A review of the Australian species of Ampithoe Leach, 1814 (Crustacea: Amphipoda: Ampithoidae) with descriptions of seventeen new species
Author
Peart, Rachael A.
text
Zootaxa
2007
2007-08-31
1566
1
1
95
https://biotaxa.org/Zootaxa/article/view/zootaxa.1566.1.1
journal article
10.11646/zootaxa.1566.1.1
11755334
5096061
08FAC923-666D-4A9C-B6DB-B5E823190187
Ampithoe katae
sp. nov.
(
Figs 26–29
)
Type material
.
Holotype
:
AM
P61842, male,
5 mm
,
Mangrove Beach
,
Lizard Island
,
Great Barrier Reef
, QLD,
14°40.99’S
145°27.63’E
,
19 Nov 1999
, 1 m,
on
Turbinaria
sp.
,
R
. Peart
.
Paratypes
:
AM
P61843, female,
6 mm
, type locality
;
AM
P61844,
6 specimens
, type locality
;
AM
P61845,
1 specimen
,
Coconut Beach
,
Lizard Island
,
Great Barrier Reef
,
14°40.81’S
145°28.41’E
,
17 Nov 1999
,
1.5 m
, on seagrass
,
R
.
Peart
;
AM
P61846,
2 specimens
,
Coconut Beach
,
Lizard Island
,
Great Barrier Reef
,
14°40.81’S
145°28.41’E
,
17 Nov 1999
,
1.5 m
,
on
Turbinaria
sp.
,
M. Huggett
&
K. Dempsey
;
AM
P61847,
1 specimen
,
Crystal Beach
,
Lizard Island
,
Great Barrier Reef
,
14°40.99’S
145°28.38’E
,
18 Nov 1999
,
3.2 m
,
on
Turbinaria
sp.
,
M. Huggett
&
R
.
Peart
;
AM
P61848,
4 specimens
,
Mangrove Beach
,
Lizard Island
,
Great Barrier Reef
,
14°40.99’S
145°27.63’E
,
19 Nov 1999
, 3 m, on green algae
,
R
.
Peart
;
AM
P61849,
6 specimens
,
Mangrove Beach
,
Lizard Island
,
Great Barrier Reef
,
14°40.99’S
145°27.63’E
,
19 Nov 1999
, 1 m,
on
Turbinaria
sp.
,
M. Huggett
;
AM
P61850,
2 specimens
, off
Casaurina Beach
,
Lizard Island
,
Great Barrier Reef
,
14°40.63’S
145°26.71’E
,
21 Nov 1999
, 1 m, on green algae,
M. Huggett
,
R
.
Peart
&
K. Dempsey
.
Diagnosis
. Antenna 2 slender, similar to antenna 1, not densely setose on ventral margin. Lower lip with lateral lobe longer than medial lobe. Maxilla 1 inner plate with three slender setae. Gnathopod 1 carpal lobe subacute; carpus shorter than propodus; palm convex, without midmedial tooth, without posterodistal tooth defining palm; dactylus subequal in length to palm. Gnathopod 2 without densely setose margins; basis posterodistal lobe large and rounded, with 1 robust seta; carpus shorter than propodus; palm acute, excavate, without a midmedial tooth, with a small subacute posterodistal tooth defining palm; with 1 defining robust seta; dactylus subequal in length to palm. Pereopod 3 basis narrow; merus narrow. Pereopods 5–7 simple. Pereopod 5 merus subrectangular. Uropod 3 peduncle with 4 distal robust setae, outer ramus subequal in length to inner ramus, without patch of small conical lateral denticles, without lateral setal fringe; inner ramus with 3 distal robust setae.
Telson
distally truncated, apical cusps small.
Description
. Based on
holotype
male,
5 mm
, AM P61842.
Head
as long as deep.
Antenna 1
longer than antenna 2; peduncular article 1 subequal to article 2 (0.98 x), article 2 longer than article 3 (2.56 x), article 3 shorter than article 1 (0.4 x); primary flagellum with 17–20 articles.
Antenna 2
peduncular article 4 subequal to article 5; flagellum 11 articulate.
Mandible
molar with 4–6 robust setae in the accessory setal row; palp stout, long, setose along posterior margin, article 1 shorter than article 2 (0.33 x), article 2 longer than article 3 (1.35 x), article 3 longer than article 1 (2.22 x).
Lower lip
mandibular lobe with curved margins, rounded apically.
Maxilla 1
palp with apical robust setae.
Maxilla 2
inner plate narrow, outer plate broader.
