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Spider embryogenesis is affected by a range of environmental factors. Any sudden, drastic change in the environment may impair spider development, leading to various body deformities. In the present study, we analyze changes in the morphology and structure of the central nervous system of an  Eratigena atrica  larva, obtained in a teratological experiment in which embryos were exposed to alternating temperatures of 14 and 32 °C for the first 10 days. The studied larva had three pedipalps on the right side of the prosoma (polymely), two of which were fused along their entire length (total heterosymely). In addition, there was a short, club-shaped stump between the pedipalps. Histological analysis confirmed major changes in the structure of the subesophageal ganglion, i.e., the fusion of all three ganglia of pedipalps.

Morphology and the central nervous system of Eratigena atrica affected by a complex anomaly in the anterior part of the prosoma