Globosolembos forgesi Myers 1998, n.sp.
Creators: name: Myers, Alan A.
Publisher: name: Zenodo
Year: 1998
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Aoridae
Globosolembos
Globosolembos forgesi

description: <i>Globosolembos forgesi</i> n.sp. Figs. 9-10 Type material. HOLOTYPE male, 4.0 mm, AM P52760, off Recif To, Passe de Boulari, 22°30.15'S 166°26.43'E, rocks encrusted with lithothamnia, 30 m, ORSTOM divers, 8 November 1995, NCL-45. PARATYPES, 2 ¥¥, AM P52761, NCL-45. Diagnosis. In life: rear of each pereon segment with thin TODO band. Margins of cephalon and base of antenna 1 TODO 1 also orange banded. Eye large, chocolate brown. TODO TODO (one week): white, eye colourless. Male 4.0 TODO TODO TODO mm. Head. lateral lobes only moderately mC~Cl.e:ratlelY large; distoventralmargin poorly recessed, moderately deep. Antenna 1 peduncular article 1 longer than head; other articles missing in all specimens. Antenna 2 peduncular articles 4-5 and flagellum missing in all specimens. Mouthparts of typical <i>Globosolembos</i> structure; mandible palp article 3 longer thaQ. 2, posterior margin weakly falcate, with a few long marginal setae and an understory of short unequal sized setae. Male gnathopod 1 coxa produced forward, rounded; basis stout, excavate on anterior outer face for reception of carpus when folded, anterodistal margin of inner face produced into a rounded spur; carpus subtriangular, cup-shaped,. broader than long; propodus subovoid, palm short, defined by a triangular process and lacking a stout seta, posterior margin medially with a strong forward directed spine; dactylus strong, falcate, opposable to medial spine. Female gnathopod 1 similar to that of male, but palm sinuous, produced into a triangular process and lacking a medial spine on the posterior margin. Gnathopod 2 coxa subrectangular, rounded; basis elongate, anterior margin weakly concave; carpus subtriangular, nearly twice as long as broad; propodus subrectangular, subequal in length with carpus, palm oblique, evenly convex; dactylus slightly overlapping palm. Pereopods 3-4 dactylus a little over half length of propodus. Pereopods 5-7 missing in all specimens. Epimera posteroventral corner rounded. Uropod 1 peduncle longer than outer ramus and with strong distoventral spine, less than one half length of peduncle; inner ramus a little longer than outer, each ramus with stout marginal setae. Uropod 2 peduncle shorter than inner ramus and with strong distoventral spine, less than one half length of peduncle; inner ramus longer than outer, both rami with many stout marginal setae. Uropod 3 rami longer than peduncle; inner ramus longer than outer, with two marginal strong setae; outer ramus with a small second article and a pair of long marginal setae; both rami with long distal setae. Telson dorsolateral crests each with a pair of unequal slender setae. 剾浡牫献 This species.differs. from.most <i>.. Globosolembos</i> species in the strong posteriofrnarginal spine on the male gnathopod 1 propodus. In this respect it resembles males of species in genera such as <i>Bemlos, Protolembos</i> and others. However, that this is a homoplasy can be seen by the weak sexual dimorphism of the gnathopoda and the mandible palp article 3 shape (elongate, weakly falcate) and setation (unequal sized understory of short setae on posterior margin) which are diagnostic characters of <i>Globosolembos.</i> The male gnathopod 1 resembles that of <i>Globosolembos excavatus</i> in general shape, differing only in the development of a medial tooth. In <i>Bemlos</i> and <i>Protolembos</i> the tooth develops in young males as a small excavation in the palm. This excavation deepens and in some species the tooth then migrates to a more medial position. Unfortunately juveniles of G. <i>forgesi</i> are not available for examination, but it is anticipated that the tooth may develop differently in this species, since it appears to be a secondary rather than primary feature. Habitat. On rocks encrusted with lithothamnia, 30 m. Distribution. Known only from the type locality. Etymology. Named after the carcinologist Dr Bertrand Richer de Forges of ORSTOM. <i>Grandidierella</i> Coutiere <i>Grandidierella kanakensis</i> n.sp. Figs. 11-12 Type material. HOLOTYPE male 3.2 mm, AM P52762, off Ilot Maitre, 22°20.50'S 166°24.40'E, <i>Cymodocea,</i> 0.3 m, A.A. Myers, 6 November 1995, NCL-27. Diagnosis. Male, 3.2 mm. Pereon lacking sternal processes. Head lateral lobes scarcely produced; eye moderately large; distoventral margin poorly recessed. Antenna 1 three quarters body length; peduncular articles in the basi-distallengthratios 7:9:3; accessory flagellum composed of a single article about one third length of flagellar article 1; flagellum longer than peduncle with 14 articles, the terminal article rudimentary, articles 4, 6 and 8-13 with aesthetascs. Antenna 2 robust, sub-pediform, subequal in length with antenna 1; peduncular articles 4 and 5 subequal; flagellum a little shorter than peduncular article 5, with 6 articles, articles 4-6 with stout ventral 繥瑡攮 ···Mouthparts not dissected. Male gnathopod 1 basis very enlarged, subovoid, weakly setiferous; carpus massive, subovoid, weakly setiferous, with a strong forward projecting spineon the innerface, close to theposteroproximal margin and with a similar strongspine on the posterodistal margin; propodus much less than half length and breadth of carpus, palm obsolescent; dactylus stout, three quarters length ofpropodus, ventralmargin with threestrongteeth. Gnathopod 2 basis.flask-shaped, anterior margin with irregular flange; carpus subtriangular, anterior margin with a brush of very long setae; propodus subrectangular three quarters length of carpus, but less than half its width, palm oblique, weakly convex; dactylus strong, slightly overlapping palm. Pereopods 3-4 basis anterior margin weakly convex; dactylus a little shorter than propodus. Pereopods 5-7 in the length ratios 6:9:11; pereopod 7 basis posterior margin with a few long pectinate setae. Epimera 1-3 rounded, each with a small distoventral seta. Uropod 1 peduncle longer than rami, with a small interramal spine, one sixth length of peduncle; rami subequal. Uropod 2 peduncle shorter than rami, lacking an interramal spine; inner ramus longer than outer. Uropod 3 uniramous; peduncle short less than one quarter length of slender ramus. Telson dorsolateral crests each with a pair of unequal slender setae. Female unknown. Remarks. This species is similarto G. <i>bispinosa</i> Schellenberg, but differs in the structure of the male gnathopoda. Gnathopod 1 carpus has a strong posteroproximal spine and lacks a spine on the inner medial face and the stout dactylus bears very strong teeth. Gnathopod 2 has the carpus sub-triangular, the propodus only two thirds the length and two thirds the breadth of the carpus. Ledoyer (1984) described a single male specimen of <i>Grandidierella</i> from the same locality and habitat as the present material, under the name G. <i>bispinosa</i> Schellenberg. He did not describe or figure a posteroproximal spine on the male gnathopod 1 carpus, or note deep toothing on the dactylus. In addition, the male gnathopod 2 is figured as subequal with the carpus and the carpus is sub-ovoid. Ledoyer's material was of a similar size to present material. Its synonymy remains unresolved.
description: Published as part of <i>Myers, Alan A., 1998, The Amphipoda (Crustacea) of New Caledonia: Aoridae, pp. 187-210 in Records of the Australian Museum 50 (2)</i> on pages 198-201, DOI: 10.3853/j.0067-1975.50.1998.1279, http://zenodo.org/record/4653011
description: {"references": ["Ledoyer, M., 1984. Les gammariens (Crustacea, Amphipoda) desherbiersdephanerogames marines de Nouvelle Caledonie (region de Noumea). Memoires du Museum Nationale d'Histoire Naturelle A, Zoologie 129: 1 - 113."]}