Maxilliped
outer plate with developed setation (robust setae large).
FIGURE 26.
Ampithoe katae
sp. nov.
, holotype, male, AM P61842, 5 mm. Paratype, female, AM P61843, 6 mm. Lizard Island, Queensland, Australia.
Pereon
.
Gnathopod 1
without densely setose margins; coxa larger than gnathopod 2 coxa, produced distoventrally, distoventral margin rounded, anterior margin concave, ventral margin, with a row of small setules; basis shorter than coxa, with sparse (sometimes plumose) slender setae, posterodistal lobe small and rounded, 1 slender seta; merus produced to form a small, subacute distoventral lobe, anterior margin with setae absent; carpus longer than merus, subtriangular, anterior margin with 2 robust setae and slender setae; propodus narrow (length 1.94 x width), subrectangular; palm with 1 defining robust seta; dactylus inner margin denticulate.
Gnathopod 2
coxa ventral margin with a row of small setules; basis subequal to coxa, with sparse slender setae; merus produced to form a short, subacute distoventral lobe, anterior margin with setae absent; carpus longer than merus, subtriangular, anterior margin with 2 robust setae and slender setae; propodus broad (length 1.31 x width), ovoid, produced into an anterodistally setose lobe; dactylus tapering evenly, acute, inner margin denticulate.
Pereopod 5
basis with marginal robust setae, without medial slender setae; distal articles slender; propodus not expanded distally, subrectangular, with 3 distal simple striated robust setae; dactylus strongly curved.
Pereopod 6
basis posterior margin rounded proximally, straight distally, with marginal robust setae, without medial slender setae; merus subrectangular; propodus slightly expanded distally, with 3 distal simple striated robust setae; dactylus strongly curved.
Pereopod 7
basis with marginal robust setae, without medial slender setae; propodus defined distally by 3–5 simple robust setae.
FIGURE 27.
Ampithoe katae
sp. nov.
, holotype, male, AM P61842, 5 mm. Paratype, female, AM P61843, 6 mm. Lizard Island, Queensland, Australia. Scales represent 0.5 mm for antennae 1–2 and 0.2 mm for mouthparts. Female antennae missing.
FIGURE 28.
Ampithoe katae
sp. nov.
, holotype, male, AM P61842, 5 mm. Paratype, female, AM P61843, 6 mm. Lizard Island, Queensland, Australia. Scales represent 0.2 mm for male and 0.5 mm for female.
FIGURE 29.
Ampithoe katae
sp. nov.
, holotype, male, AM P61842, 5 mm. Lizard Island, Queensland, Australia. Scales represent 0.2 mm. Pereopod 4 identical to pereopod 3.
Pleon
.
Epimeron 3
posteroventral corner broadly rounded.
Uropod 1
peduncle with 3–5 robust setae, with long setal fringe; inner ramus slightly longer than outer ramus, with 1 or 2 marginal robust setae, slender setae absent; outer ramus with more than 5 marginal robust setae, slender setae absent.
Uropod 2
peduncle with 1 or 2 robust setae, setal fringe absent; inner ramus slightly longer than outer ramus, with more than 5 marginal robust setae, slender setae absent; outer ramus with more than 5 marginal robust setae, slender setae absent.
Uropod 3
peduncle longer than broad (1.49 x width), short with respect to the rami length (1.92 x), with marginal robust setae absent, marginal slender setae absent, with 1 or 2distal slender setae; inner ramus with 1 or 2distal slender setae.
Telson
with oblique lateral and medial rows of slender setae.
Female.
(sexually dimorphic characters). Based on
paratype
, female,
6 mm
, AM P61843.
Gnathopod 1
subequal in size to gnathopod 2; coxa subequal in size to gnathopod 2 coxa; merus produced to form a short, rounded distoventral lobe; carpus anterior margin with 1 robust setae and slender setae.
Gnathopod 2
basis shorter than coxa, posterodistal lobe small and round, with 2 or 3 slender setae; propodus not produced anterodistally; palm entire, without tooth defining palm.
Etymology
. This species is named for Kate Dempsey who assisted in the collection of this species and others from Lizard Island.
Remarks
.
Ampithoe katae
sp. nov.
is most similar to
A. cookana
sp. nov.
Characters distinguishing
A. katae
and
A. cookana
are outlined under the account of the latter.
Habitat
.
Ampithoe katae
was collected from
Turbinaria
sp.
and green algae from
1–3.5 m
depth.
Distribution
. Lizard Island,
Queensland
,
Australia
.