Fig. 1

Exterior view of the thoracic skeleton of Troglophilus neglectus, legs removed. a Lateral view of left body side. The position of the dorsal cervical sclerite (dcv) is marked by the dashed line. (b), (c) Enlarged details of the cervical and thoracic pleural region as indicated in (a). d Dorsal view. e Ventral view. The white asterisk marks the invagination point of the prospina. The specimen figured in (a)–(d) is critical-point dried; the specimen depicted in (e) is dried with HMDS in an overstretched position to provide visibility of the cervical region. abst1/2, first/second abdominal sternum; absti1, first abdominal stigma; abt1, first abdominal tergum; amest2/3, anterior margin of mes-/metepisternum; cx1/2/3, pro-/meso-/metacoxa; dcv, dorsal cervical sclerite; em3, metepimeron; est1/2/3, pro-/meso-/metepisternum; fup1/2/3, furcal pit of pro-/meso-/metasternum; lcv, lateral cervical sclerite; ms, median sclerite; nt1/2/3, pro-/meso-/metanotum; pls3, metathoracic pleural suture; psb, pleuro-sternal bridge; spp2, mesospinal pit; st1/2/3, pro-/meso-/metasternum; sti2/3, meso-/metathoracal stigma; tcj2, trochantino-coxal joint of mesothorax; ti1/2/3, pro-/meso-/metatrochantin; tr3, metatrochanter. Scale bars: 1 mm