Geoffreya fryeri, Kotov & Sinev & Berrios, 2010
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publication ID |
https://doi.org/ 10.11646/zootaxa.2430.1.1 |
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persistent identifier |
https://treatment.plazi.org/id/03A987D7-FFCC-3F3B-90D9-FF283A43F9A1 |
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treatment provided by |
Felipe |
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scientific name |
Geoffreya fryeri |
| status |
gen. nov., sp. nov. |
Geoffreya fryeri View in CoL gen. nov., sp. nov.
Etymology. This taxon is also named after Professor Geoffrey Fryer.
Type locality. Salar de Lagunillas (locality 3).
Holotype. Parthenogenetic female, MGU Ml 91. Label of holotype: " Geoffreya fryeri sp.n., Holotype, ♀, Lagunillas Salt Lake, Primera Región de Tarapacá, Chile, September 2007, coll. Viviana Berrios, 19º59'S, 68º54'W ". GoogleMaps
Paratypes. 4 parthenogenetic females, MGU Ml 92 .
All type specimens are in 90% alcohol.
Three more parthenogenetic females from type locality were used for the analysis of appendages.
Diagnosis. As for genus.
Description. Parthenogenetic female. In lateral view body somewhat widening posteriorly ( Fig. 24A View FIGURE 24 ), especially in smaller adults ( Fig. 24B View FIGURE 24 ) and juveniles ( Fig. 24C View FIGURE 24 ), of moderate height, maximum height at middle of body. In adults height/length ratio about 0.7, in a sole studied juvenile of instar II – 0.61. Dorsal margin evenly curved; postero-dorsal and postero-ventral angles broadly rounded; posterior margin significantly convex; ventral margin almost straight; antero-ventral angle rounded. Valves with prominent longitudinal lines.
Head of moderate size, triangle-round in lateral view, rostrum short, pointing downward. Eye smaller than ocellus. Distance from tip of rostrum to ocellus 1.5 times greater than that between ocellus and eye. Head shield with maximum width behind mandibular articulation, without any prominent sculpture. Rostrum short, broadly rounded. Posterior margin of head shield broadly rounded, notched. Two large, broadly connected major head pores of very variable morphology ( Figs 24D–F View FIGURE 24 ), posterior pore 1.5–2 times larger than anterior. PP about 0.8–0.9 IP. Lateral head pores minute, located about 1.5–2 IP distance from midline, at the level between major head pores. Labrum relatively small. Distal labral plate without setulation. Labral keel very wide and low (height about 0.6–0.75 width), with broadly rounded apex ( Figs. 24G–J View FIGURE 24 ). Anterior margin of keel convex, posterior margin with a cluster of minute setules, visible only at the highest magnification ( Fig. 24G View FIGURE 24 ).
Ventral margin of valve with about 35–45 setae, anterior 10–15 setae long, middle 8–10 setae short, in posterior group of setae length of setae increase posteriorly, posteriormost setae as long as in anterior group ( Fig. 24K View FIGURE 24 ). Postero-dorsal angle bear about 150 short, very thin setules of same size ( Fig. 24L View FIGURE 24 ). A row of setules along the posterior margin, on inner side of valve at some distance from the margin, these setules not organized into groups.
Abdomen longer than thorax, dorsal surface of abdominal segments not saddle-shaped, without projections and long setules. Postabdomen short, of moderate width, weakly narrowing distally, with a convex distal margin and a broadly rounded dorso-distal angle, length about 2.1–2.2 height ( Figs. 24M–N View FIGURE 24 ). Ventral margin almost straight. Dorsal margin with distal part 1.3 times longer than preanal one, with postanal portion about 1.5 times longer than anal one. Preanal margin almost straight, anal margin concave, postanal margin weakly convex. Preanal angle well-defined, postanal angle ill-defined. Basis of claws bordered from distal margin by clear incision. Postanal portion of postabdomen with 7–9 well-developed marginal denticles, some with 1–2 additional small denticles near base, and with three-five groups of marginal setules on anal margin. 11–18 lateral fascicles setules, distalmost seta of each fascicle longest, 1.5 times longer than marginal denticles. In postanal portion, fascicles consist of 3–5 setules only, distalmost setules very long and thick, 2 times longer than a marginal denticle. Additional fascicles medially to the main row in preanal region. Postabdominal claw of moderate length, slightly shorter than preanal portion of postabdomen. Basal spine very short, about 0.05 of claw length.
