Diptychus gracilimanus Henderson, 1885: 420
Uroptychus gracilimanus
Henderson, 1888: 181
Tirmizi, 1964: 392
Baba, 1969: 45
Davie, 2002: 31
The Chirostylidae of southern Australia (Crustacea: Decapoda: Anomura)
Ahyong, Shane T.
Poore, Gary C. B.
Zootaxa
2004
2004-02-18
436
1
1
88
efe2c0bf-8296-4473-8cd6-58c55a904870
(Henderson, 1885)
Henderson
1885
[264,808,1284,1310]
Malacostraca
Chirostylidae
Uroptychus
Animalia
Decapoda
39
40
Arthropoda
species
gracilimanus
Diptychus gracilimanus Henderson, 1885: 420[ typelocality: off Port Jackson, New South Wales, Australia]. Uroptychus gracilimanus.– Henderson, 1888: 181, pl. 21: fig. 5.– Tirmizi, 1964: 392, figs. 6–9.– Baba, 1969: 45, figs. 3,4; 1988: 19, 35–36; 1990: 924, 941–943, figs. 8a, b.– Davie, 2002: 31.
Material examined. NEW SOUTH WALES: AMP64924, 4 males( 7.8–12.1 mm), 8 females( 7.9–11.9 mm), off Newcastle, 1040–1075 m, NZOI Y222, RV Tangaroa, R. Sprinthorpe & W. Ponder, 9 Oct 1982; AMP67833, 2 males( 10.9–12.1 mm), 6 females( 9.3–11.4 mm), off Newcastle, 32°49.3’S, 152°49.1’E, 951–1150 m, NZOI U223, RV Tangaroa, R. Sprinthorpe & W. Ponder, 10 Oct 1982; AMP31511, 1 female( 7.5 mm), E of Norah Head, 33°26’S, 152°06’E, 458–476 m, K802006, 9 Dec 1980; AMP65824, 1 male( 8.3 mm), 1 female( 8.1 mm), E of Broken Bay, 33°31–34’S, 152°02–04’E, 915 m, K772307, 6 Dec 1977; AMP65825, 1 female( 9.4 mm), E of Port Jackson, 33°52’S, 151°50’E, 778 m, K720715, 7 Dec 1972; NMV J52353(part), 2 females( 9.8–11.6 mm), 56 kmENE of Nowra, 34°43.95–43.98’S, 151°14.74–14.28’E, 1009– 817 m, SLOPE 58, 3.5 mbeam trawl, G. Poore et al., 22 Oct 1988; AMP65627, 1 female( 11.8 mm), E of Shoalhaven Bight, 34°54–56’S, 151°15–17’E, 1115–1152 m, K831802, 30 Nov 1983; NMV J17055(part), 1 male( 12.2 mm), 2 ovigerous females ( 11.5–12.2 mm), off Nowra, 35°00.00’S, 151°16.30’E, 1100 m, SLOPE 9, 5m otter trawl, M. Gomon et al., 15 Jul 1986; AMP67837, 2 males(7.5–12.0 mm), 1 ovigerous female (11.0 mm), E of Ulladulla, 35°27’S, 150°55’E, 987–1025 m, K831402, 25 Oct 1983. VICTORIA: NMV J17060, 1 male( 10.7 mm), 1 ovigerous female ( 9.9 mm), 63 kmS of Point Hicks, Bass Strait, 38°22.66’S, 149°18.41’E, 1073 m, 3.5 mbeam trawl, SLOPE 68, G. Poore et al., 25 Oct 1988; NMV J52350, 1 male( 9.5 mm), 2 ovigerous females (8.0– 9.2 mm), 63 kmS of Point Hicks, Bass Strait, 38°22.66’S, 149°18.41’E, 1073 m, 3.5 mbeam trawl, SLOPE 68, G. Poore et al., 25 Oct 1988. TASMANIA: NMV J52351, 1 male( 8.1 mm), 48 kmENE of Cape Tourville, SLOPE 81, G. Poore et al.; SAM, 1 ovigerous female (11.0 mm), 67 kmSSE of Southeast Cape, 44°11.9’S, 147°04.7’E, 1025–1116 m, trawl, FV Corvina, K. GowlettHolmes, 8 Feb 1992; AMP64988, 1 female( 11.1 mm), off St. Patricks Head, 41°37.3–39.8’S, 148°41.4– 40.5’E, 940–990 m, S05/87/06, K. Graham, 11 Jul 1987.
