X. Leptura опять Asprotilapia

[janis]

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Though close to the catch-all genus Xenotilapia, Asprotilapiais sufficiently distinct from Xenotilapia to deserve being erected in a separate genus, characterized by it strongly specialized Labeo-like snout, typical of algae grazers. Nevertheless, (Takahashi, 2003) came to the conclusion that the whole Xenotilapia sub-group of Ectodines should be merged into only one genus. Yet, there are many quite distinctive genera in this subgroup, i.e. Microdontochromis with its minute teeth and plankton-eating ecology, or the mono-parental and polygynous Enantiopus. This conclusion was motivated by the fact that Takahashi failed to define true autapomorphies in Xenotilapia, which encompasses a bulk of species still in need to be studied and divided (at least into bi-parental and mono-parental species).

In cladistic taxonomy, a taxon must include all the descendant that stem from it, thus, as currently defined, Xenotilapia does not (it is then paraphyletic, constituting a 'plesion'). But since this too rigorous implementation of cladistics cannot always be met (taxa give birth to other taxa, not only in geological ages, but in present days, since there are whole species flocks descending from one species which still exists), and since the Xenotilapia subgroup of ectodines is by far too diverse for being restricted in a single genus, Takahashi's conclusions are not followed by most authors. Asprotilapia remains quite easily definable based upon its mouth shape and lifestyle, though it is obviously related to those members of Xenotilapia which form pair bonds, where both sexes take part in the incubation of the brood.

WIKIPEDIA

Клади́стика (от др.-греч. κλάδος (kládos) — ветвь) — направление филогенетической систематики. Характерные особенности кладистической практики состоят в использовании так называемого кладистического анализа (строгой схемы аргументации при реконструкции родственных отношений между таксонами), строгом понимании монофилии и требовании взаимно-однозначного соответствия между реконструированной филогенией и иерархической классификацией. Кладистический анализ — основа большинства принятых в настоящее время биологических классификаций, построенных с учётом родственных отношений между живыми организмами.

[janis]

также на свои места возвращены Microdontochromis Poll, 1986 и Enantiopus Boulenger, 1906