Comprehensive Description

provided by Smithsonian Contributions to Zoology
Nymphon rottnesti

MATERIAL EXAMINED.—One ovigerous female, holotype, I ovigerous female, 1 juvenile?, paratypes. West of Rottnest Island, 32°00′S, 115°16′E, CSIRO Sta. 225, 12 October 1963, beam trawl with fish and shells, 137–113 meters. WAM 70–3985, 3986, USNM 1 49236.

DESCRIPTION.—Trunk thin, fully segmented. Neck moderately long. Ovigers implanted anterior to, but against first lateral processes. Lateral processes separated by over twice their diameter, without tubercles or setae. Abdomen short, slightly longer than fourth lateral processes. Ocular tubercle low, rounded, capped by two tiny lateral papillae. Eyes large, slightly pigmented in alcohol. Proboscis cylindrical, slightly longer than neck.

Chelifores 2-segmented, scape with few scattered setae. Chela robust, slightly curved, little longer than scape. Fingers long, armed with 29–30 uniform teeth closely set on dactyl and immovable finger. Low hump over base of immovable finger, armed with thick tuft of setae. Fingers more than 1½ times length of palm. Fingers overlap when closed.

Palp segments 2 and 4 equal, third slightly shorter, fifth segment shortest, more than one-half length of second. Terminal 3 segments thickly setose ventrally, and scattered setae on all segments but the first.

Oviger with fourth segment swollen at one-third its length. Fifth segment longest, slightly longer than fourth, with several setae at tip. Distal segments increasingly shorter. Terminal segments with denticulate spines having the formula 16:13:10:11. Terminal claw with endal serrate edge having 9–10 minute teeth.

Legs long, thin, with sparse setae becoming more numerous distally. Second coxa almost three times length of first. Femur slightly inflated with eggs, three-fifths length of tibia 2. Tibia 1 is four-fifths length of tibia 2. Tarsus almost three-fourths length of propodus. Propodus very slightly curved, armed with row of uniform small spines on sole. Terminal claw almost one-half length of propodus, moderately curved. Auxiliary claws nine-tenths length of primary claw.

MEASUREMENTS (in mm).—Trunk length (ocular tubercle anterior to tip 4th lateral process), 2.41. Trunk width (across 2nd lateral processes), 1.31. Neck length, 1.20. Proboscis length, 1.36. Diameter between 2nd and 3rd lateral processes, 0.35. Third leg: Coxa 1, 0.52; coxa 2, 1.4; coxa 3, 0.58; femur, 2.88; tibia 1, 4.05; tibia 2, 4.92; tarsus, 0.7; propodus, 0.99; claw, 0.46.
license
cc-by-nc-sa-3.0
bibliographic citation
Child, C. Allan. 1975. "Pycnogonida of Western Australia." Smithsonian Contributions to Zoology. 1-28. https://doi.org/10.5479/si.00810282.190

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Nymphon flindersi

MATERIAL EXAMINED.—One female holotype. West of Garden Island, 32°13.3″S, 115°33.3″E, to 32°13.0″S, 115°31.1″E, coll. L. Marsh and M. Shepherd on F.R.V. Flinders, haul 1, 17–33 meters, 8 March 1972. WAM 73–76.

DESCRIPTION.—Trunk completely segmented. Lateral processes glabrous, separated by their own diameter or slightly more. Neck of medium length, thinning in diameter where it attaches to cephalic segment. Oviger implantation anterior to, but touching, first lateral processes. Ocular tubercle low, rounded, with 2 tiny lateral bumps. Eyes distinct, unpigmented in alcohol. Proboscis cylindrical, tapering toward truncated tip. Abdomen cylindrical, long, armed with 2 dorsal setae.

Chelifores large, well developed. Scape longer than proboscis, armed at midlength with single long dorsal and endal setae, several short lateral setae, and distally with a single long dorsal seta and 2 long endal setae. Longest setae are 1 to 1½ times diameter of scape. Chela with slightly globular palm, a ring of setae around insertion of fingers. Fingers almost 2 times length of palm, armed with 20 teeth on fixed finger, 19 on movable finger. Teeth homogeneous, becoming slightly longer distally on finger.

Second palp segment slightly longer than third, twice the fourth, and over twice the fifth. Setae sparse, increasing in number toward tip.

Fourth and fifth oviger segments relatively short, armed with few ectal setae. Fifth segment half length of fourth, with succeeding segments progressively shorter. Segments 7 through 10 with compound spines, increasing in length toward distal end of each segment, with the formula 8:7:7:8. Terminal claw shorter than tenth segment, armed with 7 ventral teeth. Larger compound spines with 5 denticulations per side.

Legs thin, sparsely setose. Coxa 1 with 2 long dorsolateral setae and 2 short lateral setae. Coxa 2 twice length of coxa 1, armed with 2 lateral setae, each longer than segment diameter. Coxa 3 slightly longer than coxa 1, armed with single ventrodistal seta. Femur armed at midlength with 2 long lateral setae, 1 dorsodistal seta of medium length, and few scattered lateral and ventral setae. Tibia 1 slightly longer than femur, armed with single long middorsal seta, a shorter dorsodistal seta, and few short lateral and ventral setae. Tibia 2 almost 1½ times length of femur, armed with few dorsal and ventral setae and a single dorsodistal seta.

Tarsus short, one-third propodal length. Propodus thin, slightly curved. Tarsus and propodus armed with row of ventral spines, without larger heel spines. Claw less than one-fourth length of propodus. Auxiliaries almost three-fourths length of main claw.

MEASUREMENTS (in mm).—Trunk length (insertion of scape to tip 4th lateral process), 2.81. Trunk width (across second lateral processes), 1.28. Proboscis length (ventral), 0.87. Abdomen length 0.62. Third leg: Coxa 1, 0.46; coxa 2, 0.96; coxa 3, 0.64; femur, 2.36; tibia 1, 2.56; tibia 2, 3.25; tarsus, 0.32; propodus, 1.10; claw, 0.27.
license
cc-by-nc-sa-3.0
bibliographic citation
Child, C. Allan. 1975. "Pycnogonida of Western Australia." Smithsonian Contributions to Zoology. 1-28. https://doi.org/10.5479/si.00810282.190