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Platyhelminthes (from the Greek πλατύ, platy, meaning "flat" and ἕλμινς (root: ἑλμινθ-), helminth-, meaning "worm") [4] is a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates commonly called flatworms or flat worms.
According to the book Flags Over California, published by the California Military Department, the star on the flag recalled the 1836 California Lone Star Flag. Todd, in an 1878 letter to the Los Angeles Express, states that the star was drawn using blackberry juice and in recognition of the California Lone Star Flag. The bear was designed to be ...
Description Year Image Source Amphibian: California red-legged frog Rana draytonii: 2014 [2] Animal: California grizzly bear Ursus arctos californicus: 1958 Bat: Pallid bat. Antrozous pallidus. 2024 [3] Bird: California quail Callipepla californica: 1931 [4] Colors: Blue and gold
The Turbellaria are one of the traditional sub-divisions of the phylum Platyhelminthes (flatworms), and include all the sub-groups that are not exclusively parasitic.There are about 4,500 species, which range from 1 mm (0.039 in) to large freshwater forms more than 500 mm (20 in) long [3] or terrestrial species like Bipalium kewense which can reach 600 mm (24 in) in length.
Planarians are bilaterian flatworms that lack a fluid-filled body cavity, and the space between their organ systems is filled with parenchyma. [5] [13] Planarians lack a circulatory system, and absorb oxygen through their body wall.
The etymology of the order name Polycladida corresponds to the two ancient Greek words πολύς (polús), meaning "numerous", and κλάδος (kládos), meaning "branch". [3] [4] It refers to the ramified shape of the intestine in these flatworms. [5] Most polyclads hide away from direct light.
Marine deep sea polychaetes under the genus Osedax will colonize at whale falls in many different oceans, using a symbiont that can digest the bones within the carcasses (Jones et al,2007) This earned them the common name of "boneworms," and they are speculated to be a keystone species of these types of environments due to lack of organisms in ...
Asexual reproduction by paratomy is common, and it usually leads to a chain of organisms , hence the name, from Latin catenula, small chain. [ 2 ] Members of the symbiotic genus Paracatenula lack a digestive tract , and instead harbor intracellular chemoautotrophic bacterial symbionts that are assumed to provide their nutrition.