Antenna I thick, not reaching the tip of rostrum, with 5–6 clusters of very thin setules at anterior face ( Fig. 25A View FIGURE 25 ). Antennular sensory seta slender, three times shorter than antenna I, arising at 1/2 distance from the base. Nine terminal aesthetascs, three longest about 1/2 length of antenna I. All aesthetascs projecting beyond anterior margin of head shield.
Antenna II short and massive ( Fig. 25B View FIGURE 25 ). Antennal formula, setae 0–0–3/1–1–3, spines 1–0–1/0–0–1. Basal segment robust, branches short and broad, proximal segments of both branches 1.5 times longer than others. Basal and middle exopod segments with clusters of long, hard setules terminally. Seta arising from basal segment of endopod shorter than endopod. Seta arising from middle segment of endopod of similar size with apical setae. Spine on basal segment of exopod longer than middle segment. Apical spine longer than apical segments.
Five pairs of thoracic limbs, limbs III–V are very small as compared with limb I, which is not characteritic of most other Aloninae .
Limb I large, epipodite with a finger-like process as long as epipodite itself ( Fig. 25C View FIGURE 25 ). Accessory seta of absent; ODL with a long seta, armed with minute setules in distal part; IDL with three setae and two-three clusters of setules on ventral face, setae 2 and 3 about 3/4 length of ODL seta, setules of seta 3 longer and thicker than on seta 2, seta 1 minute ( Fig. 25D View FIGURE 25 ). Endite 3 with four setae a–c and 1). On endite 2 there are three setae (d–f), setae e–f robust, armed with robust setules in distal part, little shorter than ODL setae, seta d similar to endite 3 setae a–c, and rudimentary anterior seta 2. Endite 1 with two 2-segmented setae g–h, both setulated in distal part, without a flat seta shifted to limb base, with rudimentary anterior seta 3. Six–seven rows of thin long setules on ventral face of limb. Two ejector hooks, one of them larger than the other. Maxillar process with short seta.
Limb II with exopodite elongated, lacking seta. Eight scraping setae ( Fig. 25E View FIGURE 25 : 1–8), evenly increasing in length distally, scraper 8 positioned in a way it appears much longer than scraper 7. A well-developed soft seta near base of scraper 8. Distal armature of gnathobase with four elements. Filter plate with only six setae, the posteriormost considerably shorter.
Limb III with epipodite supplied with a finger-like projection as long as epipodite itself. Exopodite widening distally, with four terminal setae only ( Fig. 25I View FIGURE 25 : 1–4), lateral setae absent. Seta 4 being longest, seta 2 about 1/3 length of seta 4, setae 3 and 1 short. Distal endite with three setae (25G: 1–3), setae 1–2 slender, sharp, with distal parts unilaterally armed with sharp denticles; seta 3 much shorter, bilaterally armed with long setules. Basal endite with four stiff setae and four soft setae, both increasing in size in basal direction (not illustrated). Distal armature of gnathobase with four elements: the first one elongated, cylindrical sensillum, second thin, geniculate seta, two others are sharp spines; Filter plate III with seven setae (also not illustrated). Limb IV with naked pre-epipodite, epipodite with finger-like projection as long as epipodite itself. Exopodite widening distally, with four terminal setae only ( Fig. 25H View FIGURE 25 : 1–4), lateral setae absent. Seta 4 longest, length of setae 3, 2, 1 about 1/3, 2/3 and 1/2 length of seta 4, respectively. Inner-distal portion with four setae, distalmost seta slender, sharp, armed with sharp denticles, distal flaming-torch seta 1.5 times larger than two others. Three soft setae increasing in size basally. Gnathobase with large sensillum, a 2-segmented seta, and a small hillock distally. Filter plate with five setae.
Limb V with naked pre-epipodite, epipodite with finger-like projection about half length of epipodite itself. Exopodite polygonal, not divided into two lobes, with four plumose setae ( Fig. 25 View FIGURE 25 : 1–4), setae 2–4 decreasing in size basally, seta 1 longer than seta 4. Inner limb portion an elongated lobe, with setulated inner margin. At inner face, two setae (1–2), one 1.5 times longer than other. Filter plate with single seta.
Ephippial female and male unknown.
Size. Single juvenile female II 0.36 mm (heigth 0.22 mm), adult females 0.43–0.55 mm (height 0.28–0.36 mm).
Distribution. Geoffreya frye ri is known from single location only; at the moment, it seems to be a microendemic.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.