Additions to the Indonesian fauna of the hermit crab genus Pseudopaguristes McLaughlin and a further division of the genus Paguristes Dana (Crustacea: Decapoda: Paguroidea: Diogenidae)AuthorRahayu, Dwi ListyotextZootaxa2005831142journal article10.5281/zenodo.170654bd4d8563-282e-4228-a376-aa9b609566e311755326170654
Genus
StratiotesThomson, 1899StratiotesThomson, 1899
: 185
.
Type
species.
Stratiotes setosusThomson, 1899
, junior subjective synonym of
Pagurus setosus
H.
Milne Edwards, 1848
.
Diagnosis.
Twelve pairs of bi or quadriserial gills; no pleurobranch on fifth or eighth thoracic somites. Shield well calcified, with rostrum well developed or reduced. Ocular acicles well developed or reduced, simple, bi or multidenticulate. Antennal peduncle with supranumerary segmentation; acicles elongate, spinose or spinulose. Mandible with unarmed mesial margin, palp often indistinctly 3segmented. Maxillule with external lobe of endopod prominently recurved. Maxilla with elongate endopod. First maxilliped with well developed epipod. Second maxilliped without distinguishing characters. Third maxilliped with basal segments approximate or somewhat separated; crista dentata usually well developed; accessory tooth absent; merus usually with 1 or more spines; carpus, propodus and dactyl usually unarmed.
Chelipeds equal, subequal or unequal, with left considerably larger than right; similar or dissimilar in armament; claws corneous, fingers opening in horizontal or oblique plane. Fourth pereopods subchelate or weakly semichelate, with or without preungual process developed at base of claw. Fifth pereopods chelate.Males with paired gonopores; first and second pleonal somites each with pair of pleopods modified as gonopods; unpaired, unequally biramous left pleopods on pleomeres 3–4, pleopod 5 with external ramus well developed, internal ramus rudimentary. Females with paired gonopores; first pleonal somite with pair of modified pleopods; following 3 pleomeres with unequally biramous left pleopods; fifth pleopod as in male; brood pouch usually well developed, occasionally entirely absent.Uropods asymmetrical. Telson with lateral incisions; posterior portion divided by median cleft into 2 subequal to markedly unequal lobes.Remarks.Thomson (1899)
established the genus
Stratiotes
for
Pagurus setosusFilhol 1885
, and mentioned that it appeared to be allied to
Diogenes
because of the unequal chelipeds (left much larger than right) but differed in the absence of the intercalary rostral process.
Forest and McLaughlin (2000)
discussed the status of
Stratiotes
and mentioned the opinions on this genus expressed by several authors such as
Alcock (1905)
and
Thompson (1930)
. As the gill number was not examined, these authors were not aware that the
type
species,
Stratiotes setosus
,
which is in fact synonymous with
Paguristes setosus
,
had only 12 pairs of gills (absence of the pleurobranch on the fifth and eighth thoracic somites). For more than a century the genus
Stratiotes
was considered a junior synonym of
Paguristes
. Now that it has been confirmed that
Paguristes setosus
(H Milne Edwards)
possesses 12 pairs of gills, the genus
Stratiotes
is reinstated.
Among the species included in the genus
Paguristess.l
in the collection of the Muséum national d’Histoire naturelle, 13 species have been found to have 12 pairs of gills. Therefore, they are transferred, herein, to the genus
Stratiotes
(
Table 1
).
TABLE 1.
The species of
Paguristessensu lato
transferred to
Stratiotes
.