Baltosidis Szawaryn 2021, GEN. NOV.
Creators: name: Szawaryn, Karol
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Coccinellidae
Baltosidis

description: GENUS † BALTOSIDIS GEN. NOV.
(FIGS 2–4)
Z o o b a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. o r g: act:58C958C5-6656-4749-94C1-69E7666B58EC
Type species: † Baltosidis damzeni.
Diagnosis: Baltosidis is most similar to the genus Parasidis, having ten antennomere antenna with three-antennomere club, ventrite 1 with complete or almost complete v-shape abdominal postcoxal lines and four tarsomeres. However, it can be distinguished by a presence of distinct sutural carinae placed in the apical half of elytra. From similar-looking Coccidophilus Brèthes, 1905 and Stictospilus Brèthes, 1924, it can be separated by four-segmented tarsi (three segmented in both genera) and an antennal club consisting of three antennomeres (in Coccidophilus it consists of two antennomeres).
Description: Length 1.05–1.28 mm. Body elongate, oval and convex (Figs 2D, 3A, 4A), dorsum smooth (Fig. 3E) or sparsely setose (Fig. 2B); setae, if present, associated with micropunctures. Metathoracic wings present (Fig. 4A) in at least in two species (in. B. damgaardi not observed). Head transverse, eyes large (Fig. 2G), without interfacetal setae, dorsally not margined (Fig. 2I). Frons (Fig. 2G) about as long as length of an eye, emarginate around antennal insertions, lateral sides margined. Subantennal grooves shallow, extending behind eyes. Antenna consisting of ten antennomeres (Fig. 2I) with three apical forming distinct club (Fig. 3B). Terminal maxillary palpomere knife-like (cultriform) (Fig. 3F). Pronotum transverse (Fig.3C), disc with complete line separating anterior corners (Figs 3E, 4E), posterior and lateral margins bordered (Fig. 4E), anterior edge not margined. Prosternum with prominent chin-piece (Figs 2G, 3B), prosternal process about 0.6× as wide as procoxa. Elytral surfaces with fine punctures, with sutural line present along posterior half length (Figs 2E, 3D), epipleura reaching posterior border of ventrite 3, with bordering line reaching posterior margin of ventrite 2 (Figs 2A, 3A). Scutellar shield heart-like (Figs 3C, 4E). Mesoventral process transverse (Figs 2G, 4B), raised anteriorly. Metaventrite (Figs 2F, 3A) transverse, 1.5× longer than abdominal ventrite 1, mesometaventral junction arcuate anteriorly, discrimen visible in posterior half, metanpisternum with short, transverse sulcus near apical margin, postcoxal lines complete or incomplete laterally, straight or descending. Abdomen with six ventrites, ventrite 6 partially visible (Fig. 3A), ventrite 1 as long as ventrites 2 and 3 combined, postcoxal lines arcuate and incomplete laterally, accessory line long, often joining postcoxal line at apex forming v-shape (Fig. 4C). Legs slender with femora slightly swollen (Fig. 3A), tarsi with four tarsomeres (Fig. 2C), pretarsal claws barely appendiculate.
Etymology: First part of the name is derived from the Baltic Sea, the second refers to the genus Parasidis to which it is related.
KEY TO THE SPECIES OF BALTOSIDIS
1. Elytra covered with long erect setae (Fig. 2B), metaventral postcoxal lines slightly descending laterally (Fig. 2F), abdominal accessory line short, widely separated from postcoxal line (Fig. 2H ....... B. damgaardi
- elytra covered with short, indistinct setae or glabrous, metaventral postcoxal lines straight or slightly recurved, abdominal accessory line long, fused with postcoxal line or shortly separated in apical part ..... 2
2. Pronotum and elytra covered with fine setae (Fig. 4D, E), abdominal accessory line fused with postcoxal line, forming complete v-shape (Fig. 4C) ................................................................................... B. szadziewskii
- pronotum and elytra glabrous (Fig. 3C, E), abdominal accessory line does not reach postcoxal line, v-shape incomplete apically (Fig. 3G) ............................................................................................................ B. damzeni
description: Published as part of Szawaryn, Karol, 2021, The first fossil Microweiseini (Coleoptera: Coccinellidae) from the Eocene of Europe and its significance for the reconstruction of the evolution of ladybird beetles, pp. 1294-1309 in Zoological Journal of the Linnean Society 193 on pages 1298-1304, DOI: 10.1093/zoolinnean/zlaa180, http://zenodo.org/record/5752961