Cyathura profunda Kensley 1982

"Cyathura profunda n. sp.

FIGURES 3-5; PLATES 1-3

DESCRIPTION.- Ovigerous Female: Integument in­durate, bearing numerous tiny spinose tubercles. Body proportions: C < 1 = 2 > 3 < 4 > 5 >6 > 7. Cephalon, pereon, and pleon with shallow irregular grooves. Cephalon with rostrum and anterolateral lobes demarked by strong groove; eyes lacking. Pleonites 1-5 fused, segments indi­cated by short epimera and interrupted irregular dorsolateral grooves; pleonite 6 lacking free lat­eral margins, with strong middorsal slit in poste­rior margin, fused to telson middorsally. Telson with margins gently tapering to broadly rounded apex, with low rounded middorsal ridge becom­ing obsolete in distal third; proximolateral hol­lowed area adjoining pleonite 6; statocyst open­ings narrow, situated at base of middorsal ridge.

Antennule with basal segment subequal to three distal peduncular segments together; fourth segment very short; flagellum of three articles, two distal setose articles very small. Antenna with second peduncle segment grooved to accommo­date antennule; flagellum of single short setose article. Mandibular palp 3-segmented, middle segment longest, distal segment bearing row of 12 fringed spines; molar low, bluntly rounded; inci­sor of three strong cusps; lamina dentata of 11 serrations. Maxilla of single large and six smaller spines. Maxilliped 4-segmented, fourth segment small, oval, set obliquely at distolateral corner of third segment, with four setae on medial margin; third segment with four short mediodistal setae; second and third segments subequal in length. Pereopod 1 subchelate, propodus expanded, pal-mar margin straight, with low rounded proximal convexity, with row of 11 or 12 simple setae; inner surface with 17 to 20 setae. Pereopods 2-7 essen­tially similar; propodi elongate-linear, carpi tri­angular, with very short anterior margin, under-riding propodus. Marsupium of three pairs of oostegites on pereonites 3-5. Pleopod 1 exopod operculiform, indurate, with low rounded proxi­mal ridge, tapering strongly in distal half; exo­pods of left and right side overlapping in midline, especially distally; endopod half width and about three-quarters length of exopod. Uropodal exo­pod reaching level of telsonic apex, broadly oval, distally subacute, outer margin faintly sinuous; basis almost reaching telsonic apex, parallel-sided in dorsal view, triquetrous with strong ventral ridge; endopod oval-rounded, extending beyond telsonic apex.

Male: Anterior body essentially similar to fe­male; pleon relatively more elongate. Antennule with dense clusters of aesthetascs on third flagellar article. Pereopod 1 propodus with about 40 setae on inner surface. Pleopod 2 with copulatory stylet extending about half its length beyond endopod, distally evenly rounded."

(Kensley, 1982: 4-12)

Cyathura profunda

MATERIAL.—Holotype: USNM 185036, Sta WHOI 237, 1 , 16.5 mm. Allotype: USNM 185037, Sta WHOI 237, 1 ovig. , 10.5 mm. Paratypes: USNM 185038, Sta WHOI 237, 10 , 10.5–17.5 mm, 10 ovig. , 9.0–11.0 mm; ZMC, Sta WHOI 237, 10, 10 ovig. . Additional material: SIO, Sta WHOI 236, 42 ovig. , 122 , 422 non-ovig. and juvs.; Sta WHOI 237, 27 ovig. , 110 , 567 non-ovig. and juvs; Sta WHOI 245, 4 ovig. , 8 , 84 non-ovig. and juvs; Sta WHOI 262, 5 ovig. , 22 , 86 non-ovig. and juvs; Sta WHOI 264, 1 , 53 non-ovig. and juvs.

DESCRIPTION.—Ovigerous Female: Integument indurate, bearing numerous tiny spinose tubercles. Body proportions: C < 1 = 2 > 3 < 4 > 5 > 6 > 7. Cephalon, pereon, and pleon with shallow irregular grooves. Cephalon with rostrum and anterolateral lobes demarked by strong groove; eyes lacking. Pleonites 1–5 fused, segments indicated by short epimera and interrupted irregular dorsolateral grooves; pleonite 6 lacking free lateral margins, with strong middorsal slit in posterior margin, fused to telson middorsally. Telson with margins gently tapering to broadly rounded apex, with low rounded middorsal ridge becoming obsolete in distal third; proximolateral hollowed area adjoining pleonite 6; statocyst openings narrow, situated at base of middorsal ridge.


Antennule with basal segment subequal to three distal peduncular segments together; fourth segment very short; flagellum of three articles, two distal setose articles very small. Antenna with second peduncle segment grooved to accommodate antennule; flagellum of single short setose article. Mandibular palp 3-segmented, middle segment longest, distal segment bearing row of 12 fringed spines; molar low, bluntly rounded; incisor of three strong cusps; lamina dentata of 11 serrations. Maxilla of single large and six smaller spines. Maxilliped 4-segmented, fourth segment small, oval, set obliquely at distolateral corner of third segment, with four setae on medial margin; third segment with four short mediodistal setae; second and third segments subequal in length. Pereopod 1 subchelate, propodus expanded, palmar margin straight, with low rounded proximal convexity, with row of 11 or 12 simple setae; inner surface with 17 to 20 setae. Pereopods 2–7 essentially similar; propodi elongate-linear, carpi triangular, with very short anterior margin, underriding propodus. Marsupium of three pairs of oostegites on pereonites 3–5. Pleopod 1 exopod operculiform, indurate, with low rounded proximal ridge, tapering strongly in distal half; exopods of left and right side overlapping in midline, especially distally; endopod half width and about three-quarters length of exopod. Uropodal exopod reaching level of telsonic apex, broadly oval, distally subacute, outer margin faintly sinuous; basis almost reaching telsonic apex, parallel-sided in dorsal view, triquetrous with strong ventral ridge; endopod oval-rounded, extending beyond telsonic apex.

Male: Anterior body essentially similar to female; pleon relatively more elongate. Antennule with dense clusters of aesthetascs on third flagellar article. Pereopod 1 propodus with about 40 setae on inner surface. Pleopod 2 with copulatory stylet extending about half its length beyond endopod, distally evenly rounded.

508-2707