Abstract
A new species of Calanoida belonging to the genus Boholina Fosshagen & Iliffe, 1989 was found in a freshwater pool within a cave of the Satun province, South Thailand. It is the first record of the genus and of a stygobiotic representative of calanoid fauna in this country. The new species is most similar to B. crassicephala Fosshagen & Iliffe, 1989, based on position of genital pores, structures of P4 and P5 in both sexes, relative length of subapical spine vestige on the male right P5, and shape of the male left P5 endopods. However, this new species is distinguished from its known congeners by: (1) relatively longer distal outer spines on the male right P5 exopods, (2) smaller endopods of the male left P5 and (3) elongated apical spines on the distal exopodal segment of the female P4 and P5. Furthermore, the distinctive characteristic of the Thai Boholina is the presence of inner minute seta on the distal segment of the male right P5 exopod. Detailed descriptions of the new species and a key to all six known species of the genus Boholina is provided.
Highlights
The study of the Copepoda diversity in Southeast Asia is progressing rapidly due to an intensive program coordinated by Prof
The families Boholinidae and Ridgewayiidae were synonymised in the family Pseudocyclopidae by the morphology-based phylogenetic work of Bradford-Grieve et al (2014)
Calanoid copepods are ubiquitous in marine, brackish, and fresh waters, comprising 44 families and approximately 330 genera (Walter and Boxshall 2019)
Summary
Five species are recognised in this genus, only known from East and Southeast Asia (Fig. 1); they are B. crassicephala Fosshagen & Iliffe, 1989, and B. purgata Fosshagen & Iliffe, 1989, recorded from a pool in the San Vicente Cave on Bohol Island in the Philippines, B. munaensis Boxshall & Jaume, 2012 from a spring in Lawou Cave on Muna Island in Indonesia, B. parapurgata Boxshall & Jaume, 2012 from sinkholes on the coast of Muna Island, Indonesia, and B. ganghwaensis Moon & Soh, 2014 from the burrows of Cleistostoma dilatatum (De Haan, 1833) in the inter-tidal mudflat of Ganghwa Island, western Korea (Fosshagen and Iliffe 1989; Boxshall and Jaume 2012; Moon and Soh 2014). Distribution of the representatives of the genus Boholina: 1 B. crassicephala 2 B. purgata 3 B. parapurgata 4 B. munaensis 5 B. ganghwaensis 6 B. laorsriae sp. nov
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