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
Drummondia tridentata
sp. nov.
(
Figs 9
,
10
)
Type material.
HOLOTYPE
, male,
3.8 mm
,
MV
J14616
, south of
Point Hicks
,
Victoria
,
Australia
,
38°17.70'S
149°11.30'E
,
400 m
, coarse sand, gravel and mud, epibenthic sled,
24 July 1986
,
M.F. Gomon
et al.
,
RV
Franklin
, stn
SLOPE 40
.
PARATYPE
, male,
3.4 mm
,
MV
J14769
,
east of
Eden
,
New South Wales
,
Australia
,
37°7.30'S
150°20.20'E
to
37°5.30'S
150°21.80'E
,
520 m
, grey coarse shell, epibenthic sled,
20 July 1986
,
G.C.B. Poore
et al.
,
RV
Franklin
, stn
SLOPE 19
.
Etymology.
The specific name refers to the three dorsal spines on pereonite 5.
Diagnostic description.
Head
lateral cephalic lobe large, broadly rounded;
ventral margin subsigmoidal
.
Antenna 1
peduncular article 1 with posterodistal spine; accessory flagellum 2-articulate, article 1 short; flagellum with strong 1-field callynophore in male, [female not known].
Mandible
lacinia mobilis a simple robust seta
; left accessory setal row modified into lamina dentata, right accessory setal row present, not on raised setose ridge;
molar absent
; palp attached midway; palp article 2 broad, longer than article 3; article 3 with subparallel margins.
Maxilla 1
outer plate with 10 setal-teeth
in 7/3 arrangement, outer row setal-teeth with lateral and medial cusps; 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 2 × breadth
, posterior margin well developed, palm with produced corner, corner of palm with complex robust seta;
dactylus reaching to corner of palm
.
Gnathopod 2
palm minute, obtuse.
Pereonite 4
without dorsal spines.
Pereonite 5
with 3 acute dorsal spines
.
Pereopod 5
merus with weak posteroproximal shoulder.
Pereopod 6
basis with posteroventral lobe weakly produced; merus as broad as long, with posteroproximal shoulder.
Pereopod 7
basis subovate with posterior margin weakly dentate.
Epimeron 3
posterior margin without projections, posteroventral corner broadly rounded.
Uropod 3
biramous, inner ramus extending less than halfway along outer ramus.
Telson
shorter than broad, entire.
Remarks.
Drummondia tridentata
is the only species in the genus with a reduced number of setal-teeth on the outer plate of maxilla 1.
Distribution.
Bass Strait,
Australia
;
400–520 m
depth.