Sea lions are seals

My opponent argues many things. Yes, of course there are multiple ways to define and compare living organisms, but my opponent does not relate this to the central issue of this debate: Whether or not sea lions are seals. My opponent argues that species would be the best level for comparison as it is most specific. However, this debate isn't about what level is the best for comparison. This debate is about whether or not sea lions are seals. My opponent compares the categorization of species to categories of polygons. My opponent states that it would be a mistake to think "that all quadrilaterals are parallelograms." Perhaps my opponent intends to imply that, by the same token, it would be a mistake to think that all sea lions are seals. The implication, if it was intended, is incorrect. All sea lions indeed are seals as they are members of the family Otariidae. Sea lion is the sub-category; Seal is the encompassing category. With quadrilaterals are parallelograms, parallelogram is the sub-category, and quadrilateral is the encompassing category. I also do not understand my opponent's notion that we must emphasize on the level of species. This doesn't really make sense to me. All sea lions are animals. "Animals" is a substantially broader term than "seals", and no reasonable person would dispute that all sea lions are animals. I don't understand the relevance of my opponents discussion over misnomers and misconceptions because my opponent does not relate this discussion to the topic at hand. My opponents debate section C - "Sea lions and seals have some interesting differences" - is full of inaccurate information. First, I must point out that saying that sea lions and seals have interesting differences would be similar to saying that canines and coyotes have interesting differences. This is because sea lions are simply a type of seal in the same way that coyotes are a type of canine. Second, I must point out that walruses are not seals because walruses are not members of the family Otariidae nor Phocidae. Although both seals and walruses are pinnipeds, walruses are members of the family Odobenidae. [1] Pinnipedia is a suborder, not a family. [2] Third, I must criticize Con's source 9, http://nmlc.org... . It's a blog post written by someone named Brie Myre, and it's a bad source that's full of misinformation. Ms. Myre appears to have written her blog post while operating under the mistaken belief that "seal" simply means members of the family Phocidae while "sea lion" simply means members of the family Otariidae. Ms. Myre was wrong. Ms. Myre's notions fly in the face of every dictionary definition and encyclopedic reference provided in round 1. I don't know anything about Brie Myre, but I do know that this blog post is not as authoritative nor reputable as the sources I provided in round 1. I'll trust encyclopedias and dictionaries more than blog posts. My sources are more authoritative and reputable with regards to these particular assertions. Therefore, my sources should prevail. Lastly, I offer some direct support for C3 - "Sea lions are seals" [3][4][5][6][7][8] Sources - 1 - http://www.britannica.com... 2 - http://www.britannica.com... 3 - http://kids.britannica.com... 4 - https://goo.gl... 5 - https://goo.gl... 6 - https://goo.gl... 7 - https://goo.gl... 8 - https://goo.gl...