Redescription of Nanomysis siamensis W. M. Tattersall, 1921 (Crustacea: Mysida) after 100 years, with an update of its distribution in the Songkhla Lagoon System southern Thailand Author Yolanda, Rofiza 0000-0002-7792-0783 Division of Biological Science, Faculty of Science, Prince of Songkla University, 90112, Songkhla, Thailand, padangers @ gmail. com; https: // orcid. org / 0000 - 0002 - 7792 - 0783 padangers@gmail.com Author Sawamoto, Shozo School of Marine Science and Technology, Tokai University, 20 - 21 Orido, Shimizu, Shizuoka 424 - 8610, Japan. Present address: Tsukimi-cho 20 - 21, Shimizu-ku, Shizuoka-shi, Shizuoka 424 - 0853, Japan Author Lheknim, Vachira 0000-0002-7792-0783 Division of Biological Science, Faculty of Science, Prince of Songkla University, 90112, Songkhla, Thailand, padangers @ gmail. com; https: // orcid. org / 0000 - 0002 - 7792 - 0783 & vachira. l @ psu. ac. th; https: // orcid. org / 0000 - 0003 - 1668 - 2707 padangers@gmail.com text Zootaxa 2022 2022-04-07 5125 1 75 91 journal article 54976 10.11646/zootaxa.5125.1.5 2dbe3743-bca6-45f5-aac9-7b153cc2f202 1175-5326 6420461 00C1EB04-34B0-4009-9BD3-60E0429A050B

TABLE 2. Comparison of morphological characteristics among the three known species in the genus Nanomysis.

Characters	N. insularis Nouvel, 1957	N. philippinensis Murano, 1997	N. siamensis W.M. Tattersall, 1921
body length (mm)	male, 4.5	male, 2.1–2.9	male, 5.0	male, 2.9–4.8
	female 4.5	female, 2.8–3.2	female, 4.0	female, 3.0–5.4
frontal margin of carapace	armed with short spines and 1	armed with short spines without	armed with short spines and 1	armed with short spines and 1
	stout triangular median process	median process	stout triangular median process	stout triangular median process
Eyes	sub-globular, cornea slightly	sub-quadrangular, cornea 2/5 of eye	no description	sub-quadrangular, cornea 2/5 of
	equal to 1/2 of eye			eye
number of setae posterior 1/3	2 setae in female, without seta in	no description	no description	4 curved setae in female and male
of lateral margin of 1st article	male
of antennule
antennal scale	ca. 6 times as long as wide	ca. 5 times as long as wide	ca. 7 times as long as wide	ca. 6–7 times as long as wide
number of setae on 2nd article	2 setae on inner and 13 setae on	1 seta on inner and 7 setae on outer	no description	2 setae on inner and 7 to 8 setae
of mandibular palp	outer margins	margins		on outer margin
number of setae on 3rd article	17 short barbed setae, 1 simple	13 short barbed setae, 1 simple seta	no description	14 short barbed setae, 1 simple
of mandibular palp	seta and 1 long barbed seta	and 1 long barbed seta		seta and 1 long barbed seta
number of setae on precoxal	3 long barbed and 5 simple setae	4 long barbed and 5 simple setae	no description	5 long barbed and 4 simple setae
lobe of maxillule
flagellum of 1st and 8th	8 and 9 articles	8 articles	no description	9 and 8 articles
thoracopodal exopods
number of antler-shaped spines on the merus of 8th thoracopo-	1 spine	no description	no description	1 or 2 spines
dal endopod
number of setae on the 3rd	5 on first, 1 on second and 1 on	1 on first, 2 on second and 1 on third	3 on first, 1 on second and 1 on	3 on first, 1 on second and 1 on
exopodal pleopod	third articles	articles	third articles	third articles
number of setae on first article of male 4th exopodal pleopod	8 setae	5 setae	3 setae	5–7 setae
length relation uropodal	0.7 times as long as exopod	0.9 times as long as exopod	ca. 0.9 times as long as exopod	0.7 times as long as exopod
endopod and exopod
spines on lateral margin of	11–12 spines	5–9 spines	ca. 10 small spines and 1 larger	5–13 spines
telson			spine at outer corner
apex of telson	convex, with 15 spines	concave, with 5–10 spines	convex, with 12 spines	convex, with 8–21 spines
source	Nouvel (1957)	Murano (1997)	W.M. Tattersall (1921)	present study