Microthalestris variabilis
- Dataset
- Johnwellsia, a new intertidal genus of Parastenheliidae (Copepoda, Harpacticoida) from the Taiwan Strait, China, including a review of the family and key to genera
- Rank
- SPECIES
- Published in
- Huys, Rony, Mu, Fanghong (2021): Johnwellsia, a new intertidal genus of Parastenheliidae (Copepoda, Harpacticoida) from the Taiwan Strait, China, including a review of the family and key to genera. Zootaxa 5051 (1): 236-318, DOI: 10.11646/zootaxa.5051.1.13, URL: https://doi.org/10.11646/zootaxa.5051.1.13
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Hexanauplia
- order
- Harpacticoida
- family
- Miraciidae
- genus
- Microthalestris
- species
- Microthalestris variabilis
description
Original description. Mielke (1990): 158 – 164, Figs 1 – 5.
diagnosis
Differential diagnosis. Microthalestris. Body length 580 – 780 μm in ♀, 420 – 560 μm in ♂. Antenna with 2 - segmented exopod bearing two setae on exp- 1 and two lateral and three apical elements on exp- 2; endopod without penicillate spines. P 1 exopod about 70 % length of endopod; exp- 2 elongate, about 1.8 times as long as exp- 1, and about 40 % length of enp- 1; insertion point of inner seta of enp- 1 at 40 % of inner margin length; exp- 3 with two unipinnate spines and two geniculate setae; enp- 2 with one minute seta, one geniculate and one non-geniculate claw. Armature pattern of ♀ P 2 – P 4: P 2 endopod ♂ 2 - segmented (enp- 2 and - 3 forming compound segment), armature pattern [1.221]. P 3 endopod ♂ 3 - segmented, with apophysis on enp- 3, armature pattern [1.1.02 + apo]. P 5 ♀ with ovate exopod (about 1.9 times as long as maximum width), with six elements, distal outer one longest, outer apical one short and naked; endopodal lobe with five elements, innermost one well developed. P 5 ♂ exopod 3 - segmented, with seven elements, outer seta of exp- 1 long and naked; endopodal lobe with two short spiniform elements. Armature of P 6 ♂ unconfirmed. Caudal ramus seta V normally developed, seta IV with bulbous swelling near base.
etymology
Etymology. The species name alludes to the high level of variability observed in the swimming leg armature.
materials_examined
Type material. The dissected female specimen illustrated by Mielke (1990: Figs 1 – 3, 4 A, 5) is here designated as the holotype of P. variabilis sp. nov. (ICZN Arts 16.4 and 72.5.6). The species can be differentiated by the characters mentioned in the diagnosis below and those illustrated by Mielke (1990) (ICZN Art. 13.1). Type locality. Argentina, Province of Tierra del Fuego, Antarctica and South Atlantic Islands; Isla Grande Tierra del Fuego, Bahía Lapataia near Ushuaia.
Name
- Synonyms
- Microthalestris gracilis (Brady 1910)
- Homonyms
- Microthalestris variabilis