Leptathanas powelli Grave, 2008, sp. nov.

• Main Author: Grave, De
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Decapoda; Alpheidae; Leptathanas; Leptathanas powelli; Eagle Island
• Online Access: https://doi.org/10.5281/zenodo.6228012; http://treatment.plazi.org/id/03C5878E63189F13FF46FA474E00C9AA

Leptathanas powelli sp. nov. Figs. 1–5 Leptalpheus sp. Powell, 1985: 236 Material examined: Holotype: ovigerous female (cl 3.2 mm), Nigeria, Niger delta, Eagle Island, Bonny River system, leg. C.B. Powell, 20 September 1979, from burrows of Upogebia furcata (RMNH D52026). Paratypes: 13 specimens, males and females (cl 1.8–3.4 mm), from same lot/locality (RMNH D49914); 5 specimens from same lot/locality (OUMNH 2008-02-001). Derivation of name: Named after the collector of the type series, C. B. Powell (1943–1998), in recognition of his considerable field collecting skills and his advancement of our knowledge of Nigerian Decapoda (see Williamson, 2003). Description: Body moderately elongate (Fig. 1 A), not compressed laterally, glabrous. Orbital teeth absent, pterygostomial angle rounded, branchiostegal margin sparsely furnished with setae, cardiac notch well developed (Fig. 1 D). Frontal margin with shallow, triangular rostrum (Fig. 1 B, C), rostral carina weakly developed, extending to mid-length of carapace. Eyes concealed in dorsal or lateral view (Fig. 1 B, C), without anterior projections, cornea well developed. Ocellar beak not conspicuous. Epistomial sclerite unarmed. Pleura of first through to fourth abdominal somites rounded, those of fifth and sixth somites somewhat angular (Fig. 1 E); sixth somite with subtriangular articulated plate at posteroventral angle. Antennular peduncle moderately stout (Fig 1 C, 3A), second segment shorter than first; stylocerite reaching to mesial margin of second segment, distally acute; lateral flagellum biramous, accessory branch reduced, consisting of two segments furnished with groups of aesthetascs (Fig 3 A). Antenna with basicerite stout, armed with strong ventrolateral tooth; scaphocerite (Fig. 3 B) short, square, anterior margin of blade convex, not extending beyond distolateral tooth; carpocerite robust, exceeding to distal margin of scaphocerite. Mouthparts fairly typical for family. Mandible (Fig. 2 A) with two-segmented palp; molar process as illustrated; incisor ...