Parastenhelia willemvervoorti sp. nov.

urn:lsid:zoobank.org:act: D4B6BA49-5E4C-4021-A57E-B6F4B35CA973

Original description. Vervoort (1964): 181, 184–188; Figs. 66a–b (♂ – from locality 590), 68a–c (♀ – from locality 589), 69a–f (♂ – from locality 590) [as Parastenhelia spinosa].

Type material. The dissected male specimen illustrated by Vervoort (1964: 181, 187) in his figures 66 (a–b) and 69 (a–f) and collected on 16 October 1953 is here designated as the holotype of P. willemvervoorti sp. nov. (ICZN Arts 16.4 and 72.5.6). The species can be differentiated by the characters listed in the diagnosis below and those mentioned and illustrated in Vervoort (1964) (ICZN Art. 13.1).

Type locality. Federated States of Micronesia, Caroline Islands, Ifalik (Ifaluk) Atoll; seaward reef about middle of Falarik. Vervoort (1964) collected males from two different stations (589 and 590). The male holotype came from station 590 (sand sample taken about 24 m from reef margin) .

Differential diagnosis. Parastenhelia . Body length 290–470 μm in ♀, 270–650 μm in ♂. Rostrum as long as antennulary segments 1–2 combined. Antennule 8-segmented in ♀; haplocer in ♂ but segmentation unconfirmed, with three segments distal to geniculation. Antenna with 2-segmented exopod bearing two setae on exp-1 and one lateral and three apical elements on exp-2. P1 exopod about 0.6 times length of endopod; exp-2 not elongate, slightly longer than exp-3. P1 enp-1 about 1.5 times length of exopod. P3–P4 exp-1 without inner seta, exp-3 with three inner setae. P2 endopod ♂ 2-segmented; enp-2 elongate, reaching apex of exopod, with additional inner seta [1.221 vs 1.1. 121 in ♀]. P3 endopod ♂ 3-segmented, with apophysis on enp-3, armature pattern [1.1.02 + apo]; P4 endopod ♂ 3-segmented, with only one inner seta on enp-3 [1.1.121 vs 1.1. 221 in ♀]. Armature of P1–P4 – see Table 1. P 5 ♀ with elongate exopod (about 2.5 times as long as wide), with six elements; armature of endopodal lobe unknown. P 5 ♂ 2-segmented, with one outer seta on exp-1 and six elements on exp-2; endopodal lobe with two elements. P 6 ♂ with three setae. Anal operculum smooth. Caudal ramus seta IV– V ♀ not swollen at base .

Etymology. The species is named after the late Prof. Willem Vervoort (12 June 1917 – 18 August 2010), eminent copepodologist, who discovered this species.