Pennella hawaiiensis Kazachenko & Kurochkin, 1974

Hogans, W. E., 2017, Review of Pennella Oken, 1816 (Copepoda: Pennellidae) with a description of Pennella benzi sp. nov., a parasite of Escolar, Lepidocybium flavobrunneum (Pisces) in the northwest Atlantic Ocean, Zootaxa 4244 (1), pp. 1-38 : 22-23

Pennella hawaiiensis Kazachenko & Kurochkin, 1974

( Fig. 11 )

Synonyms. None.

Type host and locality. Pentoceros richardsoni , south Pacific Ocean.

Morphology. Size: 80–90 mm. Papillae: partial coverage, generally spherical, variable in size and shape, not found in organized groups. Holdfasts: three, two laterals short; dorsal horn shorter. First antenna with four segments, second with two segments. Plumes: dendritic, complex branching.

Remarks. A valid species. Well described, figured and discussed in the original report. An intermediate size Pennella species parasitic on a unique host, the pelagic armourhead (boarfish), P. richardsoni . Kazachenko and Kurochkin (1974) documented several specimens of the adult female and younger pre-adult individuals in metamorphosis. Pennella hawaiiensis resembles P. filosa but is a smaller parasite; it also superficially resembles and is close in size to P. remorae , but has a different cephalothoracic papillae configuration, has one less segment on the first antenna, and parasitizes a much different type of host. Pennella hawaiiensis is the only species of Pennella other than P. exocoeti (a smaller parasite which does not possess a dorsal holdfast horn and is found on flyingfish) which exhibits a four-segmented first antenna.

Figures

FIGURE 11. Pennella hawaiiensis, a. habitus, old female; b. habitus, younger female; c. cephalothorax of young specimen, ventral; d. first antenna; e. second antenna; f. first swimming leg; g. second swimming leg; h. detail of abdominal plume (from Kazachenko & Kurochkin 1974). Scale bars: c = 0.1; d-f = 0.02 mm; g = 0.2 mm.