Talk:Twin

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Quaternary mention?

I not only didn't see any mention of non-communal "quaternary marriages" mentioned in this article, I couldn't find a single mention anywhere on wikipedia. Could quaternary marriages be mentioned or even have its own article? I learned about it earlier today in the letter section of Popular Science and this was basically the only worthwhile web reference I could find outside of discussion about group marriages: [1]

Citation 19 is a dead link

Wiki Education assignment: BIO 378 Developmental Biology

Terminology for individuals

Regarding this passage from the opening of the article: "In contrast, a fetus that develops alone in the womb (the much more common case, in humans) is called a singleton, and the general term for one offspring of a multiple birth is a multiple. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgängers."

Singleton: there was one post to talk years back that brought into question use of this term. However, it appears in the scientific literature, such as in PMID 10442325, a clinical paper that has in the Abstract (Study design section) "...data on all women with singleton and twin gestations complicated by PROM...." This type of usage suggests the use of "singleton" for a child of a singleton pregnancy, just like below for "twin" for a child of a twin pregnancy.
Multiple: I've been trying to find use of this term. The more common approach than using "multiple" is to refer using a derivative of the common multiplicity term. So, in the case of twins, an individual is referred to as a "twin" (Dorlands, 28th edition 2009, pg. 877), "triplet" for a triplet birth (pg. 869), "quadruplet" for one person from a quadruple pregnancy (pg. 705), "quintuplet" (pg. 705), "sextuplet" (pg. 758), "septuplet" (pg. 756) — which is as far as the dictionary goes. The text has terms for multiple pregnancies (multigravida and multipara), but these terms refer to multiple different pregnancies and not to a multi-birth pregnancy. Also, the current citation to a MedLinePlus article only alludes to the use of the term multiple and doesn't actually define it.
Dopplegangers: the supporting citation related to a "generalized user modeling system" which has this name. I would suggest dropping this particular sentence altogether.

I can do the rewrite and re-citationing of the passage, but wanted to see if the concept passed muster here first. --User:Ceyockey (talk to me) 23:05, 7 April 2022 (UTC)[reply]