https://zookeys.pensoft.net/article/22814/

Trematocranus pachychilus, a new endemic cichlid from Lake Malawi (Teleostei, Cichlidae)

Authors

Katrien Dierickx1, Mark Hanssens1, Bosco Rusuwa2, Jos Snoeks1,3

1 Ichthyology, Section Vertebrates, Department Biology, Royal Museum for Central Africa, Tervuursesteenweg 13, B-3080 Tervuren,
Belgium
2 Department of Biology, Chancellor College, University of Malawi, Zomba, Malawi
3 Laboratory of Biodiversity and evolutionary genomics, Leuven University (KU Leuven), Charles Deberiotstraat 32, B-3000 Leuven,
Belgium
Corresponding author: Katrien Dierickx (katrien.dierickx@africamuseum.be)
Academic editor: N. Bogutskaya  |  Received 6 December 2017  |  Accepted 8 February 2018  |  Published 14 March 2018
http://zoobank.org/0D0C4DE4-0DDB-4A9C-B879-F4DA4FD98D14
Citation: Dierickx K, Hanssens M, Rusuwa B, Snoeks J (2018) Trematocranus pachychilus, a new endemic cichlid from
Lake Malawi (Teleostei, Cichlidae). ZooKeys 743: 153–166. https://doi.org/10.3897/zookeys.743.22814



Figure 5.
Photographs of preserved specimens: A Trematocranus pachychilus, holotype, MRAC 99-041-P-4781, adult male, 154.6 mm SL, Lake Malawi, Jafua Bay B T. microstoma, MRAC 99-041-P-4787, 143.7 mm SL, Lake Malawi, Mazinzi Bay C T. placodon, MRAC 99-041-P-4776, 153.8 mm SL, Lake Malawi, Jafua Bay D T. placodon, MRAC 99-041-P-4798, 149.3 mm SL, Lake Malawi, Senga Bay. Scale bar: 2 cm.

Abstract

A new species of Trematocranus, T. pachychilus sp. n., is described from Lake Malawi. So far, it has only been found at Jafua Bay, Mozambique. It can easily be distinguished from T. labifer by its molariform pharyngeal dentition. A morphometric study, including 24 measurements and 15 counts, was done to compare the new species with T. microstoma and T. placodon. Trematocranus pachychilus is characterised by its thick lips. This species further differs from T. microstoma by its bicuspid (vs. unicuspid) outer oral teeth, wide (vs. small) pharyngeal bone, and its head shape. It resembles T. placodon, from which it can be distinguished by its straight to concave head profile (vs. rounded), less-developed pharyngeal bones (vs. hypertrophied), and the presence of small to minute teeth on the lateral parts of the dentigerous area on the lower pharyngeal bone. A key to the species of Trematocranus is provided.

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