Hyposternus, Joharchi & Halliday, 2021
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publication ID |
https://doi.org/ 10.11646/zootaxa.5048.3.5 |
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publication LSID |
lsid:zoobank.org:pub:E468FA7C-0A49-4BA2-A98C-9A9FE6C5D873 |
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DOI |
https://doi.org/10.5281/zenodo.5569496 |
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persistent identifier |
https://treatment.plazi.org/id/65750D68-FFE5-FF99-FF2B-33BBFA1573EE |
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treatment provided by |
Plazi |
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scientific name |
Hyposternus |
| status |
gen. nov. |
Genus Hyposternus gen. nov.
Type species: Hyposternus ceylonicus sp. nov.
Diagnosis (adult female). The genus can be readily distinguished from other Laelapidae by the shape of the sternal shield of the female. The shield is strongly desclerotised, except for narrow lateral and anterior ridges, which are fused with endopodal plates I/II and II/III. The pre-sternal platelets are apparently fused with the sternal shield, the epistome projects anteriorly, and the movable digit of the chelicera tapers apically. Caudal seta Z5 is longer and thicker than other setae on the dorsal shield; and the anal shield is long and narrow, and flanked by a few pairs of long thick opisthogastric setae. Femora II–IV bear elongate dorsal setae ad1.
Description. Adult Female.
Dorsal idiosoma ( Figs 1 View FIGURES 1–7 , 8, 10 View FIGURES 8–11 ). Dorsal shield covering idiosoma, oval-shaped, slightly extending onto ventrolateral aspect of idiosoma, bearing 38 pairs of setae, 21 pairs of podonotal setae, z3 absent, 17 pairs of opisthonotal setae, including two pairs of Zx setae.
Ventral idiosoma ( Figs 2 View FIGURES 1–7 , 9, 11–14 View FIGURES 8–11 View FIGURES 12–17 ). Separate pre-sternal platelets absent, apparently fused with sternal shield; sternal shield markedly reduced to lateral and anterior ridges ( Fig. 12 View FIGURES 12–17 ), anterolateral edges fused to endopodal elements to form arms projecting between coxae I–II, bearing three pairs of smooth setae ( Figs 2 View FIGURES 1–7 ). Metasternal setae st4 and associated poroids (iv3) located on soft integument.
Gnathosoma ( Figs 3–7 View FIGURES 1–7 , 15–16 View FIGURES 12–17 ). Epistome projecting anteriorly (more than usual), anterior margin truncate, irregularly denticulate ( Fig. 6 View FIGURES 1–7 ). Hypostomal groove with six transverse multidenticulate rows of denticles, with smooth anterior and posterior transverse lines, groove greatly widened anteriorly. Movable digit of chelicera narrowing and tapered apically.
Legs ( Figs 18–21 View FIGURES 18–21 ). Leg I & IV moderately long, leg I approximately as long as idiosoma, leg IV longer than idiosoma; all legs with well-developed paired subequal claws and rounded pulvilli borne on ambulacral stalk. Many setae on tarsi II–IV thickened or spine-like, especially ventral setae, macrosetae (ad1) present on femora II–IV ( Figs 19–21 View FIGURES 18–21 ).
Male ( Figs 22–23 View FIGURES 22–23 ). As for female except sternal, genital, endopodal, ventral and anal shields fused into holoventral shield, with ten pairs of smooth setae; movable digit of chelicera with one tooth, spermatodactyl stout, with truncate tip, free portion of spermatodactyl about as long as movable digit ( Fig. 23 View FIGURES 22–23 ).
Etymology. The name Hyposternus refers to the distinctive reduction of the sternal shield. Gender masculine.
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.