  We introduce new concepts and viewpoints on combinatorial Hopf species and
algebras. We give a category ${\rm \bf set_{\mathbb{N}}}$ whose objects are
sets, and (dualizable) morphisms represented by matrices of non-negative
integers. For a bimonoid species $(B,\Delta, \mu)$ in ${\rm \bf
set_{\mathbb{N}}}$ we may then dualize the product $\mu$ to get two intertwined
coproducts $\Delta, \Delta^\prime$. We consider restriction species
$\mathsf{S}$ over ${\rm \bf set_{\mathbb{N}}}$ accompanied by pairs of natural
transformations $\pi_1, \pi_2 : \mathsf{S} \rightarrow {\rm Pre}$ to the
species of preorders. A simple construction associates two comonoid species
$\Delta^1$ and $\Delta^2$, and we investigate when they are intertwined. We get
new Hopf algebras: i. choosing an arbitrary set of permutations without global
descents, we get associated a quotient Hopf algebra of the Malvenuto-Reutenauer
Hopf algebra of permutations avoiding this chosen set, ii. a Hopf algebra of
pairs of parking filtrations, and iii. three Hopf algebras of pairs of
preorders.
