New genera, species and records of Maeridae from Australian Waters: Austromaera, Ceradocus, Glossomaera, Hamimaera, Huonella gen. nov., Linguimaera and Maeraceterus gen. nov. (Crustacea: Amphipoda)
Author
Hughes, Lauren E.
text
Zootaxa
2016
4115
1
1
81
journal article
38493
10.11646/zootaxa.4115.1.1
1cfd5ba9-621f-4abd-97bc-20beb462e2fd
1175-5326
255539
C0CF41A3-40FB-428E-8933-02115AB0F6E3
Ceradocus baudini
sp. nov.
(
Figs 2–6
)
Type
material.
Western
Australia
:
Holotype
female,
6 mm
, dissected, 2 slides, AM P.92241,
Beacon Island
,
Abrolhos Islands
(
28°25′30″S
113°47′00″E
),
24 m
, coral rubble covered in coralline algae, half way up reef front,
23 May 1992
, coll.
P.A. Hutchings
(WA 501)
;
paratype
male,
6 mm
, (left gnathopod the larger), AM P.79472, Beacon
Island
,
Abrolhos Islands
(
28°25′30″S
113°47′00″E
),
24 m
, coral rubble covered in coralline algae, half way up reef front,
23 May 1992
, coll.
P.A. Hutchings
(WA 501).
Additional material examined.
Western
Australia
:
1 female
,
6 mm
, dissected, 4 slides,
WAM
C59000,
Adele Island
,
The Kimberley
,
Western
Australia
(
15°31′40″S
123°12′00″E
)
13 October 2009
, coll.
Andrew Hosie
(01/ K09-T1)
;
2 specimens
,
WAM
C43732, Adele
Island
,
The Kimberley
(
15°31′40″S
123°12′00″E
) (01/K09-T1)
;
4 males
, AM P. 97862, northern side of Malus
Island
,
Dampier Archipelago
(
20°30.056′S
116°40.579′E
),
8.7 m
, mixed sponges,
27 August 1999
, coll.
R.A. Peart
(WA 655)
;
1 male
, AM P. 97863, east side of West Lewis
Island
,
Dampier Archipelago
(
20°34.655′S
116°39.721′E
),
5 m
, from under rocks,
4 September 1999
, coll.
R.A. Peart
(WA 709); 1 dissected specimen, 4 slides,
NMV
J46911
, north side of
Cape
Riche (
34°37′00″S
118°47′00″E
),
6 m
,
14 April 1984
(SWA-47)
;
1 specimen
,
NMV
J56984
, north side of
Cape
Riche (
34°37′00″S
118°47′00″E
),
6 m
,
14 April 1984
(SWA-47).
Northern
Territory
:
1 specimen
,
5.8 mm
, dissected in part, 1 slide, AM P.78241, patch reef on north side of New Year
Island
(
10°54′S
133°02′E
),
10 m
, coral rubble,
14 October 1982
, coll.
J.K. Lowry
(NT 8).
Queensland
: 1 a female,
5.5 mm
, dissected, 4 slides, AM P.92239, northwest corner of Goodes
Island
,
Torres Strait
(
10°33′35″S
142°09′09″E
),
7.8 m
, dead coral cf
Tubipora musica
,
29 September 2006
, coll.
M. Capa
and
L.E. Hughes
(QLD 1874)
;
3 specimens
, AM P.75599, northwest corner of Goodes
Island
,
Torres Strait
(
10°33′35″S
142°09′09″E
),
7.8 m
, dead coral cf
Tubipora musica
,
29 September 2006
, coll.
M. Capa
and
L.E. Hughes
(QLD 1874).
South Australia
:
1 male
,
9.2 mm
, dissected, 4 slides,
SAMA
C6452, west of
Aldinga
,
Gulf of St Vincent
(
33°16′00″S
138°26′59″E
),
38–41 m
, in prawn trawl,
8 May 1987
, coll.
K.L. Gowlett-Homes
and
S. Corigliano
,
FV
Rivoli Queen
;
1 female
,
8.4 mm
, dissected, 4 slides,
SAMA
C8499, west of
Aldinga
,
Gulf
of St Vincent (
33°16′00″S
138°26′59″E
),
38–41 m
, in prawn trawl,
8 May 1987
, coll.
K.L. Gowlett-Homes
and
S. Corigliano
,
FV
Rivoli Queen
;
4 female
and juvenile specimens,
SAMA
C8500, west of
Aldinga
,
Gulf
of St Vincent (
33°16′00″S
138°26′59″E
),
38–41 m
, in prawn trawl,
8 May 1987
, coll.
K.L. Gowlett-Homes
and
S. Corigliano
,
FV
Rivoli Queen
.
FIGURE 2.
Ceradocus baudini
sp. nov.
female, habitus, 6.0 mm, AM P.92241, Beacon Island, Abrolhos Islands, Western Australia.
Type
locality.
Beacon Island
,
Abrolhos Islands
,
Western
Australia
(
28°25′30″S
113°47′00″E
).
Etymology.
Name in honour of the French Captain Nicolas Baudin, who named the
type
locality and was a notable collector of natural history specimens.
Description.
Based on
holotype
female,
6 mm
, AM P.92241.
Head.
Eyes
ovate to round; lateral cephalic lobe broad, apically rounded, anteroventral margin with notch/ slit, anteroventral corner acute.
