842
Journal of Paleontology 92(5):838–849
Figure 3. Soligorskopterus tchepeliensis n. gen. n. sp., holotype, BKM 1052, specimen preserving the ventral surface: (1) specimen photograph (note the pink- red sylvinite directly adjacent to and under the specimen); (2) interpretive drawing. GA, genital appendage; LE, lateral eyes; M, metastoma; MR, marginal rim; MS, median suture; PT, pretelson; S, spines; TE, telson; VP, ventral plate; 1–12, sternites. Prosomal appendages are labeled with Roman numerals (I− VI), and individual podomeres are labeled with Arabic numerals (1−9), ordered proximally to distally. Scale bar=10mm.
The mesosoma is of generally constant width, with the metasoma narrowing from the seventh opisthosomal segment onward. Because the specimen is preserved in ventral aspect, the dorsal tergites of the mesosoma are not seen; however, the ventral structures of the genital appendage and opisthosomal opercula are evident. The genital operculum comprises a clear median and posterior opercular plate, with evidence of a narrow anterior opercular plate provided through imprints within the sediment. The median opercular plate is 9mmlong, with a posterior width of 70mm, whereas the posterior opercular plate has a length of 12mm and a posterior width of 76mm. A large Type A genital appendage is present (8mmwide, at least 38mmlong), extending to at least the fourth opisthosomal segment. A deltoid plate is apparent to the right of the insertion of the genital appendage into the median opercular plate. The genital appendage itself has a carina running along its length and is composed of at least two segments, with the division occurring slightly posterior to the posterior margin of the third opisthosomal segment. The first postgenital operculum (corresponding to the third opisthosomal segment) is 13mmin length with a posterior width of 75mm. The operculum of the fourth segment has a length of 13mm with a posterior width of 74mm, that of the fifth segment has a length of 14mm and a posterior width of 74mm, and that of the sixth segment has a length of 15mm and a posterior width of 71mm. The metasoma is represented by the sternites, which are
fused laterally to the tergites to form ankylosed segments. The seventh segment has a length of 11mm and a posterior width of
69mm; the eighth segment has a length of 15mm and a posterior width of 68mm; the ninth segment has a length of 16mm and a posterior width of 61mm; the tenth segment has a length of 17mm and a posterior width of 54mm; the eleventh segment has a length of 21mm and a posterior width of 45mm. The pretelson is elongated, having a length of 40mm and a posterior width of 20mm, resulting in a length/width ratio of 2.0. The posterolateral margins of each metasomal segment are produced into short epimera. The epimera of the pretelson are reduced to appear almost absent. The cuticular sculpture of the metasomal sternites consists of small, closely situated semilunate scales. These scales exponentially increase in size (from 0.4–0.5mm to 5mm) on sternites 10–12, with some becoming acicular and forming a pair of crests running in parallel flanking the center of the sternites. The telson is styliform and 73mm in length. Where the
cuticle has worn away impressions of the sediment reveal the presence of a moderate dorsal keel. The ventral surface of the telson is shown to bear a continuation of the enlarged scale ridge that runs down the center of the telson, with the scales progressively decreasing in size toward its tip. The first paratype (BKM 943; Fig. 4) is an almost intact
specimen in ventral view preserving the opisthosoma and portions of the prosomal appendages and metastoma. The total length of the specimen is 25 cm. The prosoma is fragmentary, preserving some evidence of a narrow marginal rim and the ventral plate and its transverse suture. The prosomal appendages are incomplete, with
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