Cyathura rudloei Kensley 1980

Cyathura rudloei

MATERIAL.—Holotype (Copenhagen Museum): 1 , TL 3.5 mm. Paratypes (Copenhagen Museum): 1 , TL 3.5 mm, 20 ovig , ± 200 [Theo Mortensen Expedition, 1900; Koh Chang. Gulf of Thailand]. Paratypes: USNM 171694, Sta JR 24A, 1 ovig , 1 ; USNM 171694, Sta JR 38, 1 ovig , 1 , 1 juv; USNM 171697, Sta JR 63–2, 1 ovig , 5 juvs; USNM 171695, Sta AB 371G, 1 , 1 .

DESCRIPTION.—Female: Integument not indurate, minutely setose, setation more obvious posteriorly. Body proportions: C < 1 > 2 = 3 = 4 = 5 > 6 > 7. Dorsal surface of cephalon, pereonites, and pleon with shallow reticulation of grooves. Eyes dorsolateral; rostrum broadly triangular, extending slightly beyond anterolateral corners. Shallow dorsal pits present on pereonites 3–5. Pleonites 1–5 fused, shorter than pereonite 7; pleonite 6 laterally distinct, medially fused with telson. Latter parallel sided with middorsal proximal indentation, distally evenly rounded.

Antennular peduncle 4–segmented, basal segment broad, equal in length to second and third segments together; fourth segment minute; flagellum of 2 articles, short distal article bearing three aesthetascs and few setae. Antennal peduncle 5–segmented, flagellum reduced to three very short setose articles. Mandibular palp 3–segmented, basal segment about half length of second segment; third segment two-thirds length of second segment, with elongate strongly serrate spine and three shorter finely serrate spines; incisor of three cusps; lacinia with 12 or 13 serrations; molar narrowly triangular. Maxilla with strong distal spine plus six smaller spines; short inner ramus bearing single apical seta. Maxilliped 4–segmented, with numerous short setules, terminal segment set obliquely on penultimate segment, with five simple setae on inner distal margin. Pereopod 1 unguis slightly more than half length of dactylus, with strong supplementary spine; propodus broad, palm with strong, proximal rounded lobe and three serrate spines near dactylar base; carpus triangular, distally projecting as a rounded lobe; posterior margin of dactylus, propodal palm, and carpus bearing short spinose scales. Pereopod 2 propodus cylindrical, with single serrate posterodistal spine. Pereopod 7 with posterior (ventral) surface of propodus bearing spine-scales, and single serrate distal spine; carpus triangular, slightly underriding propodus. Pleopod 1 exopod operculiform, broad, not indurate, with numerous distal plumose setae; endopod reduced to short, narrow lamella; basis with four retinaculae. Uropodal exopod reaching to base of endopod, latter basally broader than basis; entire appendage bearing dense pile of very short setules.

Male: Body and appendages as in female except for antennule, mandibular palp, and pleopod 2. Antennular flagellum short, of three articles bearing clusters of aesthetascs. Terminal segment of mandibular palp with eight spines (five in female). Pleopod 2 copulatory stylet on endopod distally curved, sabre shaped, extending beyond rami.

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