https://onlinelibrary.wiley.com/doi/abs/10.1002/ajpa.24594

Abstract

Objectives
Hominoid fossils are abundant at early Miocene fossil sites in the
Lothidok Range, located directly west of Lake Turkana in northern
Kenya. The West Turkana Miocene Project (WTMP) has worked in
the Lothidok Range since 2008 with the goal of further elucidating
the paleobiology of the hominoids through the recovery of new
specimens and detailed documentation of their paleoecological
context. To date our research has focused largely on the Kalodirr
and Moruorot Site Complexes, both radiometrically dated
to ~17.5–16.8 Ma.

Materials and Methods
Our ongoing fieldwork at the Kalodirr Site Complex resulted in the
discovery of new dentognathic specimens of the three previously
identified species of fossil hominoids—Turkanapithecus kalakolensis,
Simiolus enjiessi, and Afropithecus turkanensis.

Results
A new mandible and an isolated M3 of T. kalakolensis from Kalodirr further clarify the lower molar morphology of the species and permit identification
of KNM-MO 1 as a mandible of T. kalakolensis. A new mandible of S. enjiessi provides evidence of the relative proportions of the first and second lower molars. A new male specimen of A. turkanensis shows unusual P4
morphology that may be a developmental anomaly or a previously unknown morphological variant.

Discussion
An improved understanding of the lower molar morphology of T. kalakolensis further strengthens its identification as a nyanzapithecine. Our new
specimens
and subsequent re-identification of existing collections makes it clear
that all
three Lothidok hominoids are known from both the Moruorot and Kalodirr
Site Complexes. The Lothidok Range holds great promise for further
documenting hominoid evolution.

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Op zaterdag 17 september 2022 om 05:05:43 UTC+2 schreef Primum Sapienti:

https://onlinelibrary.wiley.com/doi/abs/10.1002/ajpa.24594

Thanks.
Note great & lesser apes split c 20 Ma, presumably in S.Asia, hominids & pongids c 15 Ma.

Additional hominoid fossils from the early Miocene of the Lothidok Formation, Kenya
James B Rossie & Susanne M Cote 2022 AJPA

Hominoid fossils are abundant at early-Miocene fossil sites in the Lothidok Range (directly W of Lake Turkana, N-Kenya).
WTMP (W.Turkana Miocene Project) has worked in the Lothidok Range since 2008, for further elucidating hominoid paleo-biology:
- recovery of new spms,
- documentation of their paleo-ecology.
To date, our research has focused largely on the Kalodirr & Moruorot Site Complexes (~17.5–16.8 Ma).

At the Kalodirr Site Complex, we discovered new dento-gnathic spms of the 3 previously identified fossil hominoid spps:
- Turkanapith.kalakolensis: a new mandible & isolated M3 further clarify the lower molar morphology,
they permit identification of KNM-MO-1 as a mandible of T.kalakolensis.
- Simiolus enjiessi: a new mandible provides evidence of the relative proportions of lower M1 & M2.
- Afropith.turkanensis: a new male spm shows unusual P4 morphology: developmental anomaly? previously unknown morphological variant?

An improved understanding of the lower molar morphology of T.kalakolensis further strengthens its identification as a nyanzapithecine.
Our new spms & subsequent re-identification of existing collections makes it clear:
all 3 Lothidok hominoids are known from both the Moruorot & Kalodirr Site Complexes.
The Lothidok Range holds great promise for further documenting hominoid evolution.

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