Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus Author Conlan, Kathleen E. 0000-0002-2263-7075 kconlan@nature.ca Author Desiderato, Andrea 0000-0002-2263-7075 kconlan@nature.ca Author Beermann, Jan 0000-0002-2263-7075 kconlan@nature.ca text Zootaxa 2021 2021-03-04 4939 1 1 191 journal article 7102 10.11646/zootaxa.4939.1.1 ee8e66ff-2f2c-47e2-978b-be52996d5b0f 1175-5326 4580622 F33F42D0-A139-4CE3-97D7-1314C12CF86B

TABLE 12. Key character states of locally distributed North Pacific species. Trans-hemispheric species (Table 10) may occur there as well. Xindicates the presence of the first character state described while — indicates the alternative character state given in italics. Sand Lindicate length.? indicates that the state is unknown. Character states apply to both sexes and all ages unless indicated otherwise.
Character	J. kimi	J. oclairi (Figs 62- 64)	J. borowskyae (Figs 65 -66)	J. staudei (Figs 67 - 77)	J. carltoni	J. shawi	J. myersi (Figs 85 - 87)
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14 Very large thumbed males may have greatly lengthened second antennae that lack the plumose setae that smaller males possess (Fig. 62) 15 In J. myersi, the setae are sparse, but can be interpreted to be numerous enough to comprise a fringe or not to comprise a fringe. Therefore, in the key to all species, J. myersi has been included twice so that it can be keyed out as either having a fringe or not.
Antenna 2, large subadult and thumbed male, posterior margin	—	X14	X	X	—	—	—
of article 5 and flagellum bearing plumose setae in addition to
the usual finely pectinate filter setae (e.g., Fig. 65) or without
plumose setae (e.g., Fig. 60)
Antenna 2, large subadult and adult female, posterior margin	?	X	X	X	—	—	—
of article 5 and flagellum bearing plumose setae in addition to
the usual finely pectinate filter setae (e.g., Fig. 65) or without
plumose setae (e.g., Fig. 81)
Mandibular palp, margin of article 2 with a fringe of setae	—	X	—	—	—	—	—
dorsally (Fig. 64) or without a fringe (e.g., Fig. 66)
Maxilla 1 with a seta or cluster of setae at the base of palp	—	—	—	—	—	—	—
article 1 (Fig. 101) or without seta(e) (e.g., Fig. 61)
Gnathopod 1, basis, anterolateral margin with a fringe of	—	—	—	—	—	—	—
spine-like setae (e.g., Fig. 88) or without spine-like setae (e.g.,
Fig. 83)
Gnathopod 1, carpus, with a seta or cluster of setae at the	X	X	X	—	X	X	X
anterodistal junction of the propodus which may be slightly
lateral or medial (e.g., Fig. 65) or without seta(e) (e.g., Fig.
67)
Gnathopod 1, carpus, seta(e) at the anterodistal junction of the	S	L	L	—	L	S	L
propodus moderately long (L, length Ẑ25% of anterior margin
length) (e.g., Fig. 81) or short (S, length <25% of anterior
margin length) (e.g., Fig. 83) or without seta(e) (Fig. 68)
Gnathopod 2, basis with a fringe of setae on the anterolateral	—	X	X	X	X	—	X15
margin (e.g., Fig. 67) or fringe absent (Fig. 83) (minute setae
may be present but are too small to be described as an obvious
fringe) (e.g., Fig. 60)
Gnathopod 2, basis, if setal fringe present, setae relatively	—	L	L	L	S	—	S
long (L, length Ẑ40% basis width) (e.g., Fig. 62) or short (S,
length mostly <40% basis width) (e.g., Fig. 28) or fringe ab-
sent (Fig. 83) (minute setae may be present but are too small
to be described as an obvious fringe) (e.g., Fig. 60)
Gnathopod 2, propodus, setae on the anteroproximal margin	S	S	S	L	S	S	S
long (L, setal length Ẑ maximal basis width) (Fig. 67) or short
to absent (S, setal length <maximal basis width) (e.g., Fig. 78,
Fig. 83)
Gnathopod 2, propodus, setae on the anterior margin plumose	—	X	—	—	—	—	—
(Fig. 62) or simple (e.g., Fig. 85)
Gnathopod 2, female propodus, palm concave, palmar angle	?	X	X	X	X	X	—
pronounced (acute, right angled or bulbous) (e.g., Fig. 83) or
palmar angle shallow, giving the palm a sinuous appearance
(e.g., Fig. 85)
Pereopods 5-7, propodus, anterior margin expanded for grasp-	—	—	—	—	—	—	—
ing (e.g., Fig. 95) or not expanded for grasping (e.g., Fig. 60)
Uropod 1, peduncular spinous process that extends ventrally	L	L	S	L	L	S	S
from the peduncle and underlies the rami, moderately long
(L, length = at least 25-50% the length of the longest ramus)
(e.g., Fig. 78) or very short (S, length ±10% of the length of
the longest ramus, in which case it may not be visible) (e.g.,
Fig. 65)
Uropod 3, inner ramus with 1-2 mid-dorsal spines in addition	—	—	—	—	—	—	—
to the usual spine at the tip (e.g., Fig. 42) or without dorsal
spines (e.g., Fig. 60)
Telson, tip with a seta or cluster of setae extending between	—	—	—	—	—	—	—
the third uropods (in addition to the usual upright setae at each
side) (Fig. 28) or without setae at the tip 12 (e.g., Fig. 65)