The tryphosine genera Photosella gen. nov. and Tryphosella Bonnier, 1893 (Crustacea: Amphipoda: Lysianassoidea: Lysianassidae: Tryphosinae) in Australian waters 2956
Author
Lowry, J. K.
Author
Stoddart, H. E.
text
Zootaxa
2011
2011-07-08
2956
1
1
76
https://biotaxa.org/Zootaxa/article/view/zootaxa.2956.1.1
journal article
10.11646/zootaxa.2956.1.1
11755334
5281859
Tryphosella orana
J.L.
Barnard, 1972
Tryphosella orana
J.L.
Barnard, 1972: 276
, figs 164, 165. —
Jones, 1986: 14
. —
Sergeev
et al.
, 1988: 102
(table 1). —
Barnard & Karaman, 1991: 537
. —
Lowry & Stoddart, 2003: 171
.
Type
locality.
Middleton Beach
,
Albany
,
Western Australia
, [approx.
35°00’S
117°52’E
], intertidal
.
Material examined.
Western Australia
:
9 specimens
,
AM
P.70530,
Vancouver Peninsular
, near
Mistaken Island
,
King George Sound
,
35°04'S
117°56'E
,
6 m
, sea grass with bryozoan or fine pink alga,
13 December 1983
,
R
.
T
.
Springthorpe
, stn WA-120
;
1 male
,
AM
P.70531, off
Possession Point
,
King George Sound
,
35°02.5'S
117°55'E
,
10 m
, sand and detritus from bases of sea grass,
14 December 1983
,
R
.
T
.
Springthorpe
&
J.K. Lowry
, stn WA-131; 2 ovigerous females,
AM
P.70532, 2 km south-east of
South Point
,
Two Peoples Bay
,
34°58'S
118°12'E
,
14 m
,
Caulerpa
bases and sand from fine sand bottom,
16 December 1983
,
J.K. Lowry
, stn WA-178
.
Diagnostic description
.
Head
lateral cephalic lobe rounded, apically rounded; eyes lageniform (but fading in alcohol).
Antenna 1
peduncular articles 1 and 2 without anterodistal lobe; accessory flagellum not forming cap, terminal article not offset; flagellum with strong 2-field callynophore, robust setae absent from proximal articles; calceoli absent.
Antenna 2
peduncular article 3 short; articles 4 and 5 not enlarged; flagellum short, calceoli absent.
Epistome/Upper lip
separate; epistome produced beyond upper lip, broadly rounded; upper lip slightly produced, rounded apically
Mandible
molar with asymmetrically reduced column, proximally setose, distally triturating; article 3 with proximal A3-seta; palp distal margin with apical robust setae.
Maxilliped
outer plate with 2 short apical robust setae.
Gnathopod 1
subchelate;
coxa small (length 1.1 x breadth), subtriangular, tapering distally
;
basis sparsely setose along anterior margin
; ischium short; carpus long, subequal in length to propodus, without posterior lobe; propodus small, margins subparallel, palm slightly acute, entire, straight.
Gnathopod 2
propodus palm slightly obtuse
.
Pereopod 4
coxa without distinct lateral ridge, with a well-developed posteroventral lobe.
Pereopod 5
coxa without distinct lateral ridge, without umbo; basis about as long as broad, not posteroproximally excavate, posterior margin weakly serrate.
Pereopod 7
basis posterodistally produced less than halfway along merus, not posterodistally excavate.
Pleonites 1–3
without mid-dorsal carina, not produced dorsodistally.
Epimeron 3
posterior margin smooth,
posteroventral corner narrowly rounded
.
Urosomite 1
not projecting over urosomite 2, with anterodorsal notch and slightly rounded boss.
Uropods 1 and 2
outer rami with distal stout striated robust setae.
Uropod 2
inner ramus without constriction.
Uropod 3
peduncle without dorsolateral flange, with 2 short apicomedial robust setae; inner and outer rami well developed, outer ramus article 2 short, without plumose setae on rami.
Telson
deeply cleft, with dorsal robust setae, with 1 apical robust seta on each lobe.
Male (sexually dimorphic characters).
Head
lateral cephalic lobe a semidome.
Antenna 1
calceoli small.
Antenna 2
peduncular articles 4 and 5 enlarged; flagellum long, calceoli present.
Urosomite 1
with anterodorsal notch and rounded boss.
Uropod 3
with 1 short apicomedial robust seta; with plumose setae on both rami.
Remarks.
Tryphosella orana
is one of the group of six Australian species with stout striated robust setae on the outer rami of uropods 1 and 2 (see Remarks under
T. fortescue
).
Tryphosella orana
is most similar to
T. tathra
– see Remarks under that species.
Distribution.
Southern
Western Australia
, intertidal to
14 m
depth.