Bioacoustics of Paragalene longicrura

Description . Carapace hexagonal ( Fig. 6A ; also see Türkay 1976b : fig. 1; González Pérez 1995 : figs. 139, 140); front lamellar, marked by median notch bordered on each side by narrow prominence plus wide concave margin ending in a prominence; notch between front, supraorbital border. Orbits ( Fig. 6B ) short, spherical, not expanded on outer portion; triangular, granular outer orbital tooth; supraorbital borders short, curved, with large granules, notches absent. Anterolateral borders ( Fig. 6A ) curved; posterolateral borders long, nearly straight. Dorsal surface of carapace convex anteriorly, granular with granules larger, conspicuous along anterior border. Granular ridge across hepatic region. Elevated protogastric region with 2 granular ridges along anterior margin, deep bifurcated sulcus medially. Branchial region with short, transverse ridge, Cardiac region with 2 shallow, curved grooves. Outer orbital angle with granular margin; anterolateral margin with 4 teeth; anteriormost 2 granular, obtuse; third tooth (largest) curved upward, granular, with smooth, acute apex; fourth straight, granular with smooth, acute apex ( Fig. 6A ). Basal antennal article short, mobile, almost closed by extension of carapace margin, thus distalmost (third) article almost reaches front ( Fig. 6 C, E ). Eye peduncle short, cornea spherical, large, expanded distally ( Fig. 6B ). Suborbital border with large, granular, acute inner tooth, similar median tooth ( Fig. 6C, E ). Anterior border of endostome well demarcated from buccal cavern, ridges faint but clearly defined. Third maxillipeds completely close buccal cavern; anterior outer margin conspicuously expanded, rounded. Endostomial ridge distinct, granular. No visible stridulating mechanism. Cheliped (P1) fingers slender, equal to or less than half propodus length, dark coloured ( Fig. 7A, B ). Propodus dorsally granular; carpus with 2 acute teeth on inner margin ( Fig. 6A ). P2–P5 meri, carpi, propodi long, slender; dorsal margins unarmed; dactyli long, slender, setose ( Fig. 6A ). Thoracic sternum relatively narrow ( Figs. 6D , 7E ). Sternites 1, 2 completely fused, no trace of suture; S2/ 3 complete, deep; S3/4 complete but medially shallow; S4/5, S5/6 medially interrupted; S6/7, 7/8 complete; median longitudinal groove on sternites 7, 8 ( Fig. 7G ). Somite 3 of male abdomen covers thoracic sternal space between P5 coxae, thoracic sternite 8 not visible ( Fig. 7D, F ). Episternites 4–6 laterally expanded ( Fig. 7E, F ); episternite 7 expanded laterally and posteriorly, reaching and partially covering anterior part of P5 coxa but not penis ( Fig. 7G ). Penis coxal, small, short distal extension, emerging just anterior to condyle; very broad, soft proximal expansion ( Fig. 7G ). Sterno-abdominal cavity relatively deep, reaching to before margin of S3/4 ( Fig. 7E ). Press button of male abdomen locking mechanism on posterior half of sternite 5, closer to margin of sternite 6 ( Fig. 7E ). Male abdomen with 5 freely-movable somites (somites 3, 4 fused) plus telson, relatively narrow; somite 1 exposed, not covered by posterior carapace margin, transversely narrow, sublunate in shape; somites 4–6 sharply decreasing in length from somite 3 (widest somite) ( Fig. 7D, F ). Telson subequal, slightly wider than long ( Fig. 6D ). G1 very slender, spinous, slightly dilated apex ( Fig. 8A, B ). G2 slightly longer than G1, flagellum as long as proximal part; thin, lateral projections; pointed, serrated apex ( Fig. 8C, D ). Female specimens unavailable for description.