A New Legless Loam-swimming Lizard (Reptilia: Squamata: Scincidae: Genus Brachymeles) from the Bicol Peninsula, Luzon Island, Philippines
A new limbless species of scincid lizard of the genus Brachymeles is described from Mt. Labo, Bicol Peninsula, Luzon Island, Philippines. The species was encountered only on this isolated volcanic peak and is conspicuously absent from surrounding, well-surveyed regions of the Bicol Peninsula. The new species is the fourth known limbless species of Brachymeles and the third to be discovered in the Philippines. It is the second longest limbless species of Brachymeles, and, aside from size, can be distinguished from all congeners by features of its external morphology, including both color and scalation. The discovery brings the total number of known Brachymeles species in the Luzon Faunal Region to eleven, including two limbless forms. Isang panibagong uri ng mga bubuling Brachymeles na walang mga paa ang isinalarawan mula sa bundok ng Labo, sa timog-hilagang Luzon, sa Pilipinas. Ang Brachymeles na ito ay matatagpuan lamang sa isang liblib na kabundukan sa Camarines Norte ng Kabikolan. Ito ay pang-apat lamang sa mga walang paang uri ng Brachymeles sa buong mundo at pangatlong natuklasan sa Pilipinas. Ito rin ang pumapangalawa sa haba ng katawan sa mga kauri nitong walang mga paa. Maliban sa sukat ng pangatawan, ito ay makikilala rin mula sa mga kauri nito sa taglay nitong mga katangian sa anyong panglabas, kulay, at pangaliskis. Sa pagkatuklas ng Brachymeles na ito, umabot na sa labing isa ang mga Brachymeles mula sa Luzon Faunal Region, at sa dalawa ang uring walang mga paa na makikita rito.Abstract

Known distribution of Brachymeles lukbani on Mt. Labo, Bicol Peninsula, Philippines. The inset shows the location of Luzon Island (colored in dark gray) within the Philippines. The type locality of the new species (Mt. Labo, Barangay Tulay Na Lupa, Municipality of Labo, Camarines Norte Province, Luzon Island) is indicated by a black circle, and the type locality of B. minimus on Catanduanes Island is indicated by a black square.

Illustration of head of female holotype of Brachymeles lukbani (PNM 9567) in dorsal, lateral, and ventral views. Taxonomically useful head scales within Brachymeles are labeled as follows: C, chin shield; F, frontal; FN, frontonasal; FP, frontoparietal; IL, infralabial; IP, interparietal; L, loreal; M, mental; N, nasal; P, parietal; PF, prefrontal; PM, postmental; PN, postnasal; PO, preocular; PSO, presubocular; R, rostral; SC, supraciliary; SL, supralabial; SN, supranasal; and SO, supraocular. Roman numerals indicate scales in the supraocular series, with numbers indicating scales in the supraciliary series.

Photograph in life of Brachymeles lukbani paratype (PNM 9590 = RMB 9672), male, SVL = 80.7 mm. Photographs by R. M. Brown.
Contributor Notes
Associate Editor: T. W. Reeder.