In contrast, all modern mymarids have unsegmented palpi. The first pair of antennae are small, usually unsegmented, and uniramous. Spines are generally stiff, sharp and unsegmented. This makes them applicable to tasks such as unsegmented, connected handwriting recognition or speech recognition. Their bodies are soft and unsegmented. Arthropods and annelids both have close relatives that are unsegmented. Likely, the axial skeleton consisted of an unsegmented notochord. The most general characteristic of molluscs is they are unsegmented and bilaterally symmetrical. They have no carapace or limbs, having only unsegmented sac-like bodies. This tissue derives from the unsegmented paraxial mesoderm and prechordal mesoderm. "C. elegans" is unsegmented, vermiform, and bilaterally symmetrical. "P. hermaphrodita" is unsegmented, vermiform, bilateral symmetrical pseudocoelomate. Unembryonated eggs (unsegmented) are passed in the feces of a previous host to the soil. The cerci are unsegmented and modified into large, forceps-like structures. The prosoma, or cephalothorax, is usually covered by a single, unsegmented carapace.