DOI: 10.5061/dryad.7g1m9
title: Data from: Ontogeny of the articulated yiliangellinine trilobite Zhangshania typica from the lower Cambrian (Series 2, Stage 3) of southern China

description: New discoveries of the early Cambrian yiliangellinine trilobite
 Zhangshania typica Li and Zhang in Kunming preserve almost all instars
 from early postembryonic (protaspid) to mature (holaspid) phases in
 articulated state, in addition to mature specimens with antennae bearing
 paired spines on the basal articles. The ontogenetic series shows
 protarthrous development with some, but likely not all, early holaspid
 instars expressing additional pygidial segments, gradual rearward
 migration of the location of the longest pleural spines on the trunk
 segments, and striking positive allometry of the genal spines. It also
 reveals Parazhangshania sichuanensis Li and Zhang, 1990 to be the holaspid
 stage 3 of Z. typica, and therefore its junior synonym. This new find in
 the Hongjingshao Formation provides species-based regional correlation
 across the South China block and Z. typica may provide an important
 biostratigraphic marker for the base of the traditional Tsanglangpuan
 Stage.
description: Houetal_Supplementary
 Data 1Supposed protaspid and
 meraspides of Zhangshania typica from the Hongjingshao Formation, in
 Kunming, Yunnan Province, southern China: (1), supposed protaspid of this
 species, YKLP 12249; (2), same specimen of YKLP 12249 photographed under
 different lighting; (3), Meraspid degree 2, YKLP 12250; (4), enlargement
 of pygidium of specimen YKLP 12250; (5), Meraspid degree 3, YKLP 12251;
 (6), enlargement of pygidium of specimen YKLP 12251. p, pygidial segment;
 t, thoracic segment. Same abbreviations seen below. Scale bars are (1, 2,
 4, 6) 200 µm; (3, 5) 500 µm.HouetalSupplementaryData1_2col.tifHouetal_Supplementary Data 2Meraspides of Zhangshania typica from the Hongjingshao Formation, in Kunming, Yunnan Province, southern China: (1), Meraspid degree 4, YKLP 12252; (2), enlargement of cephalon of specimen YKLP 12252; (3), enlargement of pygidium of specimen YKLP 12252; (4), Meraspid degree 5, YKLP 12253;(5), Meraspid degree 6, YKLP 12254; (6), enlargement of pygidium of specimen YKLP 12254; (7), Meraspid degree 7, YKLP 12255; (8), enlargement of pygidium of specimen YKLP 12255; (9), Meraspid degree 8, YKLP 12256; (10), enlargement of pygidium of specimen YKLP 12256; (11), Meraspid degree 9, YKLP 12257; (12), enlargement of pygidium of specimen YKLP 12257. Scale bars are (3, 6, 8, 10, 12) 200 µm; (1–2, 4–5) 500 µm; (7, 9, 11) 1.0 mm.HouetalSupplementaryData2_2col.tifHouetal_Supplementary Data 3Meraspides and early holaspides of Zhangshania typica from the Hongjingshao Formation, in Kunming, Yunnan Province, southern China: (1), Meraspid degree 10, YKLP 12319; (2), Meraspid degree 11, YKLP 12259; (3), Meraspid degree 12, YKLP 12260; (4), Meraspid degree 13, YKLP 12261; (5), enlargement of pygidium of specimen YKLP 12261; (6), Holaspid stage 1, YKLP 12262; (7), enlargement of pygidium of specimen YKLP 12262; (8), Holaspid stage 2, YKLP 12263; (9), enlargement of pygidium of specimen YKLP 12263. Scale bars are (5, 7, 9) 200 µm; (1–3) 500 µm; (4, 6, 8) 1.0 mm.HouetalSupplementaryData3_2col.tif