Uroptychus raymondi Baba, 2000

Baba, Keiji, 2018, Chirostylidae of the Western and Central Pacific: Uroptychus and a new genus (Crustacea: Decapoda: Anomura), Tropical Deep-Sea Benthos (Mémoires du Muséum national d'Histoire naturelle 212), pp. 1-612 : 443-444

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Uroptychus raymondi Baba, 2000


Uroptychus raymondi Baba, 2000

Uroptychus raymondi Baba, 2000: 250 , fig. 3. — Ahyong & Poore 2004: 73 View Cited Treatment , fig. 22.

TYPE MATERIAL — Holotype: Australia, off St. Helens , Tasmania, 645 m, ov. female ( TM G3517 ). [not examined].

MATERIAL EXAMINED — New Caledonia, Norfolk Ridge. NORFOLK 2 Stn DW2047, 23°43.04’S, 168°01.92’E, 759-807 m, 23.X.2003, 1 ♂ 6.7 mm (MNHN-IU-2014-16929) .

DISTRIBUTION„ Victoria, Tasmania, and now Norfolk Ridge; 644- 807 m.

DIAGNOSIS„ Large species. Carapace broader than long (0.8 × as long as broad), broadest at midlength; greatest breadth 1.7 × distance between anterolateral spines. Dorsal surface granulose and setose, with distinct depression between gastric and cardiac regions and between gastric and anterior branchial regions. Lateral margins with strong spine at midlength, followed by distinct ridge bearing a few low, posteriorly diminishing crenulations; anterolateral spine strong, overreaching lateral orbital angle. Rostrum sharp triangular, with interior angle of 25°, more than half as long as carapace, breadth more than half carapace breadth at posterior carapace margin, surface slightly excavated longitudinally. Lateral limit of orbit angular, without distinct spine. Pterygostomian flap anteriorly angular, produced to small spine. Excavated sternum with convex anterior margin; sternal plastron slightly shorter than broad, lateral extremities gently divergent posteriorly; sternite 3 well depressed, anterior margin representing broad V-shape, with U-shaped median sinus separating obsolescent submedian spines; sternite 4 with anterolateral margin anteriorly angular, about as long as posterolateral margin; anterolateral margin of sternite 5 slightly convexly divergent posteriorly, length subequal to that of posterolateral margin of sternite 4. Abdominal somite 1 antero-posteriorly well convex but not sharply ridged; somite 2 tergite 2.6 × broader than long, pleuron anterolaterally bluntly angular, posterolaterally blunt; pleuron of somite 3 with bluntly angular lateral terminus. Telson half as long as broad; posterior plate 1.5 × longer than anterior plate, posterior margin moderately emarginate. Ultimate article of antennule 3.0 × longer than high. Antennal article 2 with small lateral spine; antennal scale terminating in midlength of article 5; distal 2 articles each with obsolescent distal spine; article 5 1.5 × length of article 4, breadth 0.6 × height of ultimate article of antennule, flagellum of 16 segments slightly falling short of distal end of P 1 merus. Mxp1 with bases broadly separated. Mxp3 basis with obsolescent denticles on mesial ridge; ischium with distally diminishing denticles on crista dentata, flexor margin distally rounded; merus twice as long

as ischium, relatively thick, flexor margin with a few tubercle-like or obsolescent spines on distal third, distolateral spine short and blunt. Pereopods sparingly with soft setae. P 1 with tubercles on dorsal surface of merus and on proximal dorsal part of carpus; ischium dorsally with basally broad, short spine, ventromesially unarmed; merus slightly shorter than carapace; carpus 1.2 × longer than merus; palm as long as carpus; fingers distally incurved, crossing when closed, opposable margins sinuous. P 2-4 relatively short and thick; meri having length-breadth ratio, 3.3 on P 2, 2.9 on P 3, 2.6 on P 4, dorsal margins with row of small widely spaced spines; P 2 merus 0.7 × length of carapace, as long as P 2 propodus; P 3 merus 0.9 × length of P 2 merus, P 4 merus 0.9 × length of P 3 merus, 0.7 × length of P 4 propodus; carpi subequal, relatively short, 0.7 × length of dactyli on P 2, 0.6 × on P 3 and P 4, onethird length of propodi on P 2-4; propodi having flexor margin slightly concave, with pair of terminal spines only; dactyli longer than carpi (dactylus-carpus length ratio, 1.5 on P 2 and P 3, 1.6 on P 4), about half as long as propodi, proportionately broad distally, flexor margin nearly straight, with 10-11 spines, ultimate spine slender, penultimate spine pronouncedly broad, preceded by 8-9 slender spines somewhat inclined, closely arranged but not contiguous to one another.

REMARKS — The specimen agrees well with the previous species accounts ( Baba 2000; Ahyong & Poore 2004). No additional characters of significance are noted.














Uroptychus raymondi Baba, 2000

Baba, Keiji 2018

Uroptychus raymondi

AHYONG S. T. & POORE G. C. B. 2004: 73
BABA K. 2000: 250