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Abstract
Two new species of Limnichidae beetles, Byrrhinusnegrosensissp. nov. and Byrrhinusvillarinisp. nov., are described from the Island of Negros in the Philippines. The adult specimens of the new species can be differentiated by patterns of body punctation, colour and orientation of elytral pubescence, posterolateral angle of pronotum, tarsomere length ratio and aedeagal form. Two clades, representing the two new species, were retrieved in the Maximum Likelihood gene tree using the 3’-end of the COI gene. Maximum genetic divergence within B.negrosensis sp. nov. and B.villarini sp. nov. were recorded to be 2.3% and 1.3%, respectively, while the mean interspecific divergence between the two new species was 19.7%. Morphological descriptions, digital photographs and COI sequences were provided for the two species. The state of knowledge of Byrrhinus is reviewed and an updated Philippine checklist is provided. By coupling morphological and molecular data, this paper provides the first additional new species of Philippine Byrrhinus in the last 28 years.
Highlights
Byrrhinus Motschulsky, 1858 is the most speciose limnichid genus with currently at least 87 species (Yoshitomi, unpublished data)
20% of known limnichid species belong to the genus Byrrhinus
Two clades were retrieved from the Byrrhinus specimens from Negros (Fig. 1), with each reciprocally monophyletic clade having representative specimens from two rivers about 200 km apart
Summary
Byrrhinus Motschulsky, 1858 is the most speciose limnichid genus with currently at least 87 species (Yoshitomi, unpublished data). 20% of known limnichid species belong to the genus Byrrhinus. The distribution of the genus is pantropical, but it is lacking or not yet recorded in some regions (Hernando and Ribera 2016). Byrrhinus is one of the two genera recorded in both the Old and New Worlds, notably absent in the Nearctic and Palearctic (Wooldridge 1987). The distinguishing features of Byrrhinus include its elongate oval habitus and deeply bisinuate pronotum and elytral base (Wooldridge 1987), as well as having a spiculum which can be dismantled from the male aedeagus (Hernando and Ribera 2014b). The internal anatomy was documented by Hinton (1939)
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