Cretachyzeria macroseta, Liu & Fan & Ren, 2025
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publication ID |
https://doi.org/10.3897/fr.28.e158587 |
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publication LSID |
lsid:zoobank.org:pub:48CA60B8-1ECB-4D2D-9C65-6BE58A815B2C |
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DOI |
https://doi.org/10.5281/zenodo.16738611 |
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persistent identifier |
https://treatment.plazi.org/id/3824A8DE-4BCF-5787-A05C-0F6618DD6E44 |
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treatment provided by |
by Pensoft |
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scientific name |
Cretachyzeria macroseta |
| status |
sp. nov. |
Cretachyzeria macroseta sp. nov.
Figs 1 View Figure 1 , 2 View Figure 2
Diagnosis.
As for the genus.
Description.
Active postlarval form, female (?). Maximum length (gnathosoma and idiosoma) 2466; gnathosoma 783; idiosoma 1683; maximum width 1069.
Idiosoma dorsum (Fig. 1 A, C View Figure 1 ). Idiosoma suboval, narrowing anteriorly, anterior margin nearly truncate, and widest between bases of legs II and III; nearly parallel between legs III and IV. Posterior rounded, visible on venter. Prodorsum partly obscured by large bubble, remaining areas discernible; dense and short setae present, setal shape and base unclear due to impurities. Faint crista metopica (Fig. 2 A View Figure 2 ) in middle region near leg I, anterior and posterior extension not visible. Sensillary area oval, sensilla blurry. Two pairs of eyes (Fig. 2 A View Figure 2 ) at anterior edge, near base of leg II. Two pairs of large cylindrical protrusions (Fig. 2 C View Figure 2 ) at level of leg III, with tiny gaps between. Protrusions bear extremely long and dense setae (1800 long), covering entire hysterosoma and extending beyond posterior edge, rendering area invisible.
Idiosoma venter (Fig. 1 B, D View Figure 1 ). A complete outline visible, same as dorsum. Front part and lower right corner obscured by bubbles. Entire ventral surface covered with dense and relatively short setae, resembling anterior dorsum. Genital opening (Fig. 2 B View Figure 2 ) slit-like, 276 long, located after leg IV coxae, surrounded by paired sclerites, each sclerite covered with setae. Anus blurred and equivocal.
Gnathosoma (Fig. 2 D, E View Figure 2 ). Chelicera not visible. Palps slender and significantly elongated, 530 long, base extending downward. Palps with dense setae, divided into 5 segments; trochanter not visible; femur longest, distal part thick; genu slender, base narrower than distal part of femur; tibia short, similar in width to genu, tibial claw well developed, smooth, and knife-shaped distally; tarsus elongated, slender at base, then gradually widens, and the end circular.
Legs (Figs 1 View Figure 1 , 2 F, G, H View Figure 2 ). Long and slender; legs I and IV slightly longer than legs II and III. All legs with 7 segments (femur divided into basifemur and telofemur). Coxa and trochanter of legs approximately square; basifemur thicker, tapered distally, with an obvious middle groove; telofemur, genu, tibia, and tarsus cylindrical, tapering from telofemur to tarsus. Legs II-IV with strong, smooth, hook-shaped tarsal claws (Fig. 2 F, G, H View Figure 2 ); leg I claws undiscernible (likely to have been present). Lengths of legs and segments: leg I 2093, coxa I 133, trochanter I 112, basifemur I 347, telofemur I 352, genu I 313, tibia I 373, tarsus I 463; leg II 1639, coxa II 138, trochanter II 112, basifemur II 207, telofemur II 327, genu II 226, tibia II 262, tarsus II 367; leg III 1557, coxa III 131, trochanter III 111, basifemur III 282, telofemur III 220, genu III 201, tibia III 279, tarsus III 333; leg IV 1932, coxa IV 245, trochanter IV 158, basifemur IV 329, telofemur IV 235, genu IV 236, tibia IV 387, tarsus IV 342.
Etymology.
The specific epithet macroseta is a combination of macro- (macros, meaning long) and seta (bristle), referring to this species having extremely long bristles.
Type material.
Holotype (No. CNU-TRO-MA 2014001 ) preserved in a piece of Myanmar amber, collected from the Hukawng Valley of Kachin Province, northern Myanmar . Holotype deposited in the College of Life Sciences , Capital Normal University.
Remarks.
The new species is distinctly different from species in Parachyzeria by having the setae on protrusions extending far beyond the posterior edge of the dorsum. In contrast, for P. indica , these setae do not exceed past the posterior edge of the dorsum, and their length is close to that of the dorsal opisthosoma; for P. poecilotrichum , these setae are far from the posterior edge of the dorsum, and their length is significantly less than that of the dorsal opisthosoma. In addition, Zmudzinski (2022) reported a new species of Parachyzeria in Myanmar amber, but it was not named or described. Based on the accompanying picture, the dorsal setae of this species do not extend beyond the body margin, which would make it significantly different from the new species.
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.
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Pteridopinae |
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