"I like the spelling "haemolymph" but that is just me" Peter
And, Peter, you might be wrong unless you are British.
General dictionaries interchange haeme and heme, and so we also find the same blurrying of terms in many articles on vertebrate blood.
However, for Arthropods, my USA-based insect physiology professors insisted that the proper name was hemolymph.
The vertebrate folks may casually interchange the spelling of terms, but the invertebrate specialists should not.
FYI, the Entomological Society of America has it's own Dictionary of terms. For example, general usage is honeybee. But ESA specifies honey bee as the proper common name - because there are lots of different bees - e.g., bumble bees, mason bees, leaf-cutter bees - why should the honey bee be singled out to be the honeybee.
Haeme refers to a deep red, iron-containing compound - which is the basis of oxygen transport. Each iron atom can bind and then release an oxygen molecule. However, one can also find it spelled as heme.
In Arthropods, copper atoms in hemocyanin bind oxygen. Hence the term hemo lymph. However, one will some times find this spelled as haemocyanin.
Bottom line, if you take our online bee course, it's hemolymph. Admittedly, I also adhere to 2 spaces after a period - drilled into me by my typing teacher since type-writers had fixed fonts. Word processors and adjustable fonts have negated the need, but my muscle-memory puts in the space and I still find it easier to read. Berekely Breathed and his re-boot of the Bloom County strip had Opus and Bill running for election against Trum - but the two needed a campaign slogan, something people would argue over, pay attention to: http://www.orchardwriting.com/blog/2015/9/25/bloom-county-and-the-madness-of-two-spaces-after-a-period
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