Doieolamprops confundus, Gerken, 2018

Gerken, Sarah, 2018, The Lampropidae (Crustacea: Cumacea) of the World, Zootaxa 4428 (1), pp. 1-192 : 49-52

Doieolamprops confundus n. sp.

( Figs 14–15 )

Type material. Holotype: subadult female, AM P66461, 33°42’S, 151°54’E, 466 m, north-east of Long Reef , New South Wales, Australia, collected by FRV “Kapala” 19 December 1985.

Description. Holotype subadult female, AM P66461, 4.9 mm.

Carapace unornamentaed; pseudorostral lobes 0.3 carapace length; eyelobe absent; carapace 2.2 length of pereonites together ( Fig. 14A ).

Antennule peduncle article 1 equal to articles 2 and 3 together, with 3 simple setae; article 2 0.6 article 1 length, with 3 simple setae; article 3 0.6 article 2 length, with simple seta; main flagellum of 3 articles, 2.1 length of article 3, with 2 aesthetascs; accessory flagellum of 3 articles, equal to main flagellum length, with 6 simple setae ( Fig. 14B ).

Antenna, mandible not figured.

Maxillule with 2 endites; outer endite with 1 microserrate and 11 simple setae; inner endite with 1 simple, 1 dentate and 2 pappose setae; palp with 2 setae ( Fig. 14C ).

Maxilla with 3 endites; broad endite distal margin with pappose and simple setae, medial row of 2 setae, medial margin with 2 simple setae; medial narrow endite with 4 microserrate setae terminally; distal narrow endite with 5 microserrate setae terminally; both narrow endites extending to distal margin of broad endite ( Fig. 14D ).

Maxilliped 1 basis produced medially as broad lobe, distal margin with 5 simple setae, 2 hook setae medially, with row of 7 pappose setae; ischium absent; merus with pappose seta laterally; carpus 2.1 merus length, with 4 simple, 1 pappose and 5 comb setae medially, pappose seta laterally; propodus 0.6 carpus length, with 4 simple and 2 pappose setae; dactylus 0.4 propodus length, with 4 simple setae ( Fig. 14E ).

Maxilliped 2 basis broken, with 3 plumose setae distally; ischium unarmed; merus 7.5 ischium length, with 2 pappose setae medially, pappose seta laterally; carpus 2.1 merus length, with 4 simple setae medially, pappose seta laterally; propodus 0.8 carpus length, with 2 simple, 1 plumose and 3 pappose setae; dactylus 0.7 propodus length, with 2 simple setae ( Fig. 14F ).

Maxilliped 3 basis 1.2 all other articles together, with 2 pappose setae; ischium 0.04 basis length, unarmed; merus 3.3 ischium length, with 3 pappose setae; carpus 2.9 merus length, with 1 simple and 5 plumose setae; propodus 0.4 carpus length, with 4 simple and 2 plumose setae; dactylus 0.5 propodus length, with 2 simple setae terminally; exopod equal to basis length, basal article unarmed, flagellum with plumo-annulate setae ( Fig. 14G ).

Pereopod 1 basis equal to all other articles together, with 3 simple and 1 plumose setae; ischium 0.04 basis length, unarmed; merus 4.3 ischium length, with 2 simple setae; carpus 1.7 merus length, with 5 simple and 1 microserrate setae; propodus 0.9 carpus length, with 3 simple and 1 microserrate setae; dactylus 0.7 propodus length, with 3 microserrate setae and 3 microserrate setae terminally; exopod 0.9 basis length, basal article unarmed, flagellum with plumo-annulate setae ( Fig. 15A ).

Pereopod 2 basis equal to all other articles together, with 2 simple and 1 plumose setae; ischium 0.07 basis length, with simple seta; merus 2.0 ischium length, with simple seta; carpus 3.0 merus length, with 3 microserrate setae; propodus 0.2 carpus length, with microserrate seta; dactylus 3.1 propodus length, with 3 simple setae and 3 simple setae terminally; exopod rudimentary, 0.2 basis length, of 2 articles with 2 simple setae ( Fig. 15B ).

Pereopod 3 basis 1.7 all other articles together, with 3 simple setae; ischium 0.6 basis length, with simple seta; merus 2.0 ischium length, with simple seta; carpus 1.8 merus length, with 2 simple setae; propodus 0.6 carpus length, with simple seta; dactylus 0.4 propodus length, with 2 simple setae terminally; exopod rudimentary, 0.1 basis length, of 2 articles with 2 simple setae ( Fig. 15C ).

Pereopod 4 basis 1.1 all other articles together, with 3 simple and 1 pedunculate setae; ischium 0.06 basis length, with simple seta; merus 3.3 ischium length, with simple seta; carpus 1.9 merus length, with simple seta; propodus 0.6 carpus length, with simple seta; dactylus 0.3 propodus length, with 3 simple setae terminally; exopod rudimentary, 0.2 basis length, of 2 articles with 3 simple setae ( Fig. 15D ).

Pereopod 5 basis 0.7 all other articles together, with simple seta; ischium 0.1 basis length, with simple seta; merus 2.3 ischium length, with simple seta; carpus 2.6 merus length, with simple seta; propodus 0.4 carpus length, with simple seta; dactylus 2.7 propodus length, with 2 simple setae terminally ( Fig. 15E ).

Telson 1.8 length of pleonite 6, without lateral setae, lateral margins serrate distally, 3 short terminal setae ( Fig. 15F ).

Uropod peduncles 2.8 pleonite 6 length, 1.6 telson length, medial margins serrate. Uropod endopod of 2 articles, equal to peduncle length; article 1 1.5 article 2 length, unarmed, medial margin serrate; article 2 0.7 article 1 length, medial margin serrate, terminal seta simple, 0.25 article 2 length. Uropod exopod equal to length of endopod; article 1 0.2 length of article 2, unarmed; article 2 5.1 article 1 length, with 2–3 simple setae, terminal seta broken ( Fig. 15F ).

Etymology. Confundus, because of the confusing nature of the species, as it has characteristics similar to both Platysympus and Archaeocuma , as well as a mixture of female and male characteristics.

Depth. 466 m.

Distribution. New South Wales, Australia, 33°42’S, 151°54’E.

Remarks. The specimen described here is immature, and not pre–ovigerous, as there are no brood plates visible. However, the exopods on maxilliped 3 and pereopod 1 are fully developed while the pereopod 2 exopod is distinctly not developed and resembles the rudimentary exopods recorded for Platysympus , in which the exopod is reduced to 2 small articles with a few short setae terminally. The pereopod 3 and pereopod 4 exopods are rudimentary. The antenna was rudimentary and very small, showing no indication of the enlargement that would be expected in an immature male. With the combination of the exopod pattern being similar to that seen in Platysympus females and the lack of any development of the antenna, this specimen is not an immature male.

Figures

FIGURE 14. Doeiolamprops confundus n. sp. Holotype subadult female AM P66461 A, side view; B, antennule; C, maxilluled; D, maxilla; E, maxilliped 1; F, maxilliped 2; G, maxilliped 3. Scale bars full body 1.0 mm, all others 0.1 mm.

FIGURE 15. Doeiolamprops confundus n. sp. Holotype subadult female AM P66461 A, pereopod 1; B, pereopod 2; C, pereopod 3; D, pereopod 4; E, pereopod 5; F, telson and uropods. Scale bars 0.1 mm.