Bioacoustics of Mursia

Description . Carapace transversely subovate, convex, nearly 1.2 wide as long. Dorsal surface densely covered with flattened granules of similar size. Rounded protuberances, covered with coalescent granules, disposed in 7 irregular radial rows on dorsal surface. Gastric, cardiac, intestinal regions separated from branchial regions by shallow, sinuous longitudinal grooves. Anterolateral margin arcuate, beaded, denticulate, denticles successively smaller posteriorly. Lateral spine acuminate, prominently upcurved, may reach more than 0.3 carapace width, proximally granular ( Fig. 1 ). Posterolateral margin oblique, sharply convergent, minutely beaded, angled medially. Posterior margin beaded, lateral teeth triangular, dorsoventrally flattened, median lobe effaced. Frontal margin projecting slightly beyond orbits, trilobate, median lobe broadly triangular, at lower plane than lateral lobes; lateral lobes rounded, separated from supraorbital margin by shallow concavity. Antennule obliquely folded. Supraorbital margin with single fissure, minutely granular, with long plumose setae. Inner orbital tooth ogival, separated from outer orbital margin by deep V-shaped cleft, from front by orbital hiatus. Antennae short, slender, basal segment subrectangular, lodged in orbital hiatus. Eye retractable, eyestalk short, granular, setose. Buccal frame rhomboidal, narrowing anteriorly. Thick fringe of plumose setae running the length of third maxilliped exopod, merus; ischium granular, setose. Subhepatic region densely setose. Thoracic sternum narrow, granular. Male abdomen with segments 3–5 fused; prominent trilobate carina on second segment, rounded lateral lobes slightly more prominent than trapezoidal median lobe; penultimate segment subquadrate, lateral margins slightly sinuous; telson triangular, subequal with penultimate segment. Chelipeds massive, subequal. Merus distally bispinose, distal spine longer, stouter than lateral spine. External surface of manus convex, closely granular, upper margin crested, setose, bearing 8 denticles; first tooth low, teeth 2–4 triangular; successive teeth progressively lower, wider. External surface with 9 granular tubercles in 3 oblique rows, 2 tubercles near base of crest; proximal tubercle in lowest row ram-shaped, slightly upcurved, median tubercle dorsoventrally flattened, rounded; distal tubercle smallest, rounded. Internal surface with band of setae near lower margin. Lower margin minutely serrate. Upper margin of dactylus crested, setose, proximally granular; inner surface bearing stridulating ridge of nearly 30 striae. Left dactylus with curved rounded tooth proximally, fitting into depression in pollex. Pereiopods 2–5 slender, laterally compressed, meri minutely granular; dactylus slender, longer than propodus, styliform. First male pleopod thick, slightly curved, distally auriculate, single line of spinules on interior margin. Second male pleopod with corneous distal portion, crook-shaped, tip upcurved ( Fig. 2 ). Color (preserved specimens). Internal surface of palm cream with small bright orange patch distally near the articulation with the dactylus.