Exploring the diversity of the deep sea-four new species of the amphipod genus Oedicerina described using morphological and molecular methods Author Jażdżewska, Anna M. Author Brandt, Angelika Author Arbizu, Pedro Martínez Author Vink, Annemiek text Zoological Journal of the Linnean Society 2022 2021-06-18 194 181 225 journal article 2868 10.1093/zoolinnean/zlab032 d7b7d634-c4a3-4e4d-b919-a502df02112f 0024-4082 5799308 01794248-7D36-42DC-B1FD-2A61FBEEB577L

Table 4. Morphological comparison of new species of Oedicerina including known species with information about their geographic and bathymetric distribution

Species/	Oedicerina claudei	Oedicerina denticulata	Oedicerina henrici sp.	Oedicerina ingolfi
character	sp. nov.	Hendrycks & Conlan, 2003	nov.	Stephensen, 1931
Head rostrum	Moderately deflexed,	Strongly deflexed, the angle	Strongly deflexed, the angle	Not deflexed, wide angle
(shape)	the angle between the	between the dorsal head	between the dorsal head	between the head dorsal
	dorsal head margin	margin and rostrum margin	margin and rostrum	margin and rostrum
	and rostrum margin	c. 90 °	margin 90 ° or less	margin
	a little more than 90 °
Head rostrum	As long as 1st article of	As long as 1st article of ped-	As long as 1st article of ped-	2/3 length of 1st article of
(length)	peduncle A1	uncle A1	uncle A1	peduncle A1
Md palp	2nd article, 4 setae; 3rd	2nd article, c. 11 setae; 3rd art-	2nd article, c. 10 setae; 3rd	2nd article, c. 12 setae; 3rd
	article, 2 medial, 2–3	icle, 6 medial, 3 apical setae	article, row of setae (30)	article, 9 medial, 3 apical
	apical setae			setae
Mxp	3rd palp article slightly	3rd palp article slightly pro-	3rd palp article not produced	3rd palp article slightly pro-
	produced along 4th	duced along 4th	along 4th	duced along 4th
Coxa 1	Subtriangular,	Subtriangular, anterodistal	Subtriangular, distinctly	Subtriangular, anterodistal
	anterodistal corner	corner bluntly rounded, ven-	produced anteriorly,	corner bluntly rounded,
	bluntly rounded, ven-	tral margin setose (curled	anterodistal corner nar-	ventral margin densely
	tral margin naked	setae)	rowly rounded, ventral	setose (long setae)
			margin naked
C1 width/depth	1:0.8	1:0.9	1:0.7	1:0.9–1
G1 dactylus	Longer than palm	As long as palm	Longer than palm	Just longer than palm
Coxa 2	Ventral margin naked	Ventral margin setose (curled	Ventral margin naked	Ventral margin densely
		setae)		setose
G2 dactylus	Longer than palm	Slightly shorter than palm	Longer than palm	As long as palm
Coxa 3	Ventral margin naked	Ventral margin setose	Ventral margin naked	Ventral margin setose
P3 dactylus	Longer than propodus	Longer than propodus (1:1.2)	Shorter than propodus	Longer than propodus
	(1:1.3)		(1:0.7)	(1:1.2)
C4 shape	Front margin strongy	Front margin almost straight	Front margin almost	Front margin slightly ex-
	extending distally,		straight	tending distally, coxa the
	coxa the widest at			widest at two-thirds of
	two-thirds of length			length
C4 lobe width/	1:0.9	1:0.7	1:0.5	1:0.8–1
depth
P4 dactylus	Longer than propodus	Longer than propodus (1:1.4)	Unknown	Longer than propodus
	(1:1.8)			(1:1.2–1.3)
Basis P7	Posterior margin	Ovate, slightly tapering dis-	Slightly tapering distally,	Posterior margin weakly
	convex, the widest	tally, posterior margin	posterior margin straight,	sinuous, smooth, sparse
	in the middle of	with long plumose setae,	crenutaled, naked,	long plumose setae,
	the length, smooth,	width:length = 1:1.4	width:length = 1:1.6	some short setae,
	with posterodistal			width:length = 1:1.5
	lobe nearly as
	long as ischium,
	width:length = 1:1.4
Pereonites	Smooth	Smooth	Pereonite 7 posteriorly dir-	Smooth
teeth			ected tooth
Pleonite 1	Smooth	Smooth	Posteriorly directed tooth	Posteriorly directed tooth
Pleonite 2	Smooth	Posteriorly directed tooth	Posteriorly directed tooth	Posteriorly directed tooth
Pleonite 3	Small, posteriorly dir-	Short upright process	Small, posteriorly directed	Small, upright tooth
	ected tooth		tooth