The Pachynidae fam. nov. (Crustacea: Amphipoda: Lysianassoidea) 3246
Author
Lowry, J. K.
Author
Stoddart, H. E.
text
Zootaxa
2012
2012-03-23
3246
1
1
69
https://biotaxa.org/Zootaxa/article/view/zootaxa.3246.1.1
journal article
10.11646/zootaxa.3246.1.1
11755334
5249007
Ekelofia eltanin
sp. nov.
(
Figs 11–13
)
Ekelofia eltanin
De Broyer
et al
., 2007: 157
(
nomen nudum
).
Type material.
HOLOTYPE
, male,
6.4 mm
,
USNM 1157176
,
Ross Sea
,
Southern Ocean
,
76°02.1'S
179°57.0'W
to
76°02.3'S
179°52.1'W
,
347–358 m
,
Menzies
trawl,
9 February 1972
,
USARP
Eltanin
cruise 51, stn 5762
.
PARATYPE
, female, 11.0 mm,
MV
J38223
,
Fram Bank
, north-west of
Cape Darnley
,
Antarctica
,
67°31.72'S
69°02.13'E
to
67°31.93'S
69°02.02'E
,
105–114 m
, epibenthic sled,
13 February 1993
,
M. O'Loughlin
, RSV
Aurora Australis
, stn AA93-130
.
FIGURE 11.
Ekelofia eltanin
sp. nov.
Holotype male, 6.4 mm, USNM 1157176, Ross Sea, Antarctica.
Diagnostic description.
Head
lateral cephalic lobe large, broadly rounded; ventral margin curved.
Antenna 1
peduncular article 1 with posterodistal spine; accessory flagellum 2-articulate, article 1 short; flagellum without callynophore in female, with strong 1-field callynophore in male.
Mandible
lacinia mobilis a simple robust seta
; lamina dentata absent; accessory setal row absent; molar absent; palp attached distally; palp article 2 broad, as long as article 3; article 3 not distally tapered, with anterior margin convex.
Maxilla 1
outer plate with 8 setal-teeth
in 5/3 arrangement, setal-teeth smooth; palp absent.
Maxilliped
inner plate small
; outer plate large; palp 4-articulate, article 4 large.
Gnathopod 1
chelate; ischium smaller than propodus, not swollen posteroproximally; carpus extremely compressed;
propodus
length about 1.6 × breadth,
with a vertical row of setae on medial face
, posterior margin well developed, palm with produced corner, corner of palm with simple robust seta; dactylus reaching to corner of palm.
Gnathopod 2
palm minute, obtuse.
Pereonite 4
without dorsal spines.
Pereonite 5
without dorsal spines.
Pereopod 5
merus with posteroproximal shoulder.
Pereopod 6
basis with posteroventral lobe produced beyond ischium; merus as broad as long, with posteroproximal shoulder.
Pereopod 7
basis subrectangular with posterior margin weakly dentate.
Epimeron 3
posterior margin without projections, posteroventral corner broadly rounded.
Uropod 3
biramous, inner ramus extending beyond article 1 of outer ramus.
Telson
as long as broad
, entire.
Etymology.
Named for the RV
Eltanin
, which made many fine collections of lysianassoid amphipods from the waters surrounding
Antarctica
; used as a noun in apposition.
Remarks.
Ekelofia eltanin
differs from
E. oculata
in: the number of setal-teeth on maxilla 1 outer plate; the presence of small inner plates on the maxilliped; the vertical row of medial setae on gnathopod 1 propodus; the more strongly defined posteroproximal shoulder on the merus of pereopods 5 and 6; and the relatively longer telson.
Distribution.
Ross Sea and Fram Bank,
Antarctica
;
105–358 m
depth.