Fengzhen Lu & Li, 2023
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publication ID |
https://dx.doi.org/10.3897/zookeys.1165.102672 |
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publication LSID |
lsid:zoobank.org:pub:00A3E9D0-3E46-4F69-B5D1-1B16DAC47910 |
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persistent identifier |
https://treatment.plazi.org/id/2B5F0371-91D6-4286-A00E-B272FF42397E |
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taxon LSID |
lsid:zoobank.org:act:2B5F0371-91D6-4286-A00E-B272FF42397E |
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treatment provided by |
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scientific name |
Fengzhen Lu & Li |
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gen. nov. |
Genus Fengzhen Lu & Li gen. nov.
Type species.
Fengzhen mengla Lu & Li, sp. nov.
Composition.
Monotypic.
Etymology.
The generic name is dedicated to the late Chinese arachnologist Fengzhen Wang (1906-1978). Gender is masculine.
Diagnosis.
This new genus resembles Medmassa with similar males U-shaped sperm duct (Fig. 5A-C View Figure 5 ) and females spermathecae (Fig. 6A, B View Figure 6 ), but can be easily distinguished by the carapace bulge, highest before the fovea (Fig. 6D View Figure 6 ; carapace broad and flat in Medmassa ), by the venter of the abdomen with large tracheal tubercle, covered with short, stout spines posteriorly (Fig. 6F View Figure 6 ; absent in Medmassa ), by the embolus spine-shaped (Fig. 5A-C View Figure 5 ; embolus partial triangle in Medmassa ), by the tibia with a spine-shaped ventral apophysis and without a retrolateral apophysis (Fig. 5A-C View Figure 5 ; tibia without ventral apophysis but with bifurcated retrolateral apophysis in Medmassa ), by the epigyne with one copulatory opening (Fig. 6A View Figure 6 ; epigyne usually with two copulatory openings in Medmassa ), and by the epigynal plate posteriorly with one membranous, nearly round hood (Fig. 6A View Figure 6 ; absent in most Medmassa ). The new genus also resembles Allomedmassa with similar bulged carapace (Fig. 6D View Figure 6 ) and males spine-shaped tibial apophysis (Fig. 5A-C View Figure 5 ), but can be easily distinguished by the venter of the abdomen with a large tracheal tubercle, covered with short, stout spines posteriorly (Fig. 6F View Figure 6 ; absent in Allomedmassa ), by the embolus slender and spine-shaped (Fig. 5A-C View Figure 5 ; embolus thick and most S-shaped in Allomedmassa ), by the palpal tibia longer than wide and cylindrical (Fig. 5A-C View Figure 5 ; palpal tibia wider than long in Allomedmassa ), by the epigyne with one small copulatory opening (Fig. 6A View Figure 6 ; epigyne with two large copulatory openings and clearly separated in Allomedmassa ), by the epigynal plate posteriorly with one membranous, nearly round hood (Fig. 6A View Figure 6 ; absent in Allomedmassa ), by the spermathecae large and elongate-elliptical (Fig. 6B View Figure 6 ; spermathecae small and reniform in Allomedmassa ), by the copulatory ducts slender and tubular (Fig. 6B View Figure 6 ; copulatory ducts curved and thick in Allomedmassa ), and by the vulva without an accessory gland (Fig. 6B View Figure 6 ; present in Allomedmassa ).
Description.
Small-sized, non-ant-mimicking spiders (Fig. 6C-F View Figure 6 ). Carapace reddish brown to yellowish, obviously convex, highest before fovea, with dark marginal patterns; thoracic region almost round, cephalic region parallel-sided, widest at coxae II, gradually narrowing backwards; radial and cervical grooves indistinct; fovea longitudinal, dark brown. AER almost straight in frontal view, PER procurved in dorsal view; diameters of eyes almost same. MOA almost square. Clypeus height larger than diameter of AME. Chilum present, single, triangular, sclerotized. Chelicerae same color as carapace, with granular protrusions on surface, covered with short setae; with promarginal teeth and retromarginal teeth. Endites longer than wide, subapically with membranous area, apical margin with long, curved setae. Labium wider than long. Sternum shield-shaped, longer than wide. Legs brown to yellowish. Abdomen ovoid, grey; males with dorsal scutum, females without dorsal scutum; venter posteriorly with brown elliptical tracheal spiracle, covered with short, stout spines posteriorly.
Palpal (Fig. 5A-C View Figure 5 ) tibia short, longer than wide, covered with numerous bristles, and with slender spines dorsally; prolateral tibial tubercle triangular; ventral tibial apophysis, located in middle of tibia and spine-shaped. Cymbium long and narrow, with deep furrow ventrally, extending to tip. Tegulum elongate-elliptical, with U-shaped sperm duct. Subtegulum exposed prolaterally. Embolus slender, spine-shaped, and almost straight.
Epigynal region (Fig. 6A, B View Figure 6 ) heavily sclerotized. Epigynal plate round, as wide as long, posteriorly with one membranous, nearly round hood. Vulva with large, elongate-elliptical spermathecae close to each other, pair of fertilization ducts, and with two copulatory ducts converging into one copulatory opening.
Distribution.
China (Yunnan, Fig. 14 View Figure 14 ).
Discussion.
This new genus Fengzhen can be easily distinguished from other genera in the family Corinnidae based on the following two most obvious morphological characteristics: male tibial apophysis located on the ventral surface and female two copulatory ducts converging into one copulatory opening. Morphologically, it is most similar to Medmassa , with the type species Fengzhen mengla sp. nov. being the most similar to M. diplogale Deeleman-Reinhold, 2001 from Borneo. The male palpal embolus and sperm duct of M. diplogale are similar to F. mengla sp. nov. but lack a prominent ventral tibial apophysis ( Deeleman-Reinhold 2001: figs 544-546). At the same time, the hood on the epigynal plate posteriorly is a common feature of M. diplogale and F. mengla sp. nov., and M. diplogale with two obvious copulatory openings ( Deeleman-Reinhold 2001: figs 553, 554). None of the other females in Medmassa have hoods. Another important feature that distinguishes Fengzhen from Medmassa is that the former has a bulging carapace, while the latter has a flat carapace. Based on the above morphological characteristics, we consider the species from Xishuangbanna, China as a new genus Fengzhen gen. nov. Due to the specimen being stored at room temperature for more than ten years, DNA extraction is no longer possible, so cladistics analysis is missing in this work. Therefore, the monophyly of Fengzhen needs further discussion in future work that include molecular analysis.
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