Platicrista brunsoni Miller & J.D. Miller, 2021
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publication ID |
https://doi.org/ 10.1093/zoolinnean/zlad151 |
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publication LSID |
lsid:zoobank.org:pub:044A402-2A0F-4135-9410-7DE081CB11C4Corresponding |
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DOI |
https://doi.org/10.5281/zenodo.14536945 |
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persistent identifier |
https://treatment.plazi.org/id/03AF87C4-A625-FFAE-AD85-68EBFA928C96 |
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treatment provided by |
Plazi |
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scientific name |
Platicrista brunsoni Miller & J.D. Miller, 2021 |
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Platicrista brunsoni Miller & J.D. Miller, 2021 View in CoL
Material examined: Two individuals in total (originating from northern Wyoming; loaned by courtesy of Harry Meyer).
Amended description: Buccopharyngeal apparatus of the Platicrista type ( Fig. 22A View Figure 22 ): OCA not visible under PCM; simple pharyngeal annulation composed of tightly arranged single annuli; stylet supports inserted at the junction between the buccal and pharyngeal tubes; furcae of the Platicrista type (cochlear); pharyngeal apophyses not visible; pharynx oval, with two bar-like macroplacoids: the first much shorter than the second (1 <2).
Claws massive, of the Hypsibius type ( Fig. 22B–D View Figure 22 ). Accessory points divergent only on the primary branches of the posterior claws ( Fig. 22D View Figure 22 ). Septa between claw parts absent. Pseudolunulae present at the internal and anterior claw bases. Irregular granulation on legs IV. Internal cuticular bars II–III with irregular margins ( Fig. 22C View Figure 22 ). Internal, anterior, and posterior claw bases delicately indented ( Fig. 22B–D View Figure 22 ). Basal portion of the posterior claws greatly broadened ( Fig. 22D View Figure 22 ).
Dorsal cuticle with large polygonal granulation that extends to the lateral body parts (including legs). Granulation is most distinct in the cephalic ( Fig. 23A View Figure 23 ) to median and more caudal portions of the cuticle ( Fig. 23B View Figure 23 ). However, polygons may merge at the level of legs II–III, and form striae ( Fig. 23C View Figure 23 ). Polygons are different in shape in the caudalmost body portion, being more convex and irregular in shape ( Fig. 23D View Figure 23 ). Cribriform areas not visible under PCM.
Remarks: The original description contained several errors. The buccal tube width should not have been measured, at least not in the holotype, because it is evident from the photograph that the buccopharyngeal tube had collapsed ( Miller and Miller 2021: fig. 2B). This occurs frequently during mounting of Platicrista , Astatumen , and Itaquascon specimens on permanent slides (P. Gąsiorek, pers. obs.) and might be related to their shared similarities in the ultrastructure of the apparatus. The claws of P. brunsoni are of the Hypsibius type, not the Isohypsibius type. Finally, the dorsal sculpturing is not uniform across the dorsum, because the caudalmost polygonal tubercles are disparate in form. This makes P. brunsoni similar to P. cheleusis .
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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SubFamily |
Itaquasconinae |
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