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| Format: | Recurso digital |
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Zenodo
2025
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| Online Access: | https://doi.org/10.5281/zenodo.15755244 |
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Table of Contents:
- <p><i>Metashinobius</i> Wei & Liu gen. nov.</p><p><i>Metashinobius hikariae</i> Wei & Liu. Type species.</p><p><b>Description</b></p><p>Male small-sized (total length approximately 5.00). In dorsal view, carapace pear-shaped, anterior eye row slightly recurved, ALE subequal to AME; posterior eye row recurved, posterior eyes larger than anterior eyes and anterior eye row wider than posterior median eye row. Secondary eyes with grate-shaped tapetum. Cheliceral promargin with 3 teeth, retromargin with 4 teeth, with the third one smaller than the others. Leg formula: 1423. Trochanters notched. Sternum heart-shaped. Colulus present. Colour in alcohol: carapace blackish-green, with a large central pattern and dark margin, four stripes present behind each posterior eyes; cephalic groove and radial furrow black; fovea distinct, longitudinal. Legs yellow-brown, femurs, patellae and the distal tip of tibiae with dark patterns, metatarsi and tarsi brownish-red. Each paired tarsal claw with 12 teeth, unpaired claw with one tooth. For leg spination, see in species description. Abdomen with dark patterns. Male palp same as for the species.</p><p>Females unknown.</p><p><b>Diagnosis</b></p><p>The new genus resembles <i>Shinobius</i> Yaginuma, 1991 and can be distinguished from the latter by: 1) having 4 postmarginal teeth (Fig. 2 E), versus having 3 postmarginal teeth in the latter (Sierwald 1993, Wang et al. 2024, Zhang et al. 2024); 2) the presence of a modified retrolateral tibial apophysis and a large ventrodistal protuberance (Fig. 1 A and B), versus lacking the retrolateral tibial apophysis and having a small ventrodistal protuberance in the latter (figs. 20 and 21 in Sierwald (1993); figs. 3 A and B in Wang et al. (2024); figs. 2 A and B in Zhang et al. (2024)); 3) the median apophysis is thick, with a uplifted ventral division and a lateral division and the tip of the guide groove points downwards (Fig. 1 A, C and D), versus being thin, with a flat ventral division, without lateral division and the guide groove pointed upwards (figs. 20 and 21 in Sierwald (1993); figs. 1 A – D in Wang et al. (2024); figs. 2 A, B, 3 A and C in Zhang et al. (2024)).</p><p><b>Etymology</b></p><p>The generic name is derived from its similarity to <i>Shinobius</i> and the Greek adjective Meta for after. The gender is masculine.</p><p><b>Distribution</b></p><p>Guizhou Province, China</p><p><b>Notes</b></p><p>We place this new genus under the family Trechaleidae by: 1) the posterior eye row being recurved; 2) the presence of a ventrodistal rim of the male palpal tibia; 3) the median apophysis being large and divided into ventral and dorsal divisions, with a dorsal guide groove located on the dorsal division (Carico 1993). The new genus resembles <i>Shinobius</i> most, but cannot be placed in the subfamily Rhoicininae as the latter, due to the presence of the unique retrolateral tibial apophysis (which is absent in all genera of Rhoicininae); nor can it be accommodated within other trechaleids clade such as subfamily Trechaleinae Simon 1890, based on the Asian distribution and the relatively long anterior eye row. Definitive subfamily classification requires additional specimens to supplement critical morphological data; therefore, the subfamily placement is withheld in the current paper.</p>