Antenna 1
longer than antenna 2; peduncular article 1 shorter than article 2, with 1 robust seta on posterior margin; peduncular article 2 longer than article 3; flagellum articles as long as broad, or broader than long, with 27 articles; accessory flagellum short, significantly less than half length of primary flagellum, with 5 articles.
Antenna 2
peduncular article 4 longer than article 5; flagellum with 8 articles.
Mandible
(based on WAM C59000) accessory setal row, well developed with 7 setae; palp well developed, article 1 length subequal width, shorter than article 2, inner margin distally produced acute; article 2 much longer than article 3, with a many slender setae; article 3 reduced, 1.8 × as long as broad, subequal to article 1, with many slender setae.
Lower lip
without apical ducts, mandibular lobes apically rounded.
Maxilla 1
inner plate with 6 slender setae.
Pereon.
Gnathopod 1
coxa anterior margin concave, anteroventral corner produced, acute, posteroventral corner with notch; merus with posteroventral corner round; carpus length 2 × width, 0.9 × propodus length, margins lined with long setae, long setae covering medial surface; propodus subquadrate, medial surface setal comb absent, palm subacute, weakly convex, entire, lined with robust setae, defined by posterodistal corner with robust setae extending beyond palm; dactylus closing along palm, posterior margin lined with setules, unguis present.
Gnathopod 2
asymmetrical, subchelate;
larger gnathopod
coxa posteroventral corner without notch; basis slightly expanded, anterodistal corner subquadrate; merus with subquadrate posteroventral corner; carpus compressed, length 0.8 × width, margins with few slender setae;
propodus
rectilinear, length 1.6 × width, margin without setae, palm angle subacute, distal shelf with 3 pairs of robust setae,
palm margin teeth with apical robust setae, with 1 subquadrate and 1 subacute tooth and defined by posteroventral corner with tooth and 1 robust seta; dactylus closing along palm
, unguis present.
Gnathopod 2
smaller gnathopod basis slightly expanded, anterodistal corner subquadrate; merus with acute posteroventral corner; carpus subtriangular, length 1.7 × width, posterior margin with long slender setae; propodus subovate to rectilinear, margins with rows of long slender setae, palm angle subacute, margin smooth, lined with robust setae defined by posteroventral corner with tooth and long robust seta; dactylus closing along and reaching end of palm, unguis present.
FIGURE 3.
Ceradocus baudini
sp. nov.
female, 6.0 mm, AM P.92241, Beacon Island, Abrolhos Islands, Western Australia, scales 0.1 mm.
FIGURE 4.
Ceradocus baudini
sp. nov.
female, 6.0 mm, AM P.92241, Beacon Island, Abrolhos Islands, Western Australia, scales 0.1 mm.
Pereopods 5–7
slender distally; basis posterior margin straight, weakly serrate; merus, carpus and propodus not broadened; dactylus unguis simple.
Pleon.
Pleonites 1–3
dorsally serrate.
Epimeron 1
posteroventral corner with acute tooth.
Epimeron 2
ventral and posterior margin distally serrate, posteroventral corner with acute tooth.
Epimeron 3
ventral and posterior margin serrate distally, posteroventral corner with acute tooth.
Urosomites 1–2
strongly serrate.
Uropod 1
peduncle with 1 basofacial seta, peduncle length 1.1 × outer ramus; inner ramus subequal to outer ramus.
Uropod 2
peduncle length 1.1 × outer ramus; inner ramus longer than outer ramus.
Uropod 3
(based on WAM C59000) based on rami subequal in length, longer than peduncle, length 4 × width, distally truncated, with lateral and apical long and short robust setae.
Telson
deeply cleft, length subequal to width, lobes divergent, tapering distally, with single apically acute cusps, each lobe
with 1 short and 1 long apical robust setae, without marginal or lateral robust setae
.
Variation.
The asymmetrical gnathopod may be left or right dominant. The
telson
has two long robust setae in material from Abrolhos
Island
, while other South Australian, north
Western
Australia
,
Northern
Territory
and
Queensland
specimens have two long and 1 short robust setae. In AM P.97862 (WA 655), a
5.8 mm
male had the form with large 2nd last tooth on male gnathopod 2 (figs 4, 5), and a 6.0 mm specimen had the terminal male gnathopod form where the 2nd last palm tooth is reduced (fig. 2). The specimens from cooler temperate waters in
South
Australia
have a much larger body size,
9.2 mm
, compared to material from all other locations ~
5 mm
.
FIGURE 5.
Ceradocus baudini
sp. nov.
, male habitus 6.0 mm, WAM C59000, Adele Island, The Kimberley, Western Australia, scales 0.1 mm.
Remarks.
The distribution of
C. baudini
sp. nov.
spans tropical
Australia
and ranges into temperate southern
Australia
. The gnathopod 2 propodus palm with a distal shelf, two palmar teeth and subacute palm defining tooth (4 teeth in total) identifies
Ceradocus baudini
sp. nov.
and
C. ramsayi
(Haswell, 1880b)
from other
Ceradocus
species. In
Ceradocus baudini
sp. nov.
the dominant gnathopod 2 propodus palm angle is subacute while in
C. ramsayi
the palm is transverse.
Distribution.
Australia
.
South
Australia
:
Gulf
of St Vincent.
Western
Australia
: Abrohlos Islands, Adele
Island
, The Kimberley; Malus
Island
, West Lewis
Island
, Dampier Archipelago.
Northern
Territory
: New Year
Island
.
Queensland
: Torres Strait (current study).