A new species of Boholina (Crustacea, Copepoda, Calanoida) and a first record for stygobiotic calanoid fauna from a cave in Thailand

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.

Camelobaetidius guaycara, a new species of Baetidae (Ephemeroptera) from Costa Rica, Central America

The nymphs of a new species of Camelobaetidius (Ephemeroptera: Baetidae) possibly related to the South American species of this genus were found on the Atlantic and Pacific slopes of Costa Rica. Among other characteristics it is distinguished by having the anterodorsal arc of labrum with 1 + 6 setae, the first two frayed, ventrally 4 small setae near the lateral margin, and a minute seta near the anterior margin, on both sides of the cleft; the left mandible incisors with 6 denticles similar in size and the tip of the slender process extended at about the same level as the incisors; the paraglossa and glossa equal in length and a little shorter than segment II of labial palp, and a short triangular distomedial projection on segment II of labial palp; small nipple-like thoracic gills at base of forecoxa; claws with 27–32 denticles; posterior margin of abdominal terga with rounded spines; paraproct with 1–3 sclerotized spines, and cerci approximately 12% longer than the median filament. Both sexes present several different colorations. Some data on microhabitat preferences of nymphs are also given.