Some comments on the anatomy of spiders

This dataset contains the digitized treatments in Plazi based on the original journal article Palmgren, P. (1980): Some comments on the anatomy of spiders. Ann. Zool. Fennici 17: 161-173, URL: http://antbase.org/ants/publications/Palmgren1980/Palmgren1980.pdfIn Nephila clavipes (L.), N. maculata (Fabr.), Azilia affinis (O.P.-Cambridge) and Cyrlophora moluccensis (Doleschall) the anatomy of the musculature and of the intestinal caeca of the prosoma characterizes these spiders as typical Araneidae without any tetragnathid features.In Comaroma simoni Bertkau, classified by recent authors as a theridid, the tergo-coxal and endosterno-coxal musculature appear to be unique (three symmetrically arranged tergo-coxal muscles; no upper endosterno-coxal muscles). Dissection of Ceratinella brevis (Wider) (Micryphantinae), Cruslulina gallata (Wider), Steatoda bipunctata (L.), Dipoena tristis (Hahn) and Pholcomma gibbum (Westring), Theridiidae, suggests that the peculiarities of Comaroma cannot be interpreted as an adaptation to the strong sclerotization of the prosoma or as a general character of the smallest Theridiidae. The isolated taxonomic position of Comaroma is thus brought out. Comaroma lacks lungs and is perhaps related to the very heterogeneous Symphytognathidae complex.The anatomy of Psechrus argentatus (Doleschall) and two other Psechrus spp. (not determined with certainty), Psechridae, is described (prosoma and opisthosoma).