Revision of the amphiamerican genus Mysidium Dana, 1852 (Crustacea: Mysida: Mysidae), with descriptions of two new species and the establishment of two new subgenera Author Wittmann, Karl J. C90E7BC4-A27A-4B41-93F3-6224D17795FF Department of Environmental Health, Medical University of Vienna, Kinderspitalgasse 15, A- 1090 Vienna, Austria. karl.wittmann@meduniwien.ac.at Author Wirtz, Peter A9870EB6-74E9-43C7-931E-A23AF2E981DA Centro de Ciências do Mar, Universidade do Algarve, Campus de Gambelas, PT- 8005 - 139, Faro, Portugal. peterwirtz2004@yahoo.com text European Journal of Taxonomy 2019 2019-02-05 495 1 48 journal article 10.5852/ejt.2019.495 db716632-f55b-4a04-b3cd-918eea1c92c9 2118-9773 2584868 65CC1141-E560-4979-97E5-F0701563C84B

Table 2. Diagnostic characters of the species of Mysidium Dana, 1852.

	M. gracile	M. integrum	M. cubanense	M. rubroculatum	M. triangulare	M. rickettsi 1, 2	M. pumae 2	M. columbiae	M. antillarum	M. iliffei 3
Table 2 (continued).
Original data and from 1) Harrison & Bowman 1987; 2) Ortiz et al. 2017a, 2017b; 3) Băcescu 1991; 1, 2, 3) data partly derived from figures.
Cornea diameter is (x)–times 1.7–3.2 length of terminal segment of antennular trunk in dorsal view		1.6–2.4	2.6–4.1	1.9–2.9	1.7–2.5	2.1	1.5	1.5–2.0	1.4–1.7	1.5
Total numbers of setae on and close to medio-terminal extension of male antennular trunk (Fig. 1B)	7–9	4–6	4–6	4–5	6–10	?	?	2–4	2–3	?
Its largest seta is (x)–times length 0.9–1.4		0.3–0.5	0.2–0.4	0.1–0.3	0.1–0.3	?	?	0.1–0.2	0.1	?
of mediodistal extension of male
antennular trunk
Appendix masculina is (x)–times 1.6–2.7		1.1–2.5	1.1–2.3	1.3–2.0	1.5–2.0	1.5	2.0–2.2	2.0–3.3	2.2–3.9	?
length of terminal segment of an-
tennular trunk
Antennal scale extends beyond	yes	yes	yes	yes	yes	yes	yes	yes	yes	no
antennular trunk
Antennal scale length is (x)–	4–6	4–5	4–6	4–5	5–7	4	6	7–8	7–11	6
times maximum width
Median segment of mandibular	yes	yes	yes	yes	yes	no	yes	yes	yes	?
palp with setae on outer margin
About evenly rounded (1), mod-	1	1	1	2	1	?	?	3	3	?
erately unevenly rounded (2)
or distally angular (3) hump on
outer face of terminal segment of
maxillula
Carpopropodus of third thoracic	3	3	3	3	3	3	2	3	3	3
endopod (n)–segmented
Basal segment is (x)–times total	0.5	0.5	0.5	0.5	0.4–0.5	0.6	0.8	0.5	0.5	0.4
length of carpopropodus of third
thoracic endopod
Numbers of serrated setae along	0	0	0	0	0	?	0	2–6	2–7	?
merus of third thoracic endopod
First pleopod rod-like (1) versus	1–2	2	2	1	2	1–2	1	1	1	?
bilobate (2)
Medial margin of third male	1	1	1	1	1	1	2	2	2	?
pleopod with widening (1) versus
projecting endite (2)
Sympod of fourth male pleopod:	0–1	0–1	0–1	0–1	0–1	0	0	2	0–1	?
without endite (0), with endite re-
duced to indistinct projection or
widening (1), with strong endite
(2)
Sympod of fourth male pleopod	0	0	0	0	0	0	0	3–6	3–7	?
with (n) setae on rostral face
Exopod of fourth male pleopod	4	4	4	4	4	4	4	3	3	?
(n)–segmented
Basal segment is (x)–times total 0.6–0.7		0.5–0.6	0.5–0.6	0.5–0.6	0.6	0.6	0.5	0.6–0.7	0.7	?
length of exopod of fourth male
pleopod
Penultimate segment of exopod	1	1	1	1	1	1	2	1	1	?
of fourth male pleopod with entire
(1) versus bifid (2) modified seta
Endopod of fourth male pleopod 0.1–0.2		0.1–0.2	0.1–0.2	0.1–0.2	0.1–0.2	= 0.1	= 0.2	0.3–0.5	0.3–0.4	?
is (x)–times length of sympod
Endopod of fourth male pleopod with (n) setae	5–8	5–7	5–7	4–6	5–7	7	5	7–10	5–12	?
Lateral margins of telson with spines (1) or laminae (2)	1	1	1	1	1	1	2	1	1	2
Numbers of spines or laminae on each lateral margin of telson	11–15	13–25	7–16	8–12	5–11	= 19	20–22	8–12	12–17	= 9–11
Telson with distinct apical cleft separating two broadly rounded, apical lobes (0) versus telson with shallow terminal indentation (1), traverse terminal margin (2), convex terminal margin (3), or ending in a triangular projection (4)	1	2–3	2–3	3–2	4	3	3	0	0	0
Terminal margin of telson with series of acutely pointed (1) versus blunt (2) laminae or spines	2	1–2	2–1	2	2	1–2	1	2	1	1
Numbers of laminae or spines on terminal margin of telson	15–21	12–20	12–20	11–18	21–24	= 24	23–25	22–30	19–23	= 17–22