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Table 1 Overview of species, postembryonic stages and number of specimens analyzed in the course of this study

From: Comparison of ventral organ development across Pycnogonida (Arthropoda, Chelicerata) provides evidence for a plesiomorphic mode of late neurogenesis in sea spiders and myriapods

Species

Family

# scanned & analyzed specimens

penultimate postlarval instar

last postlarval instar

1st juvenile instar

later juvenile instar

Phoxichilidium femoratum

(Rathke, 1799)

Phoxichilidiidae

1

31

12

Tanystylum orbiculare

Wilson, 1878

Ammotheidae

4

5

4

1

Meridionale sp.

(“variabilis” complex sensu Arango & Brenneis, 2013 [45])

Callipallenidae

6

Callipallene brevirostris

(Johnston, 1837)

Callipallenidae

6

Stylopallene cheilorhynchus

Clark, 1963

Callipallenidae

5

1

Pycnogonum litorale

Strøm, 1762

Pycnogonidae

8

5

1