Diagnosis.Carapace excluding rostrum distinctly longer than broad; lateral margins subparallel or slightly divergent, unarmed; with small anterolateral spine; posterior quarter with low but distinct ridge; outer orbital angle produced to small spine; dorsum smooth and unarmed, except for pair of small epigastric spines or tubercles. Rostrum sharply triangular. Sternite 3 strongly depressed, anterior margin shallowly emarginate, with narrow Ushaped notch and pair of median spines. Antennal basal segment with distinct outer spine; ultimate and penultimate segments unarmed. Antennal scale extending to or beyond midlength but not beyond distal twothirds of ultimate peduncle segment. Cheliped merus with tubercles on inner proximal margin. Pereopods 2–4 propodi not broadened distally, with 6–8 movable spines on lower distal margin, none paired; dactyli flexor margin with 9–11 obliquely directed spines. Pereopod 4 distinctly shorter than pereopod 3; length of pereopod 4 merus 0.7–0.8 that of pereopod 3.
Description. Carapace: Length (excluding rostrum) distinctly greater than breadth. Lateral margins subparallel or slightly divergent, unarmed except for small tubercle at base of cervical groove in larger specimens; with small, anteriorly directed anterolateral spine; posterior quarter with low but distinct ridge. Rostrum sharply triangular, exceeding onethird length of remaining carapace, margins unarmed. Outer orbital angle produced to small spine extending slightly beyond level of anterolateral spines. Dorsum smooth and unarmed, except for pair of small epigastric spines or tubercles. Pterygostomian flap with small anterior spine. Sternum: Plastron about as broad as long, widening posteriorly. Sternite 3 (at base of maxilliped 3) strongly depressed, anterior margin shallowly emarginate, with narrow Ushaped notch and pair of median spines; outer lobes of emargination obtusely angled with short outer projection. Sternite 4 (at base of pereopod 1) with anterolateral tooth not extending anteriorly beyond level of base of median notch; margins tuberculate, irregular; surface with transverse row of tubercles. Abdomen: Segments glabrous. Telson about twothirds as long as broad; distal portion posteriorly emarginate, about twice length of proximal portion. Eye: Cornea moderately dilated, subequal to length of peduncle; reaching to distal quarter of rostrum. Antenna: Basal segment with distinct outer spine. Peduncle extending to distal third of rostrum. Flagellum about twice as long as peduncle. Ultimate and penultimate segments unarmed; ultimate segment about 2 times length of penultimate segment. Antennal scale wider than opposite peduncular segments, extending to or beyond midlength but not beyond distal twothirds of ultimate peduncle segment. Maxilliped 3: Dactylus, propodus, carpus and merus unarmed. Crista dentata distinctly serrate on proximal twothirds of ischium, extending onto basis. Pereopod 1 (cheliped): Slender, cylindrical, 3.5–4.0 times carapace length; chelae of females and juveniles usually more slender than in adult males; segments glabrous dorsally and sparsely setose distally. Propodus palm about 3 times as long as high, about twice as long as pollex. Fingers crossing, occlusal margins finely dentate and each; occlusal margin of dactylus with obtuse process proximally; occlusal margin of pollex with low prominence at about midlength. Carpus longer than merus and as long as propodal palm; glabrous. Merus with distinct tubercles on inner proximal margin, less pronounced in juveniles. Ischium with triangular spine on outer margin. Pereopods 2–4: Sparsely setose. Meri and carpi with smooth margins. Propodi not broadened distally; with smooth extensor margin; with 6–8 movable spines on distal flexor margin, none paired. Dactyli setose marginally, with 9–11 fixed, obliquely directed spines on flexor margin. Pereopods 2–3 carpus about 0.5 merus length, about 0.6 propodus length. Pereopod 2 slightly longer than pereopod 3. Pereopod 4 distinctly shorter than pereopod 3; length of pereopod 4 merus 0.7–0.8 that of pereopod 3. Ovum: 1.8 mmdiameter.
Remarks. Uroptychus gracilimanus( Henderson, 1885)is most similar to U. australis( Henderson, 1885)and U. comptus Baba, 1988. Characters distinguishing the three species are outlined under the account of U. australis. Uroptychus gracilimanusalso resembles U. nigricapillisin general habitus including the armature and proportions of the antennal peduncle, antennal scale, walking legs and sternal plastron. Uroptychus nigricapillisis readily distinguished from U. gracilimanus, however, by the presence of several small spines along the lateral carapace margins. FIGURE 10. Uroptychus gracilimanus( Henderson, 1885), female, 9.4 mm, off Port Jackson, AM P65825. A, dorsum. B, anterior carapace, right lateral. C, cheliped, proximal right ventral. D, telson. E, sternum. F, maxilliped 3, right lateral. G, crista dentata, right. H, antenna, right ventral. A–C, F = 2 mm, D–E, G–H = 1 mm. The slenderness of the chelae of U. gracilimanus, the basis for its specific name, is sexually dimorphic as in U. australis, being more robust in adult males. The tubercles on the inner proximal margin of the chelae are also most distinct in adult males. Although not mentioned by Henderson (1885, 1888), a pair of small epigastric spines or tubercles is present on the carapace in U. gracilimanus. Uroptychus gracilimanushas not been adequately described or figured. Therefore, the species is redescribed above and a specimen from the typelocality, off Port Jackson (AM P65825), is illustrated in Figure 10.
Distribution.East Africa, Indonesia, the East ChinaSea, Japan, eastern Australiaand now Tasmaniaat depths of 421–1668 m.
3337128361
[529,768,1358,1381]
Australia
Port Jackson
39
40
1
New South Wales
3337128329
P64924
AM
NEW SOUTH WALES
39
40
12
8
4
New South Wales
3337128371
1982-10-09
NZOI, RV
1058
Newcastle
39
40
Y222
1
Newcastle upon Tyne
3337128318
P67833
AM
39
40
8
6
2
Newcastle upon Tyne
3337128353
1982-10-10
NZOI, RV
1050
-32.821667
Newcastle
120
152.81833
39
40
U223
1
Newcastle upon Tyne
3337128342
P31511
1980-12-09
AM
467
-33.433334
Norah Head
1205
152.1
39
40
1
1
Newcastle upon Tyne
3337128397
P65824
1977-12-06
AM
915
Broken Bay
39
40
2
1
1
Newcastle upon Tyne
3337128314
P65825
1972-12-07
AM
778
-33.866665
Port Jackson
1202
151.83333
39
40
1
1
Newcastle upon Tyne
3337128328
J52353
1988-10-22
NMV
817
40
41
Poore
39
40
SLOPE 58
2
2
Newcastle upon Tyne
3337128357
P65627
1983-11-30
AM
1134
Shoalhaven Bight
40
41
1
1
Newcastle upon Tyne
3337128395
J17055
1986-07-15
NMV
M. Gomon
1100
-35.0
Nowra
11
151.27167
40
41
SLOPE 9, 5
1
1
Newcastle upon Tyne
3337128344
P67837
1983-10-25
AM
1006
-35.45
Ulladulla
1193
150.91667
40
41
2
2
Newcastle upon Tyne
3337128381
J17060
NMV
0
-38.377666
Bass Strait
11
149.30684
40
41
1
1
Victoria
3337128346
1988-10-25
SLOPE
40
41
SLOPE 68
1
VICTORIA
3337128409
J52350
NMV
0
-38.377666
Bass Strait
11
149.30684
40
41
1
1
VICTORIA
3337128432
[440,910,724,750]
1988-10-25
SLOPE
40
41
SLOPE 68
1
VICTORIA
3337128366
J52351
[312,1221,764,790]
NMV
Cape Tourville
40
41
1
1
Tasmania
3337128359
1992-02-08
SAM
G. Poore
1071
-44.198334
Southeast Cape
113
147.07834
40
41
SLOPE 81
1
TASMANIA
3337128422
P64988
1987-07-11
AM
K. Graham
965
St. Patricks Head
40
41
1
1
TASMANIA