Johnwellsia, a new intertidal genus of Parastenheliidae (Copepoda, Harpacticoida) from the Taiwan Strait, China, including a review of the family and key to generaAuthorHuys, Rony0000-0003-2411-7003Department of Life Sciences, The Natural History Museum, Cromwell Road, London SW 7 5 BD, U. K.r.huys@nhmAuthorMu, Fanghong0000-0002-6172-9271College of Marine Life Science, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.textZootaxa20212021-10-1250511236318https://doi.org/10.11646/zootaxa.5051.1.13journal article397910.11646/zootaxa.5051.1.13a82cb38a-03d5-4d23-845c-4365295426791175-53265572417F94203E7-FCD1-4975-BAD3-0DF534806712Penicillicarisgen. nov.
urn:lsid:zoobank.org:act:
4F1EBA1D-4DA5-4B08-B561-455664FC3C86
Ever since the discovery and description of
Thalestris pectinimanaCar, 1884
, the presence of penicillate elements on the antennary endopod and the distal exopodal and endopodal segments of P
1 in
various related forms (
Scott 1894a
;
Brian 1921
;
Monard 1928
;
Willey 1935
;
Sewell 1940
;
Bodin 1964
;
Vervoort 1964
) has been uncritically accepted as part of the documented variability allegedly displayed by
Parastenhelia spinosa
(
Lang 1948
and others) and unfortunately did not receive the attention it deserved.
Sewell (1940)
for example, claimed that
Monard’s (1928)
penicillate form from Banyuls-sur-Mer referred to
Parastenhelia littoralis
while his own material from
Bermuda
listed under the latter name cannot possibly be conspecific with the species described by
Sars (1911)
. A new genus,
Penicillicarisgen. nov.
, is proposed here to accommodate four forms that had previously been subsumed in the
Parastenhelia spinosa
complex and are attributed full species rank.Another three forms are placed with reservations in the genus as
species inquirendae
:
Microthalestris forficula
(
Claus, 1863
) sensu
Scott (1894a)
,
M. littoralisSars, 1911
sensu
Brian (1921)
and
M. littoralisSars, 1911
f
.
scotti
sensu
Sewell (1940)
.
A number of records refer to the penicillate form but are not accompanied by illustrations. Such indeterminable records include those from Visakhapatnam (formerly Waltair),
Andhra Pradesh
in
India
(
Krishnaswamy 1957
– as
Parastenhelia littoralis
f.
pencillata
[
sic
]), Dalkey Island and The Muglins, Co.
Dublin
(
Roe 1958
) and Lough Hyne (Ine), Co.
Cork
(
Roe 1960
;
Sloane
et al.
1961
) in
Ireland
(all
P. spinosa
f.
penicillata
), and Rovinj in
Croatia
(
Zavodnik 1969
– as
P. spinosa
var.
penicillata
).
Diagnosis.Parastenheliidae
. Sexual dimorphism in antennule, P3 endopod, P5–P6 and urosomal segmentation; occasionally in P4 endopod (
Pe.
penicillatasp. nov.
). Body subcylindrical; condition of hyaline frills of cephalothorax and somites unconfirmed. Rostrum defined at base, reaching at most to halfway second segment of antennule; linguiform. Anal operculum semicircular, bordered with fine setules. Caudal ramus wider than long, without conspicuous spinular ornamentation; with at least six setae, setae IV–V typically inflated at base in
♀
.
Antennule
♀
slender and typically 8-segmented (occasionally 9-segmented), with aesthetascs on segments 4 and 8 (or 9). Antennule
♂
haplocer and presumably 10-segmented; with geniculation between segments 6 and 7, and four segments distal to geniculation; segment 5 swollen and with aesthetasc; segmental homologies in
♂
: I, II–
VIII
,
IX
–
XII
,
XIII
,
XIV
–
XVIII
,
XIX
–
XX
,
XXI
–
XXII
,
XXIII
,
XXIV
–
XXV
,
XXVI
–
XXVIII
. Antenna not sexually dimorphic; allobasis completely fused or partially divided, with endopodal pinnate seta on abexopodal margin; exopod 2-segmented, proximal segment with two setae, distal segment with 1–2 lateral and three apical elements; free endopod with two penicillate elements. Mandible with 2 elements on basis; endopod with two lateral and 3–4 apical setae; exopod 1-segmented, with two setae. Maxillulary coxal epipodite and maxilla unconfirmed. Maxilliped with 0–1 seta(e) on syncoxa; basis with one seta on palmar margin; endopod represented by claw with unconfirmed number of accessory setae
.
P1 inner basal spine not sexually dimorphic. P1 exopod 3-segmented; exp-2 elongate and much longer than others, with inner seta; exp-3 with two penicillate spines, a geniculate seta or additional penicillate spine, and one non-geniculate seta. P1 endopod 2-segmented; enp-1 longer than exopod, with short, proximally inserted, pinnate inner seta, inner segment margin without area of reduced chitinization; enp-2 with one naked minute seta and two penicillate claws. P2–P4 rami typically 3-segmented, P2–P3 endopods
♀
occasionally 2-segmented (
Pe.
penicillatasp. nov.
); inner seta of P2–P4 exp-1 reduced in size. P3 endopod
♂
3-segmented; enp-3 with spinous apophysis and no inner setae. P4 endopod
♂
occasionally without inner setae on enp-3 [1.1.021; in
Pe.
penicillatasp. nov.
]. Armature formula of P2–P4 as follows:
exopod
endopod
P2
1.1.123
1.1.121 or 1.221
P3
1.1.(2–3)23
1.1.221 or 1.321 [♂: 1.1.02 + apo]
P4
0–?1.1.(2–3)23
1.1.(1–2)21
P
5 ♀
endopodal lobe with five setae; inner margin without series of transverse striae. P
5 ♀
exopod elongate, with six elements. P
5 ♂
endopodal lobe with two elements, outer one typically shortest; exopod 1-segmented, with seven elements. P6 unconfirmed in both sexes.
Etymology.
The generic name is derived from the Latin
penicillus
, meaning paintbrush, and the Greek suffix
-caris
, meaning shrimp, and refers to the presence of penicillate spines on the antennary endopod and both rami of the first swimming leg. Gender: feminine.
Type
species.
Thalestris pectinimanaCar, 1884
=
Penicillicaris pectinimana
(
Car, 1884
)
comb. nov.
(by original designation herein).
Other species.P. maldivensissp. nov.
;
P. penicillatasp. nov.
;
P. sewellisp. nov.
Species inquirendae.
Microthalestris forficula
sensu
Scott (1894a)
;
M. littoralisSars, 1911
sensu
Brian (1921)
;
M. littoralisSars, 1911
f
.
scotti
sensu
Sewell (1940)
.