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Table 1 Comparison of nomenclature of protocerebral pycnogonid brain centers/areas

From: The visual pathway in sea spiders (Pycnogonida) displays a simple serial layout with similarities to the median eye pathway in horseshoe crabs

Hanström [44, 51] Winter [52] Lehmann et al. [38, 53] This study
First-order VN (“Sehmasse”) First-order VN (“Sehmasse 1”) First-order VN 1 First-order VN
Second-order VN (“Sehmasse 2”) Arcuate body (second-order VN)
Corpora pedunculata First-order VN 2 Antero-median neuropil
Arcuate body Antero-median tract (part of)
Corpora pedunculata “Nebenlappen” Dorso-posterior lobe