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Each segment has several sets of ovaries and testes and produces very large numbers of eggs (probably more than the 700,000 a day produced by the beef tapeworm, Taenia saginata). [4] In one study by the Russian zoologist A. Skryabin, who described T. calyptocephalus in 1961, the largest proglottids were 5 cm (2 in) wide and contained fourteen ...
Diadectomorpha is a clade of large tetrapods that lived in Euramerica during the Carboniferous and Early Permian periods and in Asia during Late Permian (Wuchiapingian), [1] They have typically been classified as advanced reptiliomorphs (transitional between "amphibians" sensu lato and amniotes) positioned close to, but outside of the clade Amniota, though some recent research has recovered ...
An anal fissure is a break or tear in the skin of the anal canal. Anal fissures may be noticed by bright red anal bleeding on toilet paper and undergarments, or sometimes in the toilet. If acute they are painful after defecation , [ 1 ] but with chronic fissures, pain intensity often reduces and becomes cyclical.
The tetrapods, including all large- and medium-sized land animals, have been among the best understood animals since earliest times. By Aristotle's time, the basic division between mammals, birds and egg-laying tetrapods (the "herptiles") was well known, and the inclusion of the legless snakes into this group was likewise recognized. [28]
[18] [19] Tetrapods can be divided into four classes: amphibians, reptiles, birds and mammals. Marine tetrapods are tetrapods that returned from land back to the sea again. The first returns to the ocean may have occurred as early as the Carboniferous Period [ 20 ] whereas other returns occurred as recently as the Cenozoic , as in cetaceans ...
With anal sex, the anus can play a role in sexuality. Attitudes toward anal sex vary, and it is illegal in some countries. [5] The anus is often considered a taboo part of the body, [5] and is known by many, usually vulgar, slang terms. Some sexually transmitted infections including HIV/AIDS and anal warts can be spread via anal sex.
A humpback whale that is missing its tail and was spotted in Washington state's inland waters likely lost its iconic flukes after becoming entangled, possibly in some kind of line or fishing gear ...
The anal and posterior dorsal fin supported by a basal plate and three unjointed radials. The pectoral fin skeleton is composed of bones homologous to the tetrapod humerus , ulna , and radius , followed by a host of smaller bones anchoring the fin rays; the pelvic fin skeleton similarly has femur , tibia , and fibula .