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In the recent description of two new Longipedia species from Korea [...]

Both genders of Tigriopus thailandensis sp. nov. are described from a laboratory stock raised from individuals collected from the seaweed Enteromorpha clathrata in Thailand (Bangsaen Beach, Chonburi Province). Tigriopus thailandensis sp. nov. shares with its closest relative T. japonicus Mori, 1932 two setae on the third exopodal segment of leg 4 while other congeners bear 3 inner setae. However, allobasis and exopod of antenna in both genders are much more slender and elongate than in T. japonicus. All six naupliar stages of T. thailandensis are described from the offspring of isolated females. In comparison with nauplii of T. japonicus, T. thailandensis nauplii are characterized by the following: a smaller body size throughout the naupliar phase; first antennular segment without seta, second antennular segment with only one small seta plus two longer setae; third antennular segment with additional spinules from naupliar stage II onwards; antenna bears three small spinules on the terminal exopodal segment; one additional seta on the anterior surface of the antennary basis, tubular endopod of antenna with one tiny seta midlength at naupliar stage III that increases in size; mandibular basis with several spinules on anterior surface; mandibular coxa with one spinulose seta that is smooth in T. japonicus.

Tisbe thailandensis sp. nov. is described in particular detail from a laboratory stock raised from individuals collected from Bangsaen Beach, Thailand. The description has revealed the following autapomorphic characters: the spiniform terminal seta of P1 Enp III bears a spinule row on anterior face; the innermost seta carries at the outer tip a tuft of spinules; the outermost seta has along its outer border short but stiff spinules; there are large surface spinules on the anterior face of female P5 exp and baseoendopod and male P5 exp. A phylogenetic inference study provides a most parsimonious hypothesis of relationships. The branching pattern indicates that Tisbe thailandensis sp. nov. is the most underived taxon compared to the remaining Tisbe species analyzed here. It confirms that T. furcata shares several characters with a number of species that justifies uniting them in a T. furcata group. According to the present analysis, the furcata group contains the following species: T. bocqueti, T. furcata, T. variana, T. carolinensis, and T. bulbisetosa. The male dimorphic maxilliped and the long spinule at the tip of the middle (terminal) spiniform seta of the male P5 exp are no longer constitutive for the furcata group of species since they are present also in other species.

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All six naupliar stages of the harpacticoid copepod Zaus wonchoelleei Kangtia, Dahms, Song, Myoung, Park & Khim, 2014 are described. A key for the identification of the naupliar stages is provided. Stages can be distinguished by number of segments of the exopod of antenna 2, setation of the limbs including the bud of the caudal ramus, and presence and setation of the bud of maxilla 1. In phylogenetic reconstructions there are several characters which link two taxa of different harpacticoid groups, the Harpacticidae of Exanechentera and the Thalestridae of Podogennonta. The Harpacticidae and the free-living genera of the Thalestridae develop from a 3-segmented naupliar antennular precursor in Harpacticidae and a 1-segmented antennule in Thalestridae to a 6-segmented antennule at copepodid I. Both families also share a single, stout spine terminally on the inner process of the mandibular naupliar endopodite which is unique for harpacticoid nauplii. A peculiar medial bifid seta on the antennal basis at nauplius I and II is also unique. This seta is replaced by a medial seta of the coxa at nauplius III, which has the same structure as the aforementioned set which gets reduced.