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Elasmopus balkomanus, a New Species from the Florida Keys (Crustacea, Amphipoda)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Thomas, James D. Barnard, J. Laurens |
| Copyright Year | 1988 |
| Abstract | -Elasmopus balkomanus is described from Looe Key Reef in the florida Keys. The species is very close to the eastern Pacific E. antennatus but in the male has equally extending rami on uropod 3, only 2 (versus 4-6) spines on each lobe of the tel son in adults, a lateral ridge on the propodus of male gnathopod 2 and very heavily armed flagella of antenna 2 in the male. This species lives in a short-tufted algal turf community on coral rubble but apparently is rare because it has only been collected once in 10 years of sampling in the florida Keys. Elasmopus balkomanus, new species Figs. 1-3 Etymology. -A.S. balko, ridge; L, manus, hand. Diagnosis oj male. -Eyes ordinary, brownish-purple in alcohol. flagellum of male antenna 2 densely setose. Mandibular palp article 3 deeply falcate. Palm of male gnathopod 2 with weak, sparsely spinose hump neardactylar hinge, no marginal teeth, inner face with longitudinal, cuspidate ridge, setae all posterior ("below") ridge and not organized into rows perpendicular to ridge; dactyl overriding palm onto face of propodus. Article 2 of per eo pods 5-7 with only tiny setules and tiny serrations posteriorly; locking spines of pereopods 3-7 thin and almost straight, smooth; main subapical spine-seta on dactyl of medium thickness, smooth, with 2 accessory thin setules. Epimera 1-2 with medium sharp posterovenIral tooth, all ventral spines short, rarely paired. Uropod 3 with "long" rami (in generic context), inner almost as long as outer. Telson with sharply and deeply incised apices each bearing pair of spines, one spine elongate, other spine short. Description oj male. Body generally as in other species of genus (for side views of body form in Elasmopus see Sars 1895, Barnard 1962, Bousfield 1973). Antenna I elongate, slender, article I with 3 ventral spines in tandem, accessory flagellum 3-articulate. flagellum of antenna 2 densely armed with flags of setae. Upper lip rounded below, projecting slightly in front of epistome from side view. Incisors of right and left mandibles with 2 teeth , right lacinia mobilis bifid, proximal branch simple, distal branch with 7 teeth, left lacinia mobilis with 4 teeth; right rakers 3, left 4; molars moderately triturative, each with plumose seta; palp article I weakly elongate, article 2 with 2-3 short medial setae, 2-3 apicomedial long setae, article 3 with I-I A setae, many D setae forming comb on falcate invagination, 3 E setae. Lower lip, maxilla 2 and maxilliped like figure 35 of Barnard (1979) with following minor exceptions. Inner plate of maxilla I with 2 apical setae and 4 apicolateral setules, outer plate with 7 spines, palp article 2 with 2 sharp cusps, one apicolateral seta, 4 apicomedial marginal elements (2 thick, 2 thin) and 4 facial setae. Both lobes of maxilla 2 equally thin, inner plate with only single apicomedial seta no longer than apical setae, outer plates asymmetrical, no cusps, 3 facial 5 apicomedial, 3 apicolateral setae. Inner plate of maxilliped with weak apicomedial cusp, 8 apical setae, 6 medial setae, outer plate with 10 medial blades, 5 apicolateral setae, palp article 3 with scaly apicolateral irregular VOLU ME 101 , NUMBER 4 |
| Starting Page | 838 |
| Ending Page | 842 |
| Page Count | 5 |
| File Format | PDF HTM / HTML |
| Volume Number | 101 |
| Alternate Webpage(s) | https://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1600&context=occ_facarticles&httpsredir=1&referer= |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
