Cochinorchestia notabilis ( K.H. Barnard, 1935 )

Lowry, J. K. & Springthorpe, R. T., 2015, Coastal Talitridae (Amphipoda: Talitroidea) from north-western Australia to Darwin with a revision of the genus Cochinorchestia Lowry & Peart, 2010, Zootaxa 3985 (2), pp. 151-202 : 172-173

Cochinorchestia notabilis ( K.H. Barnard, 1935)

( Fig. 13 )

Parorchestia notabilis K.H. Barnard, 1935: 290 , fig. 8. Microrchestia notabilis .— Bousfield, 1984: 203, table 5. Cochinorchestia notabilis .— Lowry & Peart, 2010: 21.

Not Orchestia notabilis .— Griffiths, 1973: 300, fig. 11 (= C. morrumbene sp. nov. from Mozambique).— Griffiths, 1976: 79 (key), 80, fig. 52a, 103, Appendix 1 (Checklist).

Not Orchestia notabilis .— Ledoyer, 1986: 1010, fig. 399 (= C. tulear sp. nov. from Madagascar).

Types. Syntypes: 30 males, 42 females (ovigerous), 7 juveniles, IM, under rotten Pandanus, Vypin , Cochin State, India (~ 10°4.4'N 76°12.4'E), coll. H.S. Rao, January 1928; 6 males, 11 females, IM, Cheppanam, Cochin State, India (~ 9°54'N 76°20.2'E), H.S. Rao, January 1928; 4 males, 4 females (ovigerous), IM, Cheriya, Kadamakudi, Cochin State, India (~ 10°2.6'N 76°15.2'E), H.S. Rao, January 1928.

Type locality. Vypin, Cochin State, India (~ 10°4.4'N 76°12.4'E), Cheppanam, Cochin State, India (~ 9°54'N 76°20.2'E); Cheriya, Kadamakudi, Cochin State, India (~ 10°2.6'N 76°15.2'E).

Habitat. Supralittoral, under rotten Pandanus .

Desription. Based on male ( K.H. Barnard 1935: 290, fig. 8).

Head slender scales on ventroproximal surface unknown. Antenna 1 reaching beyond end of antenna 2 peduncle. Antenna 2 less than half body length. Mouthparts unknown.

Pereon. Gnathopod 1 subchelate; posterior margin of merus, carpus and propodus each with lobe covered in palmate setae; carpus longer than propodus, 1.4 × as long as propodus, 2.3 × as long as broad; propodus 'subtriangular', anterior margin with 1 group of robust setae, palm transverse; dactylus subequal in length to palm. Gnathopod 2 sexually dimorphic; subchelate; basis slightly expanded; ischium with rounded lobe on mid-anterior margin, ischium without anterodistal lobe on medial surface; carpus reduced (not enclosed by merus and propodus), posterior lobe absent, not projecting between merus and propodus; propodus subovate, 2.5 × as long as wide; palm extremely acute, reaching about 75% along posterior margin, strongly toothed, incised, with weakly bimodal distal shelf, tooth, large sinus, smaller tooth and broad smooth gap, lined with robust setae (5 proximolateral), with cuticular patch at corner of palm unknown; dactylus subequal in length to palm, sinusoidal, without anteroproximal bump, posterior margin smooth, not modified distally, blunt.

Pleon. Uropod 3 peduncle with 1 robust seta; ramus not fused to peduncle; ramus shorter than peduncle, with 4–5 apical setae. Telson with 2–3 apical robust setae per lobe.

Remarks. Based on the original description C. notabilis is not in Microrchestia because uropod 1 has robust setae on the outer ramus. The original description of this species is not good. It is most important to redescribe this species based new collections from the type locality.

Based on what we know about C. notabilis it belongs in the species group with C. lindsayae and C. morrumbene . Cochinorchestia notabilis has similar male second gnathopods to C. morrumbene but in C. notabilis the palmar teeth are subacute (rounded in C. morrumbene ) and the shallow proximal sinus is significantly broader. The male second gnathopod of C. notabilis is more similar to C. lindsayae , but the distal shelf is bimodal (straight in C. lindsayae ) and the proximal gap in the sinus is significantly wider.

Distribution. India. Cochin State ( K.H. Barnard 1935).

Figures

FIGURE 13. Cochinorchestia notabilis (K. H. Barnard, 1935), male, syntype; female, syntype, Cochin, India (After K. H. Barnard, 1935: 290, fig. 8).