The Pachynidae fam. nov. (Crustacea: Amphipoda: Lysianassoidea) 3246
Lowry, J. K.
Stoddart, H. E.
Zootaxa
2012
2012-03-23
3246
1
1
69
6HZ8C
Lowry & Stoddart, 2012
Lowry & Stoddart
2012
[151,369,789,815]
Malacostraca
Pakynidae
Figorella
Animalia
Amphipoda
24
25
Arthropoda
species
formosa
sp. nov.
( Figs 16–18)
Type material. HOLOTYPE, female, 4.6 mm, MV J62417, 44km east of Nowra, New South Wales, Australia, Tasman Sea, 34°55.79'S 151°08.06'E, 429 m, muddy coarse shell, WHOIepibenthic sled, 22 October 1988, G.C.B. Poore et al., RV Franklin, stn SLOPE 56. PARATYPES: 1 female, 3.5 mm, MV J62418and 1 female, 4.5 mm, AMP.46669, same data as Holotype; 1 female, MV J17532, 33km south-south-west of Marlo, Bass Strait, Victoria, Australia, 38°04'S 148°25.7'E, 28 m, sand and shell, Smith-McIntyre grab, 12 August 1989, G. Parry, stn MSL-EG 16; 2 ovigerous females, 1 non-ovigerous female and 1 juvenile, MV J17533, 14km south-west of Marlo, Bass Strait, Victoria, Australia, 37°54'S 148°25.7'E, 26 m, sand and shell, Smith-McIntyre grab, 12 August 1989, G. Parry, stn MSL-EG 18.
Etymology.The specific name formosais taken from the Latin word for "beautiful." FIGURE 16. Figorella formosa sp. nov.Paratype, female, 3.5 mm, MV J62418, east of Nowra, New South Wales, Australia. Diagnostic description. Headlateral cephalic lobe large, narrowly rounded; ventral margin curved. Antenna 1peduncular article 1 without posterodistal spine; accessory flagellum 2-articulate, article 1 short; flagellum without callynophore in female, [male not known]. Mandiblelacinia mobilis a simple robust seta; lamina dentata absent; accessory setal row present, not on raised setose ridge; molar absent; palp attached slightly distally; palp article 2 broad, longer than article 3; article 3 with subparallel margins. Maxilla 1outer plate with 9 setal-teethin 5/4 arrangement, outer row setal-teeth with medial cusps; palpwell developed, 2-articulate, with 2 apical slender setae. Maxillipedinner plate small; outer plate large; palp 4-articulate, article 4 large. Gnathopod 1chelate; ischium smaller than propodus, not swollen posteroproximally; carpus extremely compressed; propoduslength about 1.8 × breadth, posterior margin well developed, posterodistal corner of palm attenuated, corner of palm with simple robust seta; dactylus reaching to corner of palm. Gnathopod 2palm minute, transverse. Pereonite 4without dorsal spines. Pereonite 5without dorsal spines. Pereopod 5merus without posteroproximal shoulder. Pereopod 6basis with posteroventral lobe weakly produced; meruslonger than broad, without posteroproximal shoulder. Pereopod 7basis subovate with posterior margin smooth. Oostegitesfrom gnathopod 2 to pereopod 5. Epimeron 3posterior margin without projections, posteroventral corner broadly rounded. Uropod 3biramous, inner ramus extending less than halfway along outer ramus. Telsonmuch shorter than broad,entire.
Remarks. Figorella formosais the only species in the genus which occurs in shallow water. The only other species of Figorellawith a 5/4 setal-tooth arrangement is F. corindon. These taxa differ in the length of the second article of the mandibular palp (shorter than article 3 in F. corindon, longer in F. formosa); in the length of the dactylus of gnathopod 2 (as long as the palm in F.formosa, over-reaching the palm in F. corindon); in the palm development (minute in F. formosa, large in F. corindon); pereopod 6 posteroventral lobe of basis (weakly produced in F. formosa, produced beyond the ischium in F. corindon); pereopod 6 merus posteroproximal shoulder (absent in F. formosa, present in F. corindon).
Distribution.South-eastern Australia; 26–429 mdepth.
J62417
1988-10-22
MV, WHOI, RV
G. C. B. Poore & Franklin
Australia
429
-34.929832
Nowra
11
151.13434
Tasman Sea
24
25
44, SLOPE 56
1
New South Wales
holotype
J62418
[619,1175,967,991]
MV
Australia
24
25
1
1
New South Wales
paratype
J62417
1988-10-22
AM
G. C. B. Poore & Franklin
Australia
429
-34.929832
Nowra
11
151.13434
Tasman Sea
24
25
1
1
New South Wales
paratype
J17532
1989-08-12
MV
G. Parry
Australia
28
-38.066666
Marlo
928
148.42833
Bass Strait
24
25
33
1
1
Victoria
paratype
J17533
1989-08-12
MV
G. Parry
Australia
26
-37.9
Marlo
928
148.42833
Bass Strait
24
25
14
1
1
Victoria
paratype