The talitrid amphipod genus Talorchestia from the South China Sea to the Indonesian Archipelago (Crustacea, Senticaudata)
Author
Azman, B. A. R.
text
Zootaxa
2017
2017-09-13
4319
3
401
434
journal article
32118
10.11646/zootaxa.4319.3.1
4b84979a-e3de-4956-b9c7-91e178dd46b1
1175-5326
892245
67558747-9346-4561-8Ca5-Fb15Cdc7840B
Talorchestia
sp.
Talorchestia martensii
.—Lyla, Velvihi &
Ajmal Khan, 1998
: 16
, fig. 21.
Habitat.
Estuarine (banks of marine zone) living below stranded algae and rotten pieces of wood (
Lyla
et al
. 1998
).
Description.
Based on Lyla, Velvihi &
Ajmal Khan (1998)
: 16, fig. 21.
Head.
Antenna 2
peduncular articles without marginal row of robust setae; article 3
without ventral plate or process
.
Pereon.
Gnathopod 1
coxa smaller than coxa 2; carpus longer than propodus; posterior margin of carpus and propodus with palmate lobes; anterior margin of propodus with 5 groups of robust setae.
Pleon.
Epimera
without slits above the ventral margins
.
Epimeron 3
with a small posteroventral tooth.
Uropods 1–2
rami without apical spear-shaped setae
.
Uropod 1
peduncle with about 10 robust setae, distolateral robust seta small (less than 1/4 length of outer ramus); inner ramus subequal in length to outer ramus,
with marginal robust setae in 1 row
;
outer ramus without marginal robust setae
.
Uropod 2
peduncle with 3–6 robust setae;
inner ramus
subequal in length to outer ramus,
with 3–6 marginal robust setae in 2 rows
; outer ramus with 3 marginal robust setae.
Uropod 3
peduncle with 1 robust seta
;
ramus subequal to peduncle
, not fused to peduncle, linear (narrowing), with about 6 marginal robust setae.
Telson
longer than broad
;
apically incised
; dorsal midline vestigial or absent,
with 7 setae per lobe
.
Remarks.
The identification of this taxon to the genus
Talorchestia
is problematic.
Lyla
et al
. (1998)
apparently had no males in their collection so the male secondary sexual characters, including the second gnathopod are not known. The left mandible and the maxilliped, all important characters for generic level identification, are also not known. Based on the above non-sexually dimorphic bolded characters the taxon appears to be in the genus
Talorchestia
.
Lyla
et al
. (1998)
identified their specimen, from eastern India, as
Talorchestia martensii
(
Weber, 1892
)
. Their illustrated specimen differs from
T. martensii
of Miyamoto & Morino (1998) in the posteroventral corner of epimeron 3 which has a small subacute tooth.
The importance of the
Lyla
et al
. (1998)
record is that it establishes
Talorchestia
in India for the first time.
Distribution.
India
. Parangipettai coast, Eastern
India
(
Lyla
et al
. 1998
).