B, 31G, H, 62B, B’, 74N, T, 81H, 125G, 127 ( type locality: Indonesia ).— Racek & Dall 1965: 82 , pl.7-fig.1, pl. 12-fig. 2.— Miquel 1982: 125 , figs. 58-59.— Yu & Chan 1986: 131 , 1 unnumbered fig.— Lee et al. 1999: 445 . Metapenaeus spinulatus Kubo 1949: 355 , figs. 7T, 47G, 74M, S, 81K, 129F, 130 [ type locality: Thailand ].— Lee & Yu 1977: 98 , figs. 68-69. Material examined. None. FIGURE 7. Metapenaeus tenuipes Kubo, 1949 , female cl about 28 mm (after Lee & Yu, 1977 ). a, cephalothorax, lateral. b, thelycum. Scales: a = 14 mm; b = 3 mm. Diagnosis. Based on descriptions of the single female collected by Lee & Yu (1977) . Rostrum with distinct basal crest, bearing 5 (excluding epigastric tooth) dorsal teeth restricted to basal crest; distal 1/2 unarmed; short and straight, extending to middle of second segment of antennular peduncle. Pereiopod I with ischial spine. Telson with rows of minute and 2 larger movable lateral spines. Female thelycum with anterior plate small and rounded; coxal projections of pereiopod IV round plate like and not extending to lateral plates; lateral plates large, somewhat rhombus-shape and anteriorly with a “W”-like notch, lacking median longitudinal furrow. Coloration. According to Miquel (1982) body generally whitish to yellowish with green dots. Uropods red margined and with distal part greyish green. Distribution. Western Pacific from Thailand to Indonesia , Philippines and Taiwan , intertidal to 30 m deep ( Miquel 1982 ; Pérez Farfante & Kensley 1997). FIGURE 8. a, Metapenaeus affinis (H. Milne Edwards, 1838) , male cl 22.2 mm (NTOU M02403 ). b, M. elegans De Man, 1907 , male cl 19.1 mm (NTOU M02319 ). c, M. ensis (De Haan, 1844) , female cl 32.7 mm (NTOU M02327 ). d, M. intermedius ( Kishinouye, 1900 ) , female, specimen lost, Dasi fishing port, Yilan county, 26 May 1988. e, M. joyneri ( Miers, 1880 ) , female cl 18.4 mm (NTOU M02338 ). f, M. moyebi ( Kishinouye, 1896 ) , male cl 12.3 mm (NTOU M02350 ). Remarks. Metapenaeus tenuipes can be readily separated from the other species of the genus in Taiwan by having a distinct basal rostral crest and a short rostrum ( Fig. 7a ). No specimen of this species has been collected again from Taiwan since Lee & Yu (1977) recorded a single female nearly half a century ago (1974). Although this female specimen (registration number M 750 in Lee & Yu 1977 ) is now missing (not found in the Taiwan Fisheries Research Institute and NTOU, the affiliated institutions of Lee and Yu respectively), its identity is unmistaken from the figures provided by Lee & Yu (1977 : figs. 68-69). According to Lee & Yu (1977) , the single specimen of this species was collected from the Keelung fishing port in northern Taiwan with landing sometimes from fishing boats operated overseas. Nevertheless, M. tenuipes may just be rare in Taiwan like M. elegans which also only has one single specimen collected since 1988 despite of the recent extensive surveys of the decapod crustacean fauna in Taiwan . According to Racek & Dall (1965) and Miquel (1982) , there are marked sexual dimorphisms in M. tenuipes and with males having low basal rostral crest. This is also why Kubo (1949) named females of this species as M. tenuipes while males as M. spinulatus .