Endoskeleton three phyla and one subclass of animals, endoskeletons of various complexity are found: Chordata, Echinodermata, Porifera, and Coleoidea. An endoskeleton may function purely for support (as in the case of sponges), but often serves as an attachment site for muscle and a mechanism for transmitting muscular forces. A true endoskeleton is derived from mesodermal tissue. Such a skeleton is present in echinoderms and chordates. The poriferan 'skeleton' consists of microscopic calcareous or siliceous spicules or a spongin network. The Coleoidae do not have a true endoskeleton in the evolutionary sense; there, a mollusk exoskeleton evolved into several sorts of internal
Phyla nodiflora look, which is why the plant is sometimes called matchweed. It is similar to the related species Phyla lanceolata, but differs in having much shorter leaves that are often blunt and much more rounded. Both species are common as weeds and in the ornamental environment. Common names in India include bukkan (Hindi), ratolia, vakkan (Marathi), podutalai (Tamil), vasir, and vasuka (Sanskrit). It is used medicinally to treat suppuration, common colds, and lithiasis. "Lippia canescens" Kunth, "Lippia incasiomalo" (Small) Tildsoan, "Lippia lickiflora" (L.) Michx., "Lippia nodiflora" var. "canescens" (Kunth) Kuntze, "Lippia nodiflora" var. "reptans" (Kunth) Kuntze, "Lippia nodiflora" var. "rosea